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51
U
Fig. 3-97
Inter-unit control wiring
Power supply outlet
(4) When the check of drainage is complete, open the check pin (CHK)
and remount the insulator and drain cap onto the drain inspection port.
CAUTION
Be careful since the fan will start when you
short the pin on the indoor control board.
HT: Using the booster cable
H: At shipment
177
Air Flow (CFM) Air Flow (CFM)
0
353
Limit line
Limit line
HT
H
M
L
706353
Limit line
Limit line
HT
H
L
M
1059
0
706
Limit line
HT
L
M
H
Limit line
530353
Limit line
Limit line
HT
M
L
H
18 Type 7, 12 Type
Indoor Fan Performance
24 Type
36 Type
NOTE
External Static Pressure
0.20
0.40
0.60
(in. WG)
Air Flow (CFM) Air Flow (CFM)
0
External Static Pressure
0.20
0.40
0.60
(in. WG)
External Static Pressure
0.20
0.40
0.60
(in. WG)
0
External Static Pressure
0.20
0.40
0.60
(in. WG)
(1) Remove 4 screws on the electrical component box and
remove the cover plate.
(2) Disconnect the fan motor sockets in the box.
(3) Take out the booster cable (sockets at both ends)
clamped in the box.
(4) Securely connect the booster cable sockets between the
disconnected fan motor sockets in step 2 as shown in
Fig. 3-98.
(5) Place the cable neatly in the box and reinstall the cover
plate.
Fig. 3-98
Fig. 3-99
Booster cable
Booster cable
Electrical component box
(At shipment) (Booster cable installed)
Fan motor socket
Fan
motor
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 curves for “HT,” “H,” “M” and “L” fan
speed control are shown. The nameplate values are
shown based on the “H” air flow. For the 24 type, the air
flow is 635 CFM, while the external static pressure is
0.20 in. WG at “H” position. If external static pressure is
too great (due to long extension of ducts, for example),
the air flow volume may drop too low at each air out-
let. This problem may be solved by increasing the fan
speed as explained above.
3-24. Increasing the Fan Speed
If external static pressure is too great (due to long extension of ducts, for
example), the air flow volume may drop too low at each air outlet. This problem
may be solved by increasing the fan speed using the following procedure: