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When the flare nut is tightened properly by your hand,
hold the body side coupling with a separate spanner,
then tighten with a torque wrench (Fig. 21).
Fig. 21
Body side
Hold the torque wrench at its grip, keeping
it in the right angle with the pipe as shown
in Fig. 21, in order to tighten the flare nut
correctly.
Table 4 : Flare nut tightening torque
Pipe
Small pipe (9.53 mm dia)
L arge pipe (15.88 mm dia)
Large pipe (19.05 mm dia)
4. CONNECTING AN INDOOR CAPILLARY TUBE
These instructions refer to the 30,000 and 36,000
BTU/h versions.
Installation Procedure
(1) Braze each part (connection pipe, indoor capillary
tube, and branch liquid pipe) as shown in Fig. 22.
(2) Wrap the two BR sheets around the indoor capillary
tube as shown in Fig. 23.
(3) Cover the indoor capillary tube and the branch liq-
uid pipe with insulation (Fig. 24) and affix the insula-
tion with tape.
(4) Secure the insulation using the binders (Fig. 25).
• If the joint pipe must be installed, refer to the instal-
lation installation manual for the outdoor unit for
details.
Fig. 22
Brazing (all around)
Indoor unit
side
Connection
pipe
Indoor capillary
tube
Branch liquid pipe
Outdoor unit side
yy yy
Holding wrench
90°
Torque wrench
Tightening torque
310 to 350 kgf • cm
(30.4 to 34.3 N • m)
750 to 800 kgf • cm
(73.5 to 78.4 N • m)
800 to 1,000 kgf • cm
(78.4 to 98 N • m)
Indoor unit
side
Connection
pipe
Indoor capil-
lary tube
Fig. 23
Connection pipe
Fig. 24
Tape
Fig. 25
4. INSTALLING THE COUPLER HEAT INSULATION
After checking for gas leaks, insulate by wrapping
insulation around the two parts (large and small) of
the indoor unit coupling, using the coupler heat insu-
lation.
After installing the coupler heat insulation, wrap both
ends with vinyl tape so that there is no gap.
Secure both ends of the heat insulation material using
nylon fasteners.
Fig. 26
Coupler heat insulation (large)
Indoor unit
Indoor unit
• When using an auxiliary pipe, make sure that the
fastener used is insulated in the same way.
– 7 –
BR sheet
Indoor
capillary tube
Branch liquid pipe
Binder
Connection pipe
(large)
Connection pipe
(small)
Coupler heat insulation
(small)
Nylon fastener (large)
Nylon fastener (small)
Tape
No gap
Coupler heat
insulation
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