FIELD-INSTALLED ACCESSORIES
SINGLE INPUT ELECTRONIC ENTHALPY ECONOMIZERS
Includes a slide-in / plug-in damper assembly with fully
modulating spring-return motor 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 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.
DUAL INPUT ELECTRONIC ENTHALPY ECONOMIZERS
Includes a slide-in / plug-in damper assembly with fully
modulating spring-return motor actuator capable of introducing
up to 100% outdoor air with nominal 1% leakage type dampers.
This enthalpy system contains one sensor that monitors the
outdoor air and one sensor that monitors the return air. The
logic module compares the two values and modulates the
dampers, providing the maximum efficiency of the economizer
system.
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.
MOTORIZED OUTDOOR AIR INTAKE DAMPER - Includes a
slide-in / plug-in damper with a 2-position, spring-return motor
actuator which opens to a pre-set position whenever the supply
air blower is operating and drives fully closed when the blower
shuts down.
On units built prior to January 1995 an accessory field harness
must be installled.
Power exhaust is not available as a field installed option.
BAROMETRIC RELIEF DAMPER - This damper accessory
can be used to relieve internal air pressure on units with an
economizer. 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.
ROOF CURBS - Roof curbs, 356mm (14 in.) high, 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.
SIDE DUCT FLANGES - Twenty-five millimeter (1 in.) 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.
HIGH SPEED DRIVE - A smaller blower pulley, a larger motor
pulley (including a replacement belt) increase the speed of the
supply air blower for applications with a higher airflow and/or
static pressure requirement.
ANTI-RECYCLE TIMERS - Two solid state timers prevent the
compressors from short-cycling. Once a compressor is
de-energized, it remains de-energized for approximately five
minutes.
LOW AMBIENT CONTROLS TO 18°C (0°F) - A n
autotransformer and a thermostat maintain stable system
operation by reducing the speed of the #1 condenser fan motor
at low oudoor temperatures. The kit also includes a 1-phase
motor to replace the unit’s standard 3-phase condenser fan
motor. Standard units can operate down to 4 °C (25 °F).
TABLE OF CONTENTS
Electrical Data - Cooling and Gas Heat ............................. 13
Electrical Data - Units with Electric Heat............................ 14
Physical Data ..................................................................... 14
Unit Dimensions ................................................................. 15
Roof Curb Dimensions ....................................................... 18
Typical Applications ............................................................ 18
Description ........................................................................... 1
Field-Installed Accessories................................................... 2
Ratings ................................................................................. 3
Cooling Capacities ............................................................... 4
Blower Performance............................................................. 8
Blower Motor and Drive Data ............................................. 12
Static Resistances................. .............................................10
Field Wiring ........................................................................ 13
530.26-TG3YI
2
Unitary Products Group
