| [GMCnet] Replacement Roof AC Units [message #179546] |
Wed, 08 August 2012 13:46  |
Richard Brown
Messages: 281
Registered: May 2009
Karma: 1
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Senior Member |
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Just to toss my 2 cents in, I'll let you know what I've learned. My GMC had the original 13.5k BTU A/C on it for almost a month after we moved into it & the thermostat was set about mid-scale. The compressor only ran about half the time and it was always comfortable in the coach. When the fan bearings got noisy, I replaced the original unit with a newer unit that may be a 8.5k BTU Coleman salvaged from a travel trailer. It keeps it comfortable most of the time, but in the hottest part of the day if Carol starts cooking it can get warm in here. The compressor runs most of the time & my electric bill is quite a bit higher.
What I've learned is that when I get a new motor for the original unit, it's going back on the roof. The less time that the compressor runs, the cheaper the bill. By the same token, if you're buying a new unit, get the biggest that is available. I plan on eventually buying a 15k BTU heat pump unit. They are much more pricey, but in the long run you save money on electricity, whether from mains power or Onan.
BTW, I finally found the oil ports on the old fan motor. When it was installed, they were pointed down instead of up, making it impossible to oil. You'd think that someone either at the factory (or the A/C shop if it's a replacement) would've caught that. If I get a new motor installed I will be checking that. I'll most likely swap it out myself & take advantage of Navy experience instead of trusting a "Parts Swapper" to get it right.
Richard & Carol Brown
1974 Eleganza SE
"DILLIGAF"
1174 Hickory Hills Dr.
Murchison, Tx. 75778
903-469-3197
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Richard & Carol Brown
1974 Eleganza SE
1174 Hickory Hills Dr.
Murchison, TX. 75778
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| Re: [GMCnet] Replacement Roof AC Units [message #179568 is a reply to message #179546] |
Wed, 08 August 2012 18:25  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Richard Brown wrote on Wed, 08 August 2012 14:46 |
<snip>
BTW, I finally found the oil ports on the old fan motor. When it was installed, they were pointed down instead of up, making it impossible to oil. You'd think that someone either at the factory (or the A/C shop if it's a replacement) would've caught that. If I get a new motor installed I will be checking that. I'll most likely swap it out myself & take advantage of Navy experience instead of trusting a "Parts Swapper" to get it right.
Richard & Carol Brown
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Don't you just love it!!!
Most friends know that I have worked on refrigeration. So, when their window unit misbehaves, they ask if I could please look at it. I usually do. Most of the time is is either the heat exchangers are plugged with: Cat Fuzz, Dog Fur or Cotton Wood Fluff. Many times it is the fan motor bearings. They may revive with oil or maybe not - no telling.
But what I really love is the sticker in the fan motors. It is either yellow or green (GE or Emerson) and it says - Ready???
"Oil motor bearing twice yearly with SAE 20 Non Detergent oil."
You can read this easily as soon as you remove three dozen sheet metal screws and four sheet metal cover and such pieces. Oh, and yes, the "window" unit has to be on the floor, you can't get those covers off with it where you what to leave it.
And, what normal human has such an oil available? (Well, yes, I do, but we covered that ground a long time back.)
I've checked, my Carrier does not have oil ports, but the Coleman I took off did.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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