Filter
Top Products
2
2 - 26
10. Compressor
W-2WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
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 “10-3. Removing and Installing Compressors” and replace all compressors in the
system.
(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 low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
(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.
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 high-pressure gauge valve on the manifold gauge.
When charging has been completed with an amount of new refrigerant equal to the amount of recovered refrig-
erant, or when charging with the same amount of new refrigerant has not been completed but no more refriger-
ant will enter the unit, first turn the power OFF at the repaired outdoor unit, then remove the short circuit at the
AP pin (CN102). Then fully open all valves on the gas tube, liquid tube, and balance tube.
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 high-pressure gauge valve on the manifold gauge. Then, while the unit is operating in Cooling
mode, open the low-pressure gauge valve on the manifold gauge and charge with the designated amount of
refrigerant.
When charging with liquid refrigerant, add refrigerant a little at a time in order to
prevent liquid back-flow.
(10) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in “8. Charging Com-
pressor Oil,” and charge with the necessary amount of oil. Also add an amount of oil that is equivalent to the
amount that was drained from the oil separators.
(11)
The connecting port employs a Schrader-type valve. When disconnecting the hose,
pressure will be applied from the refrigerant in the outdoor unit.
(12) Follow the instructions in “10-2-4. Dry core cleaning” and perform dry core cleaning of all outdoor units.
CAUTION
CAUTION
CAUTION
Remove the manifold gauge.