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IM 613-1: Unit Vent MicroTech Controller - 348KB

1. Installation amp Maintenance Data wen Group Unit Ventilator Part No 106102101 Date July 1999 MicroTech Unit Ventilator C ontroller MIS ANON EC HE CA jaa a 12344 t5 35531 c sje sje ale sja aja aja i i hoc DON A DUGITAL D d ul EA iN T ELS SIN SIN LIN ji d A 13 A A an d Kaff COOLING Se TT IS H LO E FACTCETY SET GOT ANDWE Lier e HE TWORHEK 1 HEA Toe SETPTHHT epee na ema ma GA UNOCCUPIED HEATING SETPOINT D HGSETICHM OFFSET u Ede 325 e MicroTech RS ck bi Es 325 Controller SN 11882 Tha denice pnma and Erat 5 nfl ine PEE r rs Urs en rt Gen bo tee iis 2 cores WT jews qur nci ae Saeed eA p Tha dance ms trpi bip eS ed reii r hs Iud mas CSR unam operon I z PART HU 107027201 Jb F z Ser T AT E E en RELAY OUT ALE QUT STATUS POWER PHR IG Hi 34 5 6 Ce vo S i NI LT e epp ke 7 al b LEN ECKER Used with AAF HermanNelson Models AVS AVV AVR AHF AHV AHR AED AEQ AZS AZQ AZR ARQ ERQ e e Herma nNelson 1999 AAF HermanNelson Introduction er uc eles STEINS ELTER en 3 General Description 4 Component Data 4 Microprocessor 5 Setpoint Adjustment Potentiometers 5 e EEN EE 5 Power PED d Ee E ttu nsa 5 Hex Switches volu wee Ee 5 Communication Ports 6 Temperature Sensors 6 e Ee 6 Standard Control Features 6 Control Temperature 6 Change
2. 1 Determine the sensor s analog input number Refer to the unit wiring diagram or to the input output tables Tables 11 through 17 2 Remove the IDC connector from its UVC terminals and measure the resistance of the sensor through the IDC connection Compare this value to the acceptable range of values listed in the thermistor chart Table 18 If the measured resistance is within the acceptable range of values go on to step 3 If the measured resistance is higher or lower than any chart value either there is a wiring problem or the sensor is defective Check the IDC connection and the sensor circuit wiring for defects 3 Replace the connector and measure the DC voltage across the sensor terminals If the reading is between 0 39 VDC 4 and 4 88 VDC 496 the measured voltage is acceptable Attempt to clear the fault by cycling power to the UVC If the fault does not clear the UVC may require factory service or it may be defective If the reading is less than 0 39 VDC 4 or greater than 4 88 VDC 495 the UVC is defective this assumes sensor and circuit are intact Digital Input Faults The four possible digital input faults are triggered by either a high pressure or low temperature switch They are indicated by a 3 or 5 blink fault code see Table 9 Note that an open switch causes a 3 blink fault code and a closed switch causes a 5 blink fault code Usually a digital input fault is caused by high pressure
3. Figure 4 Digital Input Wiring Example Relay Outputs The UVC has eight relay outputs These outputs are internally connected to the normally open contacts of eight on board electromechanical relays The outputs are labeled RELAY OUTPUT on the UVC and RO 1 through RO 8 on the unit wiring diagram Each output has two terminals a numeric terminal and a common RO H hot terminal see Figure 1 The unit ventilator s 24 VAC loads are connected as shown in Figure 5 The loads could be a contactor another relay a solenoid or an actuator s open or close circuits Refer to the wiring diagram supplied with your unit for specific wiring details Input Output Tables All UVC input and output connections and their corresponding unit ventilator components are shown in the following tables The tables are arranged according to UVC program and software model numbers To determine the correct input output information for a particular unit ventilator you must know these numbers Refer to the software ID tag attached to the UVC faceplate or refer to Table 4 IM 613 Page 22 Rev 7 99 Table 11 1 aK Inputs and Outputs for Program UV Units Models AE or AV AH Software Connection Model Component Description Tenant override or remote spt adjust or both optional Room temperature sensor Discharge air temperature sensor Outdoor air temperature sensor Not Used Not Used Outside air damper p
4. 4EPC9175 4EPC9176 4EPC9177 4ELN7604 4ELN9178 4EMB8937 4EZB9324 4EZB9324 MF5513 MF5513 4EGA9159 4EGA9160 4EGA9161 4EGA9162 4EGA9163 57186801 Description MicroTech Unit Ventilator Controller Room temperature sensor unit mounted Room temperature sensor wall mounted Room sensor with tenant override wall mounted Room sensor with remote setpoint adjust wall mounted Room sensor with tenant override amp remote setpoint adjust wall mounted Room temperature sensor with thermometer wall mounted Room sensor with tenant override amp thermometer wall mounted Room sensor with remote setpoint adjust amp thermometer wall mounted Room sensor with tenant override remote setpoint adjust amp thermometer wall mounted Discharge air temperature sensor Outdoor air temperature sensor Mixed air temperature sensor Water in temperature sensor Water out temperature sensor Tenant override switch unit mounted Day night switch Holiday switch Fan relay Transformer 120 24 VAC Transformer 208 230 460 24 VAC Transformer 277 24 VAC Transformer 120 24 VAC Transformer 208 230 24 VAC Transformer 277 460 24 VAC Low temperature switch DX coil Low temperature switch hydronic coil High pressure switch Damper actuator outdoor air Damper actuator face and bypass Valve actuator heatin
5. The status LED should illuminate after calibration If a wall sensor package is used the remote status LED should also illuminate Verify that the slave s status LED indication matches the master s indication regardless of the operating mode If the status LED is flashing in a 16 blink sequence the slave is not communicating with its master Refer to Test Procedures in the Service Information section of this manual 9 Check for proper voltage levels at the Comm B port Use a DC voltmeter to test the voltage levels at the Comm B terminals with respect to ground The terminals and accept able voltage ranges are specified in Table 8 If the voltage levels are acceptable go on to step 6 If no voltage or improper voltage levels are found the UVC is defective and must be replaced Check for proper voltage levels at the communication port IDC connector Use a DC voltmeter to test the voltage levels at the connector terminals with respect to ground Test at the connector terminals corresponding to the communication port terminals listed in Table 8 Verify that the voltages are within the ranges specified in the table If the voltage levels are acceptable connect the IDC connector to the Comm B port If no voltage or improper voltage levels are found verify that the master UVC is energized and that the communications trunk wiring is intact Verify that the unit ventilator is operating in accordance with
6. Water In Temperature Sensor Failure fault is applicable to WSHP units and to units equipped with water coils except for 4 pipe valve controlled units It will occur when the voltage across the entering water temperature sensor is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting sensor faults Note Except for 2 pipe units this fault will not affect the normal operation of units equipped with water coils Effects as applicable to WSHP units Economizer changeover function depends on OA temperature only entering water temperature is assumed to be high Compressorized heating is available entering water temperature is assumed to be high Electric heat can be enabled by the emergency heat or discharge air low limit functions only entering water temperature is assumed to be high Effects as applicable to 2 pipe units Valve or face and bypass damper cooling operation is disabled entering water temperature is assumed to be high EOC valve will act as a heating EOC valve entering water temperature is assumed to be high Water Out Temperature Sensor Failure The Water Out Temperature Sensor Failure fault will occur when the voltage across the leaving water temperature sensor is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshoot
7. slave and its master fails the slave UVC will indicate the alarm and continue to operate using the temperature and minimum position setpoints defined by its on board potentiometers Its operating mode will be that last received from its master or if power is cycled it will default to occupied MicroTech Network A variety of MicroTech unit and auxiliary controllers can be interconnected to form a MicroTech network A MicroTech network provides a building operator with the capability to perform advanced equipment control and monitoring from a central or remote location A network UVC is a controller that has been programmed with the software required to operate in a Micro Tech network The following features are provided for each network UVC over the MicroTech network Day night changeover scheduling Heating and cooling setpoint adjustment Minimum OA damper position setpoint adjustment Ventilation lockout Change filter alarm Demand limiting Communication Failure If the MicroTech network communica tion link failures for any reason the affected UVC will remain operational Its operating mode will be that last received over the network or if power is cycled it will default to occupied Its mini mum position heating and cooling setpoints will be those last received over the network regardless of whether power is cycled ASHRAE Cycle All unit ventilator controllers are factory programmed to follow ASHRAE II unit ve
8. 0 20 oF 60 80 MINIMUM OA UNOCCUPIED HEATING SETPOINT POSITION OFFSET Unoccupied Offset Pot A MicroTech SERIAL EOS S N tag EOS 325 Controller Heating Setpoint Pot This device complies with part 15 of the FCC rules Operation is subject to the following 2 conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation Software ID tag PART NO 107627201 J6 w J7 e J e J e LED RELAY OUT AUX OUT PWR GO H12345678 V 9 10 STATUS POWER G 24V Electro Mechanical C Relays STATUS POWER o BE RE o GEB Lo Remote Status H LED Output Auxiliary Status LED Power Supply LED Relay Outputs Outputs TRIAC IM 613 Page 4 Rev 7 99 Microprocessor The UVC contains a microprocessor that is preprogrammed with the software required to monitor and control the unit It receives input data from as many as 20 inputs analog or digital and sends commands to as many as 8 outputs electromechanical relays There are 2 additional solid state relay aux outputs which are not used for standard unit ventilator configurations The quantities and types of inputs and outputs are dependent on the unit venti lator model type and configuration options All input and output connections to the UVC are made using insulation displacement type IDC terminal connectors The UVC uses field adjustable setpoints and fi
9. Address 00 FF may be used On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it Enter the following string of memory addresses into the Memory Address box exactly as shown then press the IM 613 Page 30 Rev 7 99 10 11 12 13 14 15 16 Enter key 0212 0217 0A01 0A02 0204 0505 0507 0901 0902 091A 091B 0935 0936 Notice in the Read Write area that the values located in 0A01 and 0A02 are identical Write to 0A01 by clicking on the value and change it to any value other than the value at 0A02 Write a value of 4 to location 0204 This will reset the controller The program will stop all outputs will go off Write 255 to location 0216 this will return a value of 1 This will begin forcing the valve closed Watch memory location 0505 change when this value stops changing the valve is fully closed On a sheet of paper write this value down for later use Write a 0 to location 0216 Then write a 255 to location 0217 this will return a value of 1 This will begin forcing the valve opened Watch memory location 0505 change when this value stops changing the valve is fully opened On a sheet of paper write this value down for later use Write a 0 to location 0217 Using the Read Write screen write the lowest value of the two numbers you wrote down on the sheet of paper to location 0935 then w
10. In the Windows Monitor program secure the correct Master Slave software then go to the Support menu and choose Read Write On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter key 8011 8012 8001 8002 0911 0204 Write a value of 73 to location 8011 by clicking on the current value Write a value equal to the number of slaves you will have into location 8012 by clicking on the current value of 8012 This value must be 1 through 5 as the minimum number of slaves is 1 and the maximum is 5 Write a value of 0 to location 0911 by clicking on the cur rent value Write a value of 4 to location 0204 to reset the controller Change location 8001 to equal location 8002 if there is a difference If no difference go to the next step Change the Master UVC Hex switches to 01 Write a value of 4 to location 0204 to again reset the controller Master configuration is complete At this point you will lose communications with the Master UVC through Port A on the Master If you need to commu nicate with the Master UVC the recommended method is to connect to one of the Slave UVC s Port A and set the network address within the Monitor program to 01 00 IM 613 Page 14 Rev 7 99 Initial Slave Configurat
11. Outdoor Air Temperature Sensor Failure Software Mixed Air Temperature Sensor Failure Software Outside Range 0 39 to 4 88 VDC 4 Outside Range 0 39 to 4 88 VDC 4 Auto Water In Temperature Sensor Failure Software Outside Range 0 39 to 4 88 VDC 4 Auto Change Filter Network Units Only Software Fan Runtime Setpoint Adj Network Communication Error Master Slave Only Software o Alarm is available for this unit Alarm may be available depending on unit configuration IM 613 Page 18 Rev 7 99 N A Auto An auto reset fault will immediately clear whenever the alarm conditions that caused it disappear A manual reset fault can be cleared by cycling power to the con troller Note The cause of a manual reset fault should be investigated and eliminated before the unit is placed back into service Alarm Descriptions Following are descriptions of the various faults listed in Table 9 Note that some alarms are present only on certain unit ventilator model types and configurations 2 Pipe Units Only All references to heating or cooling valves modulating or EOC in the Effects sections below also apply to 2 pipe units Whether the 2 pipe valve is a heating or cooling valve is determined by the entering water temperature The changeover setpoint is 80 F default Room Temperature Sensor Failure The Room Temperature Sensor Failure fault will occur when the voltage
