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Refrigerant Piping
R32 refrigerant
CAUTION
• Incomplete flaring may cause refrigerant gas leakage.
• Do not re-use flares. Use new flares to prevent refrigerant gas leakage.
• Use flare nuts that are included with the unit. Using different flare nuts may cause refrigerant gas leakage.
Use the following item for the refrigerant piping.
Material : Seamless phosphorous deoxidized copper pipe.
ø6.35, ø9.52, ø12.7 Wall thickness 0.8 mm or more
ø15.88 Wall thickness 1.0 mm or more
REQUIREMENT
When the refrigerant pipe is long, provide support brackets at intervals of 2.5 to 3 m to clamp the refrigerant pipe.
Otherwise, abnormal sound may be generated.
Bender Bending pipes Conventional tools (R410A)
Refrigerant recovery equipment Refrigerant recovery Conventional tools (R32 or R410A)
Torque wrench Tightening flare nuts Conventional tools (R410A)
Pipe cutter Cutting pipes Conventional tools (R410A)
Refrigerant cylinder Charging refrigerant
Prepared newly (Use for R32 only)
Welding machine and nitrogen
cylinder
Welding pipes Conventional tools (R410A)
Electronic refrigerant charging
scale
Charging refrigerant Conventional tools (R32 or R410A)
4 INSTALLATION CONDITIONS
Before Installation
Be sure to prepare to the following items before installation.
Length of refrigerant pipe
* Caution during addition of refrigerant
Charge the refrigerant accurately. Overcharging may cause serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than 3m.
This may cause a malfunction of the compressor or other devices.
Airtight Test
1. Before starting an airtight test, further tighten the spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from the service port to the design pressure (4.15 MPa) to conduct
an airtight test.
3. After the airtight test is completed, evacuate the nitrogen gas.
Air purge
• To purge air, use a vacuum pump.
• Do not use refrigerant charged in the outdoor unit to purge air. (The air purge refrigerant is not contained in the
outdoor unit.)
Electrical wiring
• Be sure to fix the power wires and indoor/outdoor connecting wires with clamps so that they do not come into
contact with the cabinet, etc.
Model
Length of refrigerant
pipe connected to
indoor/outdoor unit
Height difference
(Indoor-outdoor)
Item
Indoor unit:
Upper
Outdoor unit:
Lower
GP80 3 to 50 m 30 m 30 m Addition of refrigerant at the local site
is unnecessary for refrigerant pipe
lengths up to 30 m. If the refrigerant
pipe length exceeds 30 m, add
refrigerant in the amount given in
“Charging additional refrigerant”.
GP110
GP140
3 to 75 m 30 m 30 m
EN-149 EN-150
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