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5. FINISHING
■ Installing insulation
• Determine the thickness of the insulation material by referring to Table A.
Table A, Selection of insulation
(for using an insulation material with equal heat transmission rate or below
0.040 W/(m·k))
Relative humidity
[mm (in.)]
6.35 (1/4)
9.52 (3/8)
Pipe diameter
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
• If the ambient temperature and relative humidity exceed 32 °C, increase the level of
heat insulation for the refrigerant pipes.
6. 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 forced cooling operation according to the following
procedure.
(1) Conduct preliminary operation for 5 to 10 minutes using the forced cooling operation.
Start the forced cooling operation. Keep on pressing the [MANUAL AUTO] of the
indoor unit for more than 10 seconds. The operation indicator lamp and timer indicator
lamp will begin to fl ash simultaneously during test run. (The forced cooling operation
cannot start if the [MANUAL AUTO] is not kept on pressing for more than 10 seconds.)
(2) Close the valve stem of 2-way valve completely.
(3) Continue the forced cooling operation for 2 to 3 minutes, then close all the valve
stems on the 3-way valves.
(4) Stop the operation.
• Press the [START/STOP] of the remote controller to stop the operation.
• Press the [MANUAL AUTO] when stopping the operation from the indoor unit side.
(It is not necessary to press down for more than 10 seconds.)
Check the refrigerant circuit for any leaks before starting the pump down operation.
Do not proceed with the pump down operation if there is no refrigerant left in the circuit
due to bent or broken piping
During the pump down operation, be sure to turn off the compressor before removing
the refrigerant piping.
En-10
Insulation material
Minimum thickness [mm]
70%
75%
80%
or more
or more
or more
8
10
13
9
11
14
10
12
15
10
12
16
10
13
16
CAUTION
85%
or more
17
18
19
20
21
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