12. R1 on AZ R7 on AV AH Not used Not used Not used Not used Low water coil temp switch T6 Outside air damper open Not used Fan relay R4 Not used Outside air damper close Heating valve close extend F amp BP damper close to face extend Not used Heating valve open retract Heat cool valve close extend F amp BP damper open to face retract Not used Not used Not used Heating EOC valve close 2 position N O Not used Exhaust fan relay or auxilliary heat relay Heat cool valve open retract Not used Notes Outside air damper open 1 Switch T6 is not installed on units with steam coils These Outside air damper close units are wired to provide a constant no fault condition Heating valve close extend 2 High pressure switch HP is not installed on AV AH units FEBR damper RSS toiface SKI Only low temperature switch T4 is connected to DI 14 Not used on these units F amp BP damper close to face extend 1 Heati I tract 3 High pressure switch HP and low temperature switch eal ee open retract T4 are wired in series on AZ units only F amp BP damper open to face retract Not used F amp BP damper open to face retract Not used Heating EOC valve close 2 postition N O Not used Heat cool EOC valve close 2 postition N O Exhaust fan relay
13. Thermistor Chart 26 Introduction This manual provides information pertaining to the in conjunction with the separate installation Bulletin MicroTech Unit Ventilator Controller UVC as applied in the No OM101 through OM107 and sequence of operation AAF HermanNelson Unit Ventilator product line It should be used literature see Tables 5 and 6 A CAUTION This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications It has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential environment AAF HermanNelson disclaims any liability resulting from any interference or for the correction thereof A CAUTION This MicroTech controller contains static electricity sensitive components A static discharge while handling electronic circuit boards may cause damage to the components To prevent such damage during service involving board replacement discharge any static charge by touching grounded bare metal inside the unit before performing any service work WARNING If the unit ventilator is to be used for temporary heating or cooling the unit must first be properly commissioned Failure to comply with this requiremen
14. across the sensor is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting sensor faults Effects as applicable Fan is immediately de energized Compressor is immediately de energized Reversing valve is de energized after a delay Outside air damper is closed All electric heat stages are de energized Face and bypass damper is positioned to 100 face Heating valve is fully opened to the coil Chilled water valve is closed to the coil Heating EOC valve is opened Cooling EOC valve is closed High Pressure The High Pressure fault is an indication that the high pressure switch input DI 4 sensed an open circuit while the controller was calling for the compressor to run The high pressure switch HP is wired in series with the compressor relay output RO 2 the compressor relay coil R1 and the UVC alarm input Therefore if a high pressure condition occurs the compressor will be immediately shut down by the switch then it will be disabled by the UVC Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults AV AH Units Only Because compressorized AV or AH models are split systems a factory mounted high pressure switch is not possible and the high pressure fault is not available On some of these models DI 4 is directly connected
15. and Step amp Wait Algorithms 6 Compressor Short Cycle Protection 7 Low Ambient Lockout 00 0 0005 7 Random Start 22 o vb VERDI Pe bat Neser 7 Delayed Reversing Valve De energization 7 Emergency Heat 7 Defrost ergeet dE R eke eu ee a 7 Alarm Monitoring amp Controlled Response 7 Factory Configured Options 8 Communication Type 000 e eee eee eee 8 ASHRAE Cycle 9 Room Temperature Sensor 9 Remote Room Setpoint Adjustment 9 Tenant Override 9 Day Night Changeover lesus 9 Ventilation Lockout 0 200002 ee eee 9 Exhaust Fan Interlock 9 Figures 1 MicroTech Unit Ventilator Controller 4 2 Hex Switches iussi RW he dee SA ed 5 3 Software ID Tagn eee 10 4 Digital Input Wiring Example 22 5 Relay Output Wiring Example 22 6 Barber Colman Actuator Position Feedback Voltages 28 IM 613 Page 2 Rev 7 99 Table of C ontents List of Illustrations Software D EN EENS EINEN I mn 10 Commissioning esee 11 PreSt rt i i eet e aa exten die w hee uid riter 11 Required Tools and Literature 11 Unit Ventilator Identification 11 Field Wiring Check 11 Setpoint Initialization 12 Start Up usn E ed xxr xS 13 Stand alone 13 Master Slave seii ern Siege eea
16. at the units in accordance with the field wiring diagram 4 At the UVC board verify that the IDC connectors are disconnected from the Comm A and Comm B ports They will be connected during the start up process 5 460V Type AE amp AZ Only Check that 600 volt rated cable has been used 6 M MicroTech Network Units Only Check that the conduc tors have been terminated at the Local Master Controller LMC in accordance with the field wiring diagram supplied with the LMC Check that the cable length between the LMC and the farthest UVC does not exceed 5000 feet Day Night Changeover Stand alone or Master Units 1 Check that the conductors have been terminated at the unit in accordance with the field wiring diagram Note Field terminations are not required for the factory mounted time clock and manual switch options 2 Check that the ultimate changeover device provides the proper action at the UVC The dry contacts connected to DI 2 must be open for occupied and closed for unoccupied If used the factory installed relay is wired so that it must be de energized for occupied and energized for unoccupied 3 460V Type AE amp AZ Only Check that 600 volt rated conductors have been used Ventilation Lockout Stand alone Master or Slave Units 1 Check that the conductors have been terminated at the unit in accordance with the field wiring diagram 2 Check that the field supplied device energizes t
17. closed exhaust fan interlock feature is overridden Heating valve is positioned to 10096 open to the coil discharge air temperature 55 F default Heating valve is positioned 2596 open to the coil discharge air temperature gt 55 F default Chilled water valve is closed to the coil Compressor is immediately de energized First stage of electric heat is energized only if fan is on IM 613 Page 19 Rev 7 99 Brownout The Brownout fault indicates that the UVC is sensing low voltage levels It is a safety that is intended to protect the compressor and electric heat contactors from low line voltage or brownout conditions The controller is programmed with a brownout setpoint that corresponds to 85 of the unit ventilator s nameplate line voltage value If the UVC senses a voltage level less than its setpoint for more than 10 seconds 2 seconds with electric heat it will trigger the brownout fault The fault will reset when the sensed voltage remains at or above a level corresponding to 90 of the nameplate value for a period of 5 minutes For information on troubleshooting this alarm refer to Test Procedures in the Service Information section of this manual Effects as applicable Compressor is immediately de energized All electric heat stages are immediately de energized Heating Valve Position Feedback Failure 4 Pipe Units Only The Heating Valve Position Feedback Failure fault
18. eie e ii eee 13 Network iue m wee eee eae a 16 Diagnostics amp Service 18 Alarm Monitoring amp Control 18 Fault Code Interpretation 18 Clearing Faute 18 Alarm Descriptions 0 000 ee eee eee 19 Service Information 0 00 e cece eee eee 21 PC Connection iec sesend aaniu eee eee eee 21 UVC Inputs and Outputs 21 Test Procedures 26 UVC Replacement 28 Valve amp Damper Actuator Calibration Procedures 29 PartsList ee de seek eke eee e 31 Tables 1 Status LED Indication 5 2 Hexadecimal to Decimal Conversion Guide 5 3 Alarm amp Controlled Response Feature Availability 7 4 Programs and Software Models 10 5 Model Specific Unit Ventilator Installation Literature 11 6 Program Specific Sequence of Operation Literature 11 7 Network UVC Default Setpoints 12 8 Network Communications Port Terminal Voltage Ranges 13 9 Alarm and Fault Code Summary 18 10 RS 232 Communications Cable Terminations 21 11 Inputs and Outputs for Program UV1 Units 22 12 Inputs and Outputs for Program UV2 Units 23 13 Inputs and Outputs for Program UV3 Units 23 14 Inputs and Outputs for Program UV4 Units 24 15 Inputs and Outputs for Program UV5 Units 24 16 Inputs and Outputs for Program UV6 Units 25 17 Inputs and Outputs for Program UV7 Units 25 18
19. heating or night setback and unoccupied cooling or night setup setpoints The night setback setpoint is calculated by subtracting the offset value from the occupied heating setpoint The night setup setpoint is calculated by adding the offset value to the occupied cooling setpoint Status LED An amber on board status LED aids in diagnostics by indicating the unit ventilator operating mode and alarm conditions If there are no current alarm conditions the LED will indicate the unit operating mode as shown in Table 1 If there are one or more alarm condi tions present the LED will flash in a specific sequence to indi cate a particular alarm condition For more information on alarms refer to the Alarm Monitoring amp Control section of this manual A remote status LED is provided with all optional wall mounted temperature sensor packages It has the same function as the Table 1 Status LED Indication Status LED State On Continually On l sec Off 5 sec On 5 4 sec Off sec Flashing Indication Occupied Mode Unoccupied Mode Tenant Override Mode Alarm Condition On 3 sec off 3 sec Calibration Referto Table 9 in the Alarm Monitoring amp Control section of this manual Calibration of OA Damper F amp BP Damper and or valve actuators will be completed within approximately 5 min after power on on board status LED If used the remote LED is connected to the UV
20. is an indication that the UVC is sensing a valve position feedback voltage that is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting actuator feedback faults Effect Heating valve will hold its position Valve or Face and Bypass Damper Position Feedback Failure The Valve or F amp BP Damper Position Feedback Failure fault is an indication that the UVC is sensing a valve or F amp BP damper position feedback voltage that is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting actuator feedback faults On 4 pipe valve controlled units this fault applies to the chilled water valve On all other units with control valves or F amp BP dampers there is only one possibility heating valve chilled water valve or F amp BP damper actuator Effect Valve or actuator will hold its position Outdoor Air Damper Position Feedback Failure The Outdoor Air Damper Position Feedback Failure fault is an indication that the UVC is sensing a damper position feedback voltage that is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting actuator feedback faults Effect Outdoor air damper will hold its position Discharge Air Temperature Sensor Failure The Discharge Air Te
21. or auxilliary heat relay Notes 1 Switch T6 is not installed on heating only units with steam coils Unit is wired to provide a constant no fault condition IM 613 Page 24 Rev 7 99 Table 16 Inputs and Outputs for Program UV Units Models AV AH 4 pipe Software c D ipti Model omponent Description Tenant override or remote spt adjust or both optional Room temperature sensor Discharge air temperature sensor Outdoor air temperature sensor Heating valve position Hot Water in temperature sensor Chilled water valve position F amp BP damper position Outside air damper position Day night changeover device optional Ventilation default lockout or exhaust fan interlock optional MDL13 Low water coil temp switch T6 MDL14 Not used RO 1 Al Fan relay R4 MDL13 Chilled water valve open extend MDL14 Chilled water EOC valve open 2 position N C MDL13 Chilled water valve close retract MDL14 Not used RO 4 All Outside air damper open DI 5 RO 2 RO 3 RO 5 All Outside air damper close MDL13 Heating valve close extend MDL14 F amp BP damper close to face extend MDL13 Heating valve open retract RO 6 RO 7 MDL14 F amp BP damper open to face retract MDL13 Not used MDL14 Heating EOC valve close 2 position N O RO 10 All Exhaust fan relay or auxilliary heat relay RO 8 Table 17 Connection Inputs and Outp
22. or low temperature alarm conditions that are due to mechanical problems in the unit ventilator However this type of fault could also be caused by a problem in the digital input circuit Following is a procedure that may be used to check for prob lems in the digital input circuit If the probable cause of the fault is found using the procedure attempt to clear the fault by cycling power to the UVC If the probable cause of the fault is not found using the procedure assume that mechanical problems exist and have a qualified technician service the unit before attempting to reset the UVC 1 Check the voltage at the secondary of transformer X3 it should be approximately 24 VAC 2 Determine the switch s digital input number Refer to the unit wiring diagram or to the input output tables Tables 11 through 17 3 Check the wiring and connections throughout the digital input circuit 4 Measure the resistance through the switch contacts with at least one wire disconnected The 3 blink switches are normally closed and the 5 blink switches are normally open see Table 9 The alarm conditions that cause these faults should return to normal fairly quickly If the switch is not in its normal position after a reasonable amount of time it is likely that the switch is defective Brownout Fault Alow line voltage condition is indicated by the 6 blink brownout fault code The UVC senses the AC voltage at the POWER inp
23. to change the unit ventilator operating mode from occupied default to unoccupied When the unit is in the unoccupied operating mode the OA damper is closed and the night setback and setup room setpoints are maintained The fan is energized only when heating or cooling is required For further information refer to sequence of operation document provided with your unit Stand alone and Master Units The day night changeover function is provided by a factory installed or field installed device The following changeover options are available Relay 24 VAC coil for field connection Time clock and holiday switch Manual day night switch Pneumatic electric PE switch or relay field supplied amp installed All of the above methods must provide a maintained contact closure at DI 2 to place the UVC into the unoccupied operating mode When the contacts are open or if none are provided the unit will be in the occupied operating mode Network Units The day night changeover function is provided over the Micro Tech network It can be scheduled for every controller on the network using the UVC Monitor program Ventilation Lockout The ventilation lockout option provides a means of overriding normal UVC control and closing the outdoor air damper at any time Stand alone Master and Slave Units When the ventilation lockout option is ordered a relay 24 or 115 VAC is factory installed and wired to the UVC The OA damper w
