Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 74

3. Recovering Refrigerant
Refrigerant
recovery unit
Refrigerant recovery cylinder
3
3-3. Refrigerant recovery from Entire System
(1) Turn off power to the outdoor unit.
(2) Short-circuit the AP pin on the outdoor control PCB, then supply power to the outdoor unit.
* By short-circuiting the AP pin and supplying power to the outdoor unit, the solenoid valve is forcibly opened
and all remaining refrigerant can be recovered.
(3) Connect the manifold gauge to the high- and low-pressure outlet ports (Schrader-type valves) on the outdoor
unit. (Fig. 4)
CAUTION
(4) Connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder. Quickly connect
each part to prevent air from entering the tubing.
(5) Check that each service valve of the gas tube and liquid tube for the outdoor unit has opened, then perform
refrigerant recovery.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.
Manifold
gauge
Lo Hi
Remaining refrigerant may create internal pressure, therefore care should be
taken when connecting the hoses.
Outdoor Unit Repair Procedures
Fig. 4
3 - 8
Mini VRF SYSTEM
Low-pressure outlet port
(for ø7.94mm-dia connector)
High-pressure outlet port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-dia connector)
Liquid tube service port
(for ø7.94mm-dia connector)