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Old 05-16-2013, 10:47 PM   #1
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Air Conditioner noise

the A/C is working, blowing cold but while running it starts to a make a humming noise while running then it clicks before and after. Kinda like its struggling, Any thoughts?
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Old 05-17-2013, 09:51 AM   #2
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I'm pretty sure there is a starting capacitor on the compressor that helps the motor get through the heavy draw of start up, sounds like yours may be bad/weak.

John B and others that are more versed on troubleshooting will check in with more help shortly.

Mack
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Old 05-17-2013, 08:47 PM   #3
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Need some more info so we know what you have.

Year/model of camper, does it have ducted air or it is all self contained in the ceiling?

Ideally a model number of the AC unit?

Explain this hum, noise and click better. Does it do this when the compressor just starts or has it been running for a few seconds/minutes and then start doing it?

If you turn on just the fan to blow, no cooling, just fan, does the noises still happen?

Trying to sort out a fan motor/blade noise from a compressor noise.

Hope this helps

John
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Old 05-18-2013, 11:17 PM   #4
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I haven't turned it to just blow.. It is mainly at night while running it clicks and sounds like the power changes. Then goes back to normal. It doesn't do this while on "Hi" setting. I'll find the model # ASAP. I have a 2001, 2753 ducted air.
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Old 05-19-2013, 10:16 AM   #5
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Ah good more info

Quote:
Originally Posted by merlin5150 View Post
It doesn't do this while on "Hi" setting.
If the unit runs fine on hi during the day, that really helps on the info. Please confirm as that eliminates a lot of things.

Do you by chance ever notice wetness or water under the unit when you get up in the morning?

The thought I'm thinking of is coil freeze up on the evaporator running on low and at the outside temps of I think it is around ~73 ish. I would have to look it up but there is a point where inside and outside temps can affect the AC unit. The evaporator is the coil inside the camper above the plastic grate where you clean the foam filter.



Your 2001 ducted air unit should be close to mine, just about a 13,500 BTU unit rather than a 15,000 on the longer campers

This post you can see what it looks like up there.
Cleaning the AC coils - (Lots of pic's)

There is a defrost control sensor in this too and they changed over the years where it is located. Mine is the round puck on the left of this pic with 2 black wires coming out of it. This view point is looking down from the roof. The foam filter you take out and clean inside the camper is on the bottom middle of this pic. You can see the foam filter under the control box with the yellow cable heading to it.


If you get a good qty of ice up on the evaporator it makes the unit cycle on and off a lot as the efficiency just went down hill big time from the ice up. And not work right either. The compressor try's to help but it can't and extra vibration may come from this. Our big cold storage (fruit farm) units had this issue when iced up.

I have foggy memory of my dealer telling me not to use lo on the AC unit when we bought our new T2499 in 2003. Later after researching this more I found out more of the reasons on ice up.

I'm not declaring this is your issue, but the more you describe what it does and does not do helps us hone in on this.

An AC unit that runs hi all day long and has no issues, then at night running on low starts having issues, well this leads us into this area of ice up as the blower is running slower and can't keep the evaporator cleaned off fast enough.

Keep telling us more, Do you remember the outside night time temps?

The click and noise, was this like a, click then a long hummmmm then a click and it stop? And about how long was the hummmmm?

I'm not an refrigeration expert but have worked with them in cold storage units. And then researched out and had to fix my own RV AC unit.

We use to have a SOC member who was a refrigeration service guy and knew this stuff inside and out. I have not seen him post in many years now unfortunately.

I'll see if I can dig up the temperature area where these things will cycle themselves hard. I has something to do with the dew point, the temp inside and outside all at the same time. Running the blower on lo aggravates this.

Hope this helps

John
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