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04-23-2019, 03:15 PM
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#1
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Member
Join Date: Mar 2017
Posts: 45
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Can we recharge roof AC units ourselves?
Hi folks...after waiting 15 mins + two different times w/ Dometic cust service and getting no one, and looking on the RV systems forum, and looking trhu the owners manual and not seeing it, I thought I'd try here...I always get good feedback on this forum...
Sooooo...I am wondering can you charge up the a Dometic Rooftop AC unit like we do with our cars? Or is it a pro only deal?
Thanks,
Kevin
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04-23-2019, 03:27 PM
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#2
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Senior Member
Join Date: Mar 2010
Location: N. E. Ohio & Lady Lake Fl.
Posts: 1,120
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Rv air conditioners do not come with the Shrader valves on the low and high side. So the answer is No.
__________________
Ron WD8CBT
I started out with nothing and I still have most of it left 
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04-23-2019, 03:36 PM
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#3
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Senior Member
Join Date: May 2018
Location: Freeport
Posts: 560
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Powderman is right. We just had to replace our rear AC unit. Had it been serviceable I have all the equipment to do it but no such luck.
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04-23-2019, 03:38 PM
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#4
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Senior Member
Join Date: Dec 2010
Location: Ocala, FL
Posts: 468
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Quote:
Originally Posted by powderman
Rv air conditioners do not come with the Shrader valves on the low and high side. So the answer is No.
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Someone who services ACs could add the valves but if the unit needs refrigerant it has a leak so adding it would be the band-aid approach.
__________________
2002 Fleetwood Fiesta 31H--F53, 2002 Toyota Tacoma Xtra cab, drive line disconnect.
2 cats: "Rusty"--male, 22 lb, 13 year old red mackerel tabby with white DSH, & "Penny"--female, 15 lb, 11 year old black and white DLH.
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04-23-2019, 03:39 PM
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#5
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Senior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Oct 2017
Location: Ringgold, GA.
Posts: 384
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You don't say but I was wondering if your Dometic units run?? Do they just not blow cold?? If they DON'T run it might be a hard start relay or switch. I had several guys tell me about that when I was having problems with mine.
__________________
Curtis "EZ" Smith
40' 2006 Holiday Rambler Ambassador
2019 Jeep Grand Cherokee Trailhawk Hemi Toad
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04-23-2019, 04:57 PM
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#6
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by KConnington
Hi folks...after waiting 15 mins + two different times w/ Dometic cust service and getting no one, and looking on the RV systems forum, and looking trhu the owners manual and not seeing it, I thought I'd try here...I always get good feedback on this forum...
Sooooo...I am wondering can you charge up the a Dometic Rooftop AC unit like we do with our cars? Or is it a pro only deal?
Thanks,
Kevin
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Well, can it be done? Of course it can. Man made it, man can fix it. The real question of course is "Is it cost effective"? The answer to that is most likely No, unless you have the expertise to do it yourself. In simple terms, adding in the schrader valves, hooking up a vacuum pump and gauges and recharge the system.
I used to repair those little window AC units (same type of product) in my former life in North Africa by the bushel. But, we had nothing but time and money was no object. Not to mention new units were scarce and it was dam hot outside.
One of the killers with these things is Low Starting Voltage. A good EMS with low voltage cut out will pay for itself.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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04-23-2019, 05:08 PM
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#7
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Senior Member
Join Date: Apr 2018
Posts: 672
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Quote:
Originally Posted by EZRider800
You don't say but I was wondering if your Dometic units run?? Do they just not blow cold?? If they DON'T run it might be a hard start relay or switch. I had several guys tell me about that when I was having problems with mine.
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Right! first of all see if compressor is running. You can do this by removing roof cover, start just the fan only, they have someone turn it on to cold, as cold as it can go. If you feel a change in noise, and you feel a humming from compressor that means its running. At that point, cheaper to replace. If nothing changes it could be some other electrical problem.
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04-23-2019, 05:50 PM
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#8
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Senior Member
Join Date: Dec 2017
Location: Sacramento, California
Posts: 1,402
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It depends on how old the unit is. I had an older motorhome that had the correct ports and I added the appropriate freon.
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04-23-2019, 06:25 PM
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#9
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Senior Member
Join Date: Aug 2016
Posts: 3,400
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Short answer is NO.
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04-23-2019, 06:41 PM
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#10
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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May want to explain what issue you are having. Low refrigerant isn't the only issues these units have!
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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04-23-2019, 10:56 PM
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#11
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Senior Member
Join Date: Apr 2018
Posts: 672
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Quote:
Originally Posted by Bahamaniac
It depends on how old the unit is. I had an older motorhome that had the correct ports and I added the appropriate freon.
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What type of refrigerant dod you use?
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04-23-2019, 11:15 PM
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#12
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Senior Member
Monaco Owners Club Vintage RV Owners Club
Join Date: Sep 2014
Posts: 993
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Troubleshoot and yes, the service valves can be added.
If you are getting them replaced, let me know if you are condemning them and I will pay for shipping for the "bad ones".
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04-24-2019, 01:23 AM
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#13
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Senior Member
Join Date: Dec 2017
Location: Sacramento, California
Posts: 1,402
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Quote:
Originally Posted by Dom
What type of refrigerant dod you use?
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You have to date the unit to ensure use of the proper freon. I had a collection of older freon bottles and had the proper solution to add.
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04-24-2019, 07:02 AM
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#14
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Senior Member
Join Date: Apr 2018
Posts: 672
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Quote:
Originally Posted by Bahamaniac
You have to date the unit to ensure use of the proper freon. I had a collection of older freon bottles and had the proper solution to add.
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If its a older unit as you say, they only used one refrigerant
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