Ceiling Cassette Air Handler Installation Manual

6.1 Installation of drain piping
Install the drain piping as shown in gure below
and take measures against condensation.
Use PVC pipe, use of plastic, exible piping is
discouraged.
6.3 How to perform piping
• Connect the drain hose to drain lift pipes, and
insulate them.
• Connect the drain hose to the drain outlet on
the indoor unit, and tighten it with the clamp.
6.2 Install the drain pipes
• Keep piping as short as possible and slope it
downwards at a gradient of at least 1/100 so
that air may not remain trapped inside the
pipe.
• Keep pipe size equal to or greater than that of
the discharge pipe of the unit.
• Push the drain hose as far as possible over
the drain socket, and tighten the metal clamp
securely.
• Insulate the drain hose inside the building.
• If the drain hose cannot be suciently set on
a slope, t the hose with drain lift piping (eld
supply).
• Make sure that heat insulation work is
executed on the Indoor drain pipe and the
drain socket to prevent condensation.
3~5ft
Hanging bar
1/100 gradien
t
Fig 6.1
12
34
1 - Drain socket (attached to the unit)
2 - Metal clamp
3 - Drain hose
4 - Insulation (field supply)
Fig 6.3
5
11.8in
8.7in
29.5in
0~3in
20.9in
3~5ft
Ceiling Slab
Hanger
bracket
Adjustable
range
Drain
raising pipe
Metal
clamp
Drain
hose
 Page 14 
Revised 5/14/2020
6
Connecting The Drain Pipe
Connecting
The Drain Pipe