026-1706 - Emerson Climate Technologies
Contents
1. UP POSITION Figure 2 8 Enable Battery Jumper on MultiFlex Board Mounting and Powering 7 3 The I O Network Although the MultiFlex RTU can operate as a Stand alone controller it relies on an Einstein or REFLECS unit for advanced features such as remote dial in dial out logging and alarm con trol All MultiFlex boards and controllers use an RS485 network connection to communicate with Einstein and REFLECS site controllers Techni cians who are familiar with CPC s previous gen eration 16AI 810 and ARTC boards will find the network setup procedure for the MultiFlex RTU boards to be very much the same 3 1 Wiring Types CPC specs Belden 8641 shielded twisted pair cables for use as I O network wiring or Belden 82641 and Belden 88641 for plenum installations If the recommended cable is not available in your area be sure the wiring meets or exceeds the following specs Conductor Type Twisted Pair Capacitance between 31 pF ft or less signal wires Capacitance between 59 pF ft or less signal and shield Nominal Impedance 1200 500 Table 3 1 RS485 I O Network Wiring Specifications 3 1 1 Daisy Chains The RS485 Input Output 1 0 network con nects all input and output communication boards together in a single open communications loop This loop or daisy chain connects the Ein stein or REFLECS to multiple input and output 8 MultiFlex RTU Operator2. io o O O O 5 ZE LA gt A gt gt lB fr g 8 Jo 20 jD lo Ja ela 1 Bo i S jo 9 Es o ee Eo ee Cc Cc to E TWORK m bo e _ ba l Jo El J l Je a J l 5 El o E o Be 00 Om w IS w m E JO Emm Emo Emo mO e ae Foe pl Po f H F R RE 5 4 e5 See Eee LE PP Bee E Pas A a AS AS a E E Soe a S Oe a OS oS C gt E c j 3 g 3 3 3 g El 3 sE oe l m el e E w 3 ln E m E w E v E w E of w l IO E O pl O 3 lO fl LIO E O E HO 8 S El gt i gt E b gt 3 gt E gt Er gt El bs le S He A i AB ofa 9 1 2 Ju 20 Ja f lc lI lo li we li OE AY i 302 It ta O Ji ja O Blo o a Jz ja a o Al ET ERRE tos Coe Tor Todo Sl f Je f Je f je la f Je le i le le 2 E A 2 2 2 2 2 la HO k o f Fl ba i ia H k Ho k Ho k p Pl Pl Pl i o E lo E ly ll e E E CEO O O mS GCS EE 6 EC O Y E gt Se gt E S El gt E gt E G S Bi J 3 ome 1 Aa ji Bey we mie Ju 20 Ja 20 iS O 6 6 iS o ES E lu i de lw z Jaji z Jaja i Jfa z Jaja z o a lo EP E CS E CaF EAS E f Je Je f Je Je Je Jo Je EJ El ler e Ez lo ig is E SE E eS E gt Pp 1 y 6 a Em E
3. 2 Set the input type dip switch that corre sponds to the point being connected 3 Ifnecessary connect the sensor to one of the SV or 12V power terminals 4 1 3 1 An input point on a MultiFlex board consists of two terminals as shown in Figure 4 2 One of these terminals labeled SIG reads the signal from the sensor while the other labeled Oy is where the sensor s ground and or cable shield wire 1s connected Wiring MULTIFLEX INPUT POINTS Ov SIG INPUT 1 Figure 4 2 Input Board Points 4 1 3 2 Specific wiring types are required for each type of sensor used with Einstein or RMCC Sensor Wiring Types RTU Input and Output Setup 11 All Analog Temperature Sensors and Air Flow Sen sors Temperature and air flow sensors are to be wired with shielded 2 conductor at least 22 GA wire Belden 8761 or equivalent All Pressure Transducers Humidity Sensors and Re frigeration Transducers Pressure and refrigeration transducers and humidity sensors are to be wired with shielded 3 conductor at least 22 GA wire Belden 8771 or equivalent Dew Point and Light Level Sensors These sensors are to be wired with shielded 4 conductor at least 22 GA wire Belden 8729 or equivalent 4 1 3 3 Each MultiFlex input point has an input type dip switch that must be set The input type dip switches for the RTU are on the switch bank labeled S1 Input Type Dip Switches The input typ
4. input type for BCU To set up curtailment in the RTU you must designate which specific heating and cooling stages will be subject to curtailment When the power company sends a curtail command all stages that are set up to be curtailed will be shut off and locked out Fan control is not directly affected by a call for curtailment The rooftop unit fan will still run at a speed based on the number of active non curtailed stages or if using modulated outputs the curtailed modulating percentage If this causes the fan to slow down or shut off during curtailment there will be energy savings from the fans Curtailment 6 7 Reversing Valve Control If reversing valves are used the AHU Zone applica tion will not be allowed to bring on stages of heat to compensate for cool stage activation during dehumidi fication The RTU supports the control of a heat revers ing valve and a cool reversing valve These valves may be wired to any auxiliary output on an RTU The output 1s controlled as follows 1 When no heat or cool stages are active the coil is de energized N C contacts closed N O contacts open 2 When a cool stage comes on the coil will be energized N C contacts open N O contacts closed 3 When a heat stage comes on the coil will be de energized N C contacts closed N O contacts open Therefore in order for the output to control the valve properly heat reversing valves must be wired to
5. mal by moving the cursor to the field and selecting ON OFF or NOR by pressing the dash key When ordering an ON override specify the ON percentage of the output in the Override field Runtime statistics for the fan heating cooling and auxiliary outputs may be cleared using this screen To clear a runtime move the cursor to a field un derneath the output name and press the dash key The letters CL will appear To confirm the runtime reset press ENTER to cancel the runtime reset press the period key Reset Alarms To reset all alarms for this RTU move the cursor to the field next to the Reset Alarms message and press the dash key The letters CL will appear To confirm the alarm reset press ENTER to cancel the runt ime reset press the period key Reset Setpts If desired all RTU set points may be cleared and returned to nor mal default values by moving the cursor to the field next to the Reset Setpts message and pressing the dash key The letters CL will appear To con firm the alarm reset press ENTER to cancel the runtime reset press the pe riod key The MultiFlex RTU Hand Held Interface 27
6. s Guide communication boards and terminates at the last input or output board on the network A diagram of this network arrangement 1s shown in Figure 3 1 CPC eure o INPUT OR OUTPUT BOARD 26513041 Figure 3 1 I O Network Configurations 3 1 2 Network ID Numbers Each device on an RS485 segment has a net work dip switch that must be used to assign the board a unique network ID number The network ID number makes a board unique from other boards on the network of the same type This allows the site controller to find it and communicate with it easily Boards of the same type should be numbered in sequence starting with one and continuing with two three and so forth 026 1706 Rev 1 10 29 02 3 1 2 1 Numbering the MultiFlex RTU The MultiFlex RTU is a unique board type on the RS485 Network by the CPC controllers Each RTU that will be associated with an Ein stein must have a unique number from to 31 which is configured by setting the first five switches on dip switch bank S3 POSITION 6 7 BAUD RATE 9600 or 19200 B ADDRE SS E ADR i EMT A 19200 BAUD 9600 BAUD o o le om co K Ju E e E J E Je Z is AS DS m3 E ml ll jo l Jo
