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

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Section C - Components, cont’d.C16e.Relay, SPDT (single pole/double throw) is used on Models39424.601, 39115.626,39125.601, 39335.601 and39335.636.On Model 39424.601 it is used to complete 115 volt ACcircuit to Circuit 2 compressor. On Models 39115.626,39125.601, 39335.601 and 39335.636 it is a furnace blowerrelay.The relay has a 115 volt AC coil.Terminals 1 and 3 are the coil terminals. When the coil(terminals 1 and 3) is NOT energized (no power to terminals1 and 3), continuity should exist between terminals 4to 5; and no continuity between terminals 2 to 4.When the coil (terminals 1 and 3) is energized (power toterminals 1 and 3), continuity should exist between terminals2 to 4 and no continuity between terminals 4 to 5.FIG. C26C16g.Relay, SPDT (single pole/double throw) is used onModels 39115.XXX, 39325.XXX,39335.XXX and 39424.601.On Models 39115.XXX, it controls HIGH and LOW FANspeeds. On Models 39325.XXX, 39335.XXX and39424.601, it opens the control circuit for the fan motorwhen the coil is energized.Note: Incorrect wiring to the thermostat can energize therelay coil on heat pump models 39325.XXX, 39335.XXXand 39424.601.The relay has a DC volt coil. To check the relay, first verifyall AC volts have been turned off to the unit.Next, remove the wires from COM and NC terminals. Verifythe relay coil is not energized (no DC power). Continuityshould exist between terminals COM and NC and no continuitybetween terminals COM and NO. Next, energize therelay coil with DC volts (10 to 16). Continuity should existbetween terminals COM and NO and no continuity betweenCOM and NC. If the above checks are correct, the relay isgood - DO NOT replace it. If the above checks are notcorrect, the relay is defective and should be replaced.FIG. C28C16f.Relay, SPDT (single pole/double throw) is used onModels 39325.XXX and39335.XXX.On Model 39325.XXX it is used to complete the 115 voltAC circuit to the reversing valve.On Model 39335.XXX is used to complete the 115 volt ACcircuit to the reversing valve and to the furnace blower relaycoil. The relay has a DC volt coil.Terminals 1 and 3 are the coil terminals. When the coil(terminals 1 and 3) is NOT energized(no power to terminals 1 andFIG. C273), continuity should exist betweenterminals 4 to 5; and no continuitybetween terminals 2 to 4. When thecoil (terminals 1 and 3) is energized(power to terminals 1 and 3), continuityshould exist betweenterminals 2 to 4 and no continuitybetween terminals 4 to 5.C16h.Relay (9T91/120V)(SPDT)The relay is used on basement air conditioner Model 39224and basement heat pump Model 39424 ONLY.The relay has five terminals. Two terminals are not identified;they are the coil terminals. When the coil is not energized(no power to the coil terminals), continuity shouldexist between COM and NC and no continuity betweenCOM to NO.When the coil is energized (power to the coil terminals),continuity should exist between COM to NO and no continuitybetween COM to NC.FIG. C2936
Section C - Components, cont’d.There are four relays used in Models 39224 and 39424.Two are used in the reversing valve circuit and are designatedas HR (heat relay) on the wiring diagram. Two areused in the furnace blower circuit and are designated asFB (furnace blower) on the wiring diagram.C16i.Relay, 2-Pole Furnace BlowerThe relay is used on basement air conditioner Model 39125and Basement heat pump Model 39335 ONLY. The relayhas five (5) terminals. It is used to complete a circuit tothe furnace.Terminals 1 and 3 are the coil terminals. When the coil(terminals 1 and 3) is not energized (no power to terminals1 and 3), continuity should exist between terminals 4 to 5;and no continuity between terminals 2 to 4.FIG. C30When the coil (terminals 1 and 3) is energized (power toterminals 1 and 3), continuity should exist between terminals2 to 4 and no continuity between terminals 4 to 5. Thisrelay is used to energize the furnace blower any time thecompressor is energized. This circuit has been added toenhance both the cooling and heating operation.Note: This circuit will not work with all furnaces.Before using this circuit, check with the furnace manufacturerfor proper wire connection to the furnace. Other componentsmay or may not be required. Read and follow theinstructions provided with the furnace.Instructions for Furnace ConnectionsThe following furnace connection instructionsonly pertain to one specific furnacemanufacturer, and may not apply to your installation.Run a 12 volt DC positive lead to one of the gray wires inthe unit electrical box and secure with an approved connector.Run a second lead from the furnace blower motor or terminalboard to the remaining gray lead in the unit electricalbox. Secure with an approved connector.C16j.Relay, (DPST)The relay is a double pole, single throw and controls thefan motor in the roof mounted unit. When the AUX HEATmode is selected or the outside temperature is too cold forHEAT PUMP operation and automatically goes to auxiliaryoperation, the relay will interrupt the circuit to the fan motor.When COOL, OFF and HEAT PUMP modes are selected,the relay coil is not energized. When AUX HEAT mode isselected the relay coil is energized with 12V DC.To check the relay, first remove the wires form COM andNC terminals. Next verify the relay coil is not energized (noDC power), continuity should exist between terminals COMand NC and no continuity between terminals COM and NO.Next energize the relay coil with DC volts (10 to 16). Continuityshould exist between COM and NC, If the abovechecks are correct, the relay is good - DO NOT replace it.If the above checks are not correct, the relay is defectiveand should be replaced.Note: Verify the thermostat is wired properly from the furnace,as incorrect polarity on the furnace thermostat wireswill energize the relay coil and keep the fan motor fromoperating in the roof mounted unit.FIG. C31C16k.Relay, Double ThrowThe relay controls AC power to the reversing valve. Thereare two different relays used. One relay has a 12V DC ratedcoil and is used on all Duo-Therm Heat Pumps except themechanical control types. The mechanical control Duo-Therm Heat Pumps use a relay that has a 120V AC ratedcoil. Both relays have five (5) terminals.Terminals 1 and 3 are the coil terminals.When the coil (terminals 1 and3) is not energized (no power to terminals1 and 3), continuity should existbetween terminals 4 to5; and no continuitybetween terminals 2 to 4.When the coil (terminals 1 and 3) isenergized (power to terminals 1 and3), continuity should exist between terminals2 to 4 and no continuity betweenterminals 4 to 5.37
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
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Page 62 and 63: Section D - ConfigurationDucted Ins
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10-19-00 Air Conditioner Heat Pump Service Manual - Bryant RV ...

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