11 ■English
Refrigerant Piping Work
2-1.
Caution on piping handling.
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe bender
for bending.
(Bending radius should be 30 to 40mm or larger.)
2-2.
Selection of copper and heat insulation materials.
• When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045 kcal/(mh•°C))
Refrigerant gas pipe’s surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimen-
sions as below.
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Pump Down Operation
In order to protect the environment, be sure to pump down when relocating or disposing of the unit.
1) Remove the valve cap from liquid stop valve and gas stop valve.
2) Carry out forced cooling operation.
3) After five to ten minutes, close the liquid stop valve with a hexagonal wrench.
4) After two to three minutes, close the gas stop valve and stop forced cooling operation.
How to force cooling operation mode
■ Using the indoor unit operation/stop button
Press the indoor unit operation/stop button for at least five seconds.
(Operation will start.)
• Forced cooling operation will stop automatically after around 15 minutes.
To force a test run to stop, press the indoor unit operation/stop button.
■ Using the main unit’s remote controller
1) Press the “operation/stop” button.
(Operation will start.)
2) Press the temperature
button and the “operation select” button at the same time.
3) Press the “operation select” button twice.
(
will be displayed and the unit will enter test run mode.)
4) Press the “operation select” button to return the operation mode to cooling.
• Test run mode will stop automatically after around 30 minutes. To force a test run to stop, press the operation/stop button.
CAUTION
1) After closing the liquid stop valve, close the gas stop valve within three minutes, then stop the forced operation.
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe
thermal
insulation
20/25/35/42
class
50 class
20/25/35/42
class
50 class
O.D. 9.5mm O.D. 12.7mm O.D. 6.4mm I.D. 12-15mm I.D. 14-16mm I.D. 8-10mm
Thickness 0.8mm Thickness 10mm Min.
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
Gas
stop valve
Valve cap
Hexagonal
wrench
Close
Liquid
stop valve
01_EN_3P207052-1.fm Page 11 Wednesday, September 19, 2007 4:46 PM
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