7. END PLUG INTO MULTIFLEX INPUT SOCKET FEMALE END PLUG INPUT CONNECTOR FROM OLD BOARD HERE RIBBON CABLE P N 335 2301 POINT 4 POINT 4 POINT 3 POINT 3 POINT 2 POINT 2 POINT 1 POINT 1 Figure 4 4 MultiFlex Input Adapter Cable 4 1 5 On Board Power Connection If power is needed to operate the sensor four points are provided on the MultiFlex board that supply DC power one 12VDC point and three 5VDC points See Figure 4 5 for the location of these points O 8000 O MEAN Figure 4 5 Input Board Power Sources 026 1706 Rev 1 10 29 02 To connect to one of the DC power sources simply connect the sensor s power wire to one of the terminals 4 1 5 1 Current Ratings for On Board Power Sources The maximum current that may be drawn from the 12VDC terminal is 100 milliamps The maximum current that can be drawn from all three S VDC terminals COMBINED is 50 milliamps 4 1 5 2 Powering Sensors Requiring 24VAC Off the Power Trans former Some sensors that requires 24VAC can be powered off the MultiFlex s own 24VAC power connection To connect to the 24VAC power source connect the sensor s power wires to ter minals AC and AC2 This can only be done with sensors that keep the 24VAC signal isolated from its DC output signal such as CPC s Dew Point Probe If the output signal is not isolated f
8. LED next to the connector your MultiFlex is an old style Multi Flex refer to Section 2 3 2 2 Old Style Multi Flex RTU Boards No Isolated Power Supply tor power wiring instructions 2 3 2 1 New Style MultiFlex RTU Boards with Isolated Power Supply The new style MultiFlex board can be con nected to any of the center tapped transformers mentioned in Table 2 2 provided the OV termi nal of the board is connected to an Earth ground 026 1706 Rev 1 10 29 02 A center tapped transformer may power both center tapped and non center tapped devices at the same time as long as none of the non center tapped MultiFlex boards are old style MultiFlex boards If an old style Multi Flex shares the same center tapped transformer as a device that uses the center tap the old style MultiFlex will be damaged Figure 2 5 shows how to wire a non center tapped device to a cen ter tapped transformer 120 208 240 VAC BROWN HOT BLUE NEUTRAL o Et 240 208 ie AC1 24V CT 120 PRIMARY SIDE SECONDARY SIDE Figure 2 5 Wiring Non Center Tapped MultiFlex Boards to Transformers With a Center Tap In addition the MultiFlex RTU boards can be powered by one of the 5SOVA or 75VA non center tapped transformers listed in Table 2 1 on page 3 Figure 2 6 shows how to wire the trans formers to the MultiFlex boards Poweri
9. ON i is OFF Communi cation Up ON Down OFF Loss of Power Table 4 5 Output Board Fail Safe and Switch Settings when Contact is Wired Normally Closed N C Fail safe Loss OF Switch Communi cation Light Light is ON is OFF Up ON Down OFF State of Normally Open N O Contacts on MultiFlex Relay Points Loss of Power Table 4 6 Output Board Fail Safe and Switch Settings when Contact is Wired Normally Closed N O 4 2 5 Relay Output Ratings and Fuse Protection Each relay output on the MultiFlex Combi nation I O boards is rated for up to 240 VAC with a maximum current of 2 amps Each relay is fused with a 2A fast blow 5mm x 20mm fuse Bussman GMA 2 or equivalent The Outputs RTU Input and Output Setup 15 4 3 Analog Outputs Figure 4 8 MultiFlex RTU Analog Output Locations The MultiFlex RTU analog outputs are 0 10VDC points used for controlling variable position economizers and variable speed fans The maximum output current for each point is 10 milliamps Unlike most of the RTU inputs and outputs the two analog points are not pre defined To enable them for use in economization or fan con trol they must be assigned in the RTU Figure 4 8 shows the location of the analog outputs 4 3 1 Wiring the RTU Analog Out put Points The analog outputs have no hardware based fail safe settings fail safes are set in the board firmware by setting eith
10. Output output ON when economization is Types OK OFF when economization is not OK DEHUM Output for controlling a dehumidi Two position econo fying device mizer or contactor for gt T 4 A pa T analog economizer able 4 4 Auxiliary Output Types Table 4 3 RTU Default Outputs 4 2 3 Wiring Outputs to Points 4 2 2 MultiFlex RTU Auxiliary Out The MultiFlex RTU has Form C relay con put Types tacts Figure 4 7 shows how to wire the three terminal Form C contact Output points 6 and 7 on the RTU board l l l are configurable in the RTU software Table 4 4 One wire of the two wire connection should lists all of the possible output types that can be chosen for these outputs always be connected to the middle terminal The second wire must either be connected to the N C terminal if you want the path to be closed when the relay is de energized or the N O terminal if you want the path to be open during power fail Auxiliary Output ure Type Description COOL 3 Third stage of cool b p o M aa m o Dy ee K 11 e dip Switch will need to DE Set to COOL 4 Fourth stage of cool O Pome P for proper operation Refer to Table 4 5 and HEAT 3 Third stage of heat Table 4 6 on page 15 HEAT 4 Fourth stage of heat FAN 2 Additional fan or 2nd fan speed RELAY IS RELAY IS CLOSED OPEN ON HEAT PUMP REV If a heat pump is being used this re o US 9000 VALVE CLOSED versing valve output will close C O N C N O HEAT when
11. RTU in conjunction with other MultiFlex boards Refer to your site controller s manual for VA ratings of the other I O boards that may be powered by one of these transformers Center MultiFlex a 88AO 168 Murex RTO 75 2 NO Table 2 2 Device Power Requirements 2 3 2 MultiFlex RTU Power Wiring The MultiFlex RTU boards do not use a cen ter tap Instead the OV terminal on the board should be connected to a separate Earth ground Important The rules that must be fol lowed when connecting a MultiFlex RTU board to a transformer are different depend ing on whether you have a new style Multi Flex board with an isolated power supply all MultiFlex boards shipped after November 1 2002 or an old style MultiFlex board all MultiFlex boards shipped before November 1 2002 A new style MultiFlex board has a green power LED located next to the 24VAC connec tion terminal in the upper right corner of the cir cuit board see Figure 2 4 for reference 4 MultiFlex RTU Operator s Guide POWER LED New Style MultiFlex Board Top Left Corner NO POWER LED Old Style MultiFlex Board Top Left Corner Figure 2 4 New Style vs Old Style MultiFlex Board If there 1s a green power LED next to the connector your MultiFlex is a new style Multi Flex refer to Section 2 3 2 1 New Style Mul tiFlex RTU Boards with Isolated Power Supply for power wiring instructions If there is no green power
12. any number from 0 to the number of cool stages available on the RTU Time The current time in 24 hour format Date The current date in month day year format Day The current day of the week Daylight Savings Whether automatic daylight savings time set back is dis abled or following a month week schedule Spring Fall If the RTU is set up to change the times on specific days of the year enter the dates in the Spring and Fall fields Road Map from Description RTU Main Menu Control Menu t Use T To Defin SUMMER WINTER S EMP e Sea 05 01 10 01 O 6 gt t ANLG OVERRIDE A01 000 A02 t RUNTIME RES FAN H1 H2 C1 AX1 AX2 t RESET ALARMS RESET SETPTS Use to Define Season Whether the DATE or the outside temperature TEMP is being used as the summer winter switch over control value Summer Winter If the date is being used as the summer winter switch over control value the month and the day of the switch overs must be entered in the Summer Winter fields If temperature is being used as the control value enter the temperature set points in the rightmost Summer Winter fields All RTU outputs shown in this screen may be bypassed ON OFF or returned to normal by moving the cursor to the field and selecting ON OFF or NOR by pressing the dash key Analog outputs A01 and A02 may be bypassed ON OFF or returned to nor
