User manual

19English
Installation Procedure
Step 7 Installing oil traps
Check the following list and install an oil trap.
• Based on cooling operation, install it on the gas side
pipe only.
• Install the oil trap only in between the outdoor unit
and the first branch joint and it should be installed at
every 10 m.
• Radius of curvature (R) on the oil trap are as follows;
Pipe
diameter
(D, mm)
12.70 15.88 19.05 22.23 25.40 28.60 31.75
Radius of
curvature
(R, mm)
25 and
over
32 and
over
38 and
over
41 and
over
51 and
over
57 and
over
60 and
over
• Height of the oil trap (H): 4R ≤ H ≤ 6R
• When the indoor unit is installed at a higher place
than the outdoor unit
H
R
Outdoor Unit
Indoor Unit
Oil trap (Install it
at every 10 m)
Step 8 Connecting up and removing air
in the circuit
CAUTION
• When installing, make sure there is no leakage. When
recovering the refrigerant, ground the compressor
first before removing the connection pipe. If the
refrigerant pipe is not properly connected and the
compressor works with the service valve open, the
pipe inhales the air and it makes the pressure inside
of the refrigerant cycle abnormally high. It may cause
explosion and injury.
The air in the indoor unit and in the pipe must be
evacuated. If air remains in the refrigerant pipes, it will
affect the compressor either reduce cooling/heating
capacity or lead to a malfunction. Refrigerant for air
purging is not charged in the outdoor unit. Use Vacuum
Pump as shown at the right figure.
1 Connect each assembly pipe to the appropriate valve
on the outdoor unit and tighten the flare nut.
2 Referring to the illustration below, tighten the flare
nut on section D first manually and then with a
torque wrench, applying the following torque.
Outdoor Unit
A (Gas)
B (Liquid)
D
C
Outer Diameter (mm)
Torque (N⋅m)
ø6.35 14 to 18
ø9.52 34 to 42
ø12.70 49 to 61
ø15.88 68 to 82
ø19.05 100 to 120