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Supermarket Refrigeration - How to Troubleshoot 99% of Compressors ( 25 step guide!!)
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1) Turn off main power.
2) Turn off compressor.
3) Is your compressor isolated?
4) Contactor
Ohm across
Look for pits
5) Does your control voltage pull in the contactor?
HPS
LPS
OIL SAFETY
Compressor internal overload
6) If there is a head fan ohm out to ground if it's connected to the contactor auxiliary.
Ohm at the contactor
7) Ohmed out the legs of the compressor
8) Ohmed compressor to ground
OHmed at the compressor ( Remove the leads)
9) Ohm out the legs of the compressor
10) Ohm compressor to ground
11) Are connections tight ?
12) Is the compressor filled with oil if so empty it.
13) Isolate the compressor suction and take the suction side pressure.
- Is it liquid pressure?
-See if the suction pressure rises in the compressor
-The goal should be to stay at suction -pressure when isolated.
14) Does there appear to be flood back?
15) Are any of the circuits on the suction side of the system hot or are any of the compressors suction side hot.
16) Before starting make sure there's oil at least enough to lubricate the compressor.
17) Before starting get compressor information.
18) Careful turn on compressor
DO NOT STAND IN FRONT OR NEAR COMPRESSOR OR COMPRESSOR CONTACTOR.
19) How does the compressor sound
20) Take an amp draw when the compressor is running
- Compare to specs.
21) Is the discharge hot and the suction cold.
22) Does it hold a compressor efficiency test
for the next steps !!!!¡
Only if you have cause do the following!
Do not needlessly open up a compressor!
23) Take of the head and look at the reeds.
24) See if the piston moves freely.
25) Look for signs of damage
Black Goop
Pieces of steel
Scored piston wall.
over load replacement!! below
2) Turn off compressor.
3) Is your compressor isolated?
4) Contactor
Ohm across
Look for pits
5) Does your control voltage pull in the contactor?
HPS
LPS
OIL SAFETY
Compressor internal overload
6) If there is a head fan ohm out to ground if it's connected to the contactor auxiliary.
Ohm at the contactor
7) Ohmed out the legs of the compressor
8) Ohmed compressor to ground
OHmed at the compressor ( Remove the leads)
9) Ohm out the legs of the compressor
10) Ohm compressor to ground
11) Are connections tight ?
12) Is the compressor filled with oil if so empty it.
13) Isolate the compressor suction and take the suction side pressure.
- Is it liquid pressure?
-See if the suction pressure rises in the compressor
-The goal should be to stay at suction -pressure when isolated.
14) Does there appear to be flood back?
15) Are any of the circuits on the suction side of the system hot or are any of the compressors suction side hot.
16) Before starting make sure there's oil at least enough to lubricate the compressor.
17) Before starting get compressor information.
18) Careful turn on compressor
DO NOT STAND IN FRONT OR NEAR COMPRESSOR OR COMPRESSOR CONTACTOR.
19) How does the compressor sound
20) Take an amp draw when the compressor is running
- Compare to specs.
21) Is the discharge hot and the suction cold.
22) Does it hold a compressor efficiency test
for the next steps !!!!¡
Only if you have cause do the following!
Do not needlessly open up a compressor!
23) Take of the head and look at the reeds.
24) See if the piston moves freely.
25) Look for signs of damage
Black Goop
Pieces of steel
Scored piston wall.
over load replacement!! below
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