10-19-00 Air Conditioner Heat Pump Service Manual - Bryant RV ...

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Section C - Components, cont’d.To check ACTIVE terminals, place one lead from ohm meterto R terminal and the other lead to the ACTIVE terminal.SWITCH IF ROOM TEMP.COMB. IS ABOVE/BELOW TERMINALS THATFAN SETPOINT TEMP. ARE “ON”SWITCH G YAUTO ABOVE X XBELOWON ABOVE X XBELOWXThe heating and cooling thermostat has two switches onthe base. They are HEAT-OFF-COOL on the left side, andFAN-AUTO-ON on the right. This thermostat will operatean air conditioner and a furnace.FIG. C46between RC to Y and RC to G. With FAN switch to ONposition, continuity should exist between RC to G regardlessof room temperature.With HEAT-OFF-COOL switch in the OFF position and FANswitch in the AUTO position, no continuity should exist betweenRC to Y and RC to G regardless of room temperature.With FAN switch to ON position, continuity should existbetween RC to G and no continuity between RC to Y regardlessof room temperature.With HEAT-OFF-COOL switch to HEAT and FAN switch toAUTO position, no continuity should exist between RC to Yand RC to G regardless of room temperature. With FANswitch to ON position, continuity should exist between RCto G and no continuity between RC to Y regardless of roomtemperature. With room temperature below setpoint temperature,continuity should exist between RH to W. Withroom temperature above setpoint temperature no continuityshould exist between RH to W.FIG. C47Verify that the wiring to the thermostat is correct.A three-connector cable 18 to 22 AWG is to be used forlow voltage connections. Low voltage wires in the controlcompartment are marked “R”, “G” and “Y”. Route low voltagecable from thermostat to unit electrical box. Use .50dia. snap-bushing for routing cable into electrical box. SeSection C19.Connect RC from thermostat to red wire in control compartment.Connect G or F from thermostat to blue wire incontrol box. Connect Y from thermostat to yellow wire incontrol box. Use wire nuts to ensure good connections.When connecting a gas furnace to this thermostat, the RHand W terminals are used.To check the thermostat remove all wires. Next, using anohm meter, put the HEAT-OFF-COOL switch in the COOLposition. With room temperature above the setpoint temperatureand FAN switch in AUTO position, continuity shouldexist between RC to Y and RC to G. With room temperaturebelow set point temperatures, no continuity should existTo check ACTIVE terminals, place one lead from ohm meterto RC (cooling) or RH (heating) terminal and the other leadto the ACTIVE (ON) terminal.SWITCHCOMBINATIONSYSTEM FANSWITCH SWITCHCOOLHEAT OFFAUTOONAUTOONAUTOONIF ROOM TEMP.IS ABOVE/BELOWSETPOINT TEMP.ABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWTERMINALS THATARE “ON”G Y WX XXXXXXXXXX46
Section C - Components, cont’d.Models 39025.502, 39035.601, 39045.601 & 39045.616The thermostat is a 24V AC controlled system and is abimetal type. It has two switches on the face of the thermostat.On the left side there is a SYSTEM switch and on theright side there is a FAN switch. This thermostat will operatean air conditioner and a furnace.FIG. C48With the SYSTEM switch in OFF position and the FANswitch in AUTO position, no continuity should exist R to Y,R to G and R to W. With the FAN switch to ON position,continuity should exist between R to G and no continuitybetween R to Y and R to W regardless of room temperature.With the SYSTEM switch in HEAT position, FAN switch inAUTO and room temperature above setpoint temperature,no continuity should exist between R to Y, R to G and R toW. With room temperature below setpoint temperature,continuity should exist between R to W and no continuitybetween R to Y and R to G. With the FAN switch to ON,continuity should exist between R to G regardless of roomtemperature.To check ACTIVE terminals, place one lead from the ohmmeter to the R terminal and the other lead from the meterto the ACTIVE (ON) terminal.SWITCHCOMBINATIONSYSTEM FANSWITCH SWITCHIF ROOM TEMP.IS ABOVE/BELOWSETPOINT TEMP.TERMINALS THATARE “ON”Verify the thermostat wiring is correct.A three-conductor cable 18 to 22 AWG is to be used forlow voltage connections. Route low voltage cable from thermostatto unit electrical box. Use .50 dia. snap-bushing forrouting cable into electrical box. See Section C19.Connect R from thermostat to red wire in control compartment.Connect G or F from thermostat to blue wire in controlbox. Connect Y from thermostat to yellow wire in controlbox. Use wire nuts to ensure good connections.When connecting a gas furnace to Dometic’s Heat/Coolthermostat, the W and R terminals are used. This meansthere will be two wires on the R terminal (one wire from thefurnace and one wire from the air conditioner).To check the thermostat, remove all wires. Next, using anohm meter with the SYSTEM switch in COOL position andthe FAN switch in AUTO position and the room temperatureabove the setpoint temperature, continuity should existbetween R to Y and R to G. No continuity should existbetween R to W. With room temperature below setpointtemperature, no continuity should exist between R to Y, Rto W and R to G. With the FAN switch to ON position andthe room temperature above the set point temperature continuityshould exist between R to Y and R to G. No continuityshould exist between R to W. With the room temperaturebelow the set point temperature, continuity should existbetween R to G and no continuity between R to Y and Rto W.HEAT OFF COOLAUTOONAUTOONAUTOONABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWABOVEBELOWG Y WX XXXXXXXXXX47
Page 1 and 2: AIR CONDITIONER & HEAT PUMPSERVICE
Page 3: A1. AC VoltageThe unit is a 115VAC,
Page 6: Section A - Installation, cont’d.
Page 9 and 10: A6a. Roof Top UnitsSection A - Inst
Page 11 and 12: A6b. Basement Unitswill have the
Page 13 and 14: A6b. Basement UnitsFREE AREA - is t
Page 15 and 16: Section A - Installation, cont’d.
Page 17 and 18: B1b. Bimetal Relay ControlsCooling
Page 19 and 20: B1d. Comfort Control CenterON/OFF S
Page 21 and 22: B1d. Comfort Control CenterHeat Pum
Page 23 and 24: B1d. Comfort Control CenterFIG. B11
Page 25 and 26: B2. Heat Pumpleaves the outside coi
Page 27 and 28: B2. Heat PumpFIG. B18 13Wait at lea
Page 29 and 30: C1. MotorsRoof Top Units - To check
Page 31 and 32: Section C - Components, cont’d.Th
Page 33 and 34: Section C - Components, cont’d.C9
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Page 41 and 42: Section C - Components, cont’d.RC
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Page 62 and 63: Section D - ConfigurationDucted Ins
Page 64 and 65: Section D - Configuration, cont’d
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