39
PRE-INSTALLATION
Unpack Unit
Remove the banding straps and lift the cardboard lid. Remove
the fascia, packed in bubble wrap, and polystyrene packing
pieces to expose the unit.
When removing the unit chassis from the box, the four corner
brackets should be utilized for lifting. In order to protect the
fascia from dirt and damage, it should be returned to the box
until it is ready to be installed.
Blank Off Pieces
When branch ducting is to be used, polystyrene pieces for
blanking off fascia openings are included with the fascia
packing. Up to two opposing sides may be blanked off. See
“Duct Collars” in Installation section, page 40.
Positioning
The unit installation position should be selected with the fol-
lowing points in mind:
1. The appliance must be installed on a structure that is suit-
able to support the total weight of the appliance, piping,
and condensate.
2. Piping, electrical panel and condensate pump access
panel should be readily accessible for maintenance pur-
poses. A 2-ft clearance is recommended around the elec-
trical panel and condensate pump access panel.
3. The unit should not be positioned less than 5 ft from a
wall or similar obstruction, or in a position where the dis-
charge air could blow directly on to the thermostat. A 5-
ft clearance is required below the unit for service access.
4. The unit should not be positioned directly above any
obstructions.
5. The unit must be installed square and level.
6. The condensate drain should have sufficient downward
slope (1 inch in 100-in.) in any horizontal run between
unit and drain. Maximum condensate pump lift is
30 inches.
7. There should be sufficient room above the false ceiling
for installing the unit. Minimum distance as shown
in Fig. 37.
8. In case of high humidity, clogged or damaged conden-
sate piping, incorrect installation or faulty condensate
pump, water may drip from the unit. Do not install the
appliance where dripping water can cause damage.
Ceiling Opening Sizes
An opening in the false ceiling will then have to be cut to the
size shown in Table 2.
Fig. 37 — Minimum Distance to Ceiling
Table 2 — Ceiling Opening Dimensions
A cardboard template for ceiling cutout and rod positions is
included with the unit.
Positioning the Electro-Mechanical Thermostat
In addition to positioning the unit correctly, it is very import-
ant to locate the wall-mounted thermostat in the optimum po-
sition to ensure good temperature control. Therefore, the in-
stallation should be selected with the following points in
mind:
1. Position the thermostat approximately 48-in. above floor
level.
2. Do not position thermostat where it can be directly
affected by the unit's discharge airstream.
3. Avoid external walls and drafts from windows and doors.
4. Avoid positioning near shelves and curtains as these
restrict air movement.
5. Avoid heat sources e.g., direct sunlight, heaters, dimmer
switches and other electrical devices.
INSTALLATION
Hanger Bolts
The hanger bolts can now be installed at the centers shown in
Fig. 38. Use
3
/
8
-in. all thread rod.
Check the strength of the unit mounting hanger bolts. Refer to
Table 1 for unit weights.
Fig. 38 — Hanger Bolt Mounting Dimensions
Installation Guide
An installation guide is included in the Carrier Owner Infor-
mation packet provided with the unit. Prepare the installation
guide by folding the flat metal piece, by hand, along the per-
forations as shown in Fig. 39.
INSTALLATION GUIDE SETUP
The unit can now be lifted onto the hanging rods and leveled
at the correct distance from the ceiling with the aid of the in-
stallation guide.
1. Hold the tab on the installation guide against the bottom of
the cassette case with the guide pointing away from the
cassette. See Fig. 40. Adjust the height of the cassette until
the guide is level with the bottom of the false ceiling.
DANGER
Appliances must not be installed where they may be ex-
posed to potentially explosive or flammable atmosphere.
42WKN UNIT SIZE
DIMENSION A (in.)
08,12
12
3
/
4
18,20
11
1
/
2
33,36
13
1
/
2
A
30 in.
MAX.
a42-4049
42WKN UNIT SIZE
DIMENSIONS (in.)
08,12
23-in. x 23-in.
18,20
34-in. x 34-in.
33,36
46-in. x 34-in.
IMPORTANT: Make sure the ceiling grid is supported
separately from the appliance. The ceiling must not be
supported by any part of the appliance, fascia or any as-
sociated wiring or pipe work.
42WKN
UNIT SIZE
DIMENSIONS (in.)
A
B
08,12
19
1
/
2
23
18,20
28
1
/
2
31
1
/
2
33,36
28
1
/
2
43
1
/
2
