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MojaveJoe · 12-13-2018, 06:58 PM

Need a little help.
Did some minor damage to the fins on the condenser taking disassembled unit off the roof of my fifth wheel, alone.
Would like to bench test the unit on the ground before putting it back on the new roof. Need help with what needs to be hooked up to the four terminals that normally connect to the thermostat. Thinking I can just supply the right jumpers/power to the four terminals to get it running and check for leaks, etc.
The AC control box terminals are marked B-,Y, GH,GL.
The thermo wires connected to these were Blue, Yellow, Green, Gray, respectively.
Any and all advice and experiences welcome.

My AC and fiver were built in 2003.

Old-Biscuit · 12-13-2018, 08:40 PM

MojaveJoe · 12-14-2018, 06:38 PM

Thanks for the wiring diagrams OB.
They confirmed what I thought I needed to do. Will pull old thermostat from RV to run my AC on the bench. If still OK I will replace the old Tstat with the newer version, digital. Hope to do this test tomorrow. Followup to come.

MojaveJoe · 12-16-2018, 02:13 AM

Update:
Made up a wiring harness today according to above diagrams and ran my AC on the bench for 5 hours straight. The coldest discharge air got down into the 30s and stayed there for hours. Conclusion, despite crushing some of the fins on the condenser no freon leaks. So after a good cleaning and Microair upgrade this baby is going back up on the roof for another 14 years of service. Probably not all with this old codger though. LOL

Old-Biscuit · 12-16-2018, 10:54 AM

Quote:

Originally Posted by MojaveJoe

Update:
Made up a wiring harness today according to above diagrams and ran my AC on the bench for 5 hours straight. The coldest discharge air got down into the 30s and stayed there for hours. Conclusion, despite crushing some of the fins on the condenser no freon leaks. So after a good cleaning and Microair upgrade this baby is going back up on the roof for another 14 years of service. Probably not all with this old codger though. LOL

Good deal...........

Just curious -----did you measure Return Air Temp?

A/C Unit Delta T is roughly 18*F-20*F
*Difference between Return Air Temp and Discharge Air Temp measured using a bulb thermometer (Infrared Guns do not measure air temps)