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Old 03-04-2021, 05:29 PM   #1
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Roof a/c maintenance ?

Hi folks, I know that an automotive air conditioner compressor needs to be cycled occasionally to lubricate the system. Does the same hold true for the roof mount a/c unit? Thanks for your input!
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Old 03-04-2021, 05:48 PM   #2
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Nothing needs to be done since it's just a mini version of a house a/c.
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Old 03-04-2021, 06:10 PM   #3
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The only maintenance I know about is to keep the inside filters clean.
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Old 03-04-2021, 06:44 PM   #4
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Originally Posted by Happy wife / happy life View Post
Hi folks, I know that an automotive air conditioner compressor needs to be cycled occasionally to lubricate the system. Does the same hold true for the roof mount a/c unit? Thanks for your input!
I've always tried to run my air conditioner at least a couple of times during the cooler months. Even if it doesn't help by getting the freon moving around and redistributing lubricant in the bearings, it will verify that the AC is in working condition.

It would be much better to find an AC problem in the cooler months than having to deal with a broken air conditioner in the heat of summer.
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Old 03-04-2021, 07:18 PM   #5
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I once had a Dometic roof top and every year after sitting for a couple of months, I would have to go reach up inside and spin the squirrel cage blower to break the surface tension on the shaft and get the motor running.

After that it worked flawlessly until it sat without running again.

My current Coleman Mach III's have never done that.
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Old 03-04-2021, 07:33 PM   #6
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Some good information in this video. Itís on my To Do list before the summer season.

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Old 03-04-2021, 08:03 PM   #7
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While youíre thinking about the AC it would be a good idea to check those 4 bolts to make sure their snugged down ever so lightly
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Old 03-04-2021, 09:42 PM   #8
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While youíre thinking about the AC it would be a good idea to check those 4 bolts to make sure their snugged down ever so lightly
So Tunce, how you you tighten the bolts on a 15K Whisper Quiet AC? I don't see any access on my living room AC.
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Old 03-04-2021, 10:52 PM   #9
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I never run my ac in the winter

As for maintenance;
- Clean the ac filters every 5-7 days of use.
- Annually check the roof bolts
- Clean the roof top coils, periodically.

I have not adjusted my roof bolts in years, but I check them annually.
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Old 03-05-2021, 04:20 AM   #10
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So Tunce, how you you tighten the bolts on a 15K Whisper Quiet AC? I don't see any access on my living room AC.
Thanks,
Jeff

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If you donít have the shroud directly underneath he unit on 5e inside then Itís bolted down from the top, probably with lag screws or bolts. Nothing to do. I suppose you could go up there and wiggle he unit and make sure itís secure.
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Old 03-08-2021, 10:35 AM   #11
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If you donít have the shroud directly underneath he unit on 5e inside then Itís bolted down from the top, probably with lag screws or bolts. Nothing to do. I suppose you could go up there and wiggle he unit and make sure itís secure.
Thanks Shall36. Already checked for looseness on the roof and all seems okay.
Happy RVing,
Jeff
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Old 03-08-2021, 10:49 AM   #12
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While youíre thinking about the AC it would be a good idea to check those 4 bolts to make sure their snugged down ever so lightly
This same guy mentioned 50 inch pounds of torque to those lag bolts. Iíd like to see where he got that from; I like knowing exactly how much to tighten them up and Iíll buy a inch/pound torque wrench for this job.

Iím going to install a RV Airflow device in my rig when it arrives.
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Old 03-08-2021, 11:32 AM   #13
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This same guy mentioned 50 inch pounds of torque to those lag bolts. Iíd like to see where he got that from; I like knowing exactly how much to tighten them up and Iíll buy a inch/pound torque wrench for this job.

Iím going to install a RV Airflow device in my rig when it arrives.
Now mine tightens down from the inside and they really only need to be tightened to just a little snug . If you look at my picture from above youíll see the yellow tab that represents the thickness of the foam gasket. Check and adjust yearly and after about the 4th year it might be 1/2 compressed and by the 5 year it SHOULD be changed out. The change out is easy and you can DIY.
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Old 03-08-2021, 11:35 AM   #14
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Two thoughts,

First is you shouldn't run the A/C in cold temperatures (not speaking about heat pumps though). The oil in the refrigerant doesn't flow as good the colder it gets which is bad for the compressor. I would run the A/C in the winter time only if the outside temperature was above 55~60. (I would check your manual though first).