13. board has eight analog inputs pre configured for quick connection to space temperature sensors supply and return air temperature sensors and fan and compressor proofs Its eight relay out puts rated 2 0 amps max are used for activating and deactivating fans heat and cool stages economizers and other systems or devices 1 3 Independent System Control The RTU can control a rooftop unit indepen dently without the need of a central controller such as CPC s Einstein BX Refrigeration Con troller However the RTU is designed to inter face with an Einstein BX or BCU to allow it to work with other RTUs together to control large zones Networking RTU to a central controller also allows you to view status on Einstein amp UltraSite32 status screens report alarms and control dehumidification The RTU s configuration can be pro grammed either with a CPC Hand Held Termi nal HHT or through the Einstein front panel Overview of the MultiFlex RTU 1 2 Mounting and Power Ing The MultiFlex boards are usually mounted by the refrigeration equipment manufacturer Therefore the installer need only make the nec essary connections between the boards and the site controller s In some instances an installer may be required to mount an I O board There are no restrictions on the location of these boards how ever for ease of network configuration 1t 1s rec ommended that the boards be located adjacent to the Einstei
14. cooling stages are active and open when heating stages are active This relay will be activated when any RTU alarm is generated and re turn to normal when the alarm con Figure 4 7 Form C Contact Wiring dition is acknowledged reset or cleared from Einstein or BCU Table 4 4 Auxiliary Output Types 14 MultiFlex RTU Operator s Guide 026 1706 Rev 1 10 29 02 4 2 4 Output Fail Safe Dip Switch es When a controller calls for a MultiFlex relay output to be ON it sends a command to the Mul tiFlex to turn the output to the ON state signi fied by the output LED being ON The behavior of the relay when it is ON 1s determined by the position of the fail safe switch The fail safe switches for the outputs are on a switch bank at the bottom right corner the plug in output mod ule Each switch corresponds to an output on the board switch 1 output 1 etc Table 4 5 and Table 4 6 show how the fail safe switch and Form C contacts should be con figured based on how you want the output to perform during both normal operation and dur ing network power loss Note There are not many cases where you would want a relay to be OPEN when called to be ON For most applications you will want to set the fail safe switch to UP so that an ON com mand from the controller will close the relay State of Normally Closed N C Contacts on MultiFlex Relay Points Loss of Fail safe Light Switch i Light is
15. the transformer secondary 1s connected to earth ground before powering the old style MultiFlex board A grounded secondary will damage the MultiFlex board In addition the old style MultiFlex RTU boards can be powered by one of the 50VA or 75VA non center tapped transformers listed in Table 2 1 on page 3 Figure 2 6 shows how to wire the transformers to the MultiFlex boards 2 3 3 Wire Types and Maximum Distances For powering I O boards use only the listed wire types from Table 2 3 Three conductor non shielded cables are the recommended wire for connecting between the center tapped trans former and the I O boards Shielded cable should not be used for power wiring The center tap should be wired with the third conductor to earth ground at the transformer Power Wiring Types 14 AWG Belden 9495 18 AWG Belden 9493 Table 2 3 Power Wiring Types The wire length from the transformer and the number of boards connected to the same wire determines the type wire gauge used In most cases the distance between the I O boards and the transformer that supplies power to them is not enough to be concerned with But it is very important not exceed this maximum wire length or the boards will malfunction 6 MultiFlex RTU Operator s Guide Use these formulas to determine 1f the wire gauge you are using fits within specification 14 AWG Feet 0 25 VA 24 x 0 00252 18 AWG Feet 0 25 VA 24 x 0 0064 VA is the total
16. 00000hrs 000 of time tHEAT1 0DODOhrs 000 of time HEAT2 00000hrs 4 000 Of time 00000hrs 00 of time 00000hrs of time 00000hrs 000 of time RTU 1 00F01 ONLINE BAUD NET CTR LAST MSG 7 4 Control Menu Control Menu CONTROL MENU L SETPTS S SETUP 2 SCHEDS 4 OVRRD WINTER OC UN Compl and Comp2 Number of hours cooling stages 1 and 2 have been active The percentages show the percentage of operation since the last time runt imes were cleared Heat I and Heat 2 Number of hours heating stages 1 and 2 have been active The percentages show the percentage of operation since the last time runt imes were cleared Fan Number of hours the fan has been active The percentage shows the per centage of operation since the last time runtimes were cleared Auxiliary 1 and 2 Number of hours auxiliary outputs 1 and 2 have been ac tive The percentages show the percentage of operation since the last time runtimes were cleared Screens within the Misc Status menu are used by service technicians to trou bleshoot RTUs 1 Setpts RTU set points may be changed using these screens 2 Scheds RTU schedules may be changed and schedule overrides may be ordered using these screens 3 Setup RTU setup information may be entered using these screens 4 Override Inputs and outputs may be overridden and run times may be re set using these screens Oc
17. 026 1706 Rev 1 10 29 02 MultiFlex RTU Rooftop Controller Installation and Operation Manual COMPUTER PROCESS CONTROLS Lo 8 QU COMPUTER PROCESS CONTROLS 1640 Airport Road Suite 104 Kennesaw GA 31044 Phone 770 425 2724 Fax 770 425 9319 ALL RIGHTS RESERVED The information contained in this manual has been carefully checked and is believed to be accurate However Com puter Process Controls Inc assumes no responsibility for any inaccuracies that may be contained herein In no event will Computer Process Controls Inc be liable for any direct indirect special incidental or consequential damages resulting from any defect or omission in this manual even if advised of the possibility of such damages In the interest of continued product development Computer Process Controls Inc reserves the right to make improvements to this manual and the products described herein at any time without notice or obligation READ ALL INSTRUCTIONS CAREFULLY If the equipment is not used in the manner specified by the manufacturer the protection provided by the equipment may be impaired SAVE THIS INSTRUCTION MANUAL This instruction manual contains important operating instructions for the MultiFlex RTU rooftop control board Table of Contents 1 OVERVIEW OF THE MULTIFLEX RTU iia ds 1 I DIFFERENCES BETWEEN THE MULTIELEXRTU ANDAR TG 4 E dodaci eeaewissAetas l E2 EU A a E t ataned ea cea voceundedeeate l t3 INDEPEN
18. 2 1 3 RTU Main Menu Road Map from Description RTU Main Menu RTC MAIN MENU 1 STATUS 2 CONTROL USE F1 FOR HELP Status Menu 1 Status Brings up the status menu 2 Control Brings up the control menu Road Map from Description RTU Main Menu STATUS MENU 1 INPUTS 3 RUNTM 2 OUTPTS 4 MISC JTEMP OPEN WINT SP OPEN RT OPEN SpaceTmp2 OPEN SpaceTmp2 OPEN t Outside Ctrl Temp OPEN L1 CLA cc IR FLOW FAN H1 H2 C1 C2 OCC AX1 AX2 ECO ON ae ca ac tPC 30 OS 15 y DEHUM ANALOG OUT1 000 ANALOG OUT2 000 tMake Up Air INACTIVE Timer OOO 10 Dampr Offset OOO 24 MultiFlex RTU Operator s Guide 1 Inputs The status of RTU inputs may be viewed at these screens 2 Outputs The status of RTU outputs may be viewed at these screens 3 Runtimes The runtimes of RTU fans cooling and heating stages and aux iliary outputs may be viewed at these screens 4 Misc Miscellaneous RTU information may be viewed at these screens Temp The current space temperature reading Wint Summ Whether the RTU is operating in Summer or Winter mode Sp The current supply air temperature reading Rt The current return air temperature reading The last two lines of the display show the current status of auxiliary inputs 1 and 2 Outside The current outside temperature reading Ctrl Temp The current control temperature valu
