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2WAY SYSTEM
Outdoor Unit Repair Procedures
3
4. Recovering Refrigerant
4-3. Recovery of Refrigerant from Entire System
(1) Turn off power to the entire outdoor system.
(2) Short-circuit the AP pin (CN24) on the outdoor control PCB of all outdoor units, then supply power to the
outdoor units.
* By short-circuiting the AP pin (CN24) and supplying power to the outdoor units, the solenoid valve in each unit
is forcibly opened and all remaining refrigerant can be recovered.
(3) If any unit has encountered a power failure, follow the instructions in “4-1. Refrigerant Recovery Procedures
(from Outdoor Units)” and perform refrigerant recovery for the faulty outdoor unit.
(4) Connect the manifold gauge to the high- and low-pressure outlet ports (Schrader-type valves) on any outdoor
unit. (Fig. 5)
(5) Connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder. Quickly connect
each part to prevent air from entering the tubing.
(6) Check that each service valve of the gas tubes, liquid tube, and the balance tube for the outdoor unit has
opened, then perform refrigerant recovery.
* If only a single outdoor unit is installed, the balance tube is not used. Therefore, leave this valve closed.
To determine the 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
SM830253-00_欧州2way7_SM-TRSM.indb 16 16/08/26 19:25:08
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