DC Inverter Cassette Type Unit
19
3-way connection
of drainage pipe joint
Connection of drain elbow
Connection of horizontal pipe
Fig.27 Fig.28 Fig.29
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.
i
). Connect the drain hose to the drain lift pipe, and insulate them.
ii
). Connect the drain hose to the drain outlet on the indoor unit, and tighten it with the clamp.
Drain lift pipe
Fig.30
(2). Make sure the lift pipe is at most 280mm.
(3). Stand the lift pipe vertically, 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 1 -1.5 m.
×
(wrong)
(Correct) 1/100 or more gradient
1-1.5m
Fig.31
(5). The incline of attached drain hose should be 75mm or less so that the drain outlet does not
have to withstand additional force.
