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 > AC working right?

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stevenal

Newport, OR, USA

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Posted: 07/10/18 08:33pm Link  |  Quote  |  Print  |  Notify Moderator

My new camper came with a Coleman Polar Cub 9.2.

It got a bit warm here today, so I tried it out. I noticed that even with the control turned to the cool limit, the compressor still cycles off. I just timed it at 1.5 m on and 3 m off and the air in the camper still feels warm. Is this normal? Is there a maximum duty cycle built into the control? Or is the control sensing the cool air in the vicinity of the unit and switching off. All control is on the unit. What's your experience? Thanks.


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Old-Biscuit

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Posted: 07/10/18 10:16pm Link  |  Quote  |  Print  |  Notify Moderator

No it is NOT working correctly

Compressor should NOT cycle on/off until temp set point has been reached
When compressor shuts down the 3M is needed for high pressure side to equalize before compressor starts again

Sounds like unit is 'freezing' up.

Is it humid where you are?
Are you running A/C Unit on HIGH Cool?
Is air discharge Cold?


Is it time for your medication or mine?


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wildtoad

Blythewood, SC

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Posted: 07/11/18 04:06am Link  |  Quote  |  Print  |  Notify Moderator

One other thing to look at is if an air outlet is blowing directly on the thermostat.


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SoundGuy

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Posted: 07/11/18 05:28am Link  |  Quote  |  Print  |  Notify Moderator

wildtoad wrote:

One other thing to look at is if an air outlet is blowing directly on the thermostat.


It's hard to imagine a truck camper would have anything but a direct blow A/C with the thermo mounted on the unit itself as part of the ceiling unit. [emoticon]

wa8yxm

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Posted: 07/11/18 06:11am Link  |  Quote  |  Print  |  Notify Moderator

Three things can cycle it off. In the case of a COLEMAN with "Local" (not a wall mount thermostat) there is one more.. And I'm suspecting that last one.

If your controls are knobs on the ceiling in roughly the middle of the grill....

Remove the knobs. tehn teh grill and filter

There si a small "Tube" with a bulb on the end

ON my Carrier's this was the frost sensor and it was stuck in the evaporator coils but on a COLEMAN with ceiling controls THIS SENSOR DOES NOT EXIST

The sensor that LOOKS LIKE IT. it the room air temp sensor and is NOT supposed to be poked into the condenser.. It's just supposed to hang there in free space. Why they did it that way I do not know and I can see several "issues" with doing it that way Find a place you can zip tie it down and be happy.

THIS ONLY APPLIES TO CEILING CONTROLLED UNITS. If you have a wall-T-Stat this does not, far as I know, apply.


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stevenal

Newport, OR, USA

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Posted: 07/11/18 08:32pm Link  |  Quote  |  Print  |  Notify Moderator

No wall stat, all control is at the ceiling. I removed the knobs, grilles, filters, and shroud this evening. As soon as I dropped the shroud, the compressor came on and stayed on. Put the shroud back up, and the compressor shut off again. No bulb sensors evident.

pnichols

The Other California

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Posted: 07/11/18 08:42pm Link  |  Quote  |  Print  |  Notify Moderator

Another thing that can cause vehicle A/C systems to cycle ON/OFF rapidly and not cool well is a low refrigerant level.

A tiny leak in the system can of course cause this. Rare ... but it can cause what the OP is experiencing.


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ktmrfs

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Posted: 07/11/18 10:29pm Link  |  Quote  |  Print  |  Notify Moderator

I have the same unit in a 14ft cargo trailer. Generally it will run for maybe an hour or more to cool down the trailer then cycle, but cyle is more like 10 minutes on or more then off. I highly suspect from your description and statement that something is amiss in the unit rotary thermostat causing the compressor to cycle. maybe it is getting airflow it shouldn't.


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wa8yxm

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Posted: 07/12/18 10:09am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like you need to clean the intake filter.. Find the T-Stat sensor (look around) on my Coleman the thing was just hanging there in free space but it is an after market install. On my Carrier controlled Advent Air it's stuck in the evap coil.. THat one will cycle if it gets too cold.

stevenal

Newport, OR, USA

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Posted: 07/12/18 01:15pm Link  |  Quote  |  Print  |  Notify Moderator

The unit is brand new, no time for the filters to load up. Plus, when I lifted the shroud back into position and the compressor kicked off, there were no filters in place.

This looks like the setup.

Note that with the shroud in place, cold air from aft (left in the diagram) traveling forward to the front louver and bed area (right in the diagram) is forced around the sides of the boat shaped connection box that houses the thermostat near the bow. I'm wondering if I'm experiencing a design flaw.

To those with working Colemans: Does yours looks like this?

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