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2WAY SYSTEM
Outdoor Unit Repair Procedures
3
4. Recovering Refrigerant
(2) If the remote controller is not available for maintenance of the outdoor unit
1 Determine the outdoor unit where the unit No. setting (SW5) on the outdoor unit control PCB is set to No. 1.
2 Short-circuit the MODE pin ("COOL" side of CN40) on the outdoor unit control PCB of the No. 1 unit.
3 Short-circuit the CHK pin (CN23) on the PCB to start test run operation.
4-2-2. Refrigerant recovery procedures (1) (using indoor unit ball valve)
(1) If a ball valve with a service port has been provided in the indoor unit as shown in Fig. 4, follow the instructions
given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in
“4-2-3. Refrigerant recovery procedures (2).”
(2) After running the unit in Cooling mode for about 5 minutes as described in “4-2-1. Cooling operation (for all
units),” fully close the liquid tube ball valve.
(3) Run the unit in Cooling mode for 10 to 20 minutes more.
(4) Fully close the gas tube ball valve, and stop the operation of all units.
(5) Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder
with each other. (Fig. 4) Do each connection quickly to prevent air from entering the tubing.
(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.
To determine completion of refrigerant
recovery, follow the instructions that
came with the refrigerant recovery unit.
Remaining refrigerant may create internal pressure, therefore care should be
taken when connecting the hoses.
CAUTION
NOTE
Hi
Manifold
gauge
Refrigerant recovery cylinder
Outdoor
unit
side
Gas tube
Liquid tube
Indoor unit
Refrigerant
recovery
unit
Service port
Ball valve (separately purchased)
Lo
Fig. 4
SM830253-00_欧州2way7_SM-TRSM.indb 12 16/08/26 19:25:05
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