IM 660-1 MicoTech/Network Controls Water Source Heat Pump
Contents
1. In addition to the various heating and cooling options the water source heat pump product line provides several factory configured options that affect installation requirements and unitcontrol These options can befactory programmed and factory wired Factory installation and wiring canaccommodate only one option at a time The model number code string specifles which options are present in a particular water source heat pump Field installation will allow all four options simulta neously utilizing an auxiliary module The following options are described in this section Boilerless System Relay Motorized Valve Relay Fresh Air Damper Relay Timed Output Relay Boilerless system relay Relay receives loop water temperature input from MicroTech Loop Water Controllerthrough the gateway panel and provides relay output to electric heat on a call for heat after loop temperature falls Motorized valve relay Relay provides relay output to motorized valve to shut off water through the unit when compressor is not operating Fresh air damper relay Provides relay output to open damper whenever the fan is operating in the occupied cycle Page 4 IM 66 1 Timed output relay Provides relay output auxiliary load to control its operation based onaspecific time schedule differentf rom thatofthe heat pump unit MicroTech network A varlety of MicroTech unit and auxiliary controllers can be interconnected to form a MicroTech networ2. Low pressure The Low Pressure fault is an indication that the low pressure switch input J 4 11 sensed an open circuit while the controller was calling for the compressor to run Thelow pressure switch willopen when the temperature falls below its setpoint Refer to Test Procedures in the Service Information section of this manual for information on trouble shooting digital input faults Effects e Compressor immediately de energized by software e Normal unit operation disabled until manual correction and reset of fault condition Condensate overflow The Condensate Overflow fault is an indication that the condensate overflow sensor J 4 14 sensed a grounded signal while the controller was calling for the compressor to run Refer to Test Procedures in the Service Information section of this manualforinformation ontroubleshooting analog input faults Effects e Compressor immediately de energized by software e Normal unit operation disabled until manual correction and reset of fault condition Brownout The Brownout faultindicates thatthe watersource heat pump is sensing low voltage levels Itis a safety intended to protectthe compressorand contactors from low line voltage or brownout conditions The controller is programmed with a brownout setpoint that corresponds to 8296 of the water source heat pump s name plate line voltage value Ifthe watersource heat pump controller senses a voltage leve
3. Pre Start Required tools and literature The following tools and additional literature may be required to properly commission a MicroTech Water Source Heat P ump Controller Tools e Digital voltmeter Digital ohmmeter Digital thermometer General technician s tools PC equipped with Monitor software NetworkWaterS ource Heat Pumps only Literature e Model specific water source heat pump installation bulletin see Table 1 e Program specific sequence of operation bulletin e MicroTech Monitor Program User s Manual if PC is used Water source heat pump identification Although the water source heat pumps look similar there are significant intemal differences which are defined by the model number code string In additionto 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 IM 660 1 Page 5 Obviously it is extremely important that the correct water source heat pump be placed in the correct location in accor dance with job requirements Proper water source heat pump location should have been determined during the installation process Nevertheless proper location must be verified during the commissioning process Field wiring check The water source heat pump factory configured options deter mine the low voltage field wiring requirements If a
4. fault conditions Each new MicroTech WSHP controller is factory wired and factory programmed The controller is capable of complete stand alone unit control if desired or can be incorporated into a MicroTech network using a MicroTech gateway panel This new controller utilizes LonWorks technology the technology geared toward total interoperability of products among different manufacturers This innovative technology allows the utilization of a central LonWorks based building control system capable of communicating with all internal building systems The controller s intelligence code written in the Neuron C programming language is contained within an on board Neuron chip Component Data Microprocessor The new MicroTechWSHP unit controller is a preprogrammed microprocessor containing the software required to monitor and control the unit The controller supports a minimum of 6 analog inputs 4 digital inputs and 5 digital outputs including the LED All electrical connections to the board are provided by three mass termination style headers Two of the headers are designated strictly for factory wiring the other for a field wiring harness which terminates to a screw type terminal strip on the unit s exterior The controller uses field adjustable setpoints and fixed preprogrammed parameters to maintain unit control many of the preprogrammed parameters can be adjusted with a PC equipped with Monitor software on network units S
