05-24-2024, 05:15 AM
Glenn,
If you look at the SCS manual there are some pretty good benchmarks in there to check the AC units before tearing into them. One is the amperage draw per compressor will give you a decent idea if the refrigerant charge is where it needs to be. The second is to measure the inlet and outlet temps. The best you are going to do.
I know my units are charged correctly and the inside and outside coils are clean. Here is some data to help you determine if the existing units can be improved. In 85 degree humid weather the front discharge temp will be 20 degrees lower than the inlet temp, the rear about 12 degrees lower. The rear is always less efficient because of the long ductwork run. In 90 degree LOW humidity weather I have seen the front temp be as much as 40 degrees below the inlet temp, and the rear 20 degrees below.
Stating this another way, with the coach comfortable inside, 75 degrees, the front discharge air will be about 55 degrees, and the rear about 65 degrees with both compressors running in humid southeast conditions. In dry conditions, the front discharge air can be as low as 45 degrees and the rear as low as 55.
Before you ditch a working system, I would do two things. First remove one of the units. This will give yo access to the evap coils for cleaning. You will not believe how nasty they will be. Removing one unit will allow you to crawl into the plenum and clean the other. (Tom is chuckling)
The second thing is to measure the amperage on each leg and compare to the SCS manual. That will give you a rough idea of refrigerant charge. Unless someone has worked on the units, they did not come from the factory with access ports, so it’s not quite so simple as throwing gauges on them.
I am not trying to dissuade you from pursuing other options, just saying to make sure what you have is performing as it should as part of your decision making process.
One more thing, if were are in the south or west, the gen starts when the coach starts meaning if we are rolling the ACs are fired up. Letting the coach heat up and then depending on the SCS units to cool it back down does not work for us. My bride does not like to be hot. Happy wife…….happy driver.
If you look at the SCS manual there are some pretty good benchmarks in there to check the AC units before tearing into them. One is the amperage draw per compressor will give you a decent idea if the refrigerant charge is where it needs to be. The second is to measure the inlet and outlet temps. The best you are going to do.
I know my units are charged correctly and the inside and outside coils are clean. Here is some data to help you determine if the existing units can be improved. In 85 degree humid weather the front discharge temp will be 20 degrees lower than the inlet temp, the rear about 12 degrees lower. The rear is always less efficient because of the long ductwork run. In 90 degree LOW humidity weather I have seen the front temp be as much as 40 degrees below the inlet temp, and the rear 20 degrees below.
Stating this another way, with the coach comfortable inside, 75 degrees, the front discharge air will be about 55 degrees, and the rear about 65 degrees with both compressors running in humid southeast conditions. In dry conditions, the front discharge air can be as low as 45 degrees and the rear as low as 55.
Before you ditch a working system, I would do two things. First remove one of the units. This will give yo access to the evap coils for cleaning. You will not believe how nasty they will be. Removing one unit will allow you to crawl into the plenum and clean the other. (Tom is chuckling)
The second thing is to measure the amperage on each leg and compare to the SCS manual. That will give you a rough idea of refrigerant charge. Unless someone has worked on the units, they did not come from the factory with access ports, so it’s not quite so simple as throwing gauges on them.
I am not trying to dissuade you from pursuing other options, just saying to make sure what you have is performing as it should as part of your decision making process.
One more thing, if were are in the south or west, the gen starts when the coach starts meaning if we are rolling the ACs are fired up. Letting the coach heat up and then depending on the SCS units to cool it back down does not work for us. My bride does not like to be hot. Happy wife…….happy driver.
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)