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MultiFlex RTU Rooftop Controller
Installation and Operation Manual

026-1706 Rev 3

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Summary of Contents for MultiFlex RTU

Page 1: ...MultiFlex RTU Rooftop Controller Installation and Operation Manual 026 1706 Rev 3 ...

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Page 3: ...ndirect 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 Emerson 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 u...

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Page 5: ...ltiFlex RTU 9 3 1 3 Setting the Baud Rate 9 3 1 4 Setting the Terminating Resistance Jumpers 9 4 RTU INPUT AND OUTPUT SETUP 10 4 1 THE INPUTS 10 4 1 1 MultiFlex RTU Fixed Input Locations 10 4 1 2 Auxiliary Input Types 10 4 1 3 Wiring Sensors to the MultiFlex RTU 11 4 1 3 1 Wiring 11 4 1 3 2 Sensor Wiring Types 11 4 1 3 3 Input Type Dip Switches 12 4 1 4 Input Connection When Replacing ARTC with RT...

Page 6: ...r Winter and Occupied Unoccupied Setpoints 19 6 3 FAN CONTROL 20 6 4 DEHUMIDIFICATION AND HUMIDIFICATION CONTROL 20 6 4 1 Dehumidification Control 20 6 4 2 Humidification Control 20 6 5 ECONOMIZATION 20 6 5 1 Analog Economizers 21 6 6 CURTAILMENT 21 6 7 REVERSING VALVE CONTROL 21 6 8 STAND ALONE OPERATION 21 6 9 SENSOR FAILURES 22 7 THE MULTIFLEX RTU HAND HELD INTERFACE 23 7 1 RTU HAND HELD TERMIN...

Page 7: ...nfigured for quick connection to space temperature sensors supply and return air temperature sensors and fan and compressor proofs Its eight relay outputs 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 independently without the need of a central controll...

Page 8: ... be located adjacent to the Einstein I O boards may be mounted without an enclosure but they should be mounted in a location that is not easily accessible to avoid tampering or damage 2 1 Snap Track Installation 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 be...

Page 9: ... 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 Emerson 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 c...

Page 10: ... November 1 2002 A new style MultiFlex board has a green power LED located next to the 24VAC connection terminal in the upper right corner of the circuit board see Figure 2 4 for reference If there is a green power LED next to the connector your MultiFlex is a new style MultiFlex refer to Section 2 3 2 1 New Style MultiFlex RTU Boards with Isolated Power Supply for power wiring instructions If the...

Page 11: ...ered by the same transformer are old style MultiFlex board see Section 2 3 2 2 2 3 2 2 Old Style MultiFlex RTU Boards No Isolated Power Supply 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...

Page 12: ... be wired with the third conductor to earth ground at the transformer 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 boar...

Page 13: ... on the rear side of the input board layer facing the snap track Figure 2 7 Battery backed memory is 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 Emerson in the DISABLE position The jumper should be set to the ENABLE position UP before installation To preserve battery life when storing the MultiFlex RTU ...

Page 14: ... Input Output I O network connects all input and output communication boards together in a single open communications loop This loop or daisy chain connects the Einstein or REFLECS to multiple input and output communication boards and terminates at the last input or output board on the network A diagram of this network arrangement is shown in Figure 3 1 3 1 2 Network ID Numbers Each device on an R...

Page 15: ...Flex 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 Resistance Jumpers All MultiFlex boards and other RS485 devices have a set of terminating resistance jumpers one jumper for each wire lead...

Page 16: ... in the RTU software Table 4 2 lists all of the possible input types that can be chosen for these inputs Figure 4 1 MultiFlex RTU Input Locations RTU Input Point Number Label Sensor to Connect To This Point INPUT 1 SPACE TEMP Indoor air temperature sensor in the floor area Table 4 1 RTU Default Inputs 2 SUPPLY AIR Temperature probe mounted in the supply air flow 3 RETURN AIR Temperature probe moun...

Page 17: ...ontrol temperature 4 COMP 3 PROOF If an auxiliary output is configured to be COOL STAGE 3 COMP 3 PROOF is the proof checking device for the compressor on stage 3 5 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 6 OUTSIDE HUMIDITY 4 20 mA An analog outdoor relative humidity sensor with a 4 20 mA output 7 I...

