Cassette Type Air Conditioner Unit
23
3-way connection of
drainage pipe joint
Connection of drain elbow
Connection of horizontal pipe
Fig. 4.25 Fig. 4.26 Fig. 4.27
4.5.3 Precautions When Doing Riser Piping Work
(1).
Make sure that heat insulation work is executed on the following 2 spots to
prevent any possible water leakage due to dew condensation.
1).
Connect the drain hose to the drain lift pipe, and insulate them.
2).
Connect the drain hose to the drain outlet on the indoor unit, and tighten it with
the clamp.
Drain lift pipe
≤1
00
0m
m(
39
-3
/8
in
ch
)
≤300mm(11-3/4inch)
1000~1500mm(39-3/8~59inch)
Drain hose (attachment)
Ceiling
Clamp (attachment)
Hoisting stand
Roof
Fig. 4.28
(2).
Make sure the lift pipe is at most 280 mm.
(3).
Stand the lift pipe vertically, and make sure it is not further than 300 mm from the
base of the drain outlet.
(4).
Secure a downward gradient of 1/100 or more for the drain pipe. To accomplish
this, mount supporting brackets at an interval of 1 - 1.5 m.
