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

Section C - Components, cont’d.Models 39115.601, 39115.602, 39115.616 & 39115.626The thermostat is a 12V DC controlled system and is abimetal type. It has three (3) switches on the face of thethermostat. On the left side there is a SYSTEM switch andon the right side there are two FAN switches. The top switchis for HI or LOW FAN and the bottom one is for ON orAUTO. This thermostat will operate and air conditioner anda furnace.FIG. C50FIG. C49There are four low voltage wires in the electric box of theair conditioner. They are black, yellow, blue and orange.The black wire goes to negative (-) DC volt power source.The yellow goes to thermostat Y terminal. The blue goes tothermostat H terminal and the orange goes to thermostatG terminal. The DC volt positive (+) from the power sourcegoes to thermostat RC terminal. If a furnace is wired to theheat-cool thermostat, one furnace thermostat wire goes toterminal RH on the thermostat. The other furnace thermostatwire goes to terminal W on the thermostat.Verify the wiring is correct.A 2-conductor cable, 18 to 22 AWG is required for the 12VDC power source. This can be routed into the system ateither the unit of the thermostat.Select the shortest direct route between the power supplyand the system. A negative wire must be supplied. Framework grounding is not adequate.At the unit, route both leads from the 12V DC supply andthe four wires from the thermostat up through the plasticbushing in the bottom left of the electric box for connection.Or at the thermostat, route both leads fro the 12V DC supplythrough the wall and behind the thermostat. Route thefour wires from the thermostat up through the plastic bushingin the bottom left of the electric box for connection.For furnace hookup or use of another thermostat, consultthe installation instructions provided with the furnace and/or the thermostat. Normally, the furnace will connect to theRH and W terminals of the thermostat.ACHEATT’statTerminalRC— —Y, H, GRH & WUnit WireColor— —BlackYellowBlueOrange(FurnaceOption)PowerSource+12V DC-12V DCFieldSupplyWiresTo check the thermostat remove all wires. Next, using anohm meter, with the SYSTEM switch in the COOL positionand the FAN switches in AUTO and HI and the room temperatureabove the setpoint temperature, continuity shouldexist between RC to G, RC to Y and RC to H. No continuityshould exist between RH to W. With room temperaturebelow setpoint temperature, no continuity would exist betweenRC to G, RC to Y and RC to H, and RH to W. WithFAN switches in AUTO and LOW, and room temperatureabove setpoint temperature, continuity should exist betweenRC to G and RC to Y. No continuity should exist betweenRC to H and RH to W. With the FAN switches in ON andLOW and the room temperature above the setpoint temperature,continuity should exist between RC to G and RCto Y. No continuity should exist between RC to H and RH toW.48