19. DENT SYSTEM CONTRO Mec ii enee E EE l 2 MOUNTING AND POWERING ira ia A NAS 2 Lo ONAP TRACE INSTALLA ON nnen E E E 2 22 TAE PEUG IN OUTPUT BOARD ou a iia 3 205 POWERING THE MUL TIP EEX RTU BOARD sra E RON 3 LIL Choosing LEAR ME ia 4 DSi MILE IT OT OWT VU ii 4 2 3 2 1 New Style MultiFlex RTU Boards with Isolated Power Supply ccccccnnononoonononocnnccononanananoncnnnnnnnonnncnonnnnnnn ono nnnnnononnnos 4 2 3 2 2 Old Style MultiFlex RTU Boards No Isolated Power Supply ccccccccnnooooooonononcnonocononananonnnnnnononnnnnnnnonnnnnn non nnnnnnnnnnnos 5 LI Wire 1ypes and Maximum DISTANCES rers A A E E 6 2 4 THE MULTIFLEX RTU BATTERY AND BATTERY ENABLE JUMPER ccccccccccceeeeseessseseeesnnnnnnneeeeeceeeeeeeeeeeeesesseeeeeeeegs 7 3 REE TOU INE EVV ORR A RN 8 lice WRNG TYPE Gis O A 8 Sd ES ACES LA E endo 8 del OLE LIIN UN DEVI AAA O a o amp 3 121 Numbers the Mali Elex RTU 23 2 oct acs teh beth et hated caus liana dita e do Ua tale 9 IMD EAS THC Band RE o cio 9 3 1 4 Setting the Terminating Resistance Jumpers oonnninncuooooooocnnononononocnnonnnnnnnnna nono no nnnnnnnnnnnnnnnnnnnnnnnnnn nn nn nnnnnnnnnnnnnnnnnnnos 9 4 RICUENPUTANDOUTPUT SETUP ninia E a 10 Ake TR 10 41 A MILE RTU Fixed Input Loca lons 2 A A A AET RE E 10 Alena AALAY UNUL TV OCS EE EEE N E C haere te earners 10 4 1 3 Wiring Sensors to the MultiFlex RTU oooccnnnnnnnnoiooooonononannnonononononononnnannnnnnnn non nn nono nnnnnnnnnnnnnanennn no
20. OCPD and UNOC fields If temperature is being used as a schedule control value the temperature set point may be entered in the TEMP field If desired the BCU s Optimum Start Stop feature may be used on any of the OCPD and UNOC times To activate OSS move the cursor to the field di rectly to the left of the OCPD or UNOC field and press the dash key An asterisk should appear in this field signifying that OSS 1s active Overrides of the occupied unoccupied status of an RTU may be configured and ordered using this screen The Timer Default field shows the default length of an occupied unoccupied override If desired an override can be ordered for a set number of minutes by entering a time in the Timer field SPC SP RT P12 AF Shows whether the space temp supply air return air compressor proof compressor 2 proof and air flow inputs are present 1 or absent 0 These values may be changed by moving the cursor to the field and pressing the dash key AUX1 AUX2 The auxiliary input types may be chosen by entering a two digit code in this field Refer to Table 4 2 on page 11 and enter the code number corresponding to the desired input type FN H1 H2 Cl C2 ECO Shows whether the fan heat stage 1 heat stage 2 cool stage 1 cool stage 2 and economizer outputs are present 1 or absent 0 These values may be changed by moving the cursor to the field and pressing the dash key AUXI AUX2 The aux
21. T is unplugged from the RTU Einstein will change all parameters changed with the HHT back to their original val ues 7 1 RTU Hand Held Terminal Status Screens When an HHT 1s plugged into an RTU users may access a series of screens that display input and output status information Certain control parameters such as offsets set points and dead bands may also be changed in these screens The HHT may also be used to initiate cooling heating fan auxiliary and economizer over rides The UP and DOWN keys on the HHT key pad are used to scroll through the screens The DOWN key scrolls forward through the screens and the UP key scrolls backward Some screens will have fields that may be changed using the HHT To change the value in a field press the RIGHT arrow key A cursor will appear in the screen next to the first change RTU Hand Held Terminal Status Screens able field in the display Use the UP and DOWN arrow keys to move the cursor to the desired field and enter the desired value using the numeric keypad or select an option using the dash key When finished use the UP and DOWN arrow keys to move the cursor off the screen At any screen the F1 key may be used to call up a brief description of the screen s function To exit the help screen press any key on the keypad The following sections show the HHT screens for all RTU types currently available The MultiFlex RTU Hand Held Interface 23 1
22. TUS LEDs SWITCHES S3 S4 INPUT TYPE DIP 14 OUTPUT FAIL SAFE SWITCHES S1 S2 SWITCHES 7 BOARD STATUS LEDs 15 ANALOG OUTPUTS 1 Code A Code B General and 2 active for RTU 3 Status and 4 inactive DC POWER OUTPUTS NETWORK STATUS LEDs 3 at 5VDC at 12VDC Table 1 1 MultiFlex RTU The MultiFlex Rooftop Unit Board RTU P N 810 3062 is a smart combination input output board designed to control package roof top HVAC units The MultiFlex RTU is capable of controlling heat and cool stages fans humidi fication and dehumidification devices econo mizers using on board I O and control algorithms as well as monitor and interact with other building control systems and peripherals such as smoke alarms and CO2 sensors Differences Between the MultiFlex RTU and ARTC 1 1 Differences Between the MultiFlex RTU and ARTC The MultiFlex RTU is a hardware replace ment for CPC s ARTC rooftop unit control boards which are now discontinued The RTU firmware is in every way identical to the ARTC and is compatible with both Einstein BX and the REFLECS BCU controllers The only difference between the RTU and ARTC is the RTU uses the MultiFlex hardware platform which is smaller and more robust 1 2 The RTU s I O Points The compact size of the RTU allows techni cians to easily field mount the RTU in a rooftop unit or enclosure close to it allowing for easy local connection of sensors and transducers The
23. VA rating of the I O boards For example if you had an 80 VA load 14 AWG 29 ft rounded down 18 AWG 11 ft Table 2 4 Power Wire Lengths Sensors requiring 24VAC can be powered from the same transformer powering the input board as long as the resulting total load of both the input board s and the sensor s connected to the transformer does not exceed the trans former s VA rating 026 1706 Rev 1 10 29 02 2 4 The MultiFlex RTU Bat tery and Battery Enable Jumper The RTU uses battery backed memory to store set points and the current time and date The battery for the MultiFlex RTU 1s located either underneath the output plug in board for old style MultiFlex boards or on the rear side of the input board layer facing the snap track Fig ure 2 7 OLD STYLE MULTIFLEX BOARD LI gt Z O ad LE NEW STYLE MULTIFLEX BOARD O BATTERY BACK VIEW Figure 2 7 MultiFlex Battery Location Battery backed memory 1s enabled by the ENABLE BATTERY jumper JP5 located at the bottom right corner of the input board layer Figure 2 8 This jumper is shipped from CPC in the DISABLE position The jumper should be The MultiFlex RTU Battery and Battery Enable Jumper set to the ENABLE position UP before instal lation To preserve battery life when storing the MultiFlex RTU the jumper should be set to the DISABLE position
24. assume that economization is OK For variable position economizers the position of the dampers will be set to 100 Humidity Failure Under normal conditions the RTU dehumid ifies when the Zone application sends a signal to dehumidify As long as the RTU receives this signal from the Zone application any failure of an on board humidity sensor will have no effect since this sensor 1s not being used as the direct control value When communications with the Zone appli cation are lost the only way an RTU may dehu midify without help from the Zone application is if a humidity sensor 1s present on the board itself If no sensor is present or if the sensor has failed dehumidification will not take place 026 1706 Rev 1 10 29 02 7 The MultiFlex RTU Hand Held Interface The MultiFlex RTU Hand Held Terminal interface allows you to view status of the rooftop HVAC systems and configure set points directly on the board If you are using RTUs separate from a central Einstein or BCU system the Hand Held Terminal will be the only program ming interface you may use IMPORTANT If the RTU boards are con nected to a parent Einstein or BCU do not use the Hand Held Terminal to make permanent configuration changes Changes made to an RTU via the Hand Held Terminal are designed to be temporary for units connected to an Ein stein or BCU The parent controller does not rec ognize any configuration changes made by the HHT and when the HH
