—2—
Corporate thermostats
include the Time Guard® II anti-short
cycle protection circuitry. If a non-corporate thermostat without
anti-short cycle protection is used the Time Guard II field in-
stalled anti-short cycle kit is recommended.
Refrigerant system
is designed to provide dependability. Liquid
filter dryers are used to promote clean, unrestricted operation.
Each unit leaves the factory with a full refrigerant charge. Refrig-
erant service connections make checking operating pressures
easier.
HIGH AND LOW PRESSURE SWITCHES
provide added reli-
ability for the compressor.
Evaporator and condenser coils
are computer-designed for
optimum heat transfer and cooling efficiency. The evaporator
coil is fabricated from copper tube and aluminum fins and is lo-
cated inside the unit for protection against damage. The con-
denser coil is internally mounted on the top tier of the unit.
Copper fin coils and pre-coated fin coils are available from the
factory by special order. These coils are recommended in appli-
cations where aluminum fins are likely to be damaged due to
corrosion. They are ideal for seacoast applications.
Low sound ratings
ensure a quiet indoor and outdoor environ-
ment with sound ratings as low as 72 dB. (See page 3.)
Easy to service cabinets
provide easy single-panel accessibility
to serviceable components during maintenance and installation.
The unit base with integrated drain pan provides easy ground lev-
el installation with or without a mounting pad. Convenient rigging
holds are provided to manipulate the unit on the jobsite. A nesting
feature ensures a positive unit base to roof curb seal when the unit
is roof mounted. A convenient 3/4-in. wide perimeter flange
makes frame mounting on a rooftop easy.
Standard metal duct covers
with insulation come with the unit
and cover the horizontal duct openings. These can be left in place
if the units are converted to downflow.
Downflow operation
is easily provided in the field to allow ver-
tical ductwork connections. The basepan utilizes knockout style
seals on the bottom openings to ensure a positive seal in the
horizontal airflow mode.
Integrated Gas Control (IGC) board
provides safe and efficient
control of heating and simplifies trouble-shooting through its
built-in diagnostic function.
Cabinets
are constructed of heavy-duty, phosphated, zinc-
coated prepainted steel capable of withstanding 500 hours in
salt spray. Interior surfaces of the evaporator/heat exchanger
compartment are insulated with cleanable semi-rigid insulation
board, which keeps the conditioned air from being affected by
the outdoor ambient temperature and provides improved indoor
air quality. (Conforms to American Society of Heating, Refriger-
ation and Air Conditioning Engineers No. 62P.) The sloped drain
pan minimizes standing water in the drain, which is provided with
an external drain fitting.
Louvered Grille
provides hail and vandalism protection.
574B N W 024 040 N VS
Model Number
574B
– Single
Packaged Gas
Heating/Electric
Cooling
Electrical Supply
N
– 208/230-1-60
P
– 208/230-3-60
Fuel
W
– Natural Gas
P
– Propane Gas
Low NO
x
Indicator
N
– Low NO
x
Unit
Only used if ordering NO
x
units
Nominal Cooling Capacity
024
– 2 ton
030
– 2.5 ton (not yet available)
036
– 3 ton
042
– 3.5 ton (not yet available)
048
– 4 ton
060
– 5 ton
Heat Input Size
040
– 40,000
060
– 60,000
090
– 90,000
115
– 115,000
130
– 130,000
LEGEND
CU
—Copper
AL
— Aluminum
Options
BT
– AL evap, vinyl condens
CC
– AL evap, CU condens
CU
– CU evap & condens
TP
– Base unit with tin plated indoor coil
hair pins
TV
– TP with vinyl coating on outdoor coil
TC
– TP with AL indoor coil and CU/CU
outdoor coil
Only used if ordering an option
MODEL NUMBER NOMENCLATURE