Roof top A/C not cooling properly
Hey all...don't know if this is the best section to post this question but seemed like a great place to start. We purchased a 2007 Cardinal 5th wheel with original Duo-Therm 15,000btu roof air last...
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My main 15K unit in my 2012 trailer started to cool poorly towards the end of last year.... Even began to drip water into the interior when using the "dump" feature.
This unit never did cool as awesome as the 13.5K bedroom unit...
I checked the interior filter - was basically Ok...
Pulled exterior cover and took my air compressor hose to blow out the condenser coils - basically OK as well...
Checked interior plenum for mixing of in/out air... Basically OK, but one spot could use some re-taping.
Checked the exterior box over the evaporator coils - looking for mixing of air... Reaped.
When checking plenum and evaporator coils, found iced up... Could potentially be result of air mixing... But more than likely caused by low refrigerant charge.
Neighbor is commercial heat/air/refrigeration guy... He tested it... Said was basically empty... He charged it (R4) and the exterior line began to sweat and get "beer can cold" like it should.
Nowhere did any line exhibit the typical sign of leakage... Dirty or oily residue.... Has it been low it's whole life? Is there some leak that is somewhere hidden? Who knows.....It's cooling great now., Like it should have all along.
How long will this last? Dunno... But it's been cooling excellently for the last two weeks.
This unit never did cool as awesome as the 13.5K bedroom unit...
I checked the interior filter - was basically Ok...
Pulled exterior cover and took my air compressor hose to blow out the condenser coils - basically OK as well...
Checked interior plenum for mixing of in/out air... Basically OK, but one spot could use some re-taping.
Checked the exterior box over the evaporator coils - looking for mixing of air... Reaped.
When checking plenum and evaporator coils, found iced up... Could potentially be result of air mixing... But more than likely caused by low refrigerant charge.
Neighbor is commercial heat/air/refrigeration guy... He tested it... Said was basically empty... He charged it (R4) and the exterior line began to sweat and get "beer can cold" like it should.
Nowhere did any line exhibit the typical sign of leakage... Dirty or oily residue.... Has it been low it's whole life? Is there some leak that is somewhere hidden? Who knows.....It's cooling great now., Like it should have all along.
How long will this last? Dunno... But it's been cooling excellently for the last two weeks.
