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About Howard Livingston
Expertise
Can answer questions on electrical control circuits, power supply,airflow & distribution, electrical components,refrigerant problems,gas, electric & propane furnaces.No boiler or refrigerator experience.Just HVAC questions please.
Experience
35 years experience in residential & light commercial repair & installation.
Organizations
None
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None
Education/Credentials
Mechanical Engineering degree.
Awards and Honors
None
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Central air frigidaire B4VM-X36K-B
Expert: Howard Livingston - 9/7/2008
Question
I added a 6in duct booster and got a Packard PR293Q relay
but I can't figure out how to wire it to the air handler
would appreciate any advice.
Answer
Get a 24v coil, single pole, double throw relay.( NO)I assume the fan motor is 120v. Find a 120v source, black,hot, white common. White wire to the white on the motor. Black wire to one side of the relay switch. Other side of the relay switch to black on the motor.Now, with 3- 16 to 18 gauge wire, connect one to red wire, one to white, one to green at the furnace At the relay coil terminals, connect red wire to one terminal. The other terminal, connect it to a 2 way switch with a common terminal(rotary type). Now connect the white wire(heat( to one terminal at the rotary switch , green wire(from the furnace) to the other terminal. Label the green wire position COOL, the white wire terminal HEAT.Of coarse locate this switch in an accessible place.This switch needed to prevent feed back from the relay to the fan speed since the cool speed is faster that heat speed.And the heat speed is a separate circuit.So, call for heat, turn the rotary to HEAT,call for cool, turn to cool. Got it ?? Hope you're relay is this type, need to add the rotary.
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