Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 72

3. Recovering Refrigerant
(2) If the remote controller is not available for maintenance of the outdoor unit
1 Short-circuit the MODE pin ("COOL" side) on the outdoor unit control PCB.
2 Short-circuit the CHK pin on the PCB to start test run operation.
3-2-2. 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. 3, follow the instructions
given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in
"3-2-3. Refrigerant recovery procedures (2)."
(2) After running the unit in Cooling mode for about 5 minutes as described in "3-2-1. 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. 3) Do each connection quickly to prevent air from entering the tubing.
CAUTION
(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.
3
NOTE
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.
Refrigerant
recovery unit
Refrigerant
Ball valve
recovery cylinder
(field supply)
Gas tube
Service port
Outdoor unit
Liquid tube
Manifold
gauge
Hi Lo
Indoor unit
Fig. 3
3 - 6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures