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HeatRite VM-80 Installation, Operation & Service Manual
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Contents
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SECTION 10: WIRING49 of 71For 4-20mA control of the heater(s) firing rate, thefollowing control conditions apply:ON/OFF relay at the external controller or BMS mustbe wired to R and W terminals on the heater controlboard to turn the heater ON and OFF.(Open Circuit = OFF, Closed Circuit = ON).Minimum rated input at 1% of signal (0-4 mA).Full rated input at 90% of signal (18 mA).Input varies linearly between 4 mA and 18 mA.BMS controllers often offer PID loop control that canoptimize output signal and rate of change of theoutput signal. Common analog application is definedas follows:1. BMS sensors that monitor zone airtemperatures are located in the heating space.2. Based on sensed temperatures, the BMS willoutput an analog signal for the desired heater(s)firing rate.3. As heater(s) receive the analog signal from theBMS, the heater(s) modulate to the correspond-ing firing rate.4. As sensed air temperature rises closer to thedesired temperature setpoint, the BMS willreduce the output signal, in turn reducing heaterfiring rate.5. Upon satisfying temperature setpoint, the BMSwill either:a. Turn off the heater.b. Reduce the signal so that the minimumheater firing rate is maintained until thesensed temperature rises above thesetpoint to a cut-off limit temperature whenthe BMS turns off the heater.FIGURE 26: Analog Control Signal Wiring Diagram*OPTIONALSWITCHSATELLITE HEATER CONTROLFOR SATELITTECONTROLLERS, J9 JUMPER CAN BELEFT IN ORIGINAL POSITIONREGARDLESS OF CONTROL METHOD.J10 JUMPER POSITIONSHOWS "SATELLITE" DESIGNATION.MODULATION CONTROL WIRINGTO ADDITIONAL SATELLITEHEATER CONTROL TERMINALST28 and T29.ON/OFF SWITCHREQUIREDMODULATION CONTROL WIRINGTO SATELLITE HEATERSCENTRAL HEATER CONTROLREMOTE ANALOGCONTROLSIGNAL FROM SEPARATECONTROLLER0-10Vdc OR 4-20mAANALOG INPUT CONTROL ISUSED TO SELECT ANALOGSIGNAL TYPE 0-10Vdc OR 4-20mA(4-20mA POSITION SHOWN).J10 JUMPER POSITIONSHOWS "CENTRAL"DESIGNATION AND"ANALOG" CONTROL METHOD.J10J9WR-+ -+-+ OUTRATEFIRINGINRATEFIRINGEXT. POTGNDWIPERHIGHGNDBARSLIDEGNDTHERMISTORINPUTANALOGTHERMOSTATT31T29T19T18T16T14T27T25T30T28T17T15T13T26T24-+J10J9WR-+ -+-+ OUTRATEFIRINGINRATEFIRINGEXT. POTGNDWIPERHIGHGNDBARSLIDEGNDTHERMISTORINPUTANALOGTHERMOSTATT31T29T19T18T16T14T27T25T30T28T17T15T13T26T24A B A B* Separate on/off switch is optional for "satellite" heaters (install at user level). On/Off switch is used todisable heater operation or reset a heater that is in "lockout" mode. If on/off switch is not desired, leavejumper wire between R and W terminals in place. |
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