25. cupied and unoccupied summer and winter set points may be viewed and changed at this screen Dead bands on delays and off delays for heating and cooling set points may be viewed and changed at this screen The MultiFlex RTU Hand Held Interface 25 Road Map from 0 0 RTU Main Menu ae E ALM SPTS OCC SPAC UNO SPAC ty SUPPLY tOCPD OVERRIDE Timer Default 060 MIN Timer OOO MIN INPUT SETUP SPC SP RT P12 AF 1 1 100 0 AUX1 00 AUX2 00 t OUTPUT SETUP FN H1 2 C1 2 ECO O 11 1141 0 AUX1 00 AUX2 00 t ANLG OUTPUTS TYP MIN MODE A01 00 00 00 A02 00 00 00 th ANLG OUTPUTS A01 7 A02 00 0 26 MultiFlex RTU Operator s Guide If temperature is being used as the summer winter switch over control value the summer and winter set points may be entered at this screen Seasonal lockouts for heat and cool may be enabled or disabled by choosing YES or NO in the HEAT and COOL fields Alarm setpoints for occupied and unoccupied space temperatures and supply air temperatures may be set at this screen Dehumidification and humidification set points dead bands for these set points and minimum building temperatures may be viewed and changed at this screen The standard week schedule may be set using this screen Days of the week are chosen in the field at the top left and times are entered in 24 hour format in the
26. device for the compressor on stage 3 COMP 4 PROOF If an auxiliary output is configured to be COOL STAGE 4 COMP 4 PROOF is the proof checking device for the compressor on stage 4 OUTSIDE HUMIDI An analog outdoor rela TY 4 20 mA tive humidity sensor with a 4 20 mA output An analog indoor relative humidity sensor with a 4 20 mA output An analog outdoor rela tive humidity sensor with a 0 5V output INDOOR HUMIDI TY 4 20 mA OUTSIDE HUMIDI TY 0 5V INDOOR HUMIDI TY 0 5 V An analog indoor relative humidity sensor with a 0 SV output 10 HUMIDISTAT A digital humidity switch ENTHALPY A digital enthalpy switch SWITCH used for economization checking LIGHT SENSOR A light level sensor LIGHT SWITCH A digital light level switch FREEZE STAT A digital temperature sen sor mounted near the cool stage evaporator used to detect coil freezes Table 4 2 Auxiliary Input Types 12 13 14 Code Auxiliary Input Type Description 16 DIRTY FILTER A digital device that de tects blocked filter condi tions 17 TEMP General temperature sen sor 18 OVERRIDE An override switch SWITCH 19 CO2 SENSOR Carbon dioxide sensor Table 4 2 Auxiliary Input Types 4 1 3 Wiring Sensors to the Multi Flex RTU Wiring an input to the input points on a Mul tiFlex board requires three steps 1 Connect the sensor s signal wires to the two terminals of an input point
27. device on the end must be terminated by placing all three termination jumpers in the OUT toward the left edge of the board position All other devices on the daisy chain must be set to the IN toward the center of the board position Figure 3 3 shows the proper terminating resis tance jumper settings for the Einstein and for all I O boards NO TERMINATION TERMINATION Figure 3 3 I O Network Termination Jumper Settings The I O Network 9 4 RTU Input and Output Setup 4 1 The Inputs 4 1 1 MultiFlex RTU Fixed Input Locations 1 2 J 4 C J6 47 J8 DI ne a oo er es or equivalent Fuse Only Ooh oo i MANN B 4 15 6 7 8 v DETAIL A A v SIG SIG v SIG SIG v SIG SIG SIG v SIG INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 INPUT 8 SPACE TEM SUPPLY A RETURNAI COMP 1 PROO COMP 2 PROO AUX INPUT AUX INPUT Figure 4 1 MultiFlex RTU Input Locations The MultiFlex RTU has pre defined loca tions for connection to all sensors that are typi cally present for a rooftop unit Figure 4 1 shows the locations and functions of each input and Table 4 1 describes the function of each point The default locations cannot be changed in the RTU system software although inputs Auxiliary 1 and Auxiliary 2 points 7 and 8 may be configured to accept several different types of in
28. e CLI CL2 The status of cooling stage proofs 1 and 2 Air Flow The status of the air flow switch Fan Status of the fan output H1 H2 Status of heating stages 1 and 2 C1 C2 Status of cooling stages 1 and 2 Occ Shows whether the outputs are operating in occupied or unoccupied mode AX1 AX2 Status of auxiliary outputs 1 and 2 ECO Status of the digital economizer output PC The number of minutes the RTU has determined to be necessary for an Optimum Start Duration Refer to your controller s user manual for more information on Optimum Start Stop OS The number of minutes in the RTU s Optimum Stop Duration This value will remain fixed at 15 minutes Refer to your controller s user manual for more information on Optimum Start Stop Dehum The number to the left of DEHUM shows the number of cools be ing used for dehumidification purposes The indicator to the right of DE HUM shows the current state of dehumidification ON to indicate dehum is active to indicate not active Analog Out 1 2 Output percentages of analog outputs 1 and 2 Make Up Air Whether the make up air strategy is active or inactive Timer Number of minutes left on the Make Up Air timer The number in pa renthesis is the defined Make Up Air set point Dampr Offset Percentage of damper offset during makeup mode 026 1706 Rev 1 10 29 02 Road Map from Description RTU Main Menu 4COMP1 00000hrs 000 of time COMP2
29. e dip switch tells the input board whether or not the sensor connected to the point is a resistive type sensor Generally if the sensor or transducer supplies its own voltage signal to the point the dip switch should be set to the LEFT OFF position If the sensor uses variable resistance and requires voltage to be supplied to it from the input point set the dip switch to the RIGHT ON position Dip switches for unused points should be set to the RIGHT ON position 2 Set RIGHT for sensors that require voltage from the input point e g temp sensors Set LEFT for sensors that supply their own voltage all 5V and 12V sensor devices except CPC 5v pressure xducers E gt E D Co D o o E do a Figure 4 3 Input Type Dip Switches for RTU Board 12 MultiFlex RTU Operator s Guide 4 1 4 Input Connection When Re placing ARTC with RTU If the RTU you are installing is replacing an existing ARTC you will not be able to simply unplug the input connectors from the ARTC and plug them into the RTU Doing so will cause the inputs to be reversed and the polarity to be swapped You must either re wire each input to the proper place on the RTU board or obtain a Mul tiflex input adapter cable P N 335 2301 as shown in Figure 4 4 Plug the connector with the probe wires attached into the female end of the adapter and plug the male end into the RTU input socket MALE
30. eld Terminal port When this LED is not blinking it means no HHT is plugged into the board When it is blink ing rapidly it means a HHT is present The Code A LED will also glow without blinking for 1 2 second every time a screen update occurs on the HHT Board Status LEDs 17 5 4 The Code B LED The Code B LED 1s an indicator of the state of the I O network When this LED 1s flashing once ever 4 seconds the RTU 1s communicating properly on the I O network When the LED is flashing once every two seconds the board 1s not properly communicating on the I O network 5 5 Relay Output LEDs Each relay output point on a MultiFlex has an indicator LED that shows the status of the output This LED is lit to show the output is ON and unlit to show the output is OFF The definition of ON and OFF in this case is determined by the position of the fail safe dip switch see Table 4 5 and Table 4 6 18 MultiFlex RTU Operator s Guide 026 1706 Rev 1 10 29 02 6 Software Overview 6 1 Introduction to Zone Control RTUs are designed to be grouped together in zones Zones are groups of ARTC RTUs and or AHU air handling unit applications that share the same heating cooling and dehumidification set points as well as other control parameters The primary purpose of zone control is to main tain a specific temperature and humidity level throughout a wide area using multiple rooftop units In general terms it is best to t