24. unit is in the emergency heat mode the following actions occur Compressor is immediately de energized and locked out Reversing valve is de energized after a delay Electric heat is staged to maintain the room heating setpoint regardless of outdoor air temperature ASHP units or entering water temperature WSHP units The unit ventilator may be returned to normal operation by cycling power to the controller use fan switch or main power switch ASHP Units Only Note that the emergency heat switch SW5 and defrost control contacts are wired in parallel and use the same UVC digital input DI 3 The emergency heat switch provides a momentary contact closure and the defrost control provides a maintained contact closure Therefore do not hold the emergency heat switch down or the unit may enter the defrost mode instead of the desired emergency heat mode Defrost The AE air source heat pump ASHP unit ventilator models have a defrost cycle which prevents frost from building up on the outdoor coil when the unit is operating in the heating mode An external defrost control provides a maintained contact closure to the UVC when defrost is required When the unit is in the defrost mode the following actions occur Reversing valve is de energized unit enters cooling cycle Electric heat is staged to maintain the room setpoint regardless of outdoor air temperature Compressor cannot be de energized by room temp
25. C at the terminal section labeled LED Power LED The green on board power LED indicates microprocessor on status After applying power to the unit the power LED should illuminate continuously For more information refer to Test Procedures in the Service Information section of this manual Hex Switches The UVC includes two hex hexadecimal switches that may need to be set The HI and LO hex switches are shown in Figures 1 and 2 Table 2 provides a hex to decimal conversion guide Figure 2 Hex Switches A hex switch setting is defined as the HI switch digit followed by the LO switch digit For example a hex switch setting of 2F would have the HI switch set to 2 and the LO switch set to F Stand alone Units On compressor equipped units self contained or split system the hex switch setting defines the random start delay period Each unit on a common circuit or time clock should have a different hex switch setting to ensure that multiple units do not start simultaneously The settings may be between 01 and 3F If the unit ventilator has no compressor leave the hex switch setting at 01 Master Slave and Network Units The hex switch setting defines the controller s network address If the master slave or network unit has a compressor the random start delay is also defined by the hex switch setting For more information on master slave addressing refer to Master Slave in the Start up secti
26. Coil Temperature fault is an indication that the low temperature switch input DI 5 sensed a contact closure while the controller was calling for compressorized cooling UVC s on air Source heat pumps in the defrost cycle will ignore this alarm con dition The low DX coil temperature switch T4 is connected between 24 VAC and the UVC alarm input Switch T4 will close when the coil temperature falls below its setpoint Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults Effect Compressor is immediately de energized Low Water Coil Leaving Air Temperature The Low Water Coil Temperature fault is an indication that the low temperature switch input DI 5 is sensing a contact closure The low water coil temperature fault can occur at any time regardless of the Control Temperature or operating mode The low water coil temperature switch T6 is connected between 24 VAC and the UVC alarm input Switch T6 will close when the coil temperature falls below its setpoint Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults Note On 2 pipe valve controlled units the entering water temperature determines whether the valve will be enabled for heating It must be greater than 80 F default otherwise the valve will be closed Effects as applicable Outdoor air damper is
27. In the Windows Monitor program go to Support menu and choose Read Write 3 Make sure the address located in the Controller Address box is the same as the UV you wish to work on If you are directly connected to the controller you wish to work on and the controller is not a Master in a Master Slave network then the Controller Address 00 FF may be used IM 613 Page 29 Rev 7 99 10 Tis 12 13 14 15 16 On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter key 0212 0217 0A01 0A02 0204 0505 0507 0901 0902 091A 091B 0935 0936 Notice in the Read Write area that the values located in 0A01 and OA02 are identical Write to 0A01 by clicking on the value and change it to any value other than the value at 0A02 Write a value of 4 to location 0204 This will reset the controller The program will stop all outputs will go off Write 255 to location 0212 this will return a value of 1 This will begin forcing the F amp BP damper to the full bypass position or begin closing the valve Watch memory location 0506 change when this value stops changing the damper is in the full bypass position or valve fully closed On a sheet of paper write this value down for later use Write a O to locat
28. Model 10 F amp BP damper Model 12 F amp BP damper Model 14 F amp BP damper and Model 16 F amp BP damper 1 Establish communications to the controller using a PC with the Windows Monitor software and proper cables 2 In the Windows Monitor program go to Support menu and choose Read Write 3 Make sure the address located in the Controller Address box is the same as the UV you wish to work on If you are directly connected to the controller you wish to work on and the controller is not a Master in a Master Slave network then the Controller Address 00 FF may be used 4 On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it 5 Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter key 0212 0217 0A01 0A02 0204 0505 0507 0901 0902 091A 091B 0935 0936 6 Notice in the Read Write area that the values located in 0A01 and 0A02 are identical Write to 0A01 by clicking on the value and change it to any value other than the value at 0A02 7 Write a value of 4 to location 0204 This will reset the controller The program will stop all outputs will go off 8 Write 255 to location 0216 this will return a value of 1 This will begin forcing the F amp BP damper to the full bypass position or begin closing the valve 9 Watch memory location 0506 change whe
29. These actuators are controlled using the Change and Step and Wait control algorithms All cooling valves are normally closed and all heating valves including 2 pipe hot chilled water are normally open Outside air dampers are normally closed and face and bypass F amp BP dampers are normally open to the coil face On some units equipped with F amp BP dampers a spring return two position end of cycle EOC valve is used to pre vent overheating or overcooling when the damper is in the full bypass position Cooling EOC valves are normally closed and heating EOC valves including 2 pipe hot chilled water are nor mally open two stage process to modulate actuators valves or dampers in the unit ventilator This control process enables the UVC to maintain tight space temperature control with no overshoot There are several Change and Step and Wait parameters that are factory set and adjustable only with a PC equipped with Monitor software For most applications the factory set parameters will provide the best control It is recommended that these values not be changed Following is a brief description of the Change and Step and Wait functions For additional information refer to the MicroTech Unit Ventilator Controller Monitor Program User s Manual Change The Change function changes the valve or damper position setpoint in response to the deviation of the room temperature from its setpoint offset The amount of
30. ach unit ventilator If a UVC is defective and must be replaced its unit specific software defined by the above data must be loaded into the replacement controller If a PC is available it may be possible to recover the software from the defective UVC If a PC is not available or the software cannot be recovered the replacement UVC must be downloaded at the factory To do this the factory needs the following information Full model number Serial number e Job control number This information is listed on the unit mounted dataplate It must be included with the replacement UVC part order Valve And Damper Actuator Calibration Procedures Points to keep in mind about actuator calibration Actuator calibration must be performed after every actuator replacement after any linkage adjustment as a service test to verify proper operation when problems are reported if a program has been downloaded to the controller and the previous calibration values were not saved prior to program download If it appears that the controlled device is not working properly use these procedures as a troubleshooting tool to fully activate the controlled device then visually and or mechanically verify proper operation If the software in your MicroTech 325 controller is version 6 or higher UV 6 COD then calibration will be automatically performed after every unit power cycle If your software has the auto calibration feature t
31. actuator position setpoint change varies and is dependent on the amount of room temperature setpoint offset The Change algorithm is executed on a factory set periodic ba sis Step and Wait The Step and Wait function causes the valve or damper to open or close as required to maintain the Change function s calculated position setpoint The step period is the amount of time the electric actuator is driven either open or closed and the wait period is the amount of time the actuator holds its position The step and wait periods vary and are dependent on the amount of actuator position setpoint offset The Step and Wait algorithm is executed on a periodic basis This period is a factory set constant that is equal to the sum of the step and wait periods described above Compressor Short Cycle Protection All compressor equipped unit ventilator models self contained or split system include compressor short cycle protection When a compressor is energized it will remain energized for at least 2 minutes before the temperature control sequence will be allowed to de energize it An alarm condition can override this minimum on timer and stop the compressor if necessary When a compressor is de energized it will remain de energized for at least 3 minutes before the temperature control sequence will be allowed to energize it again Low Ambient Lockout Except for the water source heat pump WSHP models all compres
32. anually Refer to Table 9 Unit Ventilator Model Fault Reset TED TAZS JARQ AVS Factory Setting Clear aEQ AZQ ERQ AVV Outside Range 0 39 to 4 88 VDC 4 Hardware HP High Pressure 2 Auto resets within 7 days then Manual Opens at 400 10 psig Closes at 300 20 psig Low DX Coil Temperature Units with Wet Heat Hardware T4 2 Auto resets within 7 days then Manual Opens at 30 4 F Closes at 50 6 F Hardware T2 Low Refrigerant Temperature Water Coil 2 Auto resets within 7 days then Manual Standard Range Opens at 36 3 F Closes at 46 2 F Extended Range amp Ground Opens at 25 3 F Closes at 35 2 F Hardware T4 Low DX Coil Temperature Units without Wet Heat Closes at 30 4 F Opens at 50 6 F 2 Auto resets within 7 days then Manual Hardware T6 Low Water Coil Leaving Air Temperature Closes at 38 2 F Opens at 45 2 F Auto Brownout Software Line Voltage lt 85 Auto of Nameplate Voltage after 5 min Heating Valve Position Feedback Failure Software Valve or F amp BP Damper Position Feedback Failure Software Outside Range 0 2 0 1 to 3 68 0 29 VDC Auto Outside Range 0 2 0 1 t0 3 68 0 29 VDC OA Damper Position Feedback Failure Software Outside Range 0 2 0 1 to 3 68 0 29 VDC Discharge Air Temperature Sensor Failure Software Outside Range 0 39 to 4 88 VDC 4
33. ator Model Program Model AE AR AV UV1 Configuration AH Description ASHP with Electric Heat UV2 WSHP with Electric Heat WSHP Only DX Cooling with Electric Heat DX Cooling Only Electric Heat Only DX with Wet Heat Valve Control DX with Wet Heat Damper Control Wet Heat Only Valve Control Wet Heat Only Damper Control 2 Pipe Valve Control 2 Pipe Damper Control 4 Pipe Valve Control uve 4 Pipe Damper Control CW Cooling Only Valve Control CW Cooling Only Damper Control CW with Electric Heat Valve Control DX CW Abbreviations ASHP Air source heat pump WSHP Water source heat pump Chilled water IM 613 Page 10 Rev 7 99 Direct expansion refrigerant CW with Electric Heat Damper Control Common hot water and chilled water coil Separate wet heat and chilled water coils 2 Pipe 4 Pipe Wet Heat Steam or hot water heat Commissioning A WARNING ELECTRICAL SHOCK HAZARD Could cause severe injury or death Failure to bond the frame of this equipment to the building electrical ground by use of the grounding terminal provided or other acceptable means may result in electrical shock Service must be performed only by qualified personnel The following commissioning procedures pertain to unit ventila tors equipped with the MicroTech Unit Ventilator Controller UVC These procedures mu
34. cified in Table 8 If the voltage levels are acceptable go on to step 6 If no voltage or improper voltage levels are found the UVC is defective and must be replaced 10 11 12 Check for proper voltage levels at the communication port IDC connector Use a DC voltmeter to test the voltage levels at the connector terminals with respect to ground Test at the connector terminals corresponding to the communication port terminals listed in Table 8 Verify that the voltages are within the ranges specified in the table If the voltage levels are acceptable connect the IDC connector to the Comm B port If no voltage or improper voltage levels are found verify that the NMP or LMP is energized and that the communications trunk wiring is intact Verify that network communications between the UVC and the NMP have initiated At the network PC change the operating mode to unoccupied and check that the status LED responds accordingly Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation refer to Table 6 Since the sensed temperatures are fixed at any given moment adjust the UVC heating and cooling setpoints at the network PC to obtain the expected heating or cooling control actions Adjust any other applicable parameters to obtain the expected UVC control actions Check that any desired network executed control features are working proper
35. d Wiring Check The unit ventilator factory configured options determine the low voltage field wiring requirements If a specific option is present on a particular unit ventilator as denoted by the model number the associated field wiring if any must be checked Detailed electrical installation instructions and field wiring diagrams are included in the model specific installation literature supplied with each unit ventilator Referring to this literature and using the following check lists the start up technician should thoroughly check the electrical installation before the commissioning process proceeds Wall Sensor Packages 1 Check that the cable is twisted and shielded 2 Checkthatthe required number of conductors are available 3 Check that the shield is grounded in accordance with the installation literature IM 613 Page 11 Rev 7 99 4 Check that the conductors have been terminated at the unit and the wall sensor package in accordance with the field wiring diagram 5 Check that the cable length between the wall sensor package and its UVC does not exceed 250 feet 6 460V Type AE amp AZ Only Check that 600 volt rated cable has been used Network Communication Master Slave or MicroTech Network Units 1 Check that the cable is a twisted shielded pair of conductors 2 Check that the shield is grounded in accordance with the installation literature 3 Check that the conductors have been terminated
36. e normally Table 10 RS 232 Communications Cable Terminations Comm Port Terminal Connection Jumped to terminal 2 Jumped to terminal 1 Transmit Not used Receive Ground Master UVC Connection Procedure Normally port Comm A of a master UVC is not available for any use The port may be reconfigured for PC communications at 9600 baud using the RS 232 format by performing the following procedure 1 Disconnect power to the UVC use fan switch or main power switch 2 Setthe hex switches to FF 3 Connect the PC to the UVC at port Comm A 4 Apply power to the UVC To return the master to normal operation remove power reset the hex switches disconnect the PC and restore power Note The above procedure will also reconfigure port Comm B As a result network communications will be discontinued UVC Inputs and Outputs IDC Terminal Connectors All connections to the UVC board are made using 0 156 insulation displacement type IDC terminals The IDC connectors can accept up to 18 AWG 0 085 OD wire They are available in two through six conductor styles see parts list The IDC connector displaces wire insulation to make contact with the conductor If a faulty UVC connection is suspected try pressing down on the wire in the IDC terminal with a small screwdriver Analog Inputs The UVC has 14 analog inputs Ten of these are available for external IDC connection the remainin
37. erature control until defrost mode ends For further information on the defrost control cycle refer to Bulletin No OM 101 MicroTech Unit Ventilator Controller Sequences of Operation Program UV1 Alarm Monitoring amp Controlled Response The MicroTech UVC is capable of sophisticated alarm monitoring and controlled response functions Each alarm or fault is prioritized indicated and responded to with the appropriate action If multiple alarms are present the alarm with the highest priority is indicated A summary of the available alarm features is shown in Table 3 For more information refer to the Alarm Monitoring amp Control section of this manual Following are brief descriptions of each feature Table 3 Alarm amp Controlled Response Feature Availability Unit Ventilator Model Alarm amp Controlled Response Feature Sensor Diagnostics Each Sensor Actuator Feedback Diagnostics Each Actuator Brownout Protection High Pressure Low Coil Temperature DX and or Water Low Refrigerant Temperature Water Coil Communication Error Master Slave Only Change Filter Network Units Only IM 613 Page 7 Rev 7 99 Sensor Diagnostics If a temperature sensor s value is out of range the UVC will detect it and take the appropriate action Each sensor fault has a specific priority alarm indication and set of response actions Actuator Feedback Diagnostics T
38. erature at the suspect sensor using an 4 042 973 accurate thermometer 394i 953 2 Determine the sensor s analog input number Refer to the 3 842 933 unit wiring diagram or to the input output tables Tables 11 3 748 914 through 17 3 655 895 3 565 877 3 Remove the IDC connector from its UVC terminals and Se Beg measure the resistance of the sensor through the IDC 3 e connection Using the thermistor chart Table 18 compare this value with the measured temperature SC If the measured resistance and temperature match go on 5 150 to step 4 3 074 IM 613 Page 26 Rev 7 99 If the measured resistance and temperature do not match either there is a wiring problem or the sensor is defective Check the IDC connection and the sensor circuit wiring for defects 4 Replace the connector and measure the DC voltage across the sensor terminals Using the thermistor chart compare this value with the measured temperature If the measured voltage and temperature match the UVC may require factory service or it may be defective If the measured voltage and temperature do not match the UVC is defective this assumes sensor and circuit are intact Temperature Sensor Faults The following procedure can be used to troubleshoot any of the six faults that indicate a temperature sensor failure This type of fault has a 2 10 11 12 or 13 blink fault code see Table 9 Itis usually caused by an open or shorted sensor circuit
39. erly commissioned the network UVC s may be started in any order However if the start up order follows the daisy chain from one UVC to the next it will be easier to detect any wiring problems that may exist in the communications trunk Communications Cable Check Perform this check for every communications trunk connected to a Network Master Panel NMP or Local Master Panel LMP 1 Be sure that the communication port IDC connectors are disconnected at every UVC on the trunk 2 Check that there are no shorts between any two conductors in the communications trunk Use an ohmmeter to test for shorts at the communication port IDC connector of the NMP or LMP For the three combinations of conductor pairs there should be infinite resistance between the conductors If the conductors are properly terminated this check will test for shorts through out the trunk Procedure for Each Network UVC 1 Verify that the main power switch is at Off 2 Setthe network address Each UVC on an NMP or LMP trunk must have a unique hex address This address should be specified in the job submittal drawings Refer to the submittal drawings and set the address in accordance with them This is a level 3 network address For further information refer to Hex Switches in the Component Data section of this manual 3 Apply power to the unit Turn the main power switch to On and the motor speed Switch to either desired speed wa
40. eturn the HEX switches to their proper settings then cycle power when you are done IM 613 Page 13 Rev 7 99 Slave units will communicate as expected when your PC is connected to Port A simply make sure you use the correct address for each Slave when using the Monitor program For example if the Slave HEX switches are set at 01 then the address you will use in the Monitor program will be 01 01 if the HEX switches are set to 02 on the Slave UVC then you use 01 02 as the address etc If you need to communicate with a UVC that is already con figured as a Master and is part of an operating Master Slave network then use the following method For example to calibrate actuators on a Master UVC connect to Port A on a Slave unit and set the Controller Address box on the Monitor Read Write screen to 01 00 This will gain access to the Master controller so that actuator calibration may be performed When a slave UVC loses communication to the Master UVC the Slave UVC will operate based upon its potentiometer settings i e Minimum OA Position etc located on the faceplate of the Slave UVC Initial Master Configuration 1 10 11 12 13 14 15 Connect the Master UVC s Port A to your PC using the proper cables Adjust the Master UVC s Hex switches to FF and cycle unit power auto calibration will occur Using the Windows Monitor software establish communi cations with the controller using address 00 FF
41. g four are used for internal connections to the three on board pots and the brownout voltage sensor The ten analog inputs that are available for external connection are labeled INO through IN9 on the UVC and the IM 613 Page 21 Rev 7 99 Unit wiring diagram Each input has two terminals an S signal terminal and a G ground reference terminal Inputs INO and IN1 have a common G terminal see Figure 1 The G terminals of inputs IN2 through INQ are internally connected Each S terminal is internally connected to a 5 VDC power supply through a 3 3 KW resistor The voltage at the S terminal varies as the temperature sensor resistance or actuator feedback signal changes The UVC converts these voltages into temperature or actuator position data Refer to Table 18 and Figure 6 Digital Inputs The UVC has six digital inputs all of which are available for external IDC connection These inputs are labeled DIGITAL IN on the UVC and DI 0 through DI 5 on the unit wiring diagram Each input has two terminals a numeric terminal and a common DI R ground terminal see Figure 1 All UVC digital input circuits are optically isolated The digital inputs sense the presence or absence of an external 24 VAC power source transformer X3 The power source is connected to the input through a switch or set of contacts see Figure 4 Refer to the wiring diagram supplied with your unit for specific wiring details
42. g valve body not included Valve actuator chilled water valve body included IDC style connector 2 terminal IDC style connector 3 terminal IDC style connector 4 terminal IDC style connector 5 terminal IDC style connector 6 terminal PC communications cable kit Notes 1 Thisis a partial listing of the unit ventilator replacement parts Contact your local representative for additional information 2 TheMicroTech UVC part order must include the job control number full unit model number and serial number so that the proper software can be factory loaded These numbers are listed on the unit data plate IM 613 Page 31 Rev 7 99 Notes HermanNelson AAF HermanNelson 4900 Technology Park Boulevard Auburn New York 13021 9030 USA 315 253 2771 e Printed on recycled paper containing at least 1096 post consumer recycled material 1999 AAF McQuay Incorporated
43. h its sequence of operation as outlined in the appropriate documentation refer to Table 6 Since the sensed temperatures are fixed at any given moment adjust the UVC heating and cooling setpoints at the network PC to obtain the expected heating or cooling control actions Adjust any other applicable parameters to obtain the expected UVC control actions Check that any desired network executed control features are working properly ventilation lockout demand limiting etc Review the submittal drawings and make any necessary changes to the default UVC setpoints and parameters Check the remote setpoint adjustment pot operation if present Verify that the expected UVC control action occurs when the remote pot is adjusted up or down Check that the exhaust fan interlock option works properly if present Verify that the OA damper opens when the exhaust fan interlock relay is energized PC Access A PC equipped with Monitor software is required for master or slave UVC start up For further information refer to PC Connection in the Service Information section of this manual Communications Cable Check 1 Be sure that the communication port IDC connectors are disconnected at every UVC on the network 2 Check that there are no shorts between any two conduc tors in the communications trunk Use an ohmmeter to test for shorts at the communication port IDC connector of the Master UVC For the three combinatio
44. he UVC will monitor the position feedback voltages of every modulating actuator provided with a particular unit ventilator If a feedback value is out of range the UVC will detect it and discontinue control of that actuator Each feedback failure fault has a specific priority and alarm indication Brownout Protection The brownout feature is meant to protect the compressor and electric heat contactors from low voltage or brownout condi tions If the supply voltage to the unit ventilator is below 85 of the nameplate value the UVC will detect it indicate it and de energize the compressor and electric heaters High Pressure If excessive pressure in the refrigeration circuit is detected by the external pressure switch the compressor will be de energized immediately hardware wired The UVC will immediately de energize the reversing valve disable the compressor and indicate the alarm Low Coil Temperature External thermostats will sense the DX and water coil temperatures if present The UVC will monitor each thermostat and if a low coil temperature is detected alarm indication and the appropriate action will occur Low Refrigerant Temperature Water Coil If the WSHP unit is in the heating mode and the refrigerant temperature is too low the UVC will indicate the alarm and immediately de energize the compressor and reversing valve Communication Error Master Slave Units Only If a communication error occurs between a sla
