Nature Air RGRM-04*MAES Installation Instructions Manual
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Contents
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42setting of .15 amps is recommended.Adjust as needed to improve comfortlevel.ISOLATION RELAYIMPORTANT: NOT ALL ELECTRONICNIGHT SETBACK THERMOSTATSARE COMPATIBLE WITH THEFURNACE CONTROL SYSTEM.SOME MAY REQUIRE AN ISOLATIONRELAY.If an isolation relay is needed, install itas close to the control board aspossible. Use a single-pole, single-throw relay with a 24 volt operating coil.The relay contacts should be designedfor 24 volt loads.Connect one end of the operating coilto the thermostat “W” terminal.Connect the other end of the coil to the“C” terminal on the control board.Connect a jumper from the coilterminal connected to the thermostat toone of the normally open relaycontacts.Connect the other side of the normallyopen relay contacts to the control board“W” terminal if using a two stagethermostat. Connect that one side of thenormally open relay contacts to thecontrol board “W” terminal if using asingle stage thermostat. See Figure 41for wiring details.When the thermostat calls for heat, itpowers the 24 volt operating coil. Thiscloses the relay contacts andconducts power from terminal 3 and 4to terminal “W” on the control boardand starts the furnace ignitionsequence. See Figure 42.NOTE: Use of an isolation relaywith the two stage furnace is notnormally needed.ELECTRONIC AIR CLEANERElectronic air cleaner line voltagepower can be supplied from the screwterminal “EAC” and a line voltageneutral screw terminal on the controlboard. This will power the electronicair cleaner whenever the circulatingair blower is in operation.HUMIDIFIERLine voltage power can be suppliedfrom screw terminal “HUM” to a linevoltage neutral screw terminal on thecontrol board. This will power thehumidifier during a normal heatsequence after the blower has turnedon.NOTE: Maximum current of 1.0 Ampfor each option.FIELD-INSTALLED OPTIONAL ACCESSORIESTHERMOSTATNOTE: Do not use 24 volt control wiringsmaller than No. 18 AWG. (Refer toTable 6.)See Figure 41 for thermostat wiringoptions.A single- or two-stage thermostat may beused, however, a two-stage thermostat isrecommended for optimum performance.The room thermostat must be compatiblewith the integrated furnace control on thefurnace. Generally, all thermostats thatare not of the “current robbing” type arecompatible with the integrated furnacecontrol being used.Install the room thermostat in accordancewith the instruction sheet in the box withthe thermostat. Run the thermostat leadwires inside the control compartment.Connect the thermostat as shown on thewiring diagram. Never install thethermostat on an outside wall or where itwill be influenced by drafts, concealedhot or cold water pipes, lighting fixtures,radiation from fireplace, rays of sun,lamps, television, radios or air streamsfrom registers. Refer to the instructionspacked with the thermostat for bestanticipator adjustment or selection.Locate the thermostat approximately fivefeet up from the floor.HEAT ANTICIPATOR SETTINGSIf a current reading taken at thethermostat is not performed, an initialFIGURE 41THERMOSTAT WIRING OPTIONS2 HEAT - 1 COOL2 HEAT - 2 COOLRGPR’S AND RGLR’SONLY1 HEAT, 1 COOL(OPTION A) TIMED STAGING W/1STAGE HEAT T-STAT (AFTER F3507DATE CODE (AUGUST 2007))1 HEAT, 1 COOL(OPTION B) 100% HEAT ALWAYS -- NOTIMED STAGING |
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