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8
English
5. REFRIGERANT PIPING WORK
〈For refrigerant piping of outdoor unit, see the installa-
tion manual attached to the outdoor unit.〉
〈Execute thermal insulation work completely on both
sides of the gas piping and the liquid piping.
Otherwise, a water leak can occur.〉
(When using a heat pump, the temperature of the gas piping
can reach up to approximately 250°F (120°C), so use insula-
tion which is sufciently resistant.)
〈Also, in cases where the temperature and humidity of
the refrigerant piping sections might exceed 86°F (30°C)
or RH80 %, reinforce thermal insulation (13/16 (20mm) or
thicker) for the refrigerant piping. Condensation may
form on the surface of the insulating material.〉
〈Before refrigerant piping work, check which type of
refrigerant is used. Proper operation is not possible if
the type of refrigerant is not the same.〉
DANGER
• Refrigerant gas may produce toxic gas if it comes in
contact with re such as from a fan, heater, stove or
cooking device. Exposure to this gas could result in severe
injury or death.
NOTE
• Use a pipe cutter and a aring tool suitable for the type of
refrigerant.
• To prevent dust, moisture or other foreign matter from
inltrating the tube, either pinch the end or cover it with
tape.
• Do not allow anything other than the designated refriger-
ant to get mixed into the refrigerant circuit, such as air, etc.
• If refrigerant gas leaks while working on the unit, ventilate
the room thoroughly right away.
• The refrigerant is pre-charged in the outdoor unit.
• Use copper alloy seamless pipes.
• Be sure to use both a spanner and a torque wrench
together, when connecting or disconnecting pipes to/from
the unit. (Refer to Fig. 12)
• Refer to “Table 1” for the dimensions of are.
• When connecting the are nut, coat the ared inner sur-
face only with ester oil or ether oil, rotate three or four
times rst, then screw in.
(Refer to Fig. 13)
Fig. 12
Torque wrench
Spanner
Union joint
Flare nut
Coat the flared inner surface only
with ester oil or ether oil
Fig. 13
CAUTION
• Use the are nut included with the unit.
• Refer to Table 1 for the corresponding tightening torque.
Table 1
Piping
size
[in. (mm)]
Tightening
torque
[lbf·ft. (N·m)]
Dimension for
processing are
A [in. (mm)]
Flare shape
[in. (mm)]
f 3/8
(9.5)
24.1 – 29.4
(36.3±3.6)
0.504 – 0.520
(13.0±0.2)
R0.016-0.031
(0.4-0.8)
A
90˚±2˚
45˚±2˚
f 5/8
(15.9)
45.6 – 55.6
(68.6±6.8)
0.760 – 0.776
(19.5±0.2)
CAUTION
• Do not excessively tighten the are nut.
Doing so will break the are nut and refrigerant leakage
may occur.
• Make sure that all parts around the are are free of oil.
The drain pan and the resin part may be deteriorated if oil
is attached.
CAUTION
• Do not use ux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing lter metal (BCuP) which
does not require ux.
(Flux has an extremely negative effect on refrigerant
piping systems. For instance, if chlorine based ux is
used, it will cause pipe corrosion. If the ux contains
uorine, it will damage the refrigerant oil.)
01_EN_3PN07521-5H.indd 8 7/9/2018 14:13:34
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