52 / 79
!
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.
10. Cooling Cycle Heavy Repair
10-3. Practical Work for Heavy Repair (continued)
Items
Precautions
4.Refrigerant
charging
(continued)
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)
Lockring
the end of a pinched charging pipe with
lockring
and take a gas leakage test on
the welded parts.
5. Gas-leakage test
Take a leakage test on the welded or suspicious area with an electronic leakage tester.
6. Pipe arrangement
in each cycle
Check each pipe is placed in its original place before closing a cover back-M/C after
completion of work.
9-4. 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.)
