Travel trailer rooftop A/C Unit

[re2ell]

Had my first experience today with a Coleman (travel trailer) rooftop A/C unit and it left me totally dumbfounded!

Repaired several leaks, evacuated, recharged etc., when checking system pressures....was flaburgasted! Ambient was mild, virtually no load on evaporator, however, I have never seen an R-22 A/C system operate at 30 degree evap with 90 degree condensing!

Anyone available to shed light on this matter. Would be greatly appreciated!

Ah!, and it does have a thermistor embeded in the evaportor, reckon it might protect the compressor from liquid slugging or such because the evap operates so cold!?

[Yuma]

Think of them as a window unit.....

I hate them because out here the plastic tops dry up and if you look at them wrong they break! And walking on a travel trailer roof is fun in it's self. Do enough of those and you start to like trailers... (LOL)
The main thing I found is to keep the coils clean ( Like normal) and they work OK... I try not to put gauge's on them because you'll pull the entire charge out if your hoses are to long.

Good Luck,

Yuma,