Preparation; Drain Installation; Condensate Drain - Fujitsu 9384203007-04 Manuel D'installation

3. 4. 7. Duct fl anges
•Duct fl anges (2 pieces) are shipped with the unit and are to be fi eld installed on the top of
the air-handler using the following procedure and referring to Figure.
(1) Loosen the screws attaching the heat barrier to the cabinet.
(2) Form a 90° bend with the short leg length at approximately 9.9" from the end where the
slot is cut in the fl ange to facilitate bending. For this model 21 in (533 mm) wide cabinet,
cut the long leg as shown in Figure to match the cabinet width.
(3) Side the duct fl anges onto the screws loosened in step one above. Tighten the screws
to secure the fl anges.
3. 4. 8. Ductwork
•Field ductwork must comply with the National Fire Protection Association NFPA 90A,
NFPA 90B and any applicable local ordinance.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered with a
vapor barrier. Fibrous ductwork may be used if constructed and installed in accordance
with SMACNA Construction Standard on Fibrous Glass Ducts. Ductwork must comply with
National Fire Protection Association as tested by U/L Standard 181 for Class I Air Ducts.
Check local codes for requirements on ductwork and insulation.
• Duct system must be designed within the range of external static pressure the unit is
designed to operate against. It is important that the system airfl ow be adequate. Make
sure supply and return ductwork, grills, fi lters, accessories, etc. are accounted for in
total resistance. Refer to the airfl ow performance tables in this manual to determine the
available external static pressure for the particular air-handler model being installed.
• Design the duct system in accordance with "ACCA" Manual "D" Design for Residential
Winter and Summer Air Conditioning and Equipment Selection. Latest editions are
available from: "ACCA" Air Conditioning Contractors of America, 1513 16th Street, N.W.,
Washington, D.C. 20036. If duct system incorporates fl exible air duct, be sure pressure
drop information (straight length plus all turns) shown in "ACCA" Manual "D" is accounted
for in system.
• Supply plenum is attached to the duct fl anges supplied with the unit. See Section 3.4.7.
• IMPORTANT: If an elbow is included in the plenum close to the unit, it must not be
smaller than the dimensions of the supply duct fl ange on the unit.
• IMPORTANT: The front fl ange on the return duct if connected to the blower casing must
not be screwed into the area where the power wiring is located. Drills or sharp screw
points can damage insulation on wires located inside unit.
• Secure the supply and return ductwork to the unit fl anges, using proper fasteners for the
type of duct used and tape or caulk the duct-to-unit joint as required to prevent air leaks.
• Do not operate the system without fi lters. A portion of the dust entrained in the air may
temporarily lodge in the duct runs and at the supply registers.
• Any circulated dust particles could be heated and charred by contact with the heating
elements. This residue could soil ceilings, walls, drapes, carpets and other articles in
the house. Operating the system without a fi lter will also allow lint and dirt particles to
accumulate on the indoor coil fi n and restrict air-fl ow through the coil. Soot damage may
occur even with fi lters in place
3. 4. 9. Return air fi lter
•An internal fi lter rack is not provided with this air-handler. Therefore, an external means
of fi ltering the return air is required. External fi lters should be sized for a maximum of 300
feet/min air velocity or the maximum velocity recommended by the type of fi lter installed.
One or more return air fi lter grilles, a fi lter rack attached to unit return air intake, or a fi lter
rack installed between a sealed return air platform and the return duct are all acceptable
means of fi ltration. All return ducts must be fi ltered, either at each return grille or at a
common fi lter near the unit.
Filter type, sizing, and placement are critical to heating and cooling system performance.
Reduced air-fl ow can shorten the life of system components such as the compressor,
indoor coil, heater elements, over temperature limits, and relays. As fi lters near the end
of their useful life, the pressure drop through them increases. Therefore, it is important to
factor the "end of life" (dirty) pressure drop of fi lters into the external static pressure of the
duct system when selecting blower speeds and designing ductwork to assure the system
is operating at the design CFM and system reliability is not compromised.
Always verify that the system's air-fl ow is within specifi cations by performing a
temperature rise (heating mode) and/or temperature drop (cooling mode) with all fi lters in
place. Important: High effi ciency pleated fi lters and electronic air cleaners typically have
signifi cantly higher pressure drop than standard effi ciency fi berglass fi lters, especially
when they get dirty. Do not use high effi ciency fi lters or electronic air cleaners unless
adequate fi lter area is provided to lower the fi lter pressure drop to an acceptable level.
9384203007-04.indb 9 9384203007-04.indb 9
WARNING

3. 4. 10. Preparation

•The coil is shipped with a low pressure (5-10 psig) charge of dry nitrogen which will be
released when the rubber plugs are removed.
Leave the rubber plugs in the refrigerant connection pipe on the air-handler until the
refrigerant lines are ready to be connected to prevent contaminants from entering the coil.
CAUTION
• Make sure the drain water is properly drained.
• To prevent people from touching the parts inside the unit, be sure to install grilles on
the inlet and outlet ports. The grilles must be designed in such a way that cannot be
removed without tools.
• Set the appropriate external static pressure within the permissible range.
• If an intake duct is installed, take care not to damage the temperature sensor (the
temperature sensor is attached to the intake port fl ange).
• Be sure to Install the air inlet grille and air outlet grille for air circulation. The correct
temperature cannot be detected.
• When connecting the duct, perform duct-insulation appropriate for the installing envi-
ronment.
Inappropriate insulation work may cause condensation on the surface of the insulat-
ing material, and may lead to condensation dripping.

3. 5. Drain installation

CAUTION
• Install the drain hose in accordance with the instructions in this installation manual
and keep the area warm enough to prevent condensation. Problems with the piping
may lead to water leaks.
• Be sure to properly insulate the drain hose so that the water will not drip from the
connected parts.
• The position of the installed drain hose should have a downward gradient of 1/100 or
more.
• Do not connect the drain hose in which ammonia or other types of gas aff ecting the
unit is generated. Heat exchange erosion may occur.
Install the drain hose according to the measurements given in the following fi gure.
1-1/8 (28)
1-1/16 (27)
1-3/8
(30)
2-13/16 (72)
5-1/4 (134)
5-3/8 (136)

3. 5. 1. Condensate drain

Consult local codes or ordinances for specifi c requirements.
IMPORTANT: When making drain fi tting connections to the drain pan, use a thin layer of
Tefl on paste, silicone or Tefl on tape and install hand tight.
IMPORTANT: When making drain fi tting connections to drain pan, do not overtighten.
Overtightening fi ttings can split pipe connections on the drain pan.
• Install drain lines so they do not block service access to front of the unit. Minimum clear-
ance of 24 in (600 mm) is required for fi lter, coil or blower removal and service access.
• Although the condensate drain pan is designed is designed to be self draining, it is
recommended that the air-handler cabinet be pitched slightly downward toward the
primary drain connection to assure the condensate drains completely from the drain
pan. The downward pitch should be approximately 1/8 in (3 mm) per foot and in both
axes.
• Do not reduce drain line size less than connection size provided on condensate drain
pan.
• All drain lines must be pitched downward away from the unit a minimum of 1/8" per foot
of line to ensure proper drainage.
• Do not connect condensate drain line to a closed or open sewer pipe. Run condensate
to an open drain or outdoors.
• The drain line should be insulated where necessary to prevent sweating and damage
due to condensate forming on the outside surface of the line.
Unit: in (mm)
En-9
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