Flex Match
5
2.6 Connection of the Refrigerant Pipe
◆
When connecting the pipe to the unit use a wrench and torque wrench as shown in Fig. 5.
◆
Spread refrigerant oil lubricant to inside and outside of flare nut. Begin turning flare nut by
hand, then tighten with a wrench.
◆
Refer to Table 1 to check for required torque (Note: over-tightening can cause damage to the
nut or pipe and cause refrigerant leakage).
◆
Examine the connection pipe for leaks. Apply heat insulation, as shown in the Fig. 5.
◆
Wrap tubes and heat preservation sheath with PTFE tape as shown
Smear freeze motoroil
here
Spanner
Thread fasten(X4
)
Median sponge (attachment)
(entwine the wiring interface
with seal mat)
Gas collection tube
Liquid inlet tube
Heat preservation
sheath of liquid inlet
tube (attachment) (for
liquid tube
)
Heat preservation
sheath of gas collection
tube (attachment)(for
gas tube
)
Flare nut
Wiring interfac
e
Torque wrench
Fig. 5
Table 1: The moment of torque for tightening nut
Diameter
（
Inch
）
Surface thickness
（
mm
）
Moment of torque (N
·
m)
φ1/4’’
≥
0.5
15-30 (N
·
m)
φ3/8’’
≥
0.71
30-40 (N
·
m)
φ1/2’’
≥
1
45-50 (N
·
·m)
φ5/8’’
≥
1
60-65 (N
·
m)
φ3/4’’
≥
1
70-75 (N
·
·m)
If the diameter of the outdoor unit pipe joint does not match the indoor unit, the joint
specification of the outlet pipe of the indoor unit takes precedence. A reducing nipple should be
installed at the joint of the outdoor unit to make the joint of the outdoor unit compatible with the
indoor unit.
2.7 Drain Hose
(1). Install the drain hose
◆
The diameter of the drain hose should be larger than or equal to the connection pipe
diameter. (The diameter of polythene pipe: Outer diameter 25mm (1 in) Surface thickness
≥
1.5mm)
