En-4
gauge reading reaches 0.1-0.2 MPa, retighten the valve stem and disconnect the
charge hose from the 3-way valve charging port.
(If the stem of the 3-way valve is opened fully before the charge hose is disconnect-
ed, it may be dif
¿
cult to disconnect the charge hose.)
(10) Fully open the valve stems of the 2-way valve and 3-way valve using a hexagon
wrench. (After the valve stem begins to turn, turn it with a torque of less than
2.9 N • m (30 kgf • cm) until it stops turning.)
(11) Firmly tighten the 2-way valve and 3-way valve blank cap and the charging port cap.
3-way valve
2
-way valve
Charging
port cap
Vacuum pump
Charge
hose
Charge hose
Charging
port
Blank cap
Valve stem
Flare nut
Compound pressure gauge
Gauge manifold
Pressure gauge
High
pressure
side valve
(closed)
Low
pressure
side
valve
-0.1 MPa
(-76 cmHg
-1 bar)
Tightening torque
Blank cap
20.0 to 25.0 N • m (200 to 250 kgf • cm)
Charging port cap
12.5 to 16.0 N • m (125 to 160 kgf • cm)
5.5. Test run
• Perform test operation and check items below.
• For the test operation method, refer to the operating manual.
• The outdoor unit, may not operate, depending on the room temperature. In this case,
keep on pressing the MANUAL AUTO button of the indoor unit for more than 10 seconds.
The operation indicator lamp and timer indicator lamp will begin to
À
ash simultaneously
during cooling test run. Then, heating test run will begin in about three minutes when
HEAT is selected by the remote control operation. (Please follow the operating manual
for remote control operation.)
• To end test operation, keep on pressing the MANUAL AUTO button of the indoor unit for
more than 3 seconds.
(When the air conditioner is run by pressing the test run button, the OPERATION indica-
tor lamp and TIMER indicator lamp of the indoor unit will simultaneously
À
ash slowly.)
OUTDOOR UNIT
(1)
Is there any abnormal noise and vibration during operation?
(2)
Will noise, wind, or drain water from the unit disturb the neighbors?
(3) Is there any gas leakage?
6. PUMP DOWN
6.1. Pump down
PUMP DOWN OPERATION (FORCED COOLING OPERATION)
To avoid discharging refrigerant into the atmosphere at the time of relocation or disposal,
recover refrigerant by doing the cooling operation or forced cooling operation according
to the following procedure. (When the cooling operation cannot start in winter, and so on,
start the forced cooling operation.).
(1)
Do the air purging of the charge hose by connecting the charging hose of gauge mani-
fold to the charging port of 3 way valve and opening the low-pressure valve slightly.
(2) Close the valve stem of 2 way valve completely.
(3)
Start the cooling operation or following forced cooling operation. Keep on pressing the
MANUAL AUTO button of the indoor unit for more than 10 seconds. The operation in-
dicator lamp and timer indicator lamp will begin to flash simultaneously during test run.
(The forced cooling operation cannot start if the MANUAL AUTO button is not kept on
pressing for more than 10 seconds.)
(4)
Close the valve stem of 3 way valve when the reading on the compound pressure
gage becomes 0.05~0 Mpa(0.5~0 kg/cm2).
(5)
Stop the operation.
• Press the START/STOP button of the remote control unit to stop the operation.
• Press the MANUAL AUTO button when stopping the operation from indoor unit side. (It
is not necessary to press on keeping for more than 10 seconds.)
CAUTION
During the pump-down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2 way or 3
way valve open. This may cause abnormal pressure in the refrigeration cycle that leads
to breakage and even injury.
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