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Install of the Cassette type indoor unit
● Connect the refrigerant pipe
☆ 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.3.
☆ 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 form 1 to check if the wrench had been tightened (too tight would mangle the nut and lead leakage).
☆ Examine the connection pipe to see if it had gas leakage, then take the treatment of heat insulation, as shown in the
fig.3.
☆ Only use median sponge to entwine the wiring interface of the gas pipe and heat preservation sheath of the gas
collection tube.
Flare nut
Diameter（Inch）
● 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.
Smear freeze motoroil
here
Torque wrench
Spanner
Wiring interface
Form 1: The tightening torque needed for tightening nut
Surface thickness（mm）
φ1/4''
φ3/8''
φ1/2''
φ5/8''
φ3/4''
Median sponge (attachment)
(entwine the wiring interface
with seal mat)
Thread fasten(x4)
Gas collection tube
Liquid inlet tube
Fig.3
Tightening torque (N.m)
≥0.5
≥0.71
≥1
≥1
≥1
7
Heat preservation
sheath of liquid inlet
tube (attachment) (for
liquid tube)
Heat preservation
sheath of gas collection
tube (attachment)(for
gas tube)
15-30 (N·m)
30-40 (N·m)
45-50 (N·m)
60-65 (N·m)
70-75 (N·m)
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