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Fig. 3-83
Fig. 3-84
Fig. 3-85
Min. 1-31/32 in.
Inspection plug
Min.
3-15/16 in.
Good
Min. 1/100
Downward gradient
Not good
3-21. Installing the Drain Piping
(1) Prepare standard hard PVC pipe (O.D. 1-1/4") for the
drain and use the supplied drain socket to prevent water
leaks. The PVC pipe must be purchased separately.
When doing this, apply adhesive for the PVC pipe at the
connection point.
(2) If connecting a drain joint (supplied) to the threaded
drain port, first wrap the drain port threads with sealing
tape, then connect the joint. (Fig. 3-83)
(3) After connecting the drain pipe securely, wrap insulator
(field supply) around the pipe.
(4) Ensure the drain pipe has a downward gradient (1/100
or more) and prepare traps as indicated in Fig. 3-84.
(5) Also, in another part of the pipe arrangement, prepare
traps with an inspection plug to clean dust or debris that
may cause leaking of water. (Fig. 3-85)
(6) After connecting the drain piping, slowly pour water into
the drain pan to check that the water drains smoothly.
3-22. Caution for Ducting Work
● This unit has high static pressure (applicable external static
pressure Max. 24.2
××
10
-3
to 31.3
××
10
-3
psi (0.68 – 0.88
in.Aq). In the case of small pressure resistance (for
instance, a short duct), install a damper for adjusting air
flow volume as air flow volume / air flow noise increases.
● If the air conditioner is to be installed in a room such as
an office or meeting room which needs a low sound
level, provide a supply and return noise absorption
chamber with an acoustic liner.
● Include an air filter (field supply) at the return duct.
3-23. Indoor Fan Performance
How to Read the Diagram
The vertical axis is the External Static Pressure
(psi, in.Aq) while the horizontal axis represents
the Air Flow (ft.
3
/minute). The characteristic
curve for the “H,” “Med,” and “Lo” fan speed
control.
The nameplate values are shown based on the
“H” air flow. Therefore in the case of 36 Type,
the flow is 1059 ft.
3
/minute, while the External
Static Pressure is 0.72 in.Aq at “H” position. If
the external static pressure is too great (due to
long extension of duct, for example), the air flow
volume may drop too low at each air outlet.
Sealing tape
Drain joint
(supplied)
Drain pan
Drain opening
(25A or 1-11/32
" male screw)
Limit line
Limit line
H
H
M
M
L
883 1059 1236
Air Flow (ft.
3
/minute)
External Static Pressure
0
0.2
0.4
0.6
0.8
1.0
7.3
0
14.5
21.8
29.0
36.3
(in.Aq)( 10
-3
psi)
Limit li
ne
Limit li
ne
H
H,M
M
L
1059 1236 1412
Air Flow (ft.
3
/minute)
0
0.2
0.4
0.6
0.8
1.0
36 Type48 Type
H : At shipment
NOTE
External Static Pressure
7.3
0
14.5
21.8
29.0
36.3
(in.Aq)( 10
-3
psi)
Fig. 3-86
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07-007 W-2WAY_II_NA 1/23/07 6:09 PM Page 45