45. he amber LED will blink 3 seconds on then 3 seconds off until cali bration is complete This feature is not implemented in MicroTech 125 controllers All actuators version 5 software or lower are factory cali brated during unit testing and need not be calibrated at initial unit start up unless changes are made to linkage and or actuators are replaced The same memory addresses described in the procedures above may also be accessed using the DOS Monitor program ALWAYS if damper or valve problems are reported check for damper blockages or linkage problems that prevent full damper movement and or look for stuck or sticky valves correct any problems found then perform the appropriate calibration procedure To perform the calibration procedures below you must have the Windows Monitor program installed on a PC the PC must be connected with proper cabling to Port A on the MicroTech controller and you must have established communication between the PC and the controller The cable kit required to properly connect a 9 pin serial PC port to Port A on a MicroTech controller is P N 057186802 which will contain cables P N 067784501 and P N 067784503 You need to know which model of unit ventilator you will be working with before performing any of the calibration procedures MicroTech 325 F amp BP Damper and Water Valve Calibration The following procedure is for Model 7 hot water valve Model 8 F amp BP damper Models 9 hot water valve
46. he factory installed relay when ventilation lockout is desired 3 460V Type AE amp AZ Only Check that 600 volt rated conductors have been used Exhaust Fan Interlock 1 Check that the conductors have been terminated at the unit in accordance with the field wiring diagram 2 Check that the field supplied device energizes the factory installed relay when exhaust fan interlock is desired 3 460V Type AE amp AZ Only Check that 600 volt rated conductors have been used IM 613 Page 12 Rev 7 99 Remote Condensing or Heat Pump Unit AV AH Units Only Check that the conductors have been terminated at the unit in accordance with the field wiring diagram A CAUTION On AH units it is recommended that the outdoor air temperature sensor be located so that it will accurately sense the outdoor air temperature If this is not done improper unit operation or damage to the remote condensing or heat pump unit could occur The best location for the sensor is either outside the building shielded from solar radiation or in the outdoor air ductwork very near the intake Setpoint Initialization Stand alone and Master Slave Units The heating setpoint unoccupied offset and minimum OA damper position potentiometers pots should be set to the desired settings prior to start up For more information refer to Setpoint Adjustment Potentiometers in the Component Data section of this manual Note In a master slave applicat
47. ill close when the field connected relay coil is energized Network Units The ventilation lockout function is provided over the MicroTech network Exhaust Fan Interlock The exhaust fan interlock option provides a means of overriding normal UVC control and fully opening the outdoor air damper at any time Typically this application is used to supply makeup air when an exhaust fan is energized When the exhaust fan interlock option is ordered a relay 24 VAC is factory installed and wired to the UVC The OA damper will open when the field connected relay coil is energized IM 613 Page 9 Rev 7 99 Unit Ventilator Controller software is factory installed and tested in each unit prior to shipment The software is identified by a program code and software model number printed on a small label attached to the controller Refer to Figure 3 Figure 3 Software ID Tag Program Number Software Model UV Table 4 Programs and Software Models Software ID Table 4 shows the 7 programs and 18 software models used for the various unit ventilator models and configurations As shown in the table a program comprises one or more software models Program number codification is as follows UV1S2B Unit Ventilator Program Number Unit Type S Stand alone Open Protocol M Master Slave N MicroTech Network Software Version Numeric Software Version Revision Alphabetical Software Unit Ventil
48. illiary heat relay IM 613 Page 25 Rev 7 99 Test Procedures Table 18 Thermistor Chart This section contains troubleshooting procedures for the SF Ohms Volts F Ohms Volts SF Ohms Volts following 16 104 139 761 Microprocessor problems 15 627 140 746 Power supply problems 15 166 141 i PEIR l 14 720 142 717 Erroneous temperature readings 14 288 143 708 Temperature sensor faults codes 2 10 11 12 13 and 13 871 144 689 14 13 467 145 676 Digital input faults codes 3 and 5 13976 E 12 698 147 649 g Brownout fault code 6 12 333 148 637 Actuator feedback faults codes 7 8 and 9 11 979 Master slave communication error fault code 16 i Microprocessor Problems 10 983 The power and status LED indications can aid in UVC diagnostics Were l F 10 371 Power LED Immediately after power is applied to the UVC the 10 079 watchdog LED should illuminate continuously 8787 If the LED does not illuminate check that the UVC power supply 9 523 is intact see Power Supply Problems below 9 258 Status LED Approximately 40 seconds after power is applied 9 002 to the UVC the status LED should illuminate as shown in Table 8 753 1 829 1 If the LED fails to respond properly either there is a software Ste 1 788 problem or the UVC is defective If a PC and the prope
49. ing and the observed actuator position with the information below 4 Ifthe reading is between 0 2 0 1 VDC and 3 68 0 29 VDC the measured voltage is acceptable Attempt to clear the fault by cycling power to the UVC If the fault does not clear the UVC may require factory service or it may be defective If the reading is less than 0 1 VDC or greater than 3 97 VDC check the wiring and connections between the actuator and the UVC Look for shorts or disconnections Referring to the unit wiring diagram verify that the feedback wires are terminated properly If the wiring is intact and the fault does not clear go on to step 4 IM 613 Page 27 Rev 7 99 Note If the linkage is disconnected or damaged it is possible that the actuator could extend beyond the nomi nal full stroke of one half inch If it does the feedback voltage could exceed the acceptable upper limit 5 Remove the IDC connector from the analog input and measure the DC voltage across the UVC terminals It should be approximately 5 VDC If it is the actuator is defective If it is not the UVC is defective Note Stroke endpoint parameters for each actuator are loaded into the UVC at the factory and auto calibrated at each power up If an actuator must be replaced the stroke endpoint parameters in the controller may need to be reset If nuisance alarms are occurring or if a valve or damper will not fully close obtain factory service Figure 6 Barber Col
50. ing sensor faults Change Filter The Change Filter fault is a network feature indicating that the fan has operated longer than the set number of hours Typically this alarm is used to alert the building operator of the need to replace the filter To clear the fault the filter timer must be reset at the network PC Effect An alarm message lis sent over the network Communication Error The Communication Error fault can only occur on slave units It PC Connection A personal computer PC equipped with the appropriate Monitor software may be directly connected to any UVC Typically for start up or service purposes the PC would be a portable laptop or notebook type see PC specification below For stand alone master or slave controllers the computer must be loaded with stand alone Monitor software For network controllers the PC must be loaded with the job specific network Monitor software For all unit types the PC is connected to the UVC at port Comm A For master UVC s only a special procedure is required to reconfigure the port for PC connection see below MicroTech controllers use the RS 232C format for PC communications The data transmission speed is 9600 baud PC Specification A directly connected computer may be used for monitoring unit operation changing setpoints trend logging downloading soft ware and diagnostics The PC must be an IBM or 100 true compatible with the following features m
51. inimum requirements 386SX microprocessor 2 Megabytes of RAM Random Access Memory 60 Megabyte hard disk drive 3 floppy disk drive Asynchronous Serial Communications Adapter 9 or 25 pin male 101 enhanced keyboard VGA graphics capability Internal time clock battery backed Windows 3 1 or Windows 95 MicroTech Monitor software Cable Specification A properly terminated shielded twisted pair cable is required to connect a PC to the UVC Belden 8761 or equivalent The cable must be terminated at an IDC connector as shown in Table 10 The maximum allowable cable length for direct connection be tween the PC and UVC is 50 feet If the desired length is over 50 feet an RS 232 cable extension kit is required contact AAF McQuay A universal communications cable kit that allows a PC to be connected to any MicroTech controller is available from AAF McQuay The part number is 57186801 Service Information indicates that the unit is not communicating with its master Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting this fault Effects Room temperature unoccupied offset and minimum OA damper position setpoints will be obtained from the slave UVC s on board pots The operating mode will be that last received over the network from the master cycling power will place the unit in the occupied mode All other control processes execut
52. ion 1 10 T1 12 13 14 Connect all Slave UVC Port B s to the Master UVC s Port B as shown on the drawings provided with the unit ventilator these drawings are typically mounted on the inside of one of the unit ventilators removable panels Connect the Slave UVC s Port A to the PC using the proper cables Using the Windows Monitor software establish communi cations with the controller using network addresses 00 FF In the Windows Monitor program secure the correct Master Slave sotware then go to the Support menu and choose Read Write On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter Key 8011 8012 8001 8002 0911 0204 Write a value of 33 to location 8011 by clicking on the current value Write a value of O to location 8012 by clicking on the current value Write a value of 1 to location 0911 by clicking on the current value Write a value of 4 to location 0204 to reset the controller Change location 8001 to equal 8002 if there is a difference If no difference go to the next step Change the Slave UVC Hex switches to 01 for Slave 1 02 for Slave 2 03 for Slave 3 etc Write a value of 4 to location 0204 to again reset the controller Slave configuration is com
53. ion the master s pot settings define the setpoint values for its slave controllers If communications fail the affected slaves read their setpoint values from their own setpoint pots For this reason it is recommended that the three on board setpoint pots on each slave be set so that they match the master s settings Network Units The three setpoint adjustment potentiometers on a network unit are not operational The UVC setpoint values are held in memory and can only be modified over the MicroTech network Initially before any changes are made over the network the UVC will use the default factory set setpoints shown in Table 7 Table 7 Network UVC Default Setpoints Setpoint Value Occupied Cooling Occupied Heating Unoccupied Cooling Unoccupied Heating Minimum OA Damper Position Following are UVC start up procedures for each communication type The start up procedure must be performed by a qualified technician for every UVC on a job Table 8 Network Communication Port Terminal Voltage Ranges Communication Acceptable Port Terminal Voltage Reading 6 Gen 0 0 0 2 VDC Stand alone Because stand alone controllers are independent of each other they may be started in any order PC Access APC is not required for stand alone UVC start up however the start up process will be easier and faster if a PC is used If a PC is used it must be equipped with Monitor software For further informa
54. ion 0212 Then write a 255 to location 0213 this will return a value of 1 This will begin forcing the F amp BP damper to the full face position or begin opening the valve Watch memory location 0506 change when this value stops changing the damper is in the full face position or valve fully opened On a sheet of paper write this value down for later use Write a 0 to location 0213 Using the Read Write screen write the lowest value of the two numbers you wrote down on the sheet of paper to location 091A then write the higher value to location 091B Change location OAOI to match 0A02 Reset the controller by writing 4 to location 0204 The controller should start its program and begin operating normally Note The same procedure is used for MicroTech 125 control lers except you must replace all instances of 0A01 with 8001 and replace all instances of 0A02 with 8002 MicroTech 325 Water Valve Calibration The following procedure is for Model 13 hot water valve only not cold water valve 1 Establish communications to the controller using a PC with the Windows Monitor software and proper cables In the Windows Monitor program go to Support menu and choose Read Write Make sure the address located in the Controller Address box is the same as the UV you wish to work on If you are directly connected to the controller you wish to work on and the controller is not a Master in a Master Slave network then the Controller
55. ir temperature sensor Outdoor air temperature sensor Water in temperature sensor Not Used Water out temperature sensor Not Used amp low refrigerant temperature switch Outside air damper position Outside air damper position Day night changeover device optional Ventilation lockout default or exhaust fan interlock optional Ventilation lockout default or exhaust fan interlock optional Day night changeover device optional Emergency heat switch SW5 Not Used High pressure switch HP Not used Not used High pressure switch HP Low DX coil temperature switch T4 Fan relay R4 Low DX coil temperature switch T4 Low DX coil temperature switch T4 Not used Compressor relay R1 Fan relay R4 Reversing valve Outside air damper open Outside air damper close Compressor relay R1 on AZ R7 on AV AH Compressor relay R7 Not used Electric heat stage 1 Not used Not used Outside air damper open Electric heat stage 2 Outside air damper close Not used Electric heat stage 3 Not used ectric heat stage 1 ot used ectric heat stage 1 Exhaust fan relay or auxilliary heat relay ectric heat stage 2 ectric heat stage 2 ectric heat stage 3 ot used E N E E Not used E E N E ect
