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Old 08-19-2016, 11:15 AM   #15
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Yes, they can be recharged, but I wouldn't do it! My front A/C was not cooling and I had it recharged twice, to the tune of about $200, and ended up having to replace it!
Joe & Annette
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Old 08-19-2016, 05:52 PM   #16
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Outstanding effort to getterídone, and a picture is indeed worth a bunch of words.
I couldnít quite make out the model numbers of your units in the pics but judging from the RLA spec. those are rather small (Polar Cubs) heat pumps. (noting the reversing valves) My guess they are in the 9K - 11.5K btu range which is not all that much cooling for most 40í RVís in much of the country in this summer heat.
Unless you really utilize the heat aspect of the units you might go back with straight A/C units. Heat pumps in spite of some theoretical efficiency merits, often add a level of complexity that may not result in any real savings.
No, Iím not baiting HP owners, I was in the commercial HVAC industry for decades. Start another thread if you feel Iím dissíing you.
The branch circuits should be adequate for 13.5k or even 15K replacements (minus the strip heat). 20A TDAC 12-AWG
BTW: many prefer the ducted installs as they can be somewhat quieter, and in theory at least can get more even air distribution. Whether that occurs in application could be debated.
It didn't sound as if you've ruled out whether the compressors are running or not. air temp in, air temp out? inside and out? Thermometer $6 at Harbor Freight, store it in the fridge when you're not using it..
Iíd apply funds to budgeting the replacement of the units. As others have indicated shop labor is so expensive that often repairs arenít cost effective with this disposable technology.

Be well.
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Old 08-19-2016, 10:36 PM   #17
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You say you're not getting good airflow. On different occasions in the past I have had insulation come loose inside the unit and plug up the cooling fins. Folks with better knowledge of your AC can jump in. Can you take the sheet metal off and examine? I have had great luck replacing the crappy insulation which help with the effectiveness greatly.

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Old 08-20-2016, 09:29 AM   #18
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Do some looking around on this forum. Those that have replaced with new encountered other issues with the newer units. Noise. Don't cool as well. Etc.
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Old 08-22-2016, 11:58 AM   #19
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If you replace both units I would go with 15k for both of them. Nothing less. Slice is correct look around on the forum and get an idea what other people have had to deal with. I'd also call around to different repair shops and get pricing. If you don't camp in the winter or cool climates then you don't need the Heat Pumps. That will save you some money.
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Old 08-24-2016, 12:18 AM   #20
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So what job does the Heat pump do? are they different from the furnace that's mounted on the side of the coach? I'm guessing its on the side like my last toy hauler.
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Old 08-24-2016, 08:00 AM   #21
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Originally Posted by stetler View Post
So what job does the Heat pump do? are they different from the furnace that's mounted on the side of the coach? I'm guessing its on the side like my last toy hauler.
The heat pump is built into the air conditioner. Normally the AC unit takes heat out of the air inside of the coach and puts it outside. The heat pump reverses that process. They usually work pretty well down to about 40 degrees, if it gets colder than that you'll likely need to operate the furnace.
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Old 08-24-2016, 08:43 AM   #22
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Any ac unit is a "heat pump" so to speak.

Via tge magic of latent heat one set of coils gets cold (absorbing heat) while the other gets hot (releasing heat).

The direction of flow of the juice inside determines which end does what

Normal the heat is pumped outside.

A unit with a reversing valve can reverse the flow to make the heat blow inside.

Remember your mother complaining about letting the cold air out and cooling the world....In heat pump mode yiu are cooling the outside.

These valves sometimes stick or the coil goes bad.
Tony & Lori
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Old 08-25-2016, 06:17 AM   #23
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Originally Posted by Slice View Post
One is CB the other radio. Yes ac can be charged. Rv shop people will not do it. Easier to sell u a new one. Which don't work as good as the older ones. The unit takes r-22 freon. A line tap is needed. And someone with skill to put the correct amount in.
Find ac guy wanting extra cash onside. Easy peazy. If ur in Houston Tx. Pm me I can help out.

I know i posted this but since i am the ac guy, i just recharged one of my units, MORE than happy with the results,
I know my rear unit was not as Cold as the front via outlet temps at duct work and also the amp draws compared between units.. i found some oil on the evaporator coils which tell me its a very small leak, oz's per year,
I removed freon from unit and welded in a schrader vavle, pulled a deep vacuum, and weighed in the R-22 freon. it takes one and half pounds, ( I also tweeked the freon charge a little) this made the unit work better than when it was installed. The outlet temps went from 52* to 35*, the amount of water now coming out of the drain tube is HUGE., the unit is working 100%.. the coach now with the one unit running and undercover storage is holding at 84* ( set point) but also 30% humidity, which keeps everything nice and dry !
IF your in the Houston Tx area, I can do this service..
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Old 09-11-2016, 12:59 PM   #24
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OK, So this morning I bought a used AC unit to replace the back one that's not blowing at High speed and not very cool.
Question for you guys though. I read somewhere online that the unit must be used with a single Thermostat system. Is this true ? Since I already have the dual thermostat and the wiring already set up from before, Id think that the capacitor is set up already and the dual thermostat I'm running turns on each AC unit at a separate time to allow no over amp charge to my electrical system. That's how it currently turns on.
WHen I look at the part number online from the Dometic website, they don't give a separate Part number for running a single unit on your roof or a dual unit. So I'm leaning towards "It will be fine" Whats your guys thoughts?

here's the one I just bought. its a 13.5K Slim unit, No heat pump. Designed for ducted or Non-D

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Old 09-11-2016, 09:50 PM   #25
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Hey Slice! Just got a new 40' CC and the back AC is barely working. I have a good friend that owns an AC company here in Houston and has plenty of 22, but was hesitant to top mine off. Is it a piece of cake? Any numbers I need to know? Thanks! -Danno
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