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Old 08-10-2019, 03:06 PM   #1
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Chronic A/C cycling in Newmar Dutchstar

I have been battling an A/C issue for several months and have been at the dealership now for more than three weeks. Here is a summary.
We own a Newmar Dutchstar 2009 4010 that we purchased from dealer in CT just over a year ago and have been full time since 11/2018. We have 2 Dometic Penguin heatpumps (M/N 630515.331D - 13,500 BTU R-22) with CC1 control system and aqua hot domestic water and heat. Single supply air duct front to back on MH as well as return air duct. Experiencing erratic operation of a/c. Lost communication which prevented a/c during hot spell. Replaced the CC1 control with new - no change, still very inconsistent operation. Finally got proper reset and communication established and when we approach setpoint (within 2-3 degrees) the units start short cycling (on 5-10 minutes, off 4 minutes or so). Brought to dealer and was told it needed one control board in front heatpump. This was replaced and short cycling continued. Dometic suggested several remedies. 1-New communication wires; 2-New 12 volt wiring away from other wiring; 3-RF interference from lighting. Replaced all ballasts in fluorescent lighting. Ran 12v wires from house batteries up to each heatpump on outside of coach. Ran communication wires along roof and into window to eliminate RF interference. Put each heatpump on its own CC1 controller to separate problems. Replaced control boards in each unit from another RV with same control system and age. Replaced run capacitors in both. Short cycling continues as you approach setpoint in both units. If we set the temp very low on thermostat, both units will operate continuously until they get to setpoint, whether we set temp at 67 or 74. Then the cycling begins. We (and the dealer and Dometic) are at a loss to remedy this situation - or is this operation expected with the older dometic CC1 control system?
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Old 08-10-2019, 03:51 PM   #2
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I am not familiar with that system in particular but this sounds like the dead band is set too narrow.....in the controls system or the units themselves. Although, I'm not so sure that mine don't operate too much differently on a really hot day.

Paul
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Old 08-11-2019, 06:00 AM   #3
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Having a cold air vent pointed towards the temperature sensor can cause this. Redirect the deflector and/or try some blue painters tape over the thermocouple sensor at the wall and see if things improve. Easy to try.
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Old 08-11-2019, 06:57 AM   #4
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My two do the same thing. My living room one has been cured by buying a new temperature probe and installing it literally sticking out the opposite end of my AC intake.

My AC intake shroud has been modified to make things much quieter so there is no exit slots around the area where the little thermostat sticks its matchlike head out.

No more cycling up front.

The rear does exactly as you mention. Get the outside temp and inside temp close together and the darn thing cycles. Set the temp to 70 and it seemingly never shuts off. Turn it up to 72 and it works better.

I have NOT moved the rear temp sensor pickup. I have chased this frustrating issue for so long that I cannot remember if I experimented with connecting a new one in there.

One thread recently decided it was "electrical noise" causing the problem. They diagnosed it by using a battery at the AC itself to substitute the coach supply.

I surmised that turning off shore power would eliminate any "electrical noise" but my AC still short cycled.

So perhaps instead of "electrical noise", it is a low voltage issue that happens just as the AC cycles on. If that is the case it could be input capacitors on the control board not handling the momentary drop. I have considered adding a capacitor right at the input. Health issues have kept me off the roof for months so my experimenting has been slow.

One thing I want to try is flipping a switch on my control board inside the AC unit. It is the "differential" switch.
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