Panasonic U-8ME1E8E Service Manual page 76

4. Recovering Refrigerant
(2) If the remote controller (CZ-RTC2) is not available for maintenance of the outdoor unit
1 Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (Blue) on the outdoor unit
control PCB is set to No. 1.
2 Short-circuit the test-run pin (CN048) on the PCB to start test run operation.
3 Leave the unit running for a while, and touch the gas tubing with fingers to determine whether the unit is
running in cooling or heating mode.
If it is in heating, follow the step and later procedures.
Cooling : low temperature (20℃ or lower)
Heating: high temperature (60℃ or higher)
CAUTION
4 Release the short-circuit at the test-run pin (CN048) on the outdoor unit control PCB of the No. 1 unit. Then
short-circuit the stop pin (CN053) to stop operation.
5 Short-circuit the COOL pin (CN085) on the outdoor unit control PCB of the No. 1 unit.
6 Short-circuit the test-run pin (CN048) 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 instruc-tions
given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instruc-tions 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.
CAUTION
(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.
NOTE
To determine completion of refrigerant
recovery, follow the instructions that
came with the refrigerant recovery unit.
The gas tubing becomes hot (60℃ or higher) in heating mode. Be careful so as
not to be burnt when touching the tubing.
Remaining refrigerant may create internal pressure, therefore care should be
taken when connecting the hoses.
Refrigerant recovery cylinder
Ball valve (separately purchased)
Gas tube
Outdoor
unit
side
Liquid tube
Outdoor Unit Repair Procedures
Manifold
gauge
Lo
Refrigerant
recovery
unit
Service port
Fig. 4
3 - 11
2WAY SYSTEM
Hi
Indoor unit
3