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ADDITIONAL REFRIGERANT CHARGE
• Refrigerant may only be charged after performing
the leak test and the vacuum pumping.
• Check the type of refrigerant to be used on the
machine nameplate. Charging with an unsuitable
refrigerant may cause explosions and accidents,
so always ensure that the appropriate refrigerant
is charged.
• Refrigerant containers shall be opened slowly.
• The outdoor unit is factory charged with
refrigerant. Calculate the added refrigerant
according to the diameter and the length of
the liquid pipe of the outdoor unit/indoor unit
connection.
1 Piping insulation material (field supply).
2 Flare nut connection.
3 Insulation for fitting (field supply).
4 Piping insulation material (main unit).
5 Indoor unit.
6 Clamp (field supply).
A Turn seams up.
B Attach to base.
C Tighten the part other than the piping insulation
material.
• Be sure to add the proper amount of additional
refrigerant. Failure to do so may result in reduced
performance.
Pipe length and refrigerant amount:
REFRIGERANT PIPING WORK
• Caution on the pipe handling, protect the open
end of the pipe against dust and moisture. All pipe
bends should be as gentle as possible. Use a pipe
bender for bending.
Connective
pipe length
Less
than 7.5m
/295.3"
More
than 7.5m
/295.3"
Air
purging
method
Use
vacuum
pump.
Use
vacuum
pump.
Additional amount of refrigerant
to be charged
R410A: (Pipe length-7.5(25))
x15g/m(0.16oz/ft)
Liquid side: 6.35mm/.25"
R410A: (Pipe length-7.5(25))
x30g/m(0.32oz/ft)
Liquid side: 9.52mm/.375"
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt or
water out.
Wall
Rain
1 Liquid pipe
2 Gas pipe
3 Insulation for liquid pipe fitting
4 Insulation for gas pipe fitting
5 Clamps
(use 2 clamps per insulation)
6 Indoor unit
1
3
5
2
4
6
Gas piping
Liquid piping
1
1
6
6
6
6
4
4
5
5
3
3
2
2
A
A
C
C
B
B
• Finally, insulate as shown in the figure below.
PIPING INSULATION PROCEDURE
CAUTION
WARNING
• For local insulation, be sure to insulate local
piping all the way into the pipe connections
inside the unit. Exposed piping may cause
condensation or may cause burns when touched.
• Make sure that no oil remains on plastic parts of
the decoration panel (optional equipment). Oil
may cause degradation and damage to plastic parts.
• Be sure to insulate both the gas and liquid piping.
Use separate thermal insulation pipes for gas and
liquid refrigerant pipes. See the figure below.
Inter-unit wire
Liquid pipe
Liquid pipe
insulation
Drain hose
Finishing tape
Gas pipe
insulation
Gas pipe
