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Old 07-06-2012, 03:30 PM   #15
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Originally Posted by perryg114 View Post
I edited the post so you probably read the post before I added the last little bit of information. I think faster than I type.

Perry
That's probably right. I went back a couple of times, but was probably seeing a cached version. It appears correctly now.
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Old 07-06-2012, 04:00 PM   #16
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Gene: The modern ones may cycle the compressor before getting down to the set temperature, but I'm guessing that unless it detects something wrong (over- or under-temperature on some sensor, etc) it'll run the compressor full tilt until it gets down to the set point. I'm certain my old one works that way.
I don't know why they would cycle the compressor as described, but it could happen. Maybe it is good to rest the compressor periodically for short periods. We have a newer thermostat (2007) which does more things and can be set as low as 40˚. We leave the fan on whenever we are using he A/C and I don't usually notice when the compressor cycles because I've learned to ignore it. Besides, when setting up, no one is sitting in the trailer counting cycles.

So long as we are talking about A/C, several things come to mind—why are RV A/C's noisier than window units at home? Maybe it is because of the confined space with many reflective surfaces. Second, why do they cost so much more than residential window units? And this reminds me of something I read once—horizontal furnaces used in condos and fit in the ceiling, wear out faster than a regular vertical furnace sitting on a floor; does this apply to RV A/C's? Why hasn't anyone designed an RV A/C that sits in the sidewall, like the fridge, and disperses cooled air through some ducts in front, middle and rear?

Gene
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Old 07-06-2012, 04:54 PM   #17
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I have a somewhat related question. My parents have a 78 international 31'. The a/c starts out blowing nice and cold but then after about 20 min it starts blowing warm air. What gives?
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Old 07-06-2012, 05:38 PM   #18
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It is 100 today. Air coming out of AC is 54. Temp inside trailer is 76.
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Old 07-06-2012, 05:40 PM   #19
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Where is the thermostat set? I believe the recirc fan runs continuously when the unit is on. The compressor kicks in and out based on the ambient temp as compared to the T stat setting.
The thermostat on my AC unit is built into the control panel of the unit. It has a dial with a scale from 1 to 7. 7 being max temp.
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Old 07-07-2012, 09:58 AM   #20
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They use to make a kit to covert a standard window unit into an RV roof top unit. The window unit sat on the roof like it would in a window and there were ducts that ran to the inside. I think they are noisyer because the roof vibrates and amplifies the noise. You are also in a confined area where sound reflects.

A compressor should not cycle on and off if it is over 70 degrees in the trailer with the thermostat full cold. If it does then the sense lead on the thermostat is in the wrong place. It can be moved by removing the cover and changing the position of the thin tube coming out of the thermostat. I put mine outside the air box and it solve my short cycling problem. Some thermostats can be tweeked internally to reduce this problem. You don't want the thermostat to see any of the output air.

Perry

Quote:
Originally Posted by CrawfordGene View Post
I don't know why they would cycle the compressor as described, but it could happen. Maybe it is good to rest the compressor periodically for short periods. We have a newer thermostat (2007) which does more things and can be set as low as 40˚. We leave the fan on whenever we are using he A/C and I don't usually notice when the compressor cycles because I've learned to ignore it. Besides, when setting up, no one is sitting in the trailer counting cycles.

So long as we are talking about A/C, several things come to mind—why are RV A/C's noisier than window units at home? Maybe it is because of the confined space with many reflective surfaces. Second, why do they cost so much more than residential window units? And this reminds me of something I read once—horizontal furnaces used in condos and fit in the ceiling, wear out faster than a regular vertical furnace sitting on a floor; does this apply to RV A/C's? Why hasn't anyone designed an RV A/C that sits in the sidewall, like the fridge, and disperses cooled air through some ducts in front, middle and rear?

Gene
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