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I need to add a/c to mobile home using a fan relay

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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!

Posted on Sep 07, 2008

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Hi, I have an older mobil home with a Colman AC


Your unit uses both the capacitor and a contactor (relay) to start your compressor and motor. With the indications you are giving it would either be the capacitor or the contactor - and since you have already changed the cap - then replace the contractor!

NOTE: We always recommend that you change the capacitor and relay at the same time, because they seem to fail at about the same time.

Jul 28, 2011 | Coleman Air Conditioners

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I have a Coleman Presidential 7670 furnace in a mobile home. customer said it came on a couple of times by itself. I ran new wire, fan won,t shut off. Replaced fan switch, fan still won't shut off....


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.

Dave in Texas

Sep 01, 2009 | Air Conditioners

1 Answer

I have an intertherm central air unit in my mobile home that does not change fan speed when I click the fan speed switch. I've checked the fan relay which is good and energized in the ac mode which should...


You may ahve a bad switch but sometimes when they are worked on the servicrman bypasses the switch. Fan speeds are color coded black high blue med yellow med high and red low. Just for your info. Russ

Aug 16, 2009 | Air Conditioners

2 Answers

Ruud AC fan won't shut off


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

Jul 12, 2009 | Ruud UBHC Air Conditioner

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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?

Sep 09, 2008 | Air Conditioners

1 Answer

Coleman mobile home electric furnace


Peace,




It seems you need hands on servicethis time !
ngafm
Bless You,
Please leave me a rating before you sign off!
Thank You

Sep 07, 2008 | Air Conditioners

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