56. it 5 minutes until calibra tion is complete 4 Check the status LED The status LED should illuminate after calibration If a wall sensor package is used the remote status LED should also illuminate IM 613 Page 16 Rev 7 99 10 11 12 Check for proper voltage levels at the Comm B port Use a DC voltmeter to test the voltage levels at the Comm B terminals with respect to ground The terminals and acceptable voltage ranges are specified in Table 8 If the voltage levels are acceptable go on to step 6 If no voltage or improper voltage levels are found the UVC is defective and must be replaced Check for proper voltage levels at the communication port IDC connector Use a DC voltmeter to test the voltage levels at the connector terminals with respect to ground Test at the connector terminals corresponding to the communication port terminals listed in Table 8 Verify that the voltages are within the ranges specified in the table If the voltage levels are acceptable connect the IDC connector to the Comm B port If no voltage or improper voltage levels are found verify that the NMP or LMP is energized and that the communica tions trunk wiring is intact Verify that network communications between the UVC and the NMP have initiated At the network PC change the operating mode to unoccupied and check that the status LED responds accordingly Verify that the unit ventilator is operating in accordance wit
57. its sequence of operation as outlined in the appropriate documentation refer to Table 6 Since the sensed temperatures are fixed at any given moment adjust the UVC heating and cooling setpoints to obtain the expected heating or cooling control actions This can be accomplished either by adjusting the pots at the master or by disconnecting the communications cable and adjusting the pots at the slave If the latter option is chosen be aware that the status LED will indicate a 16 blink communication failure alarm If a PC is available adjust any other applicable parameters at the slave to obtain the expected UVC control actions Check that the ventilation lockout option works properly if present When the unit is in the occupied operating mode verify that the CA damper closes when the ventilation lockout relay is energized Check that the exhaust fan interlock option works properly if present Verify that the CA damper opens when the exhaust fan interlock relay is energized IM 613 Page 15 Rev 7 99 Network Prior to the start up of any Network Unit Ventilator Controllers the following MicroTech network devices must be commissioned IBM compatible PC with Monitor software Network Master Panel Local Master Panel as applicable Loop Water Controller as applicable Refer to the literature supplied with these products for information on installing and commissioning them After these devices have been prop
58. ixed at any given moment adjust the room setpoint and unoccupied offset pots to obtain the expected heating or cooling control actions If a PC is available adjust any other applicable parameters to obtain the expected UVC control actions Check for remote setpoint adjustment pot operation if present Verify that the expected UVC control action occurs when the remote pot is adjusted up or down Check that the ventilation lockout option works properly if present When the unit is in the occupied operating mode verify that the OA damper closes when the ventilation lockout relay is energized Verify that the OA damper opens when the exhaust fan interlock relay is energized Check that the fan interlock option works properly if present Verify that the OA damper opens when the exhaust fan interlock relay is energized To Check Existing Slave UVC 1 2 Verify that the main power switch is at Off Set the network address Each slave must have a unique hex address Begin by setting the first slave s address to 01 This is a level 3 network address Address each subsequent Slave in consecutive order 02 03 04 05 For further information refer to Hex Switches in the Component Data section of this manual Apply power to the unit Turn the main power switch to On and the motor speed switch to desired speed wait 5 minutes until calibration is complete Check the status LED
59. ly ventilation lockout demand limiting etc Review the submittal drawings and make any necessary changes to the default UVC setpoints and parameters Check the remote setpoint adjustment pot operation if present Verify that the expected UVC control action occurs when the remote pot is adjusted up or down Check that the exhaust fan interlock option works properly if present Verify that the OA damper opens when the exhaust fan interlock relay is energized IM 613 Page 17 Rev 7 99 Alarm Monitoring amp Control The Unit Ventilator Controller UVC is programmed to monitor the unit ventilator for specific alarm conditions that may occur on the various model types If an alarm condition exists and is detected by the UVC a fault will occur The UVC will indicate the fault and execute appropriate control actions for the alarm conditions For most faults these actions will fail safe the unit ventilator Fault Code Interpretation UVC faults are indicated at the status LED on board or remote If a fault exists operating mode indication will be replaced by an alarm specific fault indication the fault code A fault code is a series of blinks followed by a one second pause The number of blinks identifies the alarm condition as shown in Table 9 The fault code sequence will repeat continuously until the fault is cleared Priority and Multiple Alarms Faults are ranked in order of their priority Higher priorit
60. man Actuator Position Feedback Voltages 160 140 e eo 80 60 40 Actuator Extension 96 20 E 0 pem 20 00 04 08 12 16 20 24 28 32 36 40 44 48 Voltage VDC Notes 1 Extension percentage is based on z inch nominal full stroke Voltages are measured at UVC analog input terminals Range of expected accuracy is defined by the dotted lines Voltage at maximum possible actuator extension is 4 63 VDC linkage disconnected Master Slave Communication Error Fault A master slave communication error is indicated by a 16 blink fault code Troubleshooting this fault is limited to the following checks Verification of master and slave UVC communication port voltages Verification of communications wiring integrity Verification of network addressing The best way to accomplish these checks is to perform the master slave start up procedure Refer to Master Slave in the Start up section of this manual If all of the above checks have been performed and the UVC will still not communicate either the controller is defective or factory service is required IM 613 Page 28 Rev 7 99 UVC Replacement Data relating to the unit ventilator configuration and actuator characteristics are stored at the factory when each unit is built and tested This information defines the program number software model and several parameter settings that are unique for e
61. mperature Sensor Failure fault will occur when the voltage across the discharge air sensor is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on trouble shooting sensor faults Effects as applicable Control Temperature is set equal to the room temperature Discharge air low limit functions are disabled IM 613 Page 20 Rev 7 99 Discharge air high limit function is disabled All other control processes execute normally discharge air temperature is assumed to be acceptable Outdoor Air Temperature Sensor Failure The Outdoor Air Temperature Sensor Failure fault will occur when the voltage across the outdoor air sensor is outside the acceptable range Refer to Test Procedures in the Service Information section of this manual for information on trouble shooting sensor faults Effects as applicable Economizer cooling is disabled ventilation cooling lockout function assumes OA temperature is high Compressorized cooling is disabled on all except AR unit low ambient compressor lockout function assumes OA temperature is low On ASHP units electric heat can be enabled by the emergency heat defrost or discharge air low limit functions only OA temperature is assumed to be high Heating EOC valve is controlled by room temperature only OA temperature is assumed to be high Water In Temperature Sensor Failure The
62. n this value stops changing the damper is in the full bypass position valve fully closed On a sheet of paper write this value down for later use 10 Write a 0 to location 0216 Then write a 255 to location 0217 this will return a value of 1 This will begin forcing the F amp BP damper to the full face position or begin opening the valve 11 Watch memory location 0506 change when this value stops changing the damper is in the full face position valve fully opened On a sheet of paper write this value down for later use 12 Write a 0 to location 0217 13 Using the Read Write screen write the lowest value of the two numbers you wrote down on the sheet of paper to location 091A then write the higher value to location 091B 14 Change location 0A01 to match 0A02 15 Resetthe controller by writing 4 to location 0204 16 The controller should start its program and begin operating normally Note The same procedure is used for MicroTech 125 control lers except you must replace all instances of 0A01 with 8001 and replace all instances of 0A02 with 8002 MicroTech 325 F amp BP Damper and Water Valve Calibration The following procedure is for Model 11 heat cool water valve Model 13 cold water valve not hot water valve Model 15 cold water valve Model 17 cold water valve and Model 18 F amp BP damper 1 Establish communications to the controller using a PC with the Windows Monitor software and proper cables 2
63. nd unoccupied offset pots to obtain the expected heating or cooling control actions If a PC is available adjust any other applicable parameters to obtain the expected UVC control actions 7 Check the remote setpoint adjustment pot operation if present Verify that the expected UVC control action occurs when the remote pot is adjusted up or down 8 Check that the ventilation lockout option works properly if present Start U p When the unit is in the occupied operating mode verify that the OA damper closes when the ventilation lockout relay is energized 9 Checkthat the exhaust fan interlock option works properly if present Verify that the OA damper opens when the exhaust fan interlock relay is energized Master Slave Because it provides operating mode and setpoint information to the slaves on its network the master UVC must be started before any slave After the master has been started the slaves may be started in any order However if the start up order follows the daisy chain from the master UVC to successive slaves it will be easier to detect any wiring problems that may exist in the communications trunk To perform the setup procedures on the next page you must have the Windows Monitor program installed on a PC the PC must be connected with proper cabling to Port A on the MicroTech con troller and you must have established communication between the PC and the controller The cable kit required to properl
64. ns of conductor pairs there should be infinite resistance between the conductors If the conductors are properly terminated this check will test for shorts through out the network Use an ohmmeter to test for shorts at the communication port IDC connector of the NMP or LMP For the three combinations of conductor pairs there should be infinite resistance between the conductors If the conductors are properly terminated this check will test for shorts throughout the trunk Procedure for Each Network UVC 1 Verify that the main power switch is at Off 2 Setthe network address Each UVC on an NMP or LMP trunk must have a unique hex address This address should be specified in the job submittal drawings Refer to the submittal drawings and set the address in accordance with them This is a level 3 network address For further information refer to Hex Switches in the Component Data section of this manual 3 Apply power to the unit Turn the main power switch to On and the motor speed Switch to either desired speed wait 5 minutes until calibra tion is complete 4 Check the status LED The status LED should illuminate after calibration If a wall sensor package is used the remote status LED should also illuminate 5 Check for proper voltage levels at the Comm B port Use a DC voltmeter to test the voltage levels at the Comm B terminals with respect to ground The terminals and acceptable voltage ranges are spe
65. ntilator control cycle The UVC uses the room temperature sensor to control the heating ventilating and cooling functions of the unit ventilator ASHRAE II Cycle A discharge air temperature sensor is installed in all unit ventilators If necessary the ASHRAE II control algorithm can override room control and modify the heating ventilating and cooling functions as available to prevent the discharge air temperature from falling below the discharge air low limit setpoint The discharge air low limit setpoints and sequences of operation vary and are dependent on the unit ventilator model and configuration For further information refer to the sequence of operation document Bulletin No OM101 through OM107 provided with your unit Room Temperature Sensor A room temperature sensor is required for all unit ventilators It may be unit mounted or wall mounted Unit Mounted Sensor The unit mounted room sensor is factory installed and factory wired It is located within an aspirating sampling chamber behind the unit ventilator fan access panel Wall Mounted Sensor There are optional wall sensor packages available All wall sensors include a remote status LED Tenant override setpoint adjustment and bimetal thermometer are optional wall sensor features that are available in any combination The wall mounted sensor must be field installed and field wired to the unit ventilator Refer to the model specific unit ventilator installation ma
66. nual and to Bulletin No IM 529 Micro Tech Room Temperature Sensors for information on wall sensor package installation Remote Room Setpoint Adjustment The remote setpoint adjustment potentiometer allows the room setpoint to be adjusted up or down by as much as 3 F It is available with several of the optional wall sensor packages and it may be used with all except slave type Unit Ventilator Control lers Tenant Override A unit mounted or wall mounted tenant override switch is available for use with all except slave type Unit Ventilator Controllers The tenant override switch provides a momentary contact closure that causes the unit to enter the tenant override operating mode for a set time period default 2 120 minutes Except for the fact that it is temporary the tenant override operating mode is identical to the occupied operating mode Unit Mounted Tenant Override Switch The optional unit mounted tenant override switch is factory installed and factory wired Wall Mounted Tenant Override Switch The wall mounted tenant override switch is available with several of the optional wall sensor packages The wall sensor package must be field installed and field wired to the unit ventilator Refer to the model specific unit ventilator installation manual and to Bulletin No IM 529 MicroTech Room Temperature Sensors for information on wall sensor package installation Day Night Changover Day night changeover control is required