31. er fan speed on failure or economizer on failure All that is required to connect a device to an analog point is to connect the terminal to the positive wire on the device and the terminal to the negative or ground wire of the device 16 MultiFlex RTU Operator s Guide 026 1706 Rev 1 10 29 02 5 Board Status LEDs When a MultiFlex board 1s powered up you will be able to determine the operating status of the board by observing 1ts status LEDs Figure 5 I shows the location of the MultiFlex s status LEDs Tx and Rx LEDs Figure 5 1 MultiFlex Status LED Locations 5 1 Status LED The Status LED blinks GREEN once per second to show that the board is powered and operational If this light is dark the board has likely lost power 5 2 Tx and Rx LEDs The Tx and Rx LEDs indicate when the Mul tiFlex 1s sending or receiving messages on the RS485 network The Tx LED blinks once every time the Mul tiFlex sends a response to the Einstein or REFLECS The Rx LED blinks once when the MultiFlex receives a message Status LED AS STATUS LEDs If the MultiFlex is connected to the network and set up to communicate with the controller you should see these lights blinking regularly If they do not there may be a problem with the net work 5 3 The Code ALED The Code A LED on the MultiFlex RTU indicates activity on the Hand H
32. hink of the relationship between an RTU and its parent con troller Einstein or BCU as a master slave arrangement Each RTU does most of the work to keep its own environmental conditions within the range specified by its master The master tells each slave what conditions must be met Because zone control is already covered in the Einstein BX manual P N 026 1602 and REFLECS BCU manual P N 026 1102 this manual will only cover how the RTU itself per forms its control functions Refer to the control ler s user manual for instructions on how to set up zone control 6 2 Temperature Control In its most basic form temperature control in an RTU reads the space temperature input value compares it to the active heating or cooling set point and activates or deactivates heating or cooling stages in an effort to satisfy the set point The majority of user setup that must be done in Temperature Control involves defining differ ent set points in the RTU s parent Zone for use in occupied unoccupied summer and winter modes and setting up the operating characteris tics of the heating and cooling stages Introduction to Zone Control 6 2 1 Set Points There are two active set points in an RTU a cooling set point and a heating set point both of which are supplied by the zone from the Einstein or BCU When the input rises above the cooling set point cooling mode begins and when the input falls below the heating set
33. iliary output types may be chosen by entering a two digit code in this field Refer to Table 4 4 on page 14 and enter the code number corresponding to the desired output type TYP Shows whether the analog outputs A01 and A02 are absent 00 con trolling analog economizers 01 or controlling variable speed fans 02 To change the value enter 00 01 or 02 in this field MIN The minimum percentage the analog output will be allowed to be MODE The mode setting determines at what times the economizer damper is allowed to modulate to the minimum percentage either Always Open 00 or During Occupied 01 Enter the desired setting in this field RTU analog outputs modulate economizer dampers and fans by sending ap propriate voltages to the analog economizers By default the outputs will modulate from 0 10VDC To specify a different voltage range enter values in the MINV and MAXV fields 026 1706 Rev 1 10 29 02 Road Map from RTU Main Menu MN E th MISC SETUP FANMODE OCC AUTO FANMODE UNO AUTO DEHUM COOLS 01 t DAYLT SAVINGS DISABLED SPRING 04 02 95 y FALL 10 29 95 Fanmode OCC UNO The occupied and unoccupied fan modes Set to AU TO to have the fans be on only when stages are active ON to have the fans always on or SOWA to be AUTO during summer and always ON during winter Dehum Cools Number of cool stages available for dehumidification This field can be changed to
34. is saved in its own mem Ory Likewise the RTU will determine the cur rent season from its parent Einstein 1f associated with a zone or it will use 1ts own methods if a zone association 1s not present or not available You may choose to have the RTU use specific dates in the year for summer winter switch overs or you may switch summer winter mode based on outdoor air temperature note the RTU must have an auxiliary input set up as Outdoor Temp to use this method of summer winter switch over 6 3 Fan Control The RTU boards support control of one sin gle speed fan stage a low and a high speed fan stage 1 e two speed fan control or a variable speed fan The fans may be controlled in one of three ways e Continuous The fan is always on even when the AHU Zone application is not in heating cooling or dehumidification mode e Auto The fan is only on when the AHU Zone ap plication is in heating cooling or dehumidification mode Summer ON Winter Auto This mode allows the fan to operate in Continuous mode during the sum mer months and in Auto mode during the winter months If desired activation and deactivation delays may be set up for the AHU Zone application for both heating and cooling mode 6 4 Dehumidification and Humidification Control Unlike Temperature Control Dehumidifica tion Control and Humidification Control is han dled entirely by zones A zone typically has a single humidity se
35. l E O Ja Or J Jo Figure 3 2 RTU Baud Rate Switches Numbering RTUs On The Same Network as ARTCs Both the Einstein BX and the BCU treat ARTCs and RTUs as ARTCs for purposes of networking An RTU and an ARTC should not be assigned the same number In other words if a network has two ARTCs and two RTUs do not number the ARTCs 1 and 2 and the RTUs 1 and 2 3 1 3 Setting the Baud Rate All I O boards have dip switches that deter mine the baud rate at which they communicate Currently the baud rate dip switch in network components may be set at either 9600 or 19200 Wiring Types baud Either may be used refer to your site controller s user manual for the baud rate recom mendation currently 9600 baud for both REFLECS and Einstein controllers On all MultiFlex boards switches 6 and 7 on S3 are used to set the baud rate To communicate at 9600 baud set switch 6 UP and 7 DOWN For 19200 baud set switch 6 DOWN and 7 UP Refer to Figure 3 2 for a visual look at how the switches must be set 3 1 4 Setting the Terminating Re sistance Jumpers All MultiFlex boards and other RS485 devices have a set of terminating resistance jumpers one jumper for each wire lead These jumpers are labeled JP2 JP3 and JP4 on the MultiFlex board The purpose of the jumpers is to indicate the two ends or termination points of the segment On a daisy chain one device at the beginning and one
36. mand Shed and Curtailment Set Point Reset and Opti mum Start Stop will not be available 6 9 Sensor Failures In many cases RTUs and zone applications can compensate for sensor failures by substitut ing other sensor values This allows the RTU systems to continue operating as close to normal as possible until the failed sensors can be fixed or replaced Space Temp Failure If a space temperature sensor on an RTU fails the zone will use its zone temperature value as a replacement value A failure alarm will be generated and sent to the Alarm Advi sory Log Outside Air Temp Failure Failure of the outside air temperature sensor affects Economization only if Temperature Comparison is the chosen method of econo mization enabling In this case economization will be disabled for both normal and stand alone operation A failure alarm will be generated and sent to the Alarm Advisory Log 22 MultiFlex RTU Operator s Guide Supply Air Temperature Failure If the RTU has an input set up as a supply temperature sensor differential alarming will be disabled when this sensor fails A failure alarm will be generated and sent to the Alarm Advi sory Log Mixed Air Temperature Failure If the RTU has an input set up as a mixed air temperature sensor economization defaults to ON or OK when this sensor fails In other words if Economization has no mixed air temperature sensor to help verify that economization is OK it will
