12
4.3.3 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 raiser pipe, and insulate them.
2)
Connect the drain hose to the drain outlet on the indoor unit, and tighten it with the clamp.
500m
m
Drain raising
hose
220mm
Ceiling
Clamp(attachment
)
Hoisting stand
Roof
Drain hose
1000-1500mm
280mm
(attachment
)
300mm
Fig.13
(2)
Make sure the raiser piping is at most 280mm.
(3)
Stand the raiser piping horizontally, and make sure it is not further than 300mm 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 1000 - 1500mm.
×
(wrong)
(Correct) 1/100 or more gradient
1000-1500mm
Fig.14
(5)
The incline of attached drain hose should be 75mm or less so that the drain outlet does not
have to withstand additional force.
below 500m
m
.
below 75m
m
Drain hose(attachment)
Fig.15
