Panasonic WH-ADC0309H3E Service Manual page 65

11.1.9.2 Maintenance for Safety Relief
Valve

It is strongly recommended to operate the valve
by turn the knob counter clockwise to ensure free
water flow through discharge pipe at regular
intervals to ensure it is not blocked and to remove
lime deposit.
11.1.9.3 Proper Pump Down Procedure
Strictly follow the steps below for proper pump down procedure.
Explosion may occur if the steps are not followed as per
sequence.
1. When the Tank Unit is not in operation (standby), press the
"SERVICE" switch on the Remote Controller to enter
SERVICE mode. Operate the system in Sr : 01 mode for
pump down operation.
2. After 10~15 minutes, (after 1 or 2 minutes in case very low
ambient temperatures (< 10°C)), fully close 2 way valve on
Outdoor Unit.
3. After 3 minutes, fully close 3 way valve on Outdoor Unit.
4. Press the "OFF/ON" switch on the Remote Controller to
stop pump down operation.
5. Remove the refrigerant piping.
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