035-17311-000 REV A (1200)
14 Unitary Products Group
DUCTWORK
Ductwork should be designed and sized according to the
methods in Manual D of the Air Conditioning Contractors of
America (ACCA) or as recommended by any other recog-
nized authority such as ASHRAE or SMACNA.
A closed return duct system should be used. This will not
preclude use of economizers or outdoor fresh air intake. The
supply and return air duct connections at the unit should be
made with flexible joints to minimize noise.
The supply and return air duct systems should be designed
for the CFM and static pressure requirements of the job.
They should NOT be sized to match the dimensions of the
duct connections on the unit.
Refer to Figure 11 for bottom air duct openings. Refer to Fig-
ure 11 for side air duct openings.
DUCT COVERS
Units are shipped with the side duct openings covered. For
bottom duct application, no duct cover changes are neces-
sary. For side duct application, remove the side duct covers
and install over the bottom duct openings.
CONDENSATE DRAIN
The side condensate drain is reversible and maybe re-ori-
ented to the rear of the cabinet to facilitate condensate pip-
ing. A condensate drain connection is available through the
base pan for piping inside the roof curb. Trap the connection
per Figure 15. The trap and drain lines should be protected
from freezing.
Plumbing must conform to local codes. Use a sealing com-
pound on male pipe threads. Install condensate drain line
from the 3/4 inch NPT female connection on the unit to an
open drain.
COMPRESSORS
The compressors are mounted on elastomer insulators. The
mounting bolts have been fully tightened for shipping. Do not
loosen the compressor mounting bolts.
FILTERS
Two-inch filters are supplied with each unit. One-inch filters
may be used with no modification to the filter racks. Filters
must always be installed ahead of evaporator coil and must
be kept clean or replaced with same size and type. Dirty fil-
ters reduce the capacity of the unit and result in frosted coils
or safety shutdown. All units use four (4) 20”x25”x2” filters.
The unit should not be operated without filters properly
installed.
THERMOSTAT WIRING
The thermostat should be located on an inside wall approxi-
mately 56 inch above the floor where it will not be subject to
drafts, sun exposure or heat from electrical fixtures or appli-
ances. Follow the manufacturer's instructions enclosed with
thermostat for general installation procedure. Seven (7)
color-coded, insulated wires should be used to connect the
thermostat to the unit. Refer to Table 11 for control wire sizing
and maximum length.
When fastening ductwork to side duct flanges on
unit, insert screws through duct flanges only. DO
NOT insert screws through casing. Outdoor duct-
work must be insulated and water-proofed.
FIGURE 15 : CONDENSATE DRAIN
Make sure that panel latches are properly posi-
tioned on the unit to maintain an airtight seal.
TABLE 11: CONTROL WIRE SIZES
Wire Size
Maximum Length
1
1.
From the unit to the thermostat and back to the unit.
18 AWG
150 Feet
To Next Page
Loading...
Need help?
General