5. faults Brownout fault Microprocessor problems Thestatus LED indications canaid in WSHP controller diagnos tics Status LED Approximately 40 seconds after power is applied to the WSHP the status LED should illuminate as shown in Table 2 If the LED fails to respond properly either there is a software problem orthe WSHP controller is defective Power supply problems The WSHP controller requires a 24 VAC power supply It is connected to the board at the section labeled 24V GND and 24VAC terminais J 4 1 and J 4 2 Refer to the unit wiring diagram If a problem with the WSHP controller power supply is suspected check the following 1 Verify that the main power switch is at On 2 Check the voltage at the secondary of transformer It should be approximately 24 VAC load dependent IM 660 1 Page 9 Erroneous temperature readings If it is suspected that the WSHP controller is operating using erroneous temperature data the following procedure may be used to check the sensors 1 Measure the temperature at the suspect sensor using an accurate thermometer 2 Determine the sensor s analog input number Refer to the unit wiring diagram orto the input output tables Table 8 3 Remove the connector from its WSHP controller terminals and measure the resistance of the sensor through the sensor connections Using the thermistor chart Table 9 compare this value with the measured temperature If the measured res
6. specific option is present on a particular water source heat pump as denoted by the model number the associated field wiring if any must be checked A unit wiring diagram is provided with each unit shipped along with a modelspecific Installation and Maintenance Guide Referring to this literature and using the following checklists the start up technician should thoroughly check the electrical in stallation before the commissioning process proceeds Wall sensor packages 1 Check that the cable is twisted shielded with drain wire Belden 8729 or equivalent 22GA 2 Check that four 4 conductors are available 3 Check that the conductors have been terminated at the unit and the wall sensor package to screw terminal board 1 in Table 3 Network WSHP default setpoints and adjustability accordance withthe field wiring diagram on which terminals are clearly labeled Terminal 4 is used for both the room sensor common and the shield wire 4 Check that the cable length between the wall sensor pack age and its water source heat pump controller does not exceed 260 feet MicroTech network communications units 1 Check that the cable is a twisted unshielded pair of copper strand conductors 2 Check thatthe conductors have been terminated at the units to terminals 5 and 6 of Terminal Board 1 in accordance with the field wiring diagram 3 Check that the conductors have been terminated at the MicroTech gateway panelin a
7. Installation amp Maintenance Data Group WSHP Part Number 106018961 MicroTech Water Source Heat Pump Unit Controller Date May 1999 Contents Introduction co eh ed teo beret 2 Pre Start iusso perder e rrt decide 5 6 General Description senes 3 Start Up centre een ro dene rc 6 7 Component Data sssseeeememe enn 3 Diagnostics and Service sssseseee 7 8 Standard Control Features sse 3 4 Service Information 9 Factory Configured Options sse 4 5 Test Procedures sse 9 11 Commissioning eterne ten tte 5 1999 AAF M cQuay Incorporated IM 660 1 Rev 5 99 Introduction This manual in conjunction with the Operation amp Maintenance Table 1 Model specific water source heat pump Manual provides information about the new MicroTech Water installation literature Source Heat Pump WSHP controller and control system used INSTALLATION amp in the AAF M cQuay Incorporated WSHP product lines The WSHP UNIT MODEL MAINTENANCE DATA manual describes the controllers components input output BULLETIN NUMBER configurations and service procedures CCH HWH 007 120 For network installation or commissioning instructions refer CCH HWH 006 060 to the Operation amp Maintenance manual for the MicroTech FCV VWH 007 060 gateway panel For general information on a particular WSHP LHP VWH 07 27 unit refe
