CHECK AND TEST 1

Note


Step 1

Discharge refrigerant: use pliers to cut off charging tube. 

Step 2

Discharge all refrigerant toward the exhaust vent. 

Step 3

Melt brazing material with flame and use a pair of pliers to pull charging tube out. 

Step 4

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

Get more details on brazing requirements, on Annex B1

Step 5

Install quick connector onto rebrazed pipe. 

Step 6

Inject nitrogen of 1.57Mpa through quick connector into pipe. 

Step 7

Leaking test for brazed joints in compressor niche. 

DIAGNOSIS 1


PROCEDURE 1


Step 1

Remove freezer shelf. 

Step 2

Lever 2 screw covers off.

Step 3

Unscrew 2 screws. 

Step 4

Remove air duct:

a. Hold the decorative cover of air duct;

b. Pull air duct out; 

c. Disconnect the terminal of fan motor; 

d. Take air duct away. 

CHECK AND TEST 2


Follow indications in below drawing to test each brazed joint with soapy water in evaporator area behind freezer air duct. 

DIAGNOSIS 2


PROCEDURE 2



Step 1

Clean paint off of brazed joint.

Step 2

Cut off brazed joint with leaking. 

 

Step 3

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

Step 4

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

CHECK AND TEST 3

Step 1

Inject 1.57Mpa nitrogen through quick connector into pipe and apply soapy water to test for leaks again. 

DIAGNOSIS 3


CHECK AND TEST 4

Step 1

Weld a piezometer onto processing tube of compressor. 

Step 2

Charge nitrogen of 1.57Mpa through quick connector into pipe. 

Step 3

Perform leakage test on brazing points and piezometer. 

DIAGNOSIS 4


CHECK AND TEST 5


Charge 1.57Mpa Nitrogen into cooling system, and then observe if there is rust and/or spotted holes on pipes of compressor niche and evaporator area.

If yes, please follow below procedures to do the check and rework. 


PROCEDURE 3


Step 1

Clean paint off of brazed joint of drying filter. 

Step 2

Cut off the brazed joint of drying filter. 

Step 3

Cut off capillary and remove the cut end by shaking. 

Step 4

Weld a new drying-filter. 

Step 5

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

Step 6

Add quick connector onto processing pipe of drying-filter. 

Step 7

Do leaking test on brazed joints of drying-filter and processing pipe on compressor. 

Step 8

Vacuum and recharge.

Click below link to get more details for vacuuming and gas- charging requirements, on  Annex B1

Step 9

Block processing pipe twice by locking pliers. 

Step 10

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

Step 11

Weld the ends and remove the pliers. 

DIAGNOSIS 5


Performance Testing Procedures and Assessment Criteria for FC2 Series

Test conditions

1 Ambient temperature and humidity are the same as natural conditions.

2 Sensor position close to air outlet.
3 Testing time 45 or 60 minutes.
4 Set thermostat at MAX. 

PROCEDURE 4


Tip 1

When reinstalling air duct, move wires out of the way to prevent crushing by air duct. 

Tip 2

After pushing air duct back into position, you should hear a clicking sound. If there is no click, please repeat again. 

Tip 3

Check to see if there is a wide gap between air duct and cabinet.

If gap is large, re-install air duct. 

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