Multi VRF Indoor
Unit Service Manual
71
When unifying multiple drain pipes, install the pipes as shown below. Select converging drain pipes whose
gauge is suitable for the operating capacity of the unit.(
take the cassette type unit for example
)
100 mm
1
0~675 mm
1
Fig.9
①：
T-joint converging drain pipes
it.
4�3 Precautions when doing riser piping work
Make sure that heat insulation work is executed on the following 2 spots to prevent any possible water
leakage due to dew condensation.
a) Connect the drain hose to the drain raiser pipe, and insulate them.
b) Connect the drain hose to the drain outlet on the indoor unit, and tighten it with the clamp.
cassette type duct type
below
500mm
Within 300mm
Drain raising
hose
220mm
Ceiling
Clamp(attachment)
Hoisting stand
Roof
Drain hose
1-1.5m
below
280mm
(attachment)
1000mm
300mm
Drain raising
hose
150mm
Clamp(attachment)
Hoisting stand
Ceiling
Drain hose
1-1.5m
850mm
(attachment)
Make sure the raiser piping is at most 280 mm for cassette type.
Make sure the raiser piping is at most 850 mm for duct type.
Stand the raiser piping horizontally, and make sure it is not further than 300 mm from the base of the drain
outlet.
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.(
take the cassette type unit for example
)
×
(wrong)
(Correct) 1/100 or more gradient
1-1.5m
The incline of attached drain hose should be 75 mm or less so that the drain outlet does not have to
withstand additional force.(
take the cassette type unit for example
)
below 500mm
.
below 75mm
Drain hose(attachment)
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