FACTORY-INSTALLED OPTIONS
ECONOMIZERS - Interlocked outdoor and return air dampers
are positioned by a fully modulating, spring return damper
actuator capable of introducing up to 100% outdoor air with
nominal 1% leakage type dampers. As the outdoor air intake
dampers open, the return air dampers close. The changeover
from compressor to economizer cooling is determined by one
or two solid state enthalpy controls.
On single enthalpy, an outdoor air sensor determines when the
outdoor air is cool and dry enough to provide “free” cooling. On
differential enthalpy, one sensor monitors the outdoor air while
a second sensor monitors the return air. Whenever the outdoor
air is cooler and drier than the return air, the unit will switch to
economizer operation. For either option, the first compressor
stage can provide additional cooling during economizer
operation if the room thermostat calls for second stage.
The dampers and controls are installed and wired at the factory.
Only the accessory rain hood needs to be assembled and
installed in the field.
These economizer options can be used on all duct configurations.
POWER EXHAUST - Both the single and differential
economizer options are available with power exhaust.
Whenever the outdoor air intake dampers are opened for free
cooling, the exhaust fan will be energized to prevent the
conditioned space from being over-pressurized during
economizer operation.
The exhaust fan, motor and controls are installed and wired at
the factory. Only the back-draft damper assembly needs to be
field installed and the accessory rain hoods need to be
assembled and installed in the field.
The power exhaust option can only be used on bottom duct
configurations.
MOTORIZED OUTDOOR AIR INTAKE DAMPER - Interlocked
outdoor and return air dampers are controlled by a 2-position,
spring return damper actuator. The outdoor damper will open
to some pre-set position whenever the supply air blower is
operating and will drive fully closed when the blower shuts
down.
The damper and controls are installed and wired at the factory.
Only the accessory rain hood needs to be assembled in the field.
This damper option can be used on all duct configurations.
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.
On units built prior to January 1995, an accessory field harness
must be installed.
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 contain one sensor that monitors the
outdoor air and one sensor that monitors the return air. The
logic module compares these two values and modulates the
dampers providing the maximum efficiency of economizer
system.
The rainhood is painted to match the basic unit and must be
field-assembled before installing.
On units built prior to January 1995, an accessory field harness
must be installed.
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.
On units built prior to January 1995 an accessory field harness
must be installed.
Power exhaust is not available as a field installed option.
ROOF CURBS - 343mm (14") 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 supports.
ANTI-RECYCLE TIMERS - Three solid state timers prevent
the compressors from short-cycling. Once a compressor is
de-energized, it will remain de-energized for approximately five
minutes.
HIGH ALTITUDE NATURAL GAS - Burner orifices and pilot
orifices are provided for proper furnace operation at altitudes
up to 1824m (6,000 ft).
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
1824m (6,000 ft). This accessory supplements the basic
propane conversion kit.
SIDE DUCT FLANGES - 25mm (1") flanges replace the supply
and return air panels on the rear of the unit to accommodate
horizontal duct connections. These flanges can also be used
individually for bottom supply/horizontal return or horizontal
supply/bottom return. They cannot be used on units with power
exhaust.
TABLE OF CONTENTS
Physical Data ....................................................................... 6
Electrical Data - Clg. and Gas Heating................................ 6
Electrical Data - Units with Electric Heating ........................ 6
Field Wiring (DCE/DCG Units) ............................................ 7
Unit Dimensions................................................................... 8
Roof Curb Dimensions....................................................... 10
Typical Applications ............................................................11
Description ........................................................................... 1
Factory-Installed Options..................................................... 2
Field-Installed Accessories .................................................. 2
Ratings ................................................................................. 3
Cooling Capacities............................................................... 4
Blower Performance ............................................................ 5
Static and Power Exhaust Resistances............................... 5
Blower Motor and Drive Data .............................................. 5
530.26-TG4YI
2
Unitary Products Group
