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Freezing unit

Freezing unit

(OP)
My issued is the following
One time I noticed that the compressor of the condenser unit freeze, the suction line the part exposed to the athmosphere also freeze, like cristaline the frezze. I let unfreeze and then I turned on the Unit and it was working normally,
The unit was working normally before. but the unit I guess that never arrive to the comfort temperature.
why the compressor of an condenser unit freeze, and liquid line also.
the unit takes many time to arrive to the comfort temperature
see attachment for scheme.
Duct system, the evaporator unit is indoor, the condenser unit is outside,
The corridor area is not climatize, and the thermostat is located rigth there.
The door permit climatize air pass throuth grille door.
The return duct system is in blue color, the return grille is in purple, see image.
Please help me
I appreciate your knowledge
Thanks.

RE: Freezing unit

Call a refrigeration dude.

RE: Freezing unit

Sounds like you don't have the 'cold' being removed from the evaporator. That causes the expansion valve to open more trying to get some cooling and then the refrigerant shoots clear thru the evaporator and ends up cooling the return line back to the compressor. If that goes far enough you can slug the compressor breaking the connecting rod or piston because incompressible liquid refrigerant can make it back to the compressor. Other problems can also cause return icing and poor performance.

So, check that the evaporator is not iced up.
Check that the evaporator fan is moving air thru the coils.
Check that the defrost system is working.
Make sure there are no leaks in the insulation or door gasket allowing a lot of moisture to get in and ice the evaporator.

If after this, it's not cooling or continues to ice the return, get a pro in. And by 'pro' I mean ask around and get a COMMERCIAL refer repair company that at least two other places give two thumbs up on, because about half the refer 'repair' companies out there are nothing but 'gas adders' and part replacers who actually don't understand the important details.

Keith Cress
kcress - http://www.flaminsystems.com

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