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English
Outdoor Unit Installation
3-1 Cautions on pipe 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.
3-2 Selection of copper and heat insulation materials
• Installation shall be done by an installer, the choice of materi-
als and installation shall comply with the applicable legislation.
In Europe the EN378 is the applicable standard that shall be used.
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 0.045kcal/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
dimensions as below.
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
4) Piping and other pressure containing parts shall comply with the applicable legislation and shall be suitable for refrig-
erant. Use phosphoric acid deoxidised seamless copper for refrigerant.
4.
Evacuating the air with a vacuum pump and checking gas leakage
WARNING
• Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
• When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
• R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.
• Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
• Use tools for R32 (such as the gauge manifold, charging hose, or vacuum pump adapter).
• When piping work is completed, it is necessary to evacuate the air and check for gas
leakage.
• If using additional refrigerant, perform air evacuating from the refrigerant pipes
and indoor unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench (4mm) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench at the specified
tightening torque.
Gas side
Liquid side
Gas pipe
thermal insulation
Liquid pipe
thermal insulation
O.D. 9.5mm
O.D. 6.4mm
I.D. 12-15mm
I.D. 8-10mm
Minimum bend radius
Thickness 10mm Min.
30mm or more
Thickness 0.8mm (C1220T-O)
Wall
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Be sure to
place a cap.
Rain
Gas pipe
Inter-unit wire
Liquid pipe
Drain hose
Finishing tape
Gas pipe
insulation
Liquid pipe
insulation
Compound
pressure gauge
Pressure
metre
High-
pressure
valve
Low-pressure
valve
Vacuum pump
Service port
Liquid
stop
valve
Valve caps
Gas stop valve
Charging
hoses
Gauge
manifold
3PEN386697-4L.book Page 7 Monday, July 31, 2017 2:37 PM
