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6. REFRIGERANT PIPING WORK
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For the outdoor unit refrigerant piping, refer to the installation manual attached to the outdoor unit.
•
Carry out insulation of both gas and liquid refrigerant piping securely. If not insulated, it may cause water
leakage. For gas piping, use insulation material of which heat resistant temperature is not less than 120°C.
For use under high humidity, strengthen the insulation material for refrigerant piping. If not strengthened,
the surface of insulation material may sweat.
•
Before installation work, make sure that the refrigerant is used according outdoor unit specification. (Unless
correct refrigerant, the normal operation...)
CAUTION
This air conditioner is a dedicated model for refrigerant R410A or R32. Make sure to meet the requirements
shown below and carry out installation work.
•
Use dedicated piping cutters and flaring tools according to the refrigerant used.
•
When making a flare connection, coat the flared inner surface only with either oil or ester oil.
•
Use only the flare nuts attached to the air conditioner. If other flare nuts are used, it may cause refrigerant
leakage.
•
To prevent contamination or moisture from getting into the piping, take measures such as pinching or tap-
ing the piping.
Do not mix substance other than the specified refrigerant such as air into the refrigeration circuit.
If the refrigerant leaks during the work, ventilate the room.
Refrigerant piping can be connected from 3 directions.
•
In case of upward piping, remove the piping penetration cover, make holes for penetrating piping by cut-
ting the cover with a cutter such as scissors.
After having the piping go through the cover, attach the cover to the indoor unit.
(Refer to Fig. 19)
•
The refrigerant is pre-charged in the outdoor unit.
•
Use the flare nut attached to the air conditioner.
•
When making a flare connection, coat the flared inner surface only with either oil or ester oil.
(Refer to Fig. 20)
Then, turn the flare nut 3 to 4 times with your hand and screw in the nut.
CAUTION
Do not have oil adhere to the screw fixing part of resin parts.
If oil adheres, it may weaken the strength of screwed part.
Electric wiring
Piping penetration cover
Drain
Gas
Liquid
Fig.19
Coat the flare inner surface
only with ether oil or ester oil.
Fig. 20
4PEN469441-1.book Page 13 Tuesday, March 21, 2017 1:49 PM