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!
WARNING
To avoid risk of electrical shock that can cause death or severe personal injury,
disconnect unit from power before servicing unless tests require power.
42
11. Cooling Cycle Heavy Repair
Precautions
Items
• 4) Refrigerant Charging
• Charge refrigerant while operating a compressor as shown above.
• 5) Pinch a charging pipe with a pinch-off pliers after completion of charging.
• 6)
Lokring
the end of a pinched charging pipe with
Lokring
and take a gas
• leakage test on the welded parts.
4.Refrigerant charging.
* Take a leakage test on the welded or suspicious area with an
electronic leakage tester.
5. Gas-leakage test
* Check each pipe is placed in its original place before closing
a cover back-M/C after completion of work.
6. Pipe arrangement
in each cycle
11-4. Standard Regulations for Heavy Repair
1) Observe the safety precautions for gas handling.
2) Use JIG (or wet towel) in order to prevent electric wires from burning during welding.
(In order to prevent insulation break and accident.)
3) The inner case shall be melted and insulation material (polyurethane) shall be burnt
if not cared during welding inner case parts.
4) The copper pipe shall be oxidized by overheating if not cared during welding.
5) Not allow the aluminum pipes to contact to copper pipes. (In order to prevent corrosion.)
6) Make sure that the inner diameter should not be distorted while cutting a capillary tube.
7) Be sure that a suction pipe and a filling tube should not be substituted each other during welding.
( High efficiency pump.)
