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036-21366-007-A-1205
4 Unitary Products Group
FAN SYSTEM - All 2-1/2, 3, 3-1/2 and 4 ton models operate
over a wide range of design conditions with a constant CFM,
electrically commutated (ECM) fan motor. These units easily
match all types of applications and provide greater on site
flexibility to match comfort requirement. These models have 2
cooling speeds and a single heating speed. The cooling
speed is factory set and can be field adjusted to a second
speed. The heating speed is factory set to maintain mid point
rise at the units heating input. It cannot be field adjusted. This
allows maximum comfort conditions.
Two ton models operate over a wide range of design condi-
tions with a 3-speed direct-drive fan motor. These single
phase models have the Comfort-Match system that allows
different speed taps for heating or cooling operations.
SIMPLE CONTROL CIRCUIT - A low voltage printed circuit
board contains a diagnostic indicator light and a low voltage
terminal strip. An additional set of pin connectors is also pro-
vided to simplify the field interface of external controls. Mate-
n-lock plug connectors are used. The electrical control box is
not located in the compressor compartment. The controls are
mounted on a Control-Tilt control panel to allow the access
cover to be removed for trouble shooting and maintenance
without affecting the normal system operating pressures. All
wiring internal to the unit is color/number coded.
PROTECTED COMPRESSOR - The compressor is internally
protected against high pressure and temperature. This is
accomplished by the simultaneous operation of high pressure
relief valve and a temperature sensor which protect the com-
pressor if undesirable operating conditions occur.
EXCLUSIVE COIL DESIGN - Grooved copper tubes and
enhanced aluminum fin construction improves heat transfer
for maximum efficiency and durability.
HEAT EXCHANGERS - Are corrosion-resistant, aluminized-
steel tubular construction to provide long-life, trouble-free
operation. The unique blow-through design also assures that
condensate does not collect in humid areas when in the cool-
ing cycle. This adds to longer heat exchanger life and higher
long term efficiencies.
POST PURGE INDUCED DRAFT COMBUSTION - Exhausts
combustion products from the heat exchanger upon comple-
tion of the heating cycle to prolong the heat exchanger life.
SELF DIAGNOSTIC FAN CONTROL MODULE - Due to this
self diagnostic control, less on site time is required to trouble
shoot these units.
HOT SURFACE TO PILOT IGNITION - Provides faster heat
delivery. This ignition is highly reliable, durable and elimi-
nates nuisance lockouts. Also assures starts in damp condi-
tions.
MULTI PORT IN-SHOT BURNERS - No field adjustment is
required to mix the air and gas. These burners are con-
structed of high-grade corrosion-resistant, aluminized-steel.
LOW MAINTENANCE - Long life, permanently lubricated
condenser and evaporator fan motor bearings need no
annual maintenance adding greater reliability to the unit.
Blower assembly can be easily cleaned by the unique Slip-
Track slide-out blower assembly.
SECURED SERVICE ACCESS PORTS - Protected, exter-
nally mounted, re-usable service access ports are provided
on both the high and low lines for ease of evacuating and
charging the system. No final field mounting required.
EASY SERVICE ACCESS - A large, single panel covers the
electrical and gas controls makes servicing easy. The blower
compartment has an additional large panel with a built-in
handle tab. Removing this panel will allow the blower assem-
bly to slide-out for easy removal for maintenance and ease of
trouble shooting.
REPLACEMENT PARTS - The installer requires no special
training to replace any of the components of these units and
does not need to maintain an inventory of unique parts.
SYSTEM INTEGRATION - Each unit has the internal ability
to integrate an electronic air cleaner or humidifier to work in
conjunction with the base unit.
FIELD-INSTALLED ACCESSORIES
LOW NOx KIT - Kit includes all the necessary hardware and
instructions to field convert units to reduce emissions to less
than 40 nanogram per Joule. California requirement on single
phase models only.
PROPANE CONVERSION KIT - Kit includes burner orifices,
gas valve conversion and installation instructions necessary
to field convert unit from natural gas to propane.
HIGH ALTITUDE CONVERSION KIT (Natural Gas/Propane)
- Kit includes all necessary labels and instructions to field
alter units with natural gas/propane for installations above
2000 feet. Burner orifices must be obtained from Source 1
Parts. Propane Conversion Kit must be obtained separately.
ECONOMIZER DOWN DISCHARGE / SUPPLY KIT - Modu-
lating integrated economizer provides simultaneous opera-
tion between the mechanical cooling and economizer
operation. Independent blade design insures proper control
and less than 1% leak rate. Includes hood and mesh bird
screen filter integrated into the hood, dry bulb sensor and
relief damper. Separate field accessories of single enthalpy
and dual enthalpy are also available. A built-in barometric
relief of 25% is provided.
SINGLE ENTHALPY SENSOR - Sensor replaces dry bulb
sensor standard in economizer kit. Provides improved econo-
mizer operation by sensing the dry bulb temperature from
outdoors plus the enthalpy content of the outdoor air.
DUAL ENTHALPY SENSOR - Additional sensor to single
enthalpy sensor. Sensor senses both the return air tempera-
ture dry bulb and humidity in conjunction with the single