Second thought regarding how tight the 4 bolts should be to secure the A/C. When installing a new A/C or a new gasket, there are tabs on the gasket to watch and when they are flush with the roof then that is what is recommended regarding tightening the 4 hold down bolts. This represents a compression of the seal (gasket) that is about ~60% compression of the gasket. However, with time the gasket can and will settle a bit (compress) and that can cause the bolts to become loose (vibration over time could do that as well), therefore if your bolts are loose then as I have seen in the documents for my previous RV (not sure with my current A/C), a recommended torque value is 40~50 in lbs which sounds reasonable. You don't want to tighten them too much as that further compresses the gasket beyond what it was designed for and will cause it to fail earlier than it would otherwise, but loose bolts also can allow for vibrations (excess noise) and ultimately leaks. On my current RV, I simply snugged them down with a small 4" ratchet until I could feel and see the bolts were snug, if you are not familiar with what 50" lbs feels like then a small torque wrench certainly could be of value. In fact I have a small torque wrench so part of my spring maintenance will be to use it this time, I can tell you that 50 inch lbs are not very much, so for those who find the bolts loose, just snug them a little (about a half turn after you feel tightness on the bolt), which is about as much as you can using only two fingers and a 4" ratchet, better to have a torque wrench for sure. It would also be a good time to inspect the gasket, they don't last forever, but without over tightening the A/C, the gasket should last 10+ years (perhaps a lot more in fact). (My advice is based on my experience, which is limited in this area so just use my information as a guide and verify with your A/C owners manual first for any recommendations they have)
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Old 03-08-2021, 01:29 PM   #15
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I have an inch pound torque screwdriver and 50 inch pounds seemed way too much. Squished my gasket. Backed it off to 20 and that seemed about right. After I installed the RV Airflow device I couldn't see the adjustment tabs but the bolts seem pretty snugged up at 20 inch pounds. I'll check them again after my next trip.
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Old 03-12-2021, 12:15 PM   #16
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This same guy mentioned 50 inch pounds of torque to those lag bolts. Iíd like to see where he got that from; I like knowing exactly how much to tighten them up and Iíll buy a inch/pound torque wrench for this job.

Iím going to install a RV Airflow device in my rig when it arrives.
So my RV Airflow device came in today, and on the instruction sheet for it I see they recommend torquing the lag bolts to 40-50 inch pounds.
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Old 03-12-2021, 12:59 PM   #17
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As I stated above I set my Wheeler torque screwdriver for 40 pounds and that was way too much. I marked the mounting bolts before I removed them and when I hit 40 inch pounds the marks on 2 of the bolts were almost 2 inches below where they were before removal. Plus, my gasket was very compressed. I backed off all four bolts, set the screwdriver for 20 inch pounds and re-torqued the bolts. That setting seemed just about right.

I had to also trim one of the duct inserts to fit one on my duct openings. The other one was a perfect fit. The foam insert is a very tight fit and on my first try it got to the point where I was afraid to push on it any harder. I removed it and the mixed up some dish washing liquid and water, coated the foam and the duct inserts, and then it slid right into place.

It actually doubled the amount of air coming from my ceiling vents. I used a digital wind meter to measure my wind speed before and after. Before my readings were between 8 & 10 mph. After the install ALL of my ceiling vents were showing just under 20mph air flow! Couldn't believe it. Next week we are going to Quartzsite, AZ and it's predicted to be in the mid 80's, so it will be a good first test.

Good luck on your install.
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Old 03-12-2021, 03:34 PM   #18
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I’m sure it will be one of many ‘moments’ I’ll have when the rig comes in. I’ve done this before (too many times), I know I’m in for a sore back, busted knuckles, and ‘memories’.
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Old 03-12-2021, 04:02 PM   #19
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What??! It's a piece of cake, took me about 40 minutes using just a Philips screwdriver, a nut driver for the 4 mounting bolts, my torque screwdriver, and some silver tape. I had to trim one of the plastic duct inserts using a razor knife, but that was easy as well.
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Old 03-12-2021, 04:07 PM   #20
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No, sorry I meant this install along w/ vent shrouds, screen door handle, helper spring adjustment, possible sway bar install, etc. This is just one of the the ‘things’ I have to do when it comes in. Hence the back, knuckles, likely cuss words, etc.
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