37. n I O boards may be mounted with out an enclosure but they should be mounted in a location that is not easily accessible to avoid tampering or damage 2 MultiFlex RTU Operator s Guide 2 1 MultiFlex boards not supplied in a custom panel or other enclosure are supplied with a snap track for easy installation The insulation sheet and I O board must be removed from the track before the track is mounted The snap track is mounted using the 0 1875 mounting slots Figure 2 1 shows this installation procedure Snap Track Installation 1 REMOVE THE BOARD AND THE INSULATOR FROM THE SNAP TRACK 2 MOUNT THE SNAP TRACK USING THE 1875 SLOTS PROVIDED Emm OPERATION OF THE BOARD WITHOUT THIS INSULATOR VOIDS WARRANTY AND MAY CAUSE SERIOUS DAMAGE TO THE BOARD THISINSULATOR MUST TEMPORARILY REMOVE BEINSERTED BETWEEN THIS INSULATOR WHILE THESNAP TRACK AND MOUNTING SNAP TRACK THECIRCUTBOARD TO PANEL 3 REINSTALL THE INSULATOR IN THE SNAP TRACK 4 REINSTALL THE BOARD IN THE SLOTS IN THE SNAP TRACK 26501040 Figure 2 1 MultiFlex Snap Track Mounting Figure 2 2 provides mounting dimensions for the MultiFlex board O 10 00 4 75 TYP2PLO A 0 218 TYP 6 PL 16A1 8RO 8DO AND MULTIFLEX BOARDS TOP VIEW Siege e E A 26501055 Figure 2 2 MultiFlex Board Dime
38. ng the MultiFlex RTU Board You may also tie one side of the secondary but not BOTH sides to an earth ground pro vided none of the boards powered by the same transformer are old style MultiFlex boards see Section 2 3 2 2 YELLOW O 110 220 VAC a CLASS 2 POWER YELLOWS VAC P N 640 0041 110VAC Primary 50VA P N 640 0050 110VAC Primary 75VA P N 640 0042 220VAC Primary 50VA P N 640 0045 220VAC Primary 75VA Figure 2 6 Non Center Tapped Transformer Wiring 2 3 2 2 Old Style MultiFlex RTU Boards No Isolated Power Sup ply Like the new style MultiFlex board the old style MultiFlex board can be connected to any of the center tapped transformers mentioned in Table 2 2 provided you follow the following three rules Rule 1 Ground the 0V terminal on the old style MultiFlex board to an Earth ground Do not connect the center tap of the trans former to the 0V terminal Rule 2 Do not power an old style MultiFlex non center tapped board with a transformer that is also powering a center tapped device This means you cannot connect an old style MultiFlex non center tapped board to a trans former that is powering a MultiFlex 16 16AI SRO 4A0 8DO or any previous generation CPC board that uses center tapped power Doing so will destroy the MultiFlex board Rule 3 The secondary of the center tapped transformer must not be grounded on any side Mounting and Powering 5 Verify that neither side of
39. no nnnnnnnnnnnnnnnanns 11 A e emia AL ta lets 11 ATA Sensor WIE TYPES A cease E E ueedertanesessneccuenders 11 A pat Type DID A A E adult cet auteurs eet eate bes 12 4 1 4 Input Connection When Replacing ARTC With RTU oooooooooccnncnncnncnnnnnnnonnnonononnnonnnnnnnnnnnnnnnnnnnnnnn EEE G EEE EE EEEEEE EEE EEE 12 Add ONO GT OWEF CONT COMO A EZ Alo Current Rat os tor On Board POWer QUIE 13 4 1 5 2 Powering Sensors Requiring 24VAC Off the Power TransforMeT ccconcnnnonoooonononnnnnccnnnnnnnnnnnnonononnnnnnnnnnnnnnnnoninannnnnononnnnnos 13 A A A O A 13 Ad AMES RAE TCC O COM LIS EE N ean aiccu ea eaten 13 ADD MultiF lex RTU Auxiliary Output TES ds 14 Pd MATTE QUIDUES TOO ES AA AR htrarr a 14 42 4 Output Fail Safe DIOS MES bicis is 15 4AN Relay Output kauno s and Tuse TOteCHON ora n E ica 15 A ANALOG UM PUTS rarnana a a a 16 Aade WONO TER TE ANAO OUPO E OS 2 E AA 16 3 BOARD STATUS LEDS A ea ee nas 17 O acta aula AO 17 A A AND RA LEDS A a a a a a a as acusinaaeeduaataeianties 17 Ioe PEE CODE A BEED ern a T A E 17 Table of Contents MultiFlex RTU Operator s Guide v A ID A A E A E T EE AEAEE E E SR re nee 18 Sge RELAT OUTPUT EDS dis 18 6 SOFFWARE OVERVIEW ai ai aaa aaa 19 Orla INTRODUCTION TO ZONE EN eN cENUES 19 O TEMPERATURE CONTROL it 19 AS O A Secs Gh AN hae bea AA agen eh sasha tetas ache ll oh a set Tala 19 Oa Lol Set Pon Dead BAS AS A A A A A ai il io Tesla 19 02125 Stace ON ands ORE Dt a a 19 6 2 1 3 Summer Win
40. nsions 026 1706 Rev 1 10 29 02 The additional board makes the MultiFlex 2 2 The Plug l n Output RTU boards considerably taller than the Multi Board Flex 16 and other CPC I O boards If you will be mounting these boards in an enclosure the board will need at least 2 5 of clearance between the base board and the panel door 2 3 Powering the MultiFlex RTU Board All models of MultiFlex require a 24VAC Class 2 input power source The MultiFlex RTU requires the power source to be non center tapped CPC supplies a wide variety of 24VAC transformers with varying sizes and either with or without center taps Table 2 1 shows the transformer sizes and whether they are center tapped or non center tapped Figure 2 3 Exploded View MultiFlex RTU The MultiFlex RTU has an output sub board that plugs to the top of the base board Typically these boards are shipped with the output board pre installed on the board using stand offs so no additional hardware setup should be necessary VA Rating Primary Voltage Center Tap 50 VA 110 VAC 50 VA 220 VAC Table 2 1 Transformers Compatible with MultiFlex The Plug In Output Board Mounting and Powering 3 2 3 1 Choosing Transformer Sizes In most site installations a single trans former will power multiple devices Choose a transformer with a VA rating large enough to power all devices that will be attached to it Table 2 2 gives the VA ratings of the MultiFlex
41. nsor humidistat or dewpoint probe input connected to the central building 20 MultiFlex RTU Operator s Guide controller that measures relative humidity or dewpoint for the entire zone If the zone deter mines that dehumidification or humidification 1s necessary it notifies all RTUs in the zone to begin dehumidification 6 4 1 Dehumidification Control RTUs dehumidify by using cool stages or auxiliary outputs that are configured on the RTU as dehumidification devices When the com mand to begin dehumidification is received the RTUs begin by cycling on the dehumidification output if available and then a cool stage After a programmed delay 1f dehumidification is still necessary a new stage of cool will cycle ON The RTUs will continue cycling cool stages ON in this manner until 100 of its dehumidifying capacity 1s active or until the set point is met Once the set point 1s met the dehumidifier will switch OFF and stages will cycle OFF You may choose the number of cool stages that will be made available for dehumidification 6 4 2 Humidification Control RTUs humidify by activating and deactivat ing a humidifier output Humidification like dehumidification is controlled by the RTU s zone If a zone is not available the RTU may control humidity in stand alone mode if a humidity input is available on one of its auxil lary inputs When operating in stand alone mode the RTU uses cut on and cut off set poin
