Multi Variable Air Conditioners Console Type Indoor Unit
9
WARNING!
①
Do not use mineral oil on flared part.
②
Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
③
Never use piping which had been used for previous installations. Only use parts which are
delivered with the unit.
④
Do never install a drier to this R410A unit in order to guarantee its lifetime.
⑤
The drying material may dissolve and damage the system.
⑥
Incomplete flaring may cause refrigerant gas leakage.
Connecting the refrigerant pipe:
(1) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and
gas leaks.
(2) Align the centers of both flares and tighten the flares and tighten the flare nuts 3 or 4 turns by
hand. Then tighten them fully with the torque wrenches.
(3) To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces in the flare
(Use refrigeration oil for R410A).
Flarenut tightening torque
Gas side
Liquid side
22/28 class
36/45/50 class
22/28/36/45/50 class
3/8 inch
1/2 inch
1/4 inch
32.7-39.9 N.m
(333-407kfg.cm)
49.5-60.3 N.m
(505-615kfg.cm)
14.2-17.2 N.m
(144-175kfg.cm)
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).
Selection of copper and heat insulation materials.
Summary of Contents for GMV-ND22C/A-T
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