CHECK AND TEST 1

Step 1

Plug in - the compressor starts, but protection is activated immediately, and it cannot run normally.

Step 2

Put hand onto compressor - no shaking can be felt.

Step 3

Measure the AC voltage of the compressor with a multimeter.

Step 4

Wait a few minutes, power on and off several times consecutively - the compressor starts but activates protection. Wait a few minutes, power on and off several times consecutively  the compressor starts but activates protection.

DIAGNOSIS 1

SAFETY WARNING:
MAKE SURE DETECTORS DO NOT TOUCH EACH OTHER. DO NOT TOUCH LIVE PARTS WITH HANDS.

CHECK AND TEST 2

Step 1

Cut off capillary to discharge refrigerant.

Step 2

Cut off exhaust pipe and suction pipe.

Step 3

Power on the compressor and test exhaust pressure coming from exhaust pipe with a piece of paper.

DIAGNOSIS 2


CHECK AND TEST 3

Step 1

Braze a new drying-filter.

Step 2

Add quick connector onto processing pipe of drying-filter.

Step 3

Inject nitrogen (1.57Mpa) through quick connector into pipe.

Step 4

Follow the order on drawing below to cut off brazed joint, one by one, at high pressure end.

NOTE


Step 5

Every time you cut off one joint, check whether the gas pressure
from suction pipe has dropped or not.

DIAGNOSIS 3


PROCEDURE 1

Note


Step 1

Use a bigger copper tube to connect 2 ends of brazed joint.

Step 2

Weld the 2 ends. Please find more details of brazing requirements on Annex B1

Note


Step 3

Re-braze a copper tube onto processing tube of compressor.

Please find more details of brazing requirements, on Annex-b1

Step 4

Install quick connector onto re-brazed pipe.

PROCEDURE 2

Step 1

Weld exhaust pipe and suction pipe onto compressor.

Step 2

Inject nitrogen (1.57Mpa) through quick connector into pipe for at least
3 min to blow remaining refrigerant away.

Step 3

Test for leaks on brazed joints of drying-filter and processing pipe on compressor.

Step 4

Vacuum and recharge.

Please get more details of vacuuming and gas- charging requirements on Annex B2

Step 5

Block processing pipe twice by locking pliers.

Step 6

Leave locked pliers attached to second block and shake to cut off the remaining pipe.

Step 7

Braze the ends and remove the pliers away.

CHECK AND TEST 4


DIAGNOSIS 5


PROCEDURE 3

Step 1

Unscrew terminal cover.

Step 2

Remove terminal cover.

Step 3

Disconnect all terminals.

Step 4

Unscrew earthing wire.

Step 5

Unscrew nut of compressor.

Step 6

Install a new compressor on top.

Step 7

Weld the joints of suction and exhaust pipes.

PROCEDURE 4


Step 1

Re-braze a copper tube onto processing tube of compressor.

To get more details on brazing requirements, please go to Annex B1

Note


Step 2

Install quick connector onto re-brazed pipe.

Step 3

Clean away paint on brazed joint of drying-filter.

Step 4

Cut off the brazed joint of drying filter.

Step 5

Cut off capillary and remove the cut end by shaking.

Step 6

Braze on a new drying-filter.

Step 7

Inject nitrogen (1.57Mpa) through quick connector into pipe for at least
3 min to blow remaining refrigerant away.

Step 8

Add quick connector onto processing pipe of drying-filter.

Step 9

Test for leaks on brazed joints of drying-filter and processing pipe on compressor.

Step 10

Vacuum and recharge.

Please get more details of vacuuming and gas- charging requirements on Annex B2

Note


Step 11

Block processing pipe twice by locking pliers.

Step 12

Leave locked pliers attached to second block and shake to cut off the remaining pipe.

Step 13

Braze the ends and remove the pliers.

CHECK AND TEST 5


DIAGNOSIS 6

GO BACK TO COMPONENT LIST