42. point heating mode begins RTUs activate stages in sequence starting with stage 1 and continuing on to the last stage until the space temperature meets the set point When the set point is satisfied stages are deacti vated in reverse order beginning with the high est numbered active stage and ending with stage l 6 2 1 1 Set Point Dead Bands Both the currently active heating set point and cooling set point have dead bands A dead band is a range of values around the set point where the space temperature is considered to be OK If the temperature is within this dead band the RTU will not activate new stages or deactivate any stages that are currently ON 6 2 1 2 Stage ON and OFF Delays Heating and cooling stages may be also be set up with on and off delays as well as mini mum ON and OFF times 6 2 1 3 Summer Winter and Occupied Unoccupied Set Points The RTU may be programmed with different set points that are used during occupied and unoccupied building times and summer and winter seasons The RTU has two ways of determining whether to use occupied or unoccupied set points If the RTU is associated with a zone in an Einstein or BCU it will use whatever occupied state the zone says to operate in 1 e the zone controls the schedule If the RTU is not con Software Overview 19 nected to a zone or if the RTU loses communi cations with its parent controller the RTU uses a fallback schedule that
43. puts RTU Input Point Number Sensor to Connect To This Point INPUT 1 SPACE Indoor air temperature TEMP sensor in the floor area Table 4 1 RTU Default Inputs 10 MultiFlex RTU Operator s Guide RTU Input Point Number 2 SUPPLY Temperature probe AIR mounted in the supply air flow 3 RETURN Temperature probe mounted in the return air flow Sensor to Connect Label To This Point Proof checker for com pressor on cool stage 1 Proof checker for com pressor on cool stage Sail switch to verify fan is running Configurable in RTU software see Section 4 1 2 Auxiliary Input Types Configurable in RTU software see Section 4 1 2 Auxiliary Input Table 4 1 RTU Default Inputs 4 1 2 Auxiliary Input Types Input points 7 and 8 on the RTU board are configurable in the RTU software Table 4 2 lists all of the possible input types that can be chosen for these inputs 026 1706 Rev 1 10 29 02 Code Auxiliary Input Type Description l MIXED AIR Temperature sensor mea suring the temperature of air from the economizer mixed with the return air 2 OUTSIDE AIR Outdoor air temperature sensor 3 SPACE 2 A second space tempera ture sensor This sensor s value will be combined in some way with the value of the SPACE TEMP in put to determine the con trol temperature COMP 3 PROOF If an auxiliary output is configured to be COOL STAGE 3 COMP 3 PROOF is the proof checking
44. rom the 24VAC input you must use a separate transformer The Outputs 4 2 The Outputs 4 2 1 MultiFlex RTU Fixed Outputs Figure 4 6 MultiFlex RTU Output Locations The MultiFlex RTU has pre defined loca tions for connection to all outputs that are typi cally present for a rooftop unit Figure 4 6 shows the location of the RTU outputs and Table 4 3 describes the location of each point The default locations cannot be changed in the RTU system software although outputs Auxil lary 1 and Auxiliary 2 points 6 and 7 may be configured to control several different types of outputs RTU Output Point Number HEAT 1 Heat stage 1 Device to Connect To This Point CAM HEAT 2 Heat stage 2 COOL 1 Compressor for Cool stage 1 Compressor for Cool stage 2 Table 4 3 RTU Default Outputs RTU Input and Output Setup 13 Auxiliary Output RTU Output To This Point Number HUMIDITY An output controlling a humidifier HEAT PUMP REV Ifa heat pump is being used this re Configurable in RTU VALVE CLOSED versing valve output will close software seeSection COOL when heating stages are active and 4 2 2 MultiFlex RTU open when cooling stages are ac Auxiliary Output tive Types FAIL SAFE Output relay will be ON when the RTU is on line with the Einstein or Configurable in RTU BCU and OFF when the RTU is software see Section off line 4 2 2 MultiFlex RTU ECON SHADOW Operates the same as the ECON Auxiliary
45. ter and Occupied Unoccupied Set Points ooooooooocnncnncccccnononononononnnnnnnononnnononnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnns 19 ae O Dama cen verona Amen ae CUE en ATT OUTS E NEE OT RE ee EG RTE Ren ORE Mere een ee aman TRE RETON Te OP IC E E 20 6 4 DEHUMIDIFICATION AND HUMIDIFICATION CONTROL cccccscccesscceseccessccessccessceuececeecssceceseuceeuecsececsecesseuessesesseeseees 20 A SS O ots 20 A E I AAA E laces ln E AA eat dOGh wa A E ee 20 A O mA ee eT NE SAO Tee RUE ANTE OMIDET EOE ve ARTE IE Om EERE REMI NE Rone hoe haan mer TER ONE Ann erIOn Ream RTT Te 20 Dota HAUR E CON ONIONS ei cid 21 0 CURTIS e dee nio ds 21 Oe AREVERSING VALE GON e o o at la 21 Oos ANDA ONE OPE RAT N E E ae E e ben 21 E NS O meas 22 7 THE MULTIFLEX RTU HAND HELD INTERFACE seseesseesssoesssoosssessssossseooosossssossssoosseooseoossoosssosssseossesosssoso 23 Paleo RAE AAN DE LD TERMINALES TA TUS SCREEN ccc toe icc thant ee hc cette ciel nies cit saat cant Uh tame ee ee 23 Ts Ae AS VAI SS IN cn A ecnathe tench ata tmceeacaeh Mateeaa sane 24 ES SA O SO EA Pet ETE ARE BT ee PoE 24 Di EO TRIN aa ae A eanicd ert aaceo aaa 25 vi MultiFlex RTU Operator s Guide 026 1706 Rev 1 10 29 02 1 Overview of the Multi Flex RTU 2 RS485 I O NETWORK 10 HAND HELD TERMI NAL JACK 3 RTU INPUTS 1 8 11 RELAY OUTPUT CON NECTORS 4 RTU INPUTS 9 16 NOT 12 RELAY OUTPUT FUSES ACTIVE FOR RTU 2A rated 250V slow blow 5 NETWORK ID DIP 13 RELAY STA
46. the Normally Closed N C contacts and cool reversing valves must be wired to the Normally Open N O contacts This causes the heat valves to activate when heat stages are ON and cool stages to activate when cool stages are ON 6 8 Stand Alone Operation If for some reason an RTU board loses com munications with its parent Einstein unit for longer than five minutes the board will go into Stand Alone Mode In Stand Alone Mode the RTU will con tinue Temperature Control as normal using the space temperature as a control input Since an RTU has its own stored fallback set points and a fallback occupancy schedule will continue oper ating using its occupied or unoccupied heating and cooling set points Software Overview 21 Dehumidification and Economization will occur during stand alone mode only 1f the board 1s equipped with the right sensors as described below Dehumidification Stand Alone Operation If the RTU board has an auxiliary input defined as a relative humidity sensor Dehumidi fication will continue as normal using the RH sensor as a control input Economization Stand Alone Operation The RTU can economize in stand alone mode as long as an enthalpy switch is present somewhere on the RTU board Other Stand Alone Operation The RTU will continue operating the revers ing valves if present as normal Other control features that rely on communication with Zones or other Einstein applications such as De
47. ts to control the humidifier 6 5 Economization Economizer dampers on rooftop HVAC units are used to bring outside air into the build ing for use in cooling Before economization may occur the zone must determine when the outside air conditions are favorable for economization If economiza tion 1s OK 1t sends an ENABLE signal to 1ts 026 1706 Rev 1 10 29 02 AHU Zone applications For as long as the ENABLE signal lasts AHU Zone applications treat the economization dampers as 1f they are preliminary cool stages if cooling is needed the dampers will open and economization will begin If more cooling is needed the cooling stages would then cycle on as normal 6 5 1 Analog Economizers Certain HVAC rooftop units have variable position economizers which are controlled by analog output points When economization is enabled the RTU varies the position of the ana log economizers to maintain a constant mixed air temperature 6 6 Curtailment Some power companies offer curtailment programs that allow participating stores to dis able user defined loads during peak power times in return for discounts on utility rates If you are participating in a curtailment pro gram the power company will supply you with a digital curtailment device that closes to signal the beginning of curtailment This input must be connected to the CURTAILMENT IN input in Einstein Global Data or to an Input Sensor Module set up as a Curtail
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