8. WSHP controller senses the AC voltage atthe power input section terminais J 4 1 and J 4 2 see unit wiring diagram If the voltage at these terminals is less than 19 68VAC for atleast 1 second the brownout fault will occur The fault will automati cally clear if the voltage at the terminals remains greater than 21 6 VAC for atleast 1 second Ifa brownoutfaultoccurs checkthe line voltage to the water source heat pump If itis less than 8296 of the nameplate value contactthe power company Ifthe line voltage remains greater than 9096 ofthe nameplate value formore than 1 second butthe fault does not reset perform the following procedure 1 Measurethevoltage between terminais J 4 1 and 4 2 onthe WSHP controller If the voltage is unacceptably low or fluctuates around 19 68 VAC the WSHP controller is functioning properly Go on to step 2 If the voltage remains above 21 6 VAC for 1 second but the fault does not reset the WSHP controller is defective 2 Checkthe primary and secondary voltages of power supply transformers 3 Checkforfaulty wiring orconnections throughoutthe power supply circuit WSHP controller replacement Data relating to the water source heat pump controller configuration and characteristics are stored at the factory when each unit is built and tested If a WSHP controller is defective and must be replaced its unit specific software defined by the above data must be loaded into the replace ment controller at t
9. anel trunk must have a unique address Press and hold the tenant override switch for at least 10 seconds or press and release the service pin at each individual heat pump to requestthe assignment of the next sequential address from the MicroTech gateway panel 3 Check the status LED The status LED should illuminate 30 to 40 seconds after power up If a wall sensor package is used the remote status LED should also illuminate 4 Verify that network communications between the water source heat pump and the MicroTech gateway panel have initiated Atthe network PC change the operating mode to unoc cupied and checkthatthe status LED responds accordingly Forfurther information on verifying communications referto the MicroTech Monitor P rogram User s Manual 5 Verify that the water source heat pump is operating in accordance with its sequence of operation as outlined in the appropriate documentation Since the sensed temperatures are fixed at any given moment adjust the water source heat pump heating and cooling setpoints atthe network P C to obtain the expected heating or cooling control actions Adjust any other applicable parameters to obtain the expected water source heat pump control actions 6 Check that any desired network executed control features are working properly load shed etc 7 Review the submittal drawings and make any necessary changes to the default water source heat pump setpoints and parameters 8 C
10. ating setpoint Unoccupied cooling setpoint cannot be lower than low warning setpoint Occupied cooling setpoint cannot be lower than unoccupied cooling setpoint GOccupied heating and occupied cooling setpoints must differ by at least the differential Start Up Following are WSHP start up procedures foreach communica PC access tion type The start up procedure must be performed by a qualified technician for every WSHP on a job Connections for network wiring are made atterminals 5 and 6 of Terminal Board 1 The FTT 10 free topology transceiver on the MicroTech WSHP Controller is polarity insensitive thus polarity issues need not be addressed Stand alone Becausestand alonecontrollers areindependentofeach other they may be started in any order Page 6 IM 66 1 APC cannotbe used forstand alone WSHP start up however the start up process will be easier and faster if a PC and MicroTech Network are used If a PC is used it must be equipped with Monitor software Forfurtherinformation refer to PC Connection in the Service Information section of this manual Procedures for each stand alone WSHP 1 Apply powerto the unit Turn the main power switch to On 2 Check the status LED and operating mode changeover devices The status LED should illuminate 30 to 40 seconds after power up If a wall sensor package is used the remote status LED should also illuminate Referring to Table 2 verify that the tenant override
11. cal charge by touching the bare metal inside the main control panel before performing any service work Never unplug cables circuit board terminal blocks relay modules or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications Ithas been tested and found to comply with the limits fora Class B digital device pursuant to part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof Page 2 IM 66 1 General Description The new MicroTech WSHP controller is a control system designed to provide control of McQuay and AAF water source heat pumps The controller enables the mode of operation monitors the water and air temperatures and indicates
