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Old 07-08-2016, 02:13 PM   #1
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Air condition

seems like the front air condition never turns off! we are parked under shade but seems like the front ac runs way to much and should cycle on and off. anyone else have this problem?
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Old 07-08-2016, 02:53 PM   #2
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Jumping on here. My rear a/c seems to cycle on and off more often then it should, front seems fine. Do those little white sensor things ever go bad or do they need any kind of maintenance or cleaning?

Thanks, Terry
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Old 07-08-2016, 03:06 PM   #3
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Terry -- The sensors are generally very solid and rarely go bad. Perhaps the cycling is related to differences in temperature settings or concentration of heat, i.e. does the sun hit the rear more than the front. Or perhaps the air vents provide cool air that tend to point at a sensor, cooling it down quickly and when the A/C turns off the sensor picks up the warmer surrounding air temp and causes the A/C to turn back on. Several things might cause one A/C unit to cycle more than another but the sensors are usually stable and have a very low failure rate.
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Old 07-08-2016, 03:33 PM   #4
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Terry, we had custom baffles added by Classic Coach Works in Florida who pointed out that some output vents and the sensor on the ceiling of the bedroom area are very close to the input grill of the AC unit. The result is that the AC unit tends to come on and off in shorter periods because it thinks the desired temperature has been reached quickly.

We now shut off the first vent forward of the grill and to the rear of the grill. It seems to have helped although the baffles changes the return air flow to a side draft as opposed to the direct up draft. The baffles also serve to quiet the sound somewhat. Even without baffles you might try shutting off those vents. You'll get plenty of cool air through the remaining vents.
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Old 07-08-2016, 07:01 PM   #5
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The front area has a LOT more glass then the rear, so I would expect the front A/C to be running more than the rear. I am not saying you are not having problems, just that the front is 2/3 rds of the coach. Also as I mentioned the front has a lot more glass as well as the kitchen, both are adding some amount of heat to the coach. And if you are pointed south, that windshield will really pump up the heat.
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Old 07-08-2016, 07:04 PM   #6
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Many years ago there was a thread on here about leaks (open gaps!) where the air conditioners sit on the ductwork. This allows the cool air to escape and go right back into the return flow. Tape up those gaps with aluminum duct tape (the good stuff) and you will get much better airflow and cooling.

That said, my front A/C does tend to run more than the back one. More space to cool. But it does cycle depending on the outside temp.
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Old 07-08-2016, 07:08 PM   #7
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I usually set the bedroom temp about 2 o r more degrees lower so it will contribute to the total cooling.
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Old 07-08-2016, 08:48 PM   #8
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Agree--sensor near the outlets in the bedroom can contribute to cycling, adjust the vents or look at moving the ceiling sensor toward the back closet--use the vent channel to re-route the wire.
Good idea to check the medal duct work below the unit--lots of leaks coming from the factory install. Couple feet of foil tape will solve this issue.
Also note that on earlier Alpines, the sensor [little white cap thing] is mounted in the window trim, above the driver's seat. If the sun is on the front of coach this sensor will give false readings due to proximity to heat from the side window, the side of coach, and the front windshield.....
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Old 07-08-2016, 08:57 PM   #9
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Quote:
Originally Posted by dennismhamm View Post
seems like the front air condition never turns off! we are parked under shade but seems like the front ac runs way to much and should cycle on and off. anyone else have this problem?
Dennis, your sensor for the front A/C is located above the driver's seat. When sitting, depending upon where the sun is, it will get VERY hot there. I routinely set the front A/C for 84 and then put the fan on medium speed and run it continually. That really is the best thing for an A/C to have the air circulating, because A/C doesn't need to run as often because circulating air will fill cooler. In the winter, when it is very cold, we've had to run smaller space heater on low to keep the furnace from coming on to often - - again the sensor is located near that cold front winder.
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Old 07-09-2016, 10:27 AM   #10
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Dennis, do you have your A/C set to Auto, High or Low? If on High or Low, the compressor will start and stop but the fan will keep running.
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Old 07-09-2016, 10:38 AM   #11
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Janet and Todd Legg, it is set to auto. I think it might have something to do with where the temp sensor is located.
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Old 07-10-2016, 09:09 PM   #12
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We never set ours more than 20 degrees lower than the outside temp. We also have a box fan on high angled to the ceiling. At night we lower as needed.
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