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DC Inverter Cassette Type Air Conditioner Installation and Operation Manual
● When connect the pipe to the unit or backout it from the unit, please do use both spanner and torque
wrench. As shown in Fig.22.
● When connect, smear both inside and outside of the flare nut with freeze motor oil, screw it by hand and
then tighten it with spanner.
● Refer to Table 4 to check if the wrench had been tightened (too tight would mangle the nut and lead
leakage).
Diameter(Inch)
φ1/4
φ3/8
φ1/2
φ5/8
φ3/4
● Examine the connection pipe to see if it had gas leakage, and then take the treatment of heat insulation, as
shown in the Fig.22.
● Only use median sponge to entwine the wiring interface of the gas pipe and heat preservation sheath of
the gas collection tube.
8.2.7 Drainage hose
1.Install the drain hose
● The diameter of the drain hose should be equal or bigger than the connection pipe's. (The diameter of
polythene pipe: Outer diameter 25mm Surface thickness ≥1.5mm)
● Drain hose should be short and drooping gradient should at less 1/100 to prevent the formation of air
bubble.
● If drain hose cannot has enough drooping gradient, drain raising pipe should be added.
● To prevent bent of the drain hose, the distance between hoisting stand should is 1 to 1.5m.
Table 4 the tightening torque needed for tightening nut
Surface thickness(mm)
≥0.5
≥0.71
≥1
≥1
≥1
Fig.22
44
Tightening torque (N·m)
15-30
30-40
45-50
60-65
70-75
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