Panasonic U-10MF1E8 Service Manual page 57

5. Recovering Refrigerant
Refrigerant
recovery cylinder
5-3. Recovery of Refrigerant from Entire System
(1) Turn off power to the entire outdoor system.
(2) Short-circuit the AP (Air Purge) pins (CN102) on the outdoor control PCB of all outdoor units, then supply power
to the outdoor units.
* By short-circuiting the AP pins 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 "5-1. 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. 9)
Remaining refrigerant may cause internal pressure. Check that each valve on the
CAUTION
manifold gauge valves is tightly closed. The connection port uses a Schrader-type
push-to-release valve.
(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 suction line, discharge line, liquid line, 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.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.
Liquid tube service port
(For 7.94mm-dia. connector)
Manifold gauge
Lo Hi
Refrigerant
recover unit
Outdoor Unit Repair Procedures
Discharge tube service port
(For 7.94mm-dia. connector)
Suction tube service port
(For 7.94mm-dia. connector)
Fig. 9
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3-WAY SYSTEM
2