6
• Confirm that the ceiling is able to support the weight of
the unit. See Table 1 for nominal weight.
• There should be enough room within the false ceiling for
installation and maintenance (see Fig. 4).
• The false ceiling should be horizontal and leveled.
• Install the unit in a location within the room that allows
uniform air flow in all directions.
Select the unit position with the following points in mind:
• The unit should be installed in a position that is suitable
to support the total weight of the unit, refrigerant piping
and condensate.
• Proper access should be provided for maintenance for
refrigerant piping, EXV (electronic expansion valve),
electrical box, and condensate pump. A 2-ft clearance is
recommended all around the unit.
• The unit should not be positioned directly above any
obstruction.
• The unit must be installed square and level.
• The condensate drain should have sufficient downward
slope (1 in. per 100 in.) in any horizontal run between
unit and drain. Maximum condensate lift is 29
1
/
2
inches.
Step 3 — Mount the Unit
INSTALLING HANGER BOLTS — Install the hanger bolts
at the locations shown in Fig. 2, top view. Use
3
/
8
-in. all-thread-
ed rod. For unit weight, see Table 1.
MOUNTING UNIT — The unit can now be lifted on to the
hanging rods for mounting.
1. Use rods and fasteners to suspend the unit at the factory-
provided mounting holes.
2. Adjust the height of the unit until the bottom is level with
the false ceiling, with adequate space to provide enough
pitch for the drain.
3. Secure the unit in position with locknuts and washers on
both sides of the mounting bracket. Ensure that the
threaded rod does not protrude more than 2 in. below the
mounting brackets as shown in Fig. 5.
INSTALLING DUCT — Connect the return and supply
ducts to the duct collars provided on the unit. Adequate dis-
tance between the return and supply diffusers should be main-
tained to avoid short circulation of air within the space. The fil-
ter is located on the return side of the unit, on the rear or bottom
depending on the return air inlet arrangement.
RETURN AIR ARRANGEMENT — Based on the return air
arrangement requirement in the field, the unit can be modified
from rear return to bottom return. As shown in Fig. 6, remove
return air duct collar/filter rack and plenum bottom panel.
Swap the position to change the rear return to bottom return ar-
rangement.
Step 4 — Connect Piping
CONDENSATE PIPING — The unit is supplied with a
1
1
/
4
-in. OD drain connection to connect copper or PVC drain
piping. When installing condensate piping, follow these recom-
mendations:
• Maximum pump lift is 29
1
/
2
inches.
• The highest point in the condensate piping should be as
close to the unit as possible. See Fig. 7.
IMPORTANT:
Be sure that the ceiling grid is supported
separately from the unit. The ceiling grid must not be
supported by an part of the unit or any associated wir-
ing or piping work.
MINIMUM DRAIN
TILT 1/100
a40-1849
Fig. 4 — False Ceiling Installation
a40-1722
Fig. 5 — Threaded Rod
PLENUM BOTTOM PANEL
SIDE RAIL
RETURN AIR DUCT COLLAR
FILTER RACK
A40-1852
Fig. 6 — Return Air Arrangement
DRAIN TILT 1/100
32 TO 40 in.
< 8 in.
24 in.
MAX.
a40-1850
Fig. 7 — Condensate Piping
