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Old 05-27-2016, 05:14 PM   #1
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A/C not cooling as I think it should

So I have two ACs. A 15K and a 13.5K. The 15K blows ice cold. The 13.5K blows "cool". Definitely not as cold as the big one. Any troubleshooting I can try?

The filters are not clogged.
Set the thermostat down to 60 degrees.
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Old 05-27-2016, 05:17 PM   #2
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Make sure the coils are clean.
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Old 05-27-2016, 05:19 PM   #3
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Ok, how do I do that?
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Old 05-27-2016, 05:25 PM   #4
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Quote:
Originally Posted by FCStreamer View Post
So I have two ACs. A 15K and a 13.5K. The 15K blows ice cold. The 13.5K blows "cool". Definitely not as cold as the big one. Any troubleshooting I can try?

The filters are not clogged.
Set the thermostat down to 60 degrees.
Check the temperature as it goes immediately into the AC, and as it immediately leaves the AC.

After that AC has run about 15 minutes or so, the temperature difference should be a minimum of 15 degrees.

Do this test when the trailer is basically cooled down. That will give you better readings.

If the temperature difference is less, then there had to be a small Freon leak. Recharging that AC is very simple.

Andy

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Old 05-27-2016, 06:10 PM   #5
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I did a YouTube search for you,
Search,
RV Living: how to keep your rooftop AC unit clean and functioning
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Old 05-27-2016, 06:27 PM   #6
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You have a new trailer with new A/C -- the coils will be clean IMO, as will the return air filters. To find out what's up, you need to get a small battery digital thermometer with a long probe end, like a meat thermometer, which is also the kind that HVAC guys carry around all the time.

Measure the air temperature in the trailer before cooling, the temperature of the air coming out of the A/C, and the outdoor temperature. Only when you have all three will you have some specific data from which to make a diagnosis.

In very general terms, your A/C units should show a drop of about 25 degrees from the intake return air temp, and the discharge cool air. If you don't get this drop, your refrigerant might need changing or charging. I am guessing Colonial tested this, so I would call them ASAP. They are open tomorrow.

As to the outside temp, it will obviously affect how quickly the A/C can cool your trailer. Airstream trailers are not particularly well insulated (thin wall thickness mainly), so any outside temps above 90 F will be challenging unless you leave both A/C units on full time, and are very careful about not opening doors, vents/skylights and and windows much IMO.

Also it you are on the road for a long day, and the inside of the trailer is really hot, it pays to get parked, put the A/C on high, and then go to a nearby bar and restaurant for a couple of hours until the trailer cools off IMO.
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Old 05-27-2016, 06:53 PM   #7
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To be precise, the 'delta T' or differential between the return air measured at the return air intake and the cool exhaust air measured at the unit's output ( in this case the first available output duct) should be between 18-22 deg. F in any RV air conditioner after the compressor has been operational for a minimum of 15 minutes.

While elevated outside ambient temperature will have an effect on the amperage draw of the compressor, it has little relevance to the delta T measurement as it is a differential between interior air temps.

If your new unit does not measure within this RV standard, there is a good possibility that you have leaked refrigerant.

The definitive test is an amp draw measurement at the compressor, but unless you have a true RMS amp clamp type meter, that is best left to the techs.

In any event, you have a 2 year Dometic warranty, so it will be covered and probably replaced.

Just be sure to take your temp measurements with only the unit in question operating.


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Old 05-27-2016, 06:56 PM   #8
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I realize this is elementary, but you have a new to you trailer. Make sure both zones are set for A/C. If the rear air is not cold, it may be on fan and recirculating cold air from the front A/C. Ask me how I know this.
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Old 05-27-2016, 08:39 PM   #9
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Thanks for the suggestions. Yes, I made sure it was set to AC. I guess I'll have to investigate my options to have it serviced under warranty. My AS is covered by the original 2 year warranty until October. I have to submit the transfer paperwork, and then figure how to connect a tech with my AC. Sigh....
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Old 05-27-2016, 09:12 PM   #10
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Thanks for the suggestions. Yes, I made sure it was set to AC. I guess I'll have to investigate my options to have it serviced under warranty. My AS is covered by the original 2 year warranty until October. I have to submit the transfer paperwork, and then figure how to connect a tech with my AC. Sigh....
I would still recommend measuring the temperatures suggested earlier, as your expectations for the performance of the A/C may be based on a good strong residential system, which RV's cannot measure up to. If the two units are producing the Delta T drop suggested by lewster in the range of 20 F, then they may be functioning correctly.

If only one of the units is working correctly, at least you will have identified the weak link in the chain for repair, and you will be wiser for knowing about the Delta T etc.. Better get used to this process, as the challenges of owning an Airstream are many and varied.

As are the joys!



Have a great trip home, and a good long weekend!

Peter
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Old 05-28-2016, 12:52 AM   #11
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FWIW the 13.5k front AC on our 2016 dual AC 27' FC failed in Mesa AZ. Very similar symptoms as you describe.

Apparently there are no serviceable parts or ability to recharge the unit. It was replaced under warranty by Dometic. We had to wait five days for it to be delivered from California. Took Desert Autoplex in Mesa about 3 hours to swap it out.
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Old 05-28-2016, 09:34 AM   #12
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FWIW the 13.5k front AC on our 2016 dual AC 27' FC failed in Mesa AZ. Very similar symptoms as you describe.

Apparently there are no serviceable parts or ability to recharge the unit. It was replaced under warranty by Dometic. We had to wait five days for it to be delivered from California. Took Desert Autoplex in Mesa about 3 hours to swap it out.
I'm having the same problem with my 2016 FC 27' with dual AC, it also may need to be replaced. Hopefully I won't have to wait for the replacement to be delivered since we are going to JC for repairs. Sounds like there may be a number of domestic 13.5 AC failures on newer units?
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Old 05-28-2016, 10:12 AM   #13
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Same with mine - almost every 2015/2016 owner I have run across have lost the smaller unit shortly after delivery


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Old 05-28-2016, 03:16 PM   #14
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Yes Domstic 13.5 units low profile have a problem, have to replace as sealed units, **** made in china my be low price but we are paying the price by having to wait.
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