035-13329-001-B-0504
6
Unitary Products Group
NOT be sized to match the dimensions of the duct connec-
tions on the unit.
Refer to Figure 5 for information concerning side and bottom
supply and return air duct openings.
FILTERS
1" filters are supplied with each unit. 2" replacement filters
may be used with no modification to the filter racks. Filters
must always be installed ahead of the evaporator coil and
must be kept clean or replaced with same size and type. Dirty
filters will reduce the capacity of the unit and will result in
frosted coils or safety shutdown. Minimum filter area and
required sizes are shown in Table 2.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing com-
pound on male pipe threads. Install a condensate drain line
from the 3/4" PVC female connection on the unit to spill into
an open drain.
NOTE: The condensate drain line MUST be trapped to pro-
vide proper drainage. See Figure 2.
SERVICE ACCESS
Access to all serviceable components is provided by the fol-
lowing removable panels:
•
Compressor compartment
•
Heater compartment
•
Blower compartment
•
Main control box
•
Filter compartment
•
Motor Access (on units w/belt-drive option)
Refer to Figure 5 for location of these access panels.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be subject
to drafts, sun exposure, or heat from electrical fixtures or
appliances. Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure. Color coded
insulated wires (#18 AWG) should be used to connect ther-
mostat to unit. See Figure 4 for wiring details.
NOTE: If the unit has an economizer, remove jumper J1
from terminals 8 and 10 on the relay board to pre-
vent simultaneous operation of the compressor and
the economizer. If you want to control the econo-
mizer on a second stage of cooling, use a thermo-
stat with two stages of cooling.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the
National Electrical Code (NEC) ANSI/NFPA 70 (in USA), cur-
rent Canadian Electric Code (CEC) C22.1 (in Canada) and/or
local ordinances. The unit must be electrically grounded in
accordance with the NEC and CEC (as specified above) and/
or local codes. Voltage tolerances which must be maintained
at the compressor terminals during starting and running con-
ditions are indicated on the unit Rating Plate and Table 1.
The wiring harness furnished with this unit is an integral part
of a UL design certified unit. Field alteration to comply with
electrical codes should not be required.
A disconnect switch should be field provided for the unit. The
switch must be separate from all other circuits. Refer to Fig-
ure 5 for installation location. If any of the wire supplied with
the unit must be replaced, replacement wire must be of the
type shown on the wiring diagram.
Electrical lines must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired
with a separate branch circuit fed directly from the meter
panel and properly protected.
When fastening ductwork to the side duct flanges
on the unit, insert the screws through the duct
flanges only. DO NOT insert the screws through
the casing.
Outdoor ductwork must be insulated and water-
proofed.
FIGURE 2 - RECOMMENDED DRAIN PIPING
Make sure that all screws are replaced on the unit
to maintain an air-tight seal.
When connecting electrical power and control wir-
ing to the unit, waterproof type connectors MUST
BE USED so that water or moisture cannot be
drawn into the unit during normal operation. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.
