11
DRAIN PIPING WORK
Drain Piping Installation
Install the drain piping as shown in Fig. 14 and take steps to
eliminate condensation. Improperly rigged piping could lead to
leaks and eventually wet furniture and belongings.
Fig. 14
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Drain Piping Installation
Fig. 15
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Hanging Bar
(1.) Hanging bar
(2.)
1/100 gradient
Install the Drain Pipes
S
Keep piping as short as possible and slope it downwards
at a gradient of at least 1/100 so that air does not remain
trapped inside the pipe.
S
Keep the pipe size equal to or greater than that of the
connecting pipe (PVC pipe, nominal diameter 0.79 in.
(20mm)), outside diameter 0.98 in. (25mm).
S
Push the drain hose as far as possible over the drain
socket, and tighten the metal clamp securely.
Fig. 16
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Push the Drain Hose
7. Remove the paper pattern for installation (for new ceilings
only).
(1.) Drain socket (attached to the unit)
(2.) Metal clamp
(3.) Drain hose
(4.) Insulation (field supply)
a. Insulate the drain hose inside the building.
b. If the drain hose cannot be sufficiently set on a slope, fit
the hose with the drain raising piping (field supplied).
c. Ensure the heat insulation work is executed on the
following two spots to prevent any possible water
leakage due to dew condensation:
(1.) Indoor drain pipe
(2.) Drain socket.
DRAINAGE HOSE
IMPORTANT
: Observe all local sanitary codes when installing
condensate drains.
1. Install the drain hose.
S
The drain hose diameter should be equal or larger than the
connection pipe’s. The diameter of the polythene pipe:
Outer diameter 1 in. (25 mm) Surface thickness
0.06 in.
(1.5 mm).
S
The drain hose should be short and the drooping gradient
should be less than 1/100 to prevent the formation of an
air bubble. If the drain hose does not has enough of a
drooping gradient, a drain raising pipe should be added.
S
To prevent a bend in the drain hose, the distance between
the hoisting stand should be 3 to 5 ft. (1 to 1.5 m) (see
Fig. 17).
Fig. 17
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Drain Hose
S
Use the drain hose and clamp attached. Insert the drain
hose into the drain vent, and then tighten the clamp.
S
Entwine the big sponge on the drain hose clamp to
insulate heat.
S
Heat insulation should be applied to the indoor drain
hose.
Sponge(attachment)
Clamp(attachment)
Below
1/6 in (4 mm)
Clamp
Drain hose
Sponge (gray)
Fig. 18
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Drain Hose
NOTE
: Drain Setup pipe
S
The install height of the drain raising pipe should be less
than 21 in. (530 mm).
S
The drain raising pipe should form a right angle with the
unit, and the distance to the unit should not exceed 11.81
in. (300 mm).
