My wife and I purchased this older mobile home. The ac was not functioning when we bought it. Purchased a few window units to keep us cool in mean time. I'm not getting power to the thermostat(new battery operated wasn't one when we moved in) or terminal board.. Getting 240v power in and 240 at the contact switch to outside fan and condenser. Manually pressed in plunger the fan and compressor turn on. Upon inspection I noticed what looks like a missing component and one of the wires had electrical tape loosely wrapped around I'm guessing to prevent short. Anyway I attached a picture in hopes someone could help me out. Thanks in advance! Also from 1994 mobile home I'm assuming same for ac unit.
What looks to be missing component. Two unattached wires.
Last edited by PJmax; 10-08-21 at 08:30 PM.
Reason: labeled top pic
That's a Miller/Nordyne electric furnace/air handler.
The three sets of white letters A, B and C are each a heating element.
The 6264040 is a two pole 145°f limit switch. It opens the A and B elements on an overheat.
The missing part would be a single pole 145°f limit switch. Opens only the C element on overheat.
The one in the link is resetable upon tripping. limit switch
The heating parts wont affect the A/C operation. I also labeled your 24v transformer. That would keep the system from operating and cause the stat to be dead. It looks to be missing wires. It should have two 240vAC wires in and two 24vAC wires out.
What else could be wrong?
10-12° difference between vents and return. This season and last. Never tested previously.
Last season large copper pipe at condenser was 64°, this season it's 76°. Both tested several times on different days. Never tested previously.
yes unit was on cool and fans were spinning when tested. Always waited at least 5 minutes after unit switched on to read temperatures.
This unit was installed in 2001, but is rarely used. It's never been charged since installation. Yes, I live in west central florida, but I use my heater more then the cool. It still cools me fine, but it does take slightly longer to cool the house.
Im affected more by humidity then heat. When Im uncomfortable, I set it to 2 degrees cooler then the ambient at that specific time. I might turn it off before the cycle completes or after it completes. Sometimes I let it cycle on and off a few times. Unless it's very hot and sunny outside, one cycle is enough to make me feel fine for a few hours.
When this unit fails, if i can't fix it myself, I might have to resort to window units.
I been reading a lot of service maintenance info online. Some of the things Ive checked:
no air leaks in duck-work.
vents and return are not blocked.
no fluid leaks.
I washed the condenser coils with foaming coil cleaner.
mtr spins free.
inspected electrical connections.
Duel cap read 38/5ufd and should be 45/5, so i replaced it.
I cant clean the evaporator coils with foam, but the top side looks fine.
Id like to do what i can to make this unit last.
tksRead More
10-08-21, 02:52 PM