67. omplete room temperature and ventilation control Master Slave The master slave application is designed to provide even temperature control of a zone containing up to six unit ventilators One controller in the zone must be designated and programmed to be the master and up to five controllers may be designated and programmed to be its slaves IM 613 Page 8 Rev 7 99 The master controller establishes the following parameters for itself and for each of its slaves Operating mode occupied unoccupied or tenant override Minimum OA damper position setpoint Occupied heating and cooling setpoints Unoccupied heating and cooling setpoints Because each UVC in the zone uses its own room temperature sensor and a common room temperature setpoint even temperature control will be maintained regardless of any load variation within the zone Master A master UVC is similar to stand alone UVC The only difference is that Comm B of a master controller is used for master slave network communications The minimum position setpoint room setpoint unoccupied offset operating mode and remote setpoint adjustment if used must be set at the master Slave A slave UVC receives its operating mode and the above setpoint information from its master When communications are established between a slave and its master the slave will ignore its three on board setpoint potentiometers Communication Failure If the communication link between a
68. on of this manual For more information on MicroTech network addressing refer to the MicroTech Network Master Panel installation bulletin Table 2 Hexadecimal to Decimal Conversion Guide LO Hex Digit 6 A Hex switch setting 00 has a special purpose It should not be used for normal operation IM 613 Page 5 Rev 7 99 Communication Ports The UVC has two communication ports Comm A and Comm B Following are brief descriptions of each communication port s function For further information refer to the Service Information section of this manual Stand alone and Network Units Comm B is for MicroTech network communications to the Local Master Controller using an RS 485 format Comm B is configured this way in a stand alone unit but not used Comm A is for communications to an IBM compatible PC using an RS 232 format Master Slave Units Communications between master and slave UVC s is done using an RS 485 format On the master unit Comm B is used for communications to the slaves and Comm A is not used On a slave unit Comm B is used for communications to the master and Comm A is available for communications to an IBM compatible PC using an RS 232 format Temperature Sensors The MicroTech UVC uses negative temperature coefficient NTC thermistors for temperature sensing A thermistor chart which provides voltage to temperature and resistance to temperature conve
69. osition Ventilation lockout default or exhaust fan interlock optional Day night changeover device optional Emergency heat switch SW5 amp defrost control T5 High pressure switch HP Low DX coil temperature switch T4 Fan relay R4 Compressor relay R1 on AE R7 on AV AH Reversing valve Outside air damper open Outside air damper close Electric heat stage 1 Electric heat stage 2 Electric heat stage 3 Exhaust fan relay or auxilliary heat relay Notes 1 Emergency heat switch SW5 and defrost control T5 are wired in parallel SW5 has momentary contacts and T5 has maintained contacts 2 High pressure switch HP is not installed on AV AH units These units are wired to provide a constant no fault condition Figure 5 Relay Output Wiring Example 24 VAC OMM x3 Modulating Actuator Table 12 Connection Inputs and Outputs for Program UV2 Table 13 Units Models AR Software Model Component Description Connection Tenant override or remote spt adjust or both optional Inputs and Outputs for Program UV3 Units Models AZ or AV AH Software Model Component Description Tenant override or remote spt adjust or both optional Room temperature sensor Room temperature sensor Discharge air temperature sensor Discharge air temperature sensor Outdoor a
70. plete repeat this process for each Slave To Check an Existing Master UVC 1 2 Verify that the main power switch is at Off Set the network address For a master UVC it is recommended that this hex switch setting be 01 This is a level 2 network address For further information refer to Hex Switches in the Component Data section of this manual Apply power to the unit Turn the main power switch to On and the motor speed switch to desired speed Check the status LED and operating mode changeover devices The status LED should illuminate after calibration If a wall sensor package is used the remote status LED should also illuminate Referring to Table 1 verify that the day night changeover and tenant override options if present are working properly Do this by switching these devices and observing the status LED Check for proper voltage levels at the Comm B port Use a DC voltmeter to test the voltage levels at the Comm B terminals with respect to ground The terminals and acceptable voltage ranges are specified in Table 8 If the voltage levels are acceptable connect the IDC connector to the Comm B port If no voltage or improper voltage levels are found the UVC is defective and must be replaced Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation refer to Table 6 Since the sensed temperatures are f
71. r software 8 278 TH is available try downloading new software If this does not help 8 052 15 08 the UVC is defective and must be replaced 1 832 1 670 7 619 1 633 Power Supply Problems 7 413 1 597 The UVC requires a 24 VAC power supply It is connected to 7 213 1 562 the board at the section labeled POWER terminal 6 24V A 7 019 1 528 transformer steps down the line voltage to the required 24 VAC 6 831 1 494 transformer X2 or X3 line to 24 VAC Transformer X2 is used 6 648 1 461 only on units with compressors Refer to the unit wiring diagram 6 471 1 430 If a problem with the UVC power supply is suspected check the lt following 5971 E 1 Verify that the main power switch is at On 5 814 1 310 2 Check the voltage at the secondary of transformer X2 or 5 662 1 282 X3 It should be approximately 24 VAC load dependent 5 514 1 254 Transformer X3 provides auxiliary power for the UVC It is used Sai Weg for the digital input and relay output circuits If the controller LED s See 1196 are responding properly but the fan will not run transformer X3 1966 ER may be defective Check the voltage at the secondary of trans e Se 1355 former X3 it should be approximately 24 VAC 4714 ETT Erroneous Temperature Readings 4 394 1 080 If it is suspected that the UVC is operating using erroneous LANT 1 098 temperature data the following procedure may be used to check 4 363 1 036 the sensors 3 295 1 014 4 146 993 1 Measure the temp
72. ric heat stage 3 Notes Exhaust fan relay or auxilliary heat relay 1 High pressure switch HP is not installed on AV AH units These units are wired to provide a constant no fault condition IM 613 Page 23 Rev 7 99 Table 14 Inputs and Outputs for Program UV4 Table 15 Inputs and Outputs for Program UV5 Units Models AZ or AV AH Units Models AV AH 2 pipe Software Software UE Connection Model Component Description Connection Model Component Description Tenant override or remote spt adjust or both optional Room temperature sensor Tenant override or remote spt adjust or both optional Room temperature sensor All Discharge air temperature sensor Discharge air temperature sensor Outdoor air temperature sensor Outdoor air temperature sensor Water in temperature sensor Water in temperature sensor Heating valve position Heating valve position F amp BP damper position F amp BP damper position Outside air damper position Heat cool valve position Day night changeover device optional F amp BP damper position Ventilation lockout default or exhaust fan interlock optional Outside air damper position Day night changeover device optional Ventilation lockout default or exhaust fan interlock optional High pressure HP amp low DX coil temp OG T4 switches Low water coil temperature switch T6 Fan relay R4 Compressor relay
73. rite the higher value to location 0936 Change location 0A01 to match 0A02 Reset the controller by writing 4 to location 0204 The controller should start its program and begin operating normally Note The same procedure is used for MicroTech 125 control lers except you must replace all instances of 0A01 with 8001 and replace all instances of 0A02 with 8002 MicroTech 325 OA Damper Calibration The following procedure is for all Models 1 Establish communications to the controller using a PC with the Windows Monitor software and proper cables In the Windows Monitor program go to Support menu and choose Read Write Make sure the address located in the Controller Address box is the same as the UV you wish to work on If you are directly connected to the controller you wish to work on and the controller is not a Master in a Master Slave network then the Controller Address 00 FF may be used On the Read Write screen in the Operation box select the Monitor radio button by clicking on it In the Display box select the Decimal radio button by clicking on it Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter key 0212 0217 0A01 0A02 0204 0505 0507 0901 0902 091A 0918 Notice in the Read Write area that the values located in 0A01 and 0A02 are identical Write to 0A01 by clicking on the value and change it to any value other than the value at 0A02 Write a val
74. rsion data is included in the Service Information section of this manual Table 18 The following are standard MicroTech UVC control features as applicable to the various unit ventilator model types Control Temperature Change and Step amp Wait control algorithms Compressor short cycle protection Low ambient lockout Random start Delayed reversing valve de energization Emergency heat Defrost Alarm monitoring amp controlled response Control Temperature All unit ventilators are designed to control the room or zone temperature In order to maintain more stable room temperature control the UVC uses the concept of a Control Temperature Depending on the unit ventilator model configuration and current mode of operation the Control Temperature could be either 1 the actual room temperature or 2 a weighted value equal to 19 20 room temperature and 1 20 discharge air tem perature Throughout the remainder of this manual room temperature and Control Temperature will be assumed to be synonymous For further information refer to the sequence of operation document provided with your unit see Table 6 Change and Step amp Wait Algorithms The Change and Step and Wait algorithms work together in a IM 613 Page 6 Rev 7 99 Standard Control Features Actuators The UVC uses hydraulic spring return floating control actuators with position feedback for valve and damper modulation
75. sly it is extremely important that the correct unit ventilator be placed in the correct location in accordance with job requirements Proper unit ventilator location should have been determined during the installation process Nevertheless proper location must be verified during the commissioning process Pre Start A large part of the commissioning procedure is ensuring that the unit ventilator operates according to its programmed sequence of operation The unit ventilator sequences of operation are described in the program specific literature listed in Table 6 Table 6 Program Specific Sequence of Operation Literature UVC Program Operation Manual Bulletin Number Uu Uu Uva Uu UV Uve Uv7 Know Your Unit Ventilator Before commissioning can proceed the start up technician must know which options are supposed to be present on a particular unit ventilator 1 Check the model number code string against the job requirements Refer to the unit specific installation bulletin for a guide to model number nomenclature 2 Check the program and software model numbers against the unit model number code string The UVC software must be compatible with the unit ventilator configuration Refer to the Software ID section of this manual Note If a PC is being used for commissioning check the software ID using the Monitor program The controller s program is identified on one of the display screens Fiel
76. sor equipped unit ventilators self contained or split System include compressor low ambient lockout protection This feature will prevent compressor operation when the unit is in the cooling mode and the outdoor air temperature is below 59 F Random Start A random start feature is provided with all compressor equipped unit ventilators self contained or split system This feature will prevent simultaneous compressor start up that could otherwise occur after the following events Unit power up Unoccupied to occupied changeover Brownout condition The compressor start delay can be from 1 to 63 seconds and is determined by the UVC hex switch setting For more information refer to Hex Switches in the Component Data section of this manual Delayed Reversing Valve De energization All heat pump unit ventilator models have a 60 second default reversing valve de energization delay feature This delay prevents the reversing valve from returning to its normal cooling position for a period of 60 seconds after the compressor is de energized when the unit is in the heating mode If necessary an alarm condition can override the 60 second timer and de energize the reversing valve with the compressor Emergency Heat All heat pump unit ventilator models that are equipped with electric heat have an emergency heat feature The emergency heat mode is initiated by depressing the momentary unit mounted emergency heat switch When the
