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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)
D
(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
G
This unit has high static pressure (applicable external static
pressure Max. 0.68 – 0.88 in.WG. 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.
G
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.
G
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
(in.WG) while the horizontal axis represents the
Air Flow (CFM). 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 CFM, while the External Static
Pressure is 0.72 in.WG 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.
Drain pan
36 Type
(in.WG)
1.00
0.80
0.60
0.40
0.20
0
883
1059
1236
Air Flow (CFM)
NOTE
H: At shipment
46
Sealing tape
Drain opening
(25A or 1-11/32 " male screw)
Fig. 3-83
Downward gradient
Min. 1/100
Good
Not good
Fig. 3-84
Min. 1-31/32 in.
Inspection plug
Fig. 3-85
48 Type
(in.WG)
1.00
0.80
0.60
0.40
0.20
0
1059
1236
Air Flow (CFM)
Fig. 3-86
Drain joint
(supplied)
1412
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