Installation Manual

4 CONNECTING THE DRAIN PIPE
4.1 Installation of drain piping
Install the drain piping as shown in the figure below and take
measures against condensation. Improperly rigged piping could lead
to leaks and, eventually, wet furniture and belongings.
- Keep the piping as short as possible and slope it downward at
a gradient of at least 1/100 so that air cannot stay trapped
inside the pipe.
- Keep the pipe size equal to or greater than that of the
connecting pipe (PVC pipe, nominal diameter 20 mm/0.8 in,
outside diameter 25 mm/1 in).
- Push the drain hose as far as possible over the drain socket
and tighten the metal clamp securely.
- Connect the drain hose to the drain raising pipes and insulate
them.
- Connect the drain hose to the drain outlet on the indoor unit
and tighten it with the clamp.
4.3 How to perform piping
Precautions
Install the drain raising pipes at a height of less than 530 mm
(20.9 in).
Install the drain raising pipes at a right angle to the indoor
unit and no more than 300 mm (11.8 in) from the unit.
To prevent air bubbles, install the drain hose levelly or slightly
tilted up (< 7 5 mm/3 in).
The incline of the drain hose should be 75 mm (3 in) or less so
the drain socket does not have to withstand unnecessary force.
To ensure a downward slope of 1:100, install hanging
bars every 1 m (3.3 ft) to 1.5 m (4.9 ft).
When unifying multiple drain pipes, install the pipes as
shown in the figure below. Select converging drain pipes whose
gauge is suitable for the operating capacity of the unit.
1 Ceiling slab
2 Hanger bracket
3 Adjustable range
4 Drain raising pipe
5 Drain hose
6 Metal clamp
1 T-joint converging drain pipes
12
1 Hanging bar
2 ≥1/100 gradient
1
2
3
4
Drain socket (attached to the unit)
Metal clamp
Drain hose
Insulation (field supply)
- Insulate the drain hose inside the building.
- If the drain hose cannot be sufficiently set on a slope, fit the
hose with drain raising piping (field supply).
- Make sure that heat insulation work is executed on the
following 2 spots to prevent any possible water leakage due
to dew condensation:
1 Indoor drain pipe
2 Drain socket
1 2
3 4
0-530
100
1
1
1-1.5 m
1
2
√
×
4.2 Install the drain pipes
Drain piping connections
Do not connect the drain piping directly to sewage
pipes that smell of ammonia. The ammonia in the
sewage might enter the indoor unit through the drain
pipes and corrode the heat exchanger.
Keep in mind that water collecting on the drain pipe
will block the drain pipe.
Unit: mm
Unit: mm
3-5 ft
1
2
0~75
5
1-1.5 m
≤300/11.8in
6
5
4
3
220/8.7in
≤750/29.5in
0~3 in
≤530/20.9in
3-5 ft