Replacement of Main Units
TD831077
VII-11
7
1. Compressors
(a) When the oil inside
the oil separator is
not recovered
–
Total amount of oil
recovered (liters)
(b) When the oil inside
the oil separator is
recovered
Total amount of oil
recovered (liters)
(oil in compressor, oil
separator, etc.)
(2) Air Purging with a Vacuum Pump, refilling the oil/refrigerant
[Measuring the amount of oil]
Measure the amount of oil in the compressor which has been removed and determine whether more oil needs to be
added.
[Air Purging with a Vacuum Pump] (Ref. Fig. A)
1. When the need to perform an operation involving oil refilling arises, connect an oil tank to the end of valve V3 as
shown in the Fig. (A) on page 19.
2. Close valve V9 and open valves V3 and V7, and run the vacuum pump. (The valves provided on both sides of the
oil tank are set to the closed position.)
3. Continue with Air Purging with a Vacuum Pump until the vacuum low-pressure gauge reads 133.3 Pa (1 mmHg).
4. Upon completion of Air Purging with a Vacuum Pump, close valve V7 and stop the vacuum pump.
[Refilling the oil] (Ref. Fig. A)
Set the outdoor unit side of the valve provided on the oil tank connected to V3 to the closed position, and refill the
amount of oil to be added inside the unit. If the oil fails to be refilled, apply refrigerant pressure from the reverse side.
Close valves V1 and V2, and open valve V8 and the valves provided on the oil tank. Upon completion, close all of these
valves.
(Use a weighing scale. The specific gravity is 0.85 or so.)
[Refilling the refrigerant] (Ref. Fig. A)
If refrigerant needs to be refilled, open valves V1, V2 and V8, and close the valves provided on the oil tank and valve 3.
If the refrigerant fails to be refilled, run another outdoor unit, open valve V5 and close valves V1 and V2.
In this case, refill the refrigerant in the form of a gas. (Use a weighing scale. This job arises mainly when the ASTM No.
of the oil is 4 or above.)
If the refrigerant cannot be refilled by taking the steps above, set all the outdoor units to the operation enable mode, then
run all the units and follow the same steps as for refilling the gas.
–
1.8 l (AD COMP)
2.4 l (SC COMP)
8.2 l (PC unit)
4.6 l (AD unit)
=
Amount of oil to be added
(liters) (minus sign denotes
no oil to be added)
=
Amount of oil to be added
(liters) (minus sign denotes
no oil to be added)
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