77. st be performed in addition to the mechanical and electrical system commissioning procedures that are outlined in the model specific installation literature Table 5 provides a listing of this literature Caution Before power is applied to any unit the pre start procedures in the model specific installation literature must be closely followed Table 5 Model Specific Unit Ventilator Installation Literature Unit Ventilator Installation amp Maintenance Model Data Bulletin Number AV AH UV 3 200 IM 506 Required Tools and Literature The following tools and additional literature may be required to properly commission a MicroTech UVC Tools 1 Digital voltmeter Digital ohmmeter Digital thermometer General technician s tools Qr 4e OX PC equipped with Monitor software required for master slave and Network UVC optional for stand alone UVC s Literature 1 Model specific unit ventilator installation bulletin see Table 5 2 Program specific sequence of operation bulletin see Table 6 Unit Ventilator Identification The AAF McQuay unit ventilators look similar however there are significant internal differences which are defined by the model number code string In addition to the basic heating and cooling equipment the model number code string specifies which factory configured options have been provided These options determine the internal wiring configuration and the field wiring requirements Obviou
78. t will void the warranty AWARNING This MicroTech control panel is designed to be stored and operated in temperatures from 32 F to 140 F and in relative humidity up to 95 noncondensing IM 613 Page 3 Rev 7 99 The MicroTech Unit Ventilator Controller UVC is a microproces sor based controller designed to provide sophisticated control of an economizer equipped AAF HermanNelson unit ventilator In addition to providing normal operating control the MicroTech UVC provides alarm monitoring and alarm specific component shutdown if critical system conditions occur Each UVC is factory wired and factory programmed for the spe cific unit ventilator model and configuration options ordered by Figure 1 MicroTech Unit Ventilator Controller Communication Ports Digital Inputs General D escription Component D ata the customer The UVC can be wired and programmed to oper ate as a stand alone controller as a master or slave controller or as a MicroTech network controller Communication ports allow networking capability and access to any UVC from an IBM compatible personal computer PC equipped with Monitor software The MicroTech Unit Ventilator Controller UVC is shown in Figure 1 Analog Inputs 123 123456 R54 322 COMMB COMMA DIGITAL INPUT 10 70 Hex Switches So 50 5 15 HI LO 65 ee 10 75 COOLING SETPOINT IS Minimum OA FACTORY SET 6 F ABOVE Damper L9 DESS network O Position Pot 100
79. tion refer to PC Connection in the Service Information section of this manual Procedure for Each Stand alone UVC 1 Verify that the main power switch is at Off 2 Verify that the hex switch setting is not 00 or FF These settings are reserved for special applications For further information refer to Hex Switches in the Component Data section of this manual 3 Compressorized Units Only Self contained or Split System Set hex switches for random start delay Valid settings are between 01 and 3F For further information refer to Random Start in the Standard Control Features section of this manual 4 Apply power to the unit Turn the main power switch to On and the motor speed switch to the desired speed wait 5 minutes until calibration is complete 5 Check the status LED and operating mode changeover devices The status LED should illuminate after calibration If a wall sensor package is used the remote status LED should also illuminate Referring to Table 1 verify that the day night changeover and tenant override options if present are working properly Do this by switching these devices and observing the status LED 6 Verify thatthe unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation refer to Table 6 Since the sensed temperatures are fixed at any given moment adjust the room setpoint a
80. to 24 VAC to simulate a no fault condition AZ Units with Wet Heat Note that a 3 blink fault code could be either a high pressure or low DX coil temperature alarm Effects as applicable Compressor is immediately de energized Low DX Coil Temperature 3 Blink Fault Code The 3 blink Low DX Coil Temperature fault is an indication that the low temperature switch input DI 4 sensed an open circuit while the controller was calling for the compressor to run The low DX coil temperature switch T4 is wired in series with the compressor relay output RO 2 and the UVC alarm input Switch T4 will open when the coil temperature falls below its setpoint Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults AZ Units with Wet Heat Note that a 3 blink fault code could be either a low DX coil temperature or high pressure alarm Effect Compressor is immediately de energized Low Refrigerant Temperature Water Coil The Low Refrigerant Temperature fault will occur when the water source heat pump is in the heating mode and the refrigerant temperature is at or below the low limit setpoint Usually a low refrigerant temperature condition is caused by in sufficient water flow Effects Compressor is immediately de energized Reversing valve is immediately de energized Low DX Coil Temperature 5 Blink Fault Code The 5 blink Low DX
81. ue of 4 to location 0204 This will reset the controller The program will stop all outputs will go off Write 255 to location 0214 this will return a value of 1 This will begin opening the OA damper 9 Watch memory location 0507 change when this value stops changing the OA damper should be fully opened On a sheet of paper write this value down for later use 13 Using the Read Write screen write the lowest value of the two numbers you wrote down on the sheet of paper to location 0901 then write the higher value to location 0902 10 Write a 0 to location 0214 Then write a 255 to location 14 0215 this will return a value of 1 This will begin closing the 15 OA damper Change location 0A01 to match 0A02 Reset the controller by writing 4 to location 0204 16 The controller should start its program and begin 11 Watch memory location 0507 change when this value stops operating normally changing the OA damper is fully closed On a sheet of pa per write this value down for later use 12 Write a0 to location 0215 Note The same procedure is used for MicroTech 125 controllers except you replace all instances of 0A01 with 8001 and replace all instances of 0A02 with 8002 Parts List Part No 073397901 GEF1947 4EZS9315 4EZS9316 4EZS9317 4EZS9318 4EZS9319 4EZS9320 4EZS9321 4EZS9322 GEF1947 GEF1948 GEF1945 GEF1948 GEF1948 4EAL7261 4EAL7759 4EAL7759 4EWJ8505 4EPC8561 4EPC9174 4EPC7997
82. ut section between the left 9 terminal and the CT terminal see Figure 1 If the voltage at these terminals is less than 8 57 VAC for at least 10 seconds the brownout fault will occur The fault will automatically clear if the voltage at the terminals remains greater than 8 93 VAC for at least 5 minutes If a brownout fault occurs check the line voltage to the unit ventilator If it is less than 85 of the nameplate value contact the power company If the line voltage remains greater than 85 of the nameplate value for more than 5 minutes but the fault does not reset perform the following procedure 1 Check the primary and secondary voltages of power supply transformers X2 or X3 2 Check for faulty wiring or connections throughout the power supply circuit Actuator Feedback Faults The following procedure can be used to troubleshoot any of the three faults that indicate an actuator feedback failure This type of fault has a 7 8 or 9 blink fault code see Table 9 It is usually caused by a defective actuator or a mis wired feedback circuit 1 Estimate the amount of actuator extension by observing the position of the valve or damper Verify that the actuator linkage is intact 2 Determine the feedback circuits analog input number Refer to the unit wiring diagram or to the input output tables Tables 11 through 17 3 Leaving the connector in place measure the DC voltage across the input terminals Compare this read
83. uts for Program UV7 Units Models AV AH Software Model Component Description Tenant override or remote spt adjust or both optional Room temperature sensor Discharge air temperature sensor Outdoor air temperature sensor Water in temperture sensor Chilled water valve position F amp BP damper position Chilled water valve position F amp BP damper position Outside air damper position Day night changeover device optional Ventilation lockout or exhaust fan interlock optional Not used Low water coil temperature switch T6 Not used Low water coil temperature switch T6 Not used Fan relay R4 Chilled water valve open extend EOC valve 2 position N C Chilled water valve open extend F amp BP damper close to face exte Chilled water valve close retract Not used Chilled water valve close retract M M M M M M M M F amp BP damper open to face retract Outside air damper open Outside air damper close Not used F amp BP damper close to face extend Electric heat stage 1 Electric heat stage 1 Not used F amp BP damper open to face retract Electric heat stage 2 Electric heat stage 2 Not used Not used Electric heat stage 3 S S S SE E E E SE S S E E Electric heat stage 3 Exhaust fan relay or aux
84. ve UVC and its master the alarm will be indicated at the slave and the affected units will continue operating For further information refer to the description of the master slave communication type in the Factory Configured Options section of this manual Change Filter Network Units Only When the unit ventilator fan run time exceeds a network adjustable setpoint a change filter alarm is indicated locally and over the MicroTech network Factory Configured O ptions In addition to the various heating and cooling options the AAF HermanNelson product line provides several factory configured options that affect installation requirements and unit control These options are either factory programmed factory wired or both The model number code string specifies which options are present in a particular unit ventilator The following options are described in this section Communication type stand alone master slave or network ASHRAE cycle II Room temperature sensor unit or wall mounted Tenant override unit or wall mounted Remote room setpoint adjustment Day night changeover Ventilation lockout Exhaust fan interlock Communication Type All Unit Ventilator Controllers can be programmed to operate in one of the following communication modes Stand alone Master slave MicroTech network Stand alone A stand alone UVC does not communicate over a network It is independent and capable of performing c
85. xed preprogrammed parameters to maintain unit control Many of the preprogrammed parameters can be adjusted with a PC equipped with Monitor software Setpoint Adjustment Potentiometers There are three setpoint adjustment potentiometers pots on the UVC Minimum outdoor air damper position pot Heating setpoint pot Unoccupied offset adjustment pot Note On slave and network controllers these three setpoint values are received via network communications and the pot settings are ignored On slave controllers only the pot settings are used when communications are lost Therefore it is recommended that appropriate default pot settings be set for slave units Minimum Outdoor Air Damper Position Pot The minimum position pot defines the minimum outdoor air OA damper position The OA damper is typically held at its minimum position when cooling is not required or when the OA temperature is not suitable for free cooling Refer to the sequence of operation document provided with your unit for more detailed information Heating Setpoint Pot The heating setpoint pot adjusts both the occupied cooling and heating setpoints The room occupied heating setpoint is shown on the UVC faceplate The room occupied cooling setpoint is calculated by adding the deadband value to the heating setpoint deadband default 6 F Unoccupied Offset Adjustment Pot The unoccupied offset pot sets the offset value used to deter mine the unoccupied
86. y connect a 9 pin serial PC port to Port A on a MicroTech controller is P N 057186802 which will contain cables P N 067784501 and P N 067784503 The DOS Monitor program may also be used to perform these setup procedures Points to keep in mind about Master Slave Units Master Slave controllers must be either all MicroTech 125 or all MicroTech 325 you cannot mix 125 s with 325 s and vice versa Master Slave networks that have both new and old EOS version MicroTech 325 controllers must use a new EOS controller for the Master new EOS 325 controllers are labeled 21 169 or 21 A9 all other 325 s are old EOS Master Slave controllers both use the same program UV M COD All units are shipped as stand alone units Master Slave code must be downloaded and then Master Slave configu ration performed Slave UVC s are considered to be independent slaves this means that Slave UVC s obtain their setpoints from the Mas ter UVC but the Slave UVC s then operate based upon their own sensors Port A on a Master UVC unit will not communicate as you may expect a stand alone UVC to communicate If you must connect directly with a Master UVC you must first set its HEX network address switches to FF then cycle power The address to use in the Monitor program would then be 00 FF While the HEX network address switches are set at FF the Master UVC will not communicate with the Slave UVC s properly therefore you must remember to r
87. y faults have lower fault code blink counts see Table 9 If more than one Table 9 Alarm and Fault Code Summary Status LED Blinks Priority Alarm Description Trigger Fault Room Temperature Sensor Failure Software Diagnostics amp Service fault is present at a time the status LED will indicate the one with the highest priority As the higher priority faults are cleared the lower priority faults will be indicated The UVC will simultaneously respond to multiple faults with the appropriate control actions If the programmed control actions of multiple faults are contradictory the higher priority fault actions will occur For example assume that the 5 blink low water coil temperature and 7 blink heating valve position feedback failure faults exist concurrently When the feedback failure fault occurs UVC control of the heating valve outputs is programmed to cease the valve would then hold its position When the low coil temperature fault occurs the heating valve is programmed to modulate to 25 open In this situation the 5 blink low coil temperature alarm has higher priority Therefore the heating valve will be opened Since there is no reliable feedback the valve could possibly open past the 25 setpoint Clearing Faults Before any fault can be cleared the alarm conditions that caused it must have returned to normal When the alarm conditions are gone a fault may be cleared either automatically or m

IM 613-1: Unit Vent MicroTech Controller - 348KB

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