10. Compressor
10-2-3. Replacing all compressors in a system
(1)Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separators in all out- door units. Measure the amount of drained oil.
(2)Follow the instructions in
(3)Follow the instructions in “6. Checking for Leakage After Repair” and check for leaks at all outdoor units and in the tubing.
(4)Follow the instructions in “7. Evacuating System” and apply vacuum to all outdoor units and tubing.
(5)Fully close the high- and
(6)Disconnect the manifold gauge from vacuum pump. Connect the manifold gauge to the refrigerant cylinder. Be especially careful that air does not enter the tubing.
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CAUTION
Do not reuse the recovered refrigerant. Use a refrigerant cylinder that contains un- used refrigerant.
(7)Open the valve on the refrigerant cylinder, and open the
However, leave the balance tube fully closed if only a single outdoor unit is installed.
(8)If backup operation was engaged, follow the instructions in “4. Backup Operation” and perform backup opera- tion recovery.
(9)If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible, fully close the
CAUTION
When charging with liquid refrigerant, add refrigerant a little at a time in order to prevent liquid
(10)Fully close the
(11)Remove the manifold gauge.
CAUTION
The connecting port employs a
(12) Follow the instructions in
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