Page 18: ...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 4 1 4 Input Connection When Replacing 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 b...

Page 19: ...solated from its DC output signal such as Emerson s Dewpoint Probe If the output signal is not isolated from the 24VAC input you must use a separate transformer 4 2 The Outputs 4 2 1 MultiFlex RTU Fixed Outputs The MultiFlex RTU has pre defined locations for connection to all outputs that are typically present for a rooftop unit Figure 4 6 shows the location of the RTU outputs and Table 4 3 descri...

Page 20: ...ut Type Description COOL 3 Third stage of cool COOL 4 Fourth stage of cool HEAT 3 Third stage of heat HEAT 4 Fourth stage of heat FAN 2 Additional fan or 2nd fan speed HEAT PUMP REV VALVE CLOSED HEAT If a heat pump is being used this reversing valve output will close when cooling stages are active and open when heating stages are active ALARM This relay will be activated when any RTU alarm is gene...

Page 21: ...hen called to be ON For most applications you will want to set the fail safe switch to UP so that an ON command from the controller will close the relay 4 2 5 RelayOutputRatingsandFuse Protection Each relay output on the MultiFlex Combination I O boards is rated for up to 240 VAC with a maximum current of 2A Each relay is fused with a 2A fast blow 5mm x 20mm fuse Bussman GMA 2 or equivalent State ...

Page 22: ...e in economization or fan control they must be assigned in the RTU Figure 4 8 shows the location of the analog outputs 4 3 1 Wiring the RTU Analog Output Points The analog outputs have no hardware based fail safe settings fail safes are set in the board firmware by setting either fan speed on failure or economizer on failure All that is required to connect a device to an analog point is to connect...

Page 23: ... The Tx LED blinks once every time the MultiFlex sends a response to the Einstein or REFLECS The Rx LED blinks once when the MultiFlex receives a message 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 network 5 3 The Code A LED The Code A LED on the MultiFlex RT...

Page 24: ...rk When the LED is flashing once every two seconds the board is 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 sw...

Page 25: ... the operating characteristics of the heating and cooling stages 6 2 1 Setpoints There are two active setpoints in an RTU a cooling setpoint and a heating setpoint both of which are supplied by the zone from the Einstein or BCU When the input rises above the cooling setpoint cooling mode begins and when the input falls below the heating setpoint heating mode begins RTUs activate stages in sequence...

Page 26: ...d to the central building controller that measures relative humidity or dewpoint for the entire zone If the zone determines that dehumidification or humidification is 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 command...

Page 27: ...r 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 6 7 Reversing Valve Control The RTU supports the control of a heat reversing valve and a cool reversing valve These valves may be wired to any auxiliary output on an RTU The output is control...

Page 28: ...r Temp Failure Failure of the outside air temperature sensor affects Economization only if Temperature Comparison is the chosen method of economization 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 Supply Air Temperature Failure If the RTU has an input set up as a supply temperatur...

Page 29: ...T is plugged into an RTU users may access a series of screens that display input and output status information Certain control parameters such as offsets setpoints and deadbands may also be changed in these screens The HHT may also be used to initiate cooling heating fan auxiliary and economizer overrides The UP and DOWN keys on the HHT keypad are used to scroll through the screens The DOWN key sc...

Page 30: ...e 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 Refe...

Page 31: ... Number of hours auxiliary outputs 1 and 2 have been active 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 troubleshoot RTUs Road Map from RTU Main Menu Menu Description 1 Setpts RTU setpoints may be changed using these screens 2 Scheds RTU schedules may be changed and schedule overri...

Page 32: ...verride 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 1 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 dig...

Page 33: ...erature is being used as the control value enter the temperature setpoints 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 normal by moving the cursor to the field and selectin...

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Page 36: ...warranties or guarantees express or implied regarding the products or ser vices described herein or their use or applicability Emerson reservesthe right to modify the designsor specifications of such products at any time without notice Responsibility for proper selec tion use and maintenance of any product remains solely with the purchaser and end user 2022 Emerson is a trademark of Emerson Electr...

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