Use and Care Manual

MRCOOL DC INVERTER COOLING ONLY CONDENSING UNIT
58
Step 2: Disconnect power
If the compressor needs to be replaced after judging as above, then switch off the outdoor unit and
disconnect the power cable of the outdoor unit. Use insulating tape to wrap the power cable and put a notice
board on the power switch to remind people to be cautious of electric shock.
Step 3: Neaten the electric components
When you detach the compressor wires, temperature sensors and electric heaters, mark them
correspondingly for the convenience of reconnecting them.
Step 4: Discharge refrigerant
Discharge refrigerant from the system. Discharge simultaneously from the high pressure side and low
pressure side. Do not discharge too fast (It should take more than 12h to completely discharge the refrigerant);
otherwise, large quantity of lubricant will escape from the system together with the refrigerant.
Step 5: Detach the compressor
Check the condition of the damaged compressor, including its position and model.
If the information of the compressor is confirmed, check the oil quality.
(1) If the oil is clear and impurities-free, we consider that the oil of the system is not polluted. Meanwhile, if
we confirm that the valves and pipes are also normal, then we can replace the compressor only. For the
removal of compressor, please refer to the section: Removal of Major Components.
How to check oil quality:
1) After the compressor is detached, put it on a solid ground and shake it at an angle of 30~45° to
ensure that the contaminant at the bottom of the compressor can be poured out.
2) Place the compressor at a position above the ground level and then pour out the oil from the air
outlet of the compressor. Collect the oil in a transparent container. The amount of oil should be over
150ml.
NOTE:
①
The axial direction of the compressor should not slant at an angle larger than 20° to the horizontal
direction.
②
Prevent the compressor from falling.
③
Put a transparent container (over 150ml in volume) under the exhaust pipe to collect the
compressor oil, thus we can see the oil quality.
3) Put the container of compressor lubricant in a bright location and see if there is impurity and
discoloration. Sniff at the compressor lubricant. Normally, there is no pungent smell.
(2) If the oil is contaminated, replace the compressor and the gas-liquid separator.