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Old 09-25-2014, 07:43 PM   #1
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A/C Edumacation required

Hi all,

I have a 2005 Itasca Suncruiser 37F and am now in hot hot Mesa, AZ. The A/C runs 24/7 but never cools below mid 80's. I see conversations about 2 compressors but am not sure what I have. My questions are, is this a normal cooling capacity when temps are 100 or more?, Do I have 2 compressors? Is it possible to re-charge the A/c myself? If so, is their a pdf on where/how? I have done my cars before so feel ok with handling it.

Thanks
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Old 09-25-2014, 08:15 PM   #2
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osgoor,

Lots of Qs, I'll try to answer some... looking at the brochure for your model, you have essentially the same basement air I have.

The unit has two compressors built-in to it. When turning on you should hear the first one kick in, the second one 15-30 seconds later. The AC owners manual has all the info on when/what turns on, I won't repeat it all here.

The unit is sealed, there is no recharge ability.

A 20-degree drop is pretty much in range for the basement AC. I've seen a couple threads about owners in high-heat areas replacing one of their square ceiling vent fans with a roof AC unit to add cooling. Not trivial, requires running power etc. See this thread as an example...

http://www.irv2.com/forums/f101/supp...dding+roof+air

One thing you might check... many have reported a separation of the ductwork in the rear of the RV where the duct runs from the basement AC to the roofline. While the AC is running try to feel up under the back cap to see if you have any cold air coming out there, which would indicate a leak.

Hope this helps.
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Old 09-25-2014, 08:24 PM   #3
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Your basement unit should drop the air temp by 20 degrees from the return air temp (not outside ambient temp). If your not seeing at least an 18 degree drop across the evap coil the coil could need cleaning or the filter may need to be cleaned or renewed.
Google Airxcel / RVComfort and snoop around their site to get the service manual for your unit. The manual will advise how to ascertain that the #2 compressor is coming on.
Heat gain through the walls and ceiling is hard to do anything about but the windshield and windows heat gain can be reduced by covering them. Hope all this helps you get below 80.
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Old 09-25-2014, 08:59 PM   #4
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Thanks... We have changed the filter located under the bed. This was a 14 x 20 filter. I assume this is the correct filter to replace. I also looked at the coils at the rear (passenger side) and it looked clean... I can blow air through that t see if it is really clean. I will also feel underneath for a cold air leak... How do you open the cover to the air conditioner?

As far as the compressors, When I turn on the A/C, it takes about 10 - 15 seconds before I hear a single click and then the air comes on. There is no second click. Is there an easy way to confirm both compressors are coming on line?

Thanks again
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Old 09-25-2014, 09:24 PM   #5
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Run the A/C while operating from your generator. The ampmeter on the One place panel will show about 24 amps when both compressors are running and about 14 amps with only 1 compressor running and fan speed on high.

That meter only indicates amps while the generator is operating or when you are plugged into a 30 amp shore power source. It will not indicate while plugged into a 50 amp service.
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Old 09-25-2014, 09:31 PM   #6
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Quote:
Originally Posted by Harry B View Post
Run the A/C while operating from your generator. The ampmeter on the One place panel will show about 24 amps when both compressors are running and about 14 amps with only 1 compressor running and fan speed on high.

That meter only indicates amps while the generator is operating or when you are plugged into a 30 amp shore power source. It will not indicate while plugged into a 50 amp service.
Will do and thanks
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Old 09-26-2014, 11:12 AM   #7
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Quote:
Originally Posted by KIX View Post
Your basement unit should drop the air temp by 20 degrees from the return air temp (not outside ambient temp). If your not seeing at least an 18 degree drop across the evap coil the coil could need cleaning or the filter may need to be cleaned or renewed.
Google Airxcel / RVComfort and snoop around their site to get the service manual for your unit. The manual will advise how to ascertain that the #2 compressor is coming on.
Heat gain through the walls and ceiling is hard to do anything about but the windshield and windows heat gain can be reduced by covering them. Hope all this helps you get below 80.

Just to add to what Kix says: place a thermometer at the air return intake, near your air filter or on it and after a few minutes put that thermometer at one of the cold air returns. The air coming out should be about 20 degrees cooler.

I don't think you can get to the compressor area without pulling the air conditioning unit. At least that's the way it is on mine. There is a small panel you can remove that gives you access to the circuit board and capacitors.
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Old 09-26-2014, 11:52 AM   #8
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What u see from outside is condenser cool. You must remove unit to clean EVAP coil
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Old 09-26-2014, 12:07 PM   #9
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Look under compartment door for 2 screws and on next comp door jamb area for 3 screws
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Old 09-26-2014, 12:14 PM   #10
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A lot of heat comes through the windshield. Do you get full sunshine on the windshield?

I carry an external mask for the windshield which helps cut back some heat and keep the windshield curtains pulled during the day.
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Old 09-26-2014, 09:07 PM   #11
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Quote:
Originally Posted by osgoor View Post
Thanks... We have changed the filter located under the bed. This was a 14 x 20 filter. I assume this is the correct filter to replace. I also looked at the coils at the rear (passenger side) and it looked clean... I can blow air through that t see if it is really clean. I will also feel underneath for a cold air leak... How do you open the cover to the air conditioner?

As far as the compressors, When I turn on the A/C, it takes about 10 - 15 seconds before I hear a single click and then the air comes on. There is no second click. Is there an easy way to confirm both compressors are coming on line?

Thanks again
There are 2 filters under the bed so if you only replaced 1 then go back and check again.
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Old 09-26-2014, 10:20 PM   #12
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Quote:
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A lot of heat comes through the windshield. Do you get full sunshine on the windshield?

I carry an external mask for the windshield which helps cut back some heat and keep the windshield curtains pulled during the day.
Yes, we face NE and have a windshield cover and keep the curtains pulled.
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Old 09-26-2014, 10:22 PM   #13
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Originally Posted by SuperGewl View Post
There are 2 filters under the bed so if you only replaced 1 then go back and check again.
Under the bed in our rig there is only one filter. It is a 14 x 20 size and is located in the lower left corner of the bed frame. Where would I find the other filter?
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Old 09-26-2014, 10:23 PM   #14
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Look under compartment door for 2 screws and on next comp door jamb area for 3 screws
A bit confused... do I need to remove the entire A/C unit to clean the coils? That would not seem to be a good design.
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