boguslaw

RV Products Roof Mounted A/C

7 posts in this topic

I have a pair of these roof mounted units, like most, and the front can deliver a 30 deg temp drop while drawing 11 amps, the rear can only drop the air temp by 10 deg and will only draw 5.2A. I took it to a place and they said I need a new compressor and if so, change out the whole unit.

I'm guessing they are right but just wanted a second opinion. It seems odd that it works, partially, but needs a new compressor. Is there a loading valve that isn't operating correctly(it may be integral to the compressor and the prognosis is the same). I had the cover off and it looks brand new so I hate to replace it but if that's the answer....

It's a RV Products model 9024, the low profile with the external fan.

Someone please tell me if I should toss this unit for another or if there is a possibility to saving it.

Jim Boguslaw

Country Coach Tribute 2007

Share this post


Link to post
Share on other sites

We were looking at the amp draw on a unit just installed on my coach. At full cold- draws the 11 amps, even with the heater. At fan mode- just below 5- your thermostat doesn't seem to be wanting your compressor to engage.

Share this post


Link to post
Share on other sites

We were looking at the amp draw on a unit just installed on my coach. At full cold- draws the 11 amps, even with the heater. At fan mode- just below 5- your thermostat doesn't seem to be wanting your compressor to engage.

I would think the compressor is running because there is a temp difference of 10 degrees. If the compressor was not energized the air would be about the same going in as coming out.

Share this post


Link to post
Share on other sites

There are alot of factors that affect the temperature drop across a cooling coil. Humidity is the big one. Air fllow is critical and the sheet metal needs to be installed correct and use a sealant tape between the sheet metal joints. Being the refrigerant system has welded connectins I would not expect you to be low on refrigerant. Most coils are designed for a ten or twenty degree drop. The air coming off the condernsor should be twenty degrees above the ambient temperature. That is how old timers use to charge a system. Today charging requires a thermometer and pressure gage. Then you set it up by super heat. I would recommend a second repair shop. Some residential servicemen will service it for you. R.S.E.S. certifications are a good way to sort out serviice men. (Refrigeration Servce Engineers Society)

Share this post


Link to post
Share on other sites

What is the ballpark cost of replacing a roof unit?

Share this post


Link to post
Share on other sites

As a followup, I took it to Premier MotorCoach in Tucson who said it needed a compressor, therefore the whole unit should be replaced as it is not cost effective to replace a compressor. I bought one on line from PPL Motorhomes in Houston for $812 plus $175 shipping and installed it myself in a few hours. I don't know what a motorhome service place would charge.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now