Heat Insulation - Panasonic WH-ADF0309J3E5CM Service Manual

13.7 Heat Insulation

1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram.
Please wrap the insulated piping end to prevent water from going inside the piping.
2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using
POLY-E FOAM with thickness 6 mm or above.
Use a material with good heat-resistant properties as the heat insulation for the
pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes are
CAUTION
not adequately insulated, condensation or water leakages may occur.
13.7.1 Disposal Of Outdoor Unit Drain Water

If a drain elbow is used, the unit should be placed on a stand which is taller than 5 cm.

If the unit is used in an area where temperature falls below 0 °C for 2 or 3 days in succession, it is recommended
not to use a drain elbow, for the drain water freezes and the fan will not rotate.
13.7.2 Pump Down Operation

Operate the pump down according to the following procedures.
1. Confirm all the 4pcs of 3-way valve on liquid and gas side are open.
2. Connect pressure gauge to gas side of 3-way valve for Duct unit (recommended).
3. Press PUMP DOWN switch (SW1) on the display printed circuit board for more than 5 seconds. Pump down
(cooling) operation is performed for 15 minutes.
4. Set the liquid side 3-way valve for Tank unit to close position followed by liquid side 3-ways valve for Duct
unit and wait until the pressure gauge indicates 0.01 MPa (0.1 kg/cm
5. Immediately set the gas side 3-way valve for Tank unit to close position followed by gas side 3-way valve for
Duct unit and then press the PUMP DOWN switch (SW1) to stop the pump down operation.
Note: Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch (SW1) is not
pressed again.
Pump down operation is not started within 3 minutes after compressor is stopped.
LED 2 3 4 5
○ ○ ○ ○
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: Flashing
Refrigerant tubing shall be protected against mechanical damage.
Message
Pump down operation progress
3 minutes before operation end
2 minutes before operation end
1 minute before operation end
Pump down operation end
2
G).
Gas shut-off valve
Liquid shut-off valve
172
Material shall
Liquid-side pipes
withstand
Gas-side pipes
120 °C or higher
Close
Hexagonal
wrench
Valve lid