12. ccordance with the field wiring diagram supplied with the panel Setpoint initialization network units The Water Source Heat Pump 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 WSHP will use the default factory set setpoints shown in Table 3 DESCRIPTION FACTORY PROGRAMMED SETPOINT ADJ USTABILITY RANGE Occupied Heating Setpoint 70 F 21 C 35 120 F 1 7 49 C 99 Occupied Cooling Setpoint 74 F 23 C 35 120 F 1 79 49 C 88 Fan Occupied On On Cycle Heat Cycle Cool On Unoccupied Heating Setpoint 60 F 16 C 35 120 F 1 7 49 C Unoccupied Cooling Setpoint 85 F 29 C 35 120 F 1 7 49 C Fan Unoccupied Cycle On Cycle Tenant Override 1st press 1 00 Off 0 30 8 00 Tenant Override 2nd press Off Off 0 30 8 00 Differential 2 F 1 2 C 1 10 F 0 6 5 6 C Auto Manual Auto Manual occupied unoccupied fan only off Next Filter Change hours 600 100 5000 Clock Schedule 1 up to 32 Load Shed Start Level Off Off 1 to7 Tenant Setpoint Adjustment Off 0 F 0 C Off On 3 F 1 7 C Low Temperature Waming 55 F 13 C 35 F 1 7 C high not used High Temperature Warning 95 F 35 C low not used 120 F 49 C Unoccupied heating setpoint cannot exceed high warning setpoint Occupied heating setpoint cannot exceed unoccupied he
13. dth Modulation Table 7 TYPE AC RMS CURRENT DESCRIPTION RATING E M Pilot Duty Relay 9 300 ma AC SPST N 0 contacts E M Pilot Duty Relay 9 300 ma AC SPST N O contacts E M Pilot Duty Relay or SS Random tum on Triac 600 ma AC SPST N O contacts Fan Contactor Compressor Contactor Reversing Valve Solenoid Leaving Water Temp Sensor Lvg Water Line Condensate Drain Pan On Board Remote Basic Wall Sensor Remote Wall Sensor Condensate Overflow Sensor Brown Out supply voltage Sensor Room Air Temp Sensor Tenant Override S etpoint Adjust Digital inputs The water source heat pump controller has four standard digital inputs Digital input conditioning includes RC filtering with a time constant of at least 4 7 milliseconds The base module provides additional filtering using software filtering techniques On Board Status LED Yellow DC sourced signal current limited to 10 ma DC E M Pilot Duty Relay 9 600 ma AC J umper selectable isolated or 24VAC sourced SPDT contacts Off Board Status LED Multi Purpose Spare Isolated E M Contacts Inputloutput tables All WSHP controller input and output connections and their corresponding watersource heatpump components areshown in Table 8 page 11 Test Procedures This section contains troubleshooting procedures for the following e Microprocessor problems Power supply problems Erroneous temperature readings Digital input
14. e network regardless of whether power is cycled Wall mounted sensor There are four optional wall sensor packages avallable All wall sensors include a remote status LED and tenant override button Setpoint adjustment and thermometer are optional wall sensorfeatures that are available in addition to the basic sensor The wall mounted sensor must be field installed and field wired to the water source heat pump Terminal Board 1 provides the connections for all room temperature sensor field wiring Refer to the unit wiring diagram provided and to Bulletin No IM 529 MicroTech Room Temperature Sensors for infor mation on wall sensor package installation Remote room setpoint adjustment The remote setpoint adjustment potentiometerallows the room setpoint to be adjusted up or down by as much as 3 F 1 7 C Itis available with several ofthe optional wall sensor packages Tenant override A wall mounted tenant override switch is available for use with all MicroTech WSHP unit controllers A single press ofthe tenantoverride button lasting 1 0 to 6 0 seconds provides a momentary contact closure that causes the unit to enter the tenant override operating mode fora settime period default 60 minutes Except for the fact that it is temporary tenant override operating mode is identical to the occupied operating mode Pressing and holding the tenant override button for at least 6 0 seconds but not more than 10 0 seconds will activa
15. ended e 144 MB 3 floppy disk drive e Bus mouse card and mouse e RS 232C serial communications port e Parallel printer port e Printer that supports Windows version 3 1 e Optional 2400 Baud internal modem 9600 Baud recommended e DOS 5 0 or higher e Windows 3 1 or higher e MicroTech Monitor software Analog inputs The MicroTech WSHP unit controller has six standard analog inputs The controller can sense temperatures in the range of O F to 158 F 70 C to 70 C Table 5 DESCRIPTION LOCATION Discharge Air Temp Sensor Inlet to Fan The digital inputs sense the presence or absence of an extemal 24 VAC 2096 power source with a minimum of 10 ma AC current flowing through the following isolated contacts Table 6 DESCRIPTION LOCATION Refrigerant High P ressure N C HP Switch Refrigerant Low Pressure N C LP Switch Refrigerant Low Temp N C LT Switch Remote Start Stop N O Remote Switch Refer to the wiring diagram supplied with your unit for specific wiring details Digital outputs Ail digital outputs with the exception of the on board and offboard status LEDs are capable of controlling electrome chanical or solid state relays which switch inductive loads 9 24VAC 20 0 4 pF steady state AC RMS currents listed below assuming 10x single cycle surge currents on initial turn on The on board and off board status LEDs are controlled by one ofthe Neuron s I 0 pins capable of Pulse Wi
