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Re: using fan relay to ad a/c to mobile home
Remember a fan switch has 2- contacts pus coil power (24volts) a normaly open --and a normaly close thus n. o. contacts and a n. c. .. contacts and and you hook the 24volt coil contact to cool and the hi-speed fan switch to the n.o. contacts... SO when it don't calls for cool the n.c. contact wil send power to the low speed wire for heat (red to the fan motor which connects to the temperature control which cycle on the fan when calling for heat! HEY, you didn't give enough information, like WHAT___WHERE___WHEN__WHO ??? ____ model #-- name of unit-- age-- gas fire or electric ---upflw or downflow?
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the fan fill come on with the sequencer (stack switch you call it) it will also come on with the fan relay. on some goodmans the fan relay is the black box on the circuit board. use a jumper to jump red to green, this should bring the fan on sounds like you could have a broken green wire, try using a different wire instead of green
Many have sepaarate speeds for heating and cooling....check it out there should be a heat relay and a cool relay and the motor taps are hooked to each so maybe you can just do a bit of switching wires.....
But, really you probably will have plenty of air flow for the cooling side also if your running that low of a differential on the heating side...
Try it out the worst that can happen is that you will freeze up on the cooling and then you can just switch it back...
Brian, it sounds as if possibly the fan relay is stuck however, if the fan will not shut off I would suggest the following, Follow the wires from the fan to the relay on the relay disconnect the fan wire there and see if the fan shuts down if so there is the problem. If not you possibly have a short in the thermostat wire What can be done is take a small section of thermostat wire and disconnecting the existing thermostat (red 24 v power feed, green, is fan motor control, yellow is compressor control, white is heater control,) once you have disconnected the existing thermostat wires take the short peice of wire and connect it to the terminal block, once this done the other end (do not hook the wiring to a thermostat have the wires bare at the ends about 1/4 inch) Manually connect the red and green wires togather and see if the fan activates. If it does disconnect the r,g wires if the fan still runs then the fan relay is stuck, if not then it sounds as if there is a short in the wiring between the thermostat and the terminal block. Also check to make sure that you have set the thermostat setting itself to either gas or electric since the newer thermostats have the option of being used as gas or electric. Good Luck on your repairs.
In many mobile homes this scenario is very common, less so in permanent homes, but here is how it works; The heat side of your fan which is the low fan speed is not dependant on the thermostat it's heat activated. Your already aware of this to some degree because you had the limit \fan switch replaced. I've taken that approach to that unit myself. In reality what probably is happening is on hot days your unit is warming up by being hit by sunshine and then it clicks the fan on at 140 degrees. This especially happens if the unit is on the roof or a split system in the attic. Remedies; run your A\C to cool it down, keep your attic cooler by way of an attic exhaust fan(which saves you cash anyway). Or if your not regularly using A\C turn breaker off til you need it. In the end there may be something going on, but odds are I'm dead on. Good Luck
The fan and the compressor both run off of the same circuit. Have your husband remove the cover on the condenser coils and check for power at the leads that go to the compressor off of the latching relay. If there is power there, then he needs to check the start capacitor or possibly the thermal overload switch (mounted on side of compressor)
OK< the n/c switch hooks up to the heater box so when the heat close the box switch , youll have power to fan.. The n/o contact connects to highfan (black wire) & the 24 volt yellow wire connects to one side of the fan contacts and the other to common!