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4. Installing the refrigerant piping
g
c
b
a
d
f
h
j
k
i
l
n
o
a Indoor unit (main unit)
b *1 Pipe cover
c *2 Band
d Flare joint
e Joint positions
f Auxiliary pipe cover (procure locally)
g Tighten the band and use tape to secure
the joint in position temporarily.
Fig. 4-3
. Drainage piping work
Fig. -1
p
e
q
c
r
m
h Position the pipe cover so that the end is
in firm contact with the main unit. Fasten
it so that there is no clearance.
i Indoor unit
j Flared connection
k Flexible tube
l Refrigerant pipes
m Outdoor unit
n Gas
o Liquid
Fig. 4-
1) Peel the separator sheet off the accompanying pipe cover, and wrap it around the
refrigerant pipe, making sure that the side which is slit faces upwards. (Fig. 4-2)
p Allow no clearance
q Separator sheet
2) Be sure to fix both ends of the pipe cover using an attachment band (ensure
that the band's joint faces upwards).
r Cut off the remainder band
3) Stick vinyl tape on the joint positions.
See that stop valve on outdoor unit is fully shut (unit is shipped with valve shut).
After all piping connections between indoor and outdoor unit have been completed.
Test for gas leaks between the indoor unit and the preexisting tubes by running ni-
trogen through the stop valve's service port on the outdoor unit.
Vacuum-purge air from system through the service port for the stop valve on the
outdoor unit.
After completing procedures above, open outdoor unit stop valves stem fully. This
completes connection of refrigerant circuit between indoor and outdoor units.
If the stop valves are left closed and the unit is operated, the compressor will be
damaged.
Stop valve instructions are marked on outdoor unit.
1) Specified tightening torques (use a torque wrench) (Fig. 4-3)
Torque specifications
Outer dia. of copper tube (mm)
ø9.52
ø15.88
ø19.05
• If a torque wrench is not available, the following method may be used.
While tightening the flare nut with a spanner, stop turning the nut at the point
where the tightening torque suddenly increases. Then, turn the spanner in the
angle specified in the table below.
Approximate additional tightening angle
Pipe diameter
ø6.35, ø9.52
ø15.88, ø19.05
.1. Drainage piping work (Fig. -1)
Indoor unit's drainage pipe
• The drainage pipe should be arranged so that the discharge end is lower than
the other end, as shown in the fig. 5-1.
• Place the trap outside the unit.
• After connecting the drainage pipe, make sure that water is discharged properly
and that there are no leaks.
Outdoor unit drainage pipe connection
When drainage piping is necessary, use the drain pan (supplied as an option).
A Drainage piping connection 1 BSP male B Trap C Indoor unit
Tightening torque (kg/cm)
350 - 420
750 - 800
1000 - 1400
Tightening angle
60° - 90°
30° - 60°
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