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036-21359-001-B-0302
Unitary Products Group 3
FIELD-INSTALLED ACCESSORIES
SINGLE INPUT ELECTRONIC ENTHALPY
ECONOMIZERS
Includes a slide-in/plug-in damper assembly with fully
modulating spring-return monitor actuator capable of
introducing up to 100% outdoor air with nominal 1%
leakage type dampers.
The enthalpy system contains one sensor that
monitors the outdoor air and determines when the air is
cool enough and dry enough to provide “free” cooling.
The rainhood is painted to match the basic unit and
must be field-assembled before installing.
Power exhaust is not available as a field installed
option.
DUAL INPUT ELECTRONIC ENTHALPY
ECONOMIZERS
Includes a slide-in / plug-in damper assembly with fully
modulating spring-return monitor actuator capable of
introducing up to 100% outdoor air with nominal 1%
leakage type dampers.
This enthalpy system contains one sensor that moni-
tors the outdoor air and one sensor that monitors the
return air. The logic module compares these two val-
ues and modulates the dampers providing the maxi-
mum efficiency of economizer system.
The rainhood is painted to match the basic unit and
must be field-assembled before installing.
Power exhaust is not available as a field installed
option.
MOTORIZED OUTDOOR AIR INTAKE DAMPER
Includes a slide-in/plug-in damper assembly with a
2-position, spring return motor actuator which opens to
some pre-set position whenever the supply air blower
is operating and will drive fully closed when the blower
unit shuts down.
The rain hood is painted to match the basic unit and
must be field assembled before installing.
Power exhaust is not available as a field installed
option.
ROOF CURBS
Fourteen inch high roof curbs provide a water-tight seal
between the unit and the finished roof. These full
perimeter curbs meet the requirements of the National
Roofing Contractors Association (NRCA) and are
shipped knocked-down for field assembly. They're
designed to fit inside the base rails of the unit and
include both a wood nailing strip and duct hanger sup-
ports.
ANTI-RECYCLE TIMERS
Two solid state timers prevent the compressors from
short-cycling. Once a compressor is de-energized, it
will remain de-energized for approximately five min-
utes.
HIGH ALTITUDE NATURAL GAS
Burner orifices and pilot orifices are provided for proper
furnace operation at altitudes up to 6,000 feet.
PROPANE
Burner orifices, pilot orifices and gas valve parts are
provided to convert a natural gas furnace to propane.
HIGH ALTITUDE PROPANE
Burner orifices and pilot orifices are provided for proper
furnace operation at altitudes up to 6,000 feet. This
accessory supplements the basic propane conversion
kit.
SIDE DUCT FLANGES
One inch flanges replace the supply and return air pan-
els on the rear of the unit to accommodate horizontal
duct connections. These flanges can also be used indi-
vidually for bottom supply/horizontal return or horizon-
tal supply/bottom return. They cannot be used on units
with power exhaust.
BAROMETRIC RELIEF DAMPER
This damper accessory can be used to relieve internal
air pressure on units with an economizer but no power
exhaust. This accessory includes a rain hood, a bird
screen and a fully assembled damper. With bottom
duct connections, the damper should be mounted over
the opening in the return air panel. With horizontal
ductwork, the accessory should be mounted on the
return air duct.
ECONOMIZER / POWER EXHAUST RAIN HOODS
A rain hood accessory must be used on units with an
economizer, a motorized damper, or a combined econ-
omizer with power exhaust option. These accessories
include all the hood panels, the necessary components
and hardware for field assembly.
HIGH SPEED DRIVE
A smaller blower pulley and a shorter belt increase the
speed of the supply air blower for applications with a
higher CFM and/or static pressure requirement.
LOW AMBIENT CONTROLS TO 0°F
An autotransformer and a thermostat maintain stable
system operation by reducing the speed of the con-
denser fan motor at low outdoor temperatures. The kit