16. he factory To do this the factory needs the following information Full model number Serial number Date code for time of manufacture Software version of code loaded in controller The unit model and serial numbers are listed on the unit dataplate The date code and software version of code are printed onthe MicroTech unitcontroller adhesive backed label This information must be included with the replacement WSHP controller part order Table 8 Inputs and outputs for WSHP units Table 9 Thertnistor chart CONNECTION COMPONENT DESCRIPTION J1 1 TB 2 E Remote Digital Source J1 2 TB 2 L Remote Digital Signal J1 3 TB 2 U Spare Relay Normally Closed J 1 4 TB 2 P Spare Relay Common J 1 5 TB 2 C Spare Relay Normally Open J 2 6 TB 1 1 Room Sensor LED J 2 7 TB 1 2 Tenant Override J 2 8 TB 1 3 Room Sensor Input J 2 9 TB 1 4 Room Sensor Common J 2 10 TB 1 5 Lon Talk Connection J 2 11 TB 1 6 Lon Talk Connection J 2 12 TB 1 7 24 VAC Common J4 1 24 V Ground J 4 2 24 VAC 4 3 Fan Relay Output J4 4 Fan Relay Common 4 5 Compressor Contactor Output 4 6 Compressor Contactor Common 4 7 Reversing Valve Solenoid Output J4 8 Reversing Valve Solenoid Common J4 9 High Pressure Switch Signal J4 10 Low Pressure Switch Source J 4 11 Low Pressure Switch Signal J 4 12 Low Temperature Switch Signal 4 13 Low Temperature Switch Source J 4 14 Condensate Overflow Sensor 5 8 Leaving Water Temperature Sensor Input J5 9 Leaving Water Tempe
17. heckthatthefan interlock feature works properly Ifthe unit is heating or cooling the fan will be on Ifthe compressor is running the fan will be on In the unoccupied mode if the fan occupied setpoint is on the fan will always be on If the setpoint is heat cycle cool on the fan will cycle with the compressor in heating and be on continuously in cooling Diagnostic Service Unit identification Wink command Upon receiving a Wink command from a network manage mentnode theheatpump will exhibitthefollowing identification sequence LED and fan sequences occur simultaneously LED Flashes on 0 5 sec off 0 5 sec for 15 seconds Fan The heatpump fan will turn offfor5 seconds turn onfor 5 seconds then off again for 5 seconds The Wink action will disrupt unit operation The compres sor will shut off during this period and the minimum off timer must expire before the compressor will be allowed to run again This function allows verification of an individual unit network address without a need to open the unit access panels Alarm monitoring amp control The Water Source Heat Pump Controller is programmed to monitor the water source heat pump for specific alarm condi tions that may occur on the various model types If an alarm condition exists and is detected by the controller a fault will occur The water source heat pump controller will indicate the fault and execute appropriate control actions for the alarm condition
18. igh pressure switch input J 4 9 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 J 4 5 and the compressor relay coil Therefore if a high pressure condition occurs the compressor willbe immediately shut down by the switch then unit operation willbe disabled by the WSHP controller software Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults Effects as applicable e Compressor immediately de energized e Normal unit operation disabled by software until manual correction and reset of fault condition Low temperature The Low Temperature fault is an indication that the low temperature switch input J 4 12 sensed an open circuit while the controller was calling for the compressor to run The low temperature switch will open when the temperature falls below its setpoint model and size dependent Refer to Test Procedures in the Service Information section of this manual for information on troubleshooting digital input faults Effects e Unit will fail safe to cooling for sixty 60 seconds for coil defrost e After sixty 60 seconds in cooling compressor and fan immediately de energized by software e Normal unit operation disabled by software until manual correction and reset of fault condition Page 8 IM 66 1
