Fujitsu 9384203007-04 Manuel D'installation page 7

(5) Turn the heat exchanger by 180 degrees and install it.
(6) Install the sheet metal in the center.
(7) Thermistor installation is diff erent depending on the 24/30 models or 36/48 models. The
work is described individually.
■ For 24/30 models
② Thermistor (room)
Thermistor (pipe)
① Hole plug
① Pass two thermistor cables through the hole plug.
(Form a slit in the center of hole plug.)
② Fix the thermistor. (Fix one thermistor support bracket with screw.)
Change the wiring layout of thermistor (pipe), but replacement work is not required.
③ Install the connectors. Install the control box cover and fi x it with mounting screws.
④ For 24/30 models, fi x the cable at two places and for 36/48 models, fi x it at three
places with cable ties.
■ For 36/48 models (Perform steps
② Thermistor (room)
Thermistor (pipe)
9384203007-04.indb 7 9384203007-04.indb 7
④ Cable tie
③ Connector
to in the same way as 24/30 models.)
① ④
④ Cable tie
③ Connector
① Hole plug
(8) Finally install three sheet metals.
CAUTION
Confi rm the directions of the air intake and outlet before installing the unit.
The unit takes in air from the evaporator side, and expels it from the fan side.
3. 4. 1. Installation in an unconditioned space
The exterior cabinet of an air handler has a greater risk of sweating when installed in an
unconditioned space than when it is installed in the conditioned space. This is primarily due
to the temperature of the conditioned air moving through the air handler and the air circulating
around the unit where it is installed. For this reason, the following is recommended for all air
handler applications, but special attention should be paid to those installed in unconditioned
spaces:
• Duct sizing and airfl ow are critical and must be based on the equipment selected.
• Supply and return duct attachment: If other than the factory fl anges are used, the
attachment of ducting must be insulated and tight to prevent sweating.
• No perimeter supply fl anges are provided. If a full perimeter supply duct is used, it is the
responsibility of the installer to provide duct fl anges as needed, to secure and seal the supply
duct to prevent air leakage and the sweating that will result.
• Apply caulking around all cabinet penetrations such as power wires, control wires, refrigerant
tubing and condensate line where they enter the cabinet. Seal the power wires on the inside
where they exit conduit opening. Sealing is required to prevent air leakage into the unit which
can result in condensate forming inside the unit, control box, and on electrical controls. Take
care not to damage, remove or compress insulation when applying the caulk.
• In some cases, the entire air handler can be wrapped with insulation. This can be done as
long as the unit is completely enclosed in insulation, sealed and service access is provided to
prevent accumulation of moisture inside the insulation wrap.
• An auxiliary overfl ow pan is recommended to protect the structure from excessive cabinet
sweating or a restricted coil drain line. (See Section 3.4.5.)
• If an electric heater kit is installed, be sure the breaker or disconnect cover is sealed tightly
to the door panel.
3. 4. 2. Installation in mobile/ manufactured homes
(1) Air handler must be secured to the structure using "L" brackets or pipe strap.
(2) Allow a minimum of 24 in (610 mm) front clearance required to access doors.
(3) Recommended method for securing air handler:
A. If air handler is against the wall, secure top of air handler to wall stud using two 16ga
thick angle brackets one on each side. Attach brackets with No. 10 self-tapping 1⁄2 in
(12.7 mm) long screws to air handler and use 5⁄16 in (7.9 mm) lag screws 5-1⁄2 in (140
mm) long to wall stud. Secure bottom of unit with two 16ga "L" brackets with No. 10 self-
tapping 1⁄2 in (12.7 mm) long screws to air handler and use 5⁄16 in (7.9 mm) lag screws
5-1⁄2 in (140 mm) long to fl oor.
B. If air handler is away from wall attach pipe strap to top of air handler using No. 10 1⁄2
in (12.7 mm) long self-tapping screws on both sides. Angle strap down and away from
back of air handler, remove all slack, and fasten to wall stud of structure using 5⁄16 in (7.9
mm) lag screws 5-1⁄2 in (140 mm) long. Secure bottom of unit with two 16ga "L" brackets
with No. 10 self-tapping screws to air handler and use 5⁄16 in (7.9 mm) lag screws 5-1⁄2 in
(140 mm) long to fl oor.
En-7
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