19. istance and temperature match the WSHP controller may require factory service or it may be defective If the measured resistance and temperature do not match elther there is a wiring problem or the sensor is defective Check the wiring connection and the sensor circuit wiring for defects Digital input faults Usually a digital input fault is caused by high pressure low pressure or low temperature alarrn conditions that are due to mechanical problems in the water source heat pump However this type of fault could also be caused by a problern in the digital input circuit Following is a procedure that may be used to check for problems 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 WSHP 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 WSHP Controller 1 Check the voltage at the secondary of transformer it should be approximately 24 VAC 2 Determine the switch s digital input number Referto the unit wiring diagram or to the input output tables Table 8 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 switches are normally closed Page 10 M 66 1 Brownout fault The
20. k A MicroTech network provides a building operator with the capability to perform advanced equipmentcontrol and monitoring from a PC equipped with Monitor software at a central or remote loca tion All control sequencing stop start and safety monitoring is displayed onthePC screen withthefollowing unique values and parameters for each unit e Return air and discharge air temperatures e Compressor fan and reversing valve status e High pressure low temperature brownout and drain pan status e Occupied and unoccupied heat and cool setpoints Auto manual and occupied unoccupied fan control e Mode fault system schedule and setpoint operation e Compressor starts and fan run hours e Load shed level and tenant override In addition the following unique operation and maintenance parameters can be displayed for each unit e Leaving water temperature e Return air temperature setpoint adjustment Adaptive optimal start Occupied unoccupied on cycle fan mode Room temperature warning Filter changes from fan hours Compressor management On off differential minimum off time maximum cycle Communication Fallure fthe M icroTech network commu nication link fails for any reason the affected WSHP controller 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 minimum position heating and cooling setpoints will be those last received over th
21. l less than its setpoint for more than 1 second it will trigger the brownout fault The fault will reset automatically when the sensed voltage remains at or above a level corresponding to 9096 ofthe nameplate value for a period of 1 second Forinformation on troubleshooting this alarm refer to Test Procedures in the Service Information section of this manual Effects as applicable e Compressor is immediately de energized Change fliter network units only The Change Filter notification indicates that the fan has operated longer than the set number of hours Typically this warning is used to alert the building operator of the need to replace the filter To clear the notification the filter timer must be reset at the network PC Effect An alarm message that identifies the water source heat pump network address and time of occurrence will be sent to the network printer Service Information PC specification A personal computer may be used for monitoring network unit operation changing setpoints trend logging downloading software and diagnostics The P C mustbe an IBM or100 true compatible with the following features minimum requirements e 486SX CPU Central Processing Unit e 640 KB base RAM Random Access Memory e 4MB extended RAM 8 MB recommended e 40 MB hard drive 200 MB recommended e VGA card and monitor SVGA recommended color recommended e 640 x 480 resolution 800 x 600 resolution recomm
22. llowing events IM 660 1 Page 3 Unit power up Unoccupied to occupied changeover Brownout condition The compressorstart delay can be from 180 to 243 seconds assuming a default initial delay of 180 seconds and is deter mined by the unique 48 bit unit ID Delayed reversing valve de energization All water source heat pump units have a 10 second reversing valve de energization delay feature to prevent swishing This delay prevents the reversing valve from returning to its normal cooling position for a period of approximately 10 seconds after the compressor is re energized when the unit is in the heating mode If necessary an alarm condition can override the delay timer and de energize the reversing valve with the compressor Condensate overflow alarm Should a condensate overflow alarm be detected the unit controllerwill immediately disable the compressor Once the overflow alarm disappears the unit controller will automatically reset the WSHP unit The condensate overflow sensor is an exposed ring terminal located in the condensate drain pan The condensate overflow alarm will occur only when the unit is in cooling mode Brownout alarm The on board brownout feature is meant to protect the com pressor contactors from low voltage or brownout conditions If the supply voltage to the water source heat pumps is below 8296 ofthe nameplate value the WSHP controller will detect it indicate it and de energize the com
23. option is working properly Do this by pressing the tenant override switch on the wall sensor if present and observing the status LED 3 Verify that the water source heat pump is operating in accordance with its sequence of operation as outlined in the appropriate documentation Network Prior to the start up of any Network Water Source Heat Pump Controllers the following MicroTech network devices must be commissioned IBM compatible PC with Monitor software MicroTech gateway panel Refer to the literature supplied with these products for information on installing and commissioning them After these devices have been properly commissioned the network water source heat pumps may be started in any order However if the start up order follows the daisy chain from one watersource heat pump to the next itwilibe easierto detectany wiring problems that may exist in the communications trunk Communications cable check Perform this check for every communications trunk connected to a MicroTech gateway panel 1 Be sure that the network communication connectors are disconnected at every water source heat pump on thetrunk 2 Using an ohmmeter check that there are no shorts between any two connectors in the communications trunk Procedures for each network water source heat pump 1 Apply powerto the unit Turn the main power switch to On 2 Setthe network address Each water source heat pump on a MicroTech gateway p
24. or is located at the inlet to the fan The leaving water temperature sensor is located in the leaving water line Standard Control Features The following are standard MicroTech WSHP control features as applicable to the various water source heat pump model types e Control heating and cooling from a room sensor e Monitor all safety controls e Provide fan and compressor operation e Monitor discharge air temperature e Monitor leaving water temperature e Provide status of all vital unit functions e Provide optional control outputs Control heating and cooling from a room sensor All water source heat pumps are designed to control the room or zone temperature in response to space temperature detected by the room temperature sensor Compressor short cycle protection All water source heat pumps include compressor short cycle protection When a compressoris energized it will remain energized for atleast 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 Whena compressoris de energized it will remain de energized for atleast 5 minutes before the temperature control sequence will be allowed to energize it again Random start A random start feature is provided with all water source heat pumps This feature will prevent simultaneous compressor start up that could otherwise occur after the fo
25. pressor Upon rectification ofthe brownout condition when supply voltage remains above 9096 of nameplate normal unit operation will resume High pressure refrigerant alarm If excessive pressure in the refrigeration circuit is detected by the high pressure switch the compressor and reversing valve will be de energized immediately Should the high pressure alarm disappear the unit controller must be manually reset by disconnecting and reconnecting power to the unit Low temperature refrigerant alarm Upon detection of a low temperature refrigerant alarm the unit controller will immediately putthe reversing valve in the cooling position for sixty 60 seconds After sixty 60 seconds the compressor will be disabled Should the low temperature alarm disappear the unitcontroller mustbe manually resetby discon necting and reconnecting power to the unit The low tempera ture alarm will occur only when the unit is in heating mode Low pressure refrigerant alarm Upon detection of a low pressure refrigerant alarm the unit controller will immediately disable the compressor Should the low pressure alarm disappear the unit controller must be manually resetby disconnecting and reconnecting powerto the unit Change filter network units only When the water source heat pump fan run time exceeds a network adjustable setpoint a change filter notification is indi cated locally and over the MicroTech network Factory Configured Options
26. r to the model specific Installation Manual see WMH CWH 007 019 Table 1 CCW 019 060 50 Hz only WARNING Electric shock hazard Can cause personal injury or equipment damage This equipment must be properly grounded Connections and service to the new MicroTech WSHP controller control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled WARNING Excessive moisture in the control panel can cause hazardous working conditions and improper equipment operation When servicing this equipment during rainy weather or high humidity conditions the electrical components in the main control panel must be protected ACAUTION Extreme temperature hazard Can cause damage to system components The controller is designed to operate in ambient temperatures from 32 F to 140 F O C to 60 C and in relative humidity up to 95 noncondensing The controller can be stored in ambient temperatures from 40 F to 176 F 40 C to 80 C and in relative humidity up to 95 noncondensing A WARNING Ifthe watersource heat pump is to be used for temporary heating or cooling the unit must first be properly commissioned Failure to comply with this requirement will void the warranty AN CAUTION Static sensitive components Astatic discharge while handling electronic circuit boards can cause damage to the components Discharge any static electri
27. rature Sensor Common J 5 10 Discharge Air Temperature Sensor Input J 5 11 Discharge Air Temperature Sensor Common J 6 1 7 Auxiliary Module Connections WO CO SI D U1 A wj N e m e m um m N m Ww m A m ul m o m N m co m Ke N e N me N N N Ww N A2 N ul N o N N IM 660 1 Page 11 AAF McQuay Incorporated 4900 Technology Park Boulevard Auburn NY 13201 9030 USA 315 253 2771 1999 AAF McQuay Incorporated e Printed on recycled paper containing at least 1096 post consumer material IM 660 1 Rev 5 99
28. s Fault code interpretation Water source heat pump faults are indicated at the status LED on board orremote Ifa fault exists operating mode indication will be replaced by a fault indication During afaultcondition the LED is constantly flashing on 0 1 sec off 0 1 sec until the fault is cleared 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 manually IM 660 1 Page 7 Anauto 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 controller Note The cause of a manual reset fault should be investi gated and eliminated before the unitis placed back into service Alarm descriptions Following are descriptions of the various faults listed in Table 4 and the low temperature fault Table 4 Alarm and fault code summary ALARM FAULT DESCRIPTION TRIGGER FACTORY SETTING RESET Fault Clear Opens at 395 10 psig Closes at 250 25 psig Opens et 7 3 psig Closes at 22 7 psig Conductivity trip point 2 5 microohms Line Voltage 82 of Nameplate Voltage Hardware Manual High Pressure Low Pressure Hardware Manual Condensate Overflow Manual Hardware Brownout Software Auto High pressure The High Pressure faultis an indication thatthe h
29. tatus LED An amber on board status LED aids in diagnostics by indicat ing the water source heat pump operating mode and alarm conditions If there are no currentalarrn conditions the LED will indicate the unit operating mode as shown in Table 2 For more information on alarms referto the Alarm Monitoring amp Control section on page 7 ofthis manual A remote status LED is provided with all optional wall mounted temperature sensor packages It has the same function as the on board status LED If used the remote LED is connected to the new MicroTech WSHP controller at connec tion 1 on Terminal Board 1 Table 2 Status LED indication STATUS LED STATE Mob On Continually Occupied Occupied Load Shed On 0 5 sec Off 5 5 sec Unoccupied On 5 5 sec Off 0 5 sec Tenant Override Override Load Shed Alarm Condition Condensate Overflow Brownout Compressor Fault On 0 1 sec Off 0 1 sec Iftheunitcontrollerhas notbeen assigned a logical address the intensity of the LED is low If a logical address has been assigned the LED intensity is high Temperature sensing The MicroTech WSHP unit controller uses negative tempera ture coefficient NTC thermistors for temperature sensing A thermistor chart which provides voltage to temperature and resistance to temperature conversion data is included in the Service Information section ofthis manual Table 9 page 11 The discharge air temperature sens
30. te the network query address mode indicating the unit address in question at the MicroTech gateway panel Pressing and holding the tenant override button for greater than 10 0 seconds will activate the network self configure mode requesting the assignment of the next sequential ad dress from the MicroTech gateway panel Commissioning ZNWARNING Electrical Shock Hazard Could cause severe injury or death Fallure to bond the frame ofthis equipmentto 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 prodcedures pertain to water source heat pumps equipped with the MicroTech Water Source Heat Pump Controller These procedures must be performed in addition to the mechanical and electrical system commissioning proceedures that are outlined in the model specific installation literature listing provided in Table 1 Caution B efore power is applied to any unit the pre start procedures in the model specific installation literature must be closely followed A large part ofthe commissioned procedure is ensuring that the water source heat pump operates according to its pro grammed sequence of operation The water source heat pump sequences of operation are described in the Operation and Maintenance Manual for the MicroTech Water Source Heat Pump Unit Controller
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