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RT-PRC016-EN
Accessories/Options
Electric Heaters — Field-installed electric
heat modules shall be available for
installation within basic unit. Electric
heater elements shall be constructed of
heavy-duty nickel chromium elements
internally delta connected for 200 volt,
wye connected for 380-415 volt. Staging
shall be achieved through the unitary
control processor (UCP). Each heater
package shall have automatically reset
high limit control operating through
heating element contactors. All heaters
shall be individually fused from the
factory, where required. Power
assemblies shall provide single-point
connection.
Roof Curb — The roof curb shall be
designed to mate with the unit’s
downflow supply and return and provide
support and a water tight installation
when installed properly. The roof curb
design shall allow field-fabricated
rectangular supply/return ductwork to be
connected directly to the curb. Curb shall
be shipped knocked down for field
assembly and shall include wood nailer
strips.
Economizer — This accessory shall be
either field or factory-installed and shall
be available with or without barometric
relief. The assembly includes fully
modulating 0-100 percent motor and
dampers, minimum position setting,
preset linkage, wiring harness with plug,
spring return actuator and fixed dry bulb
control. The barometric relief shall
provide a pressure operated damper that
shall be gravity closing and shall prohibit
entrance of outside air during the
equipment “off” cycle. Optional solid
state or differential enthalpy control shall
be available for either factory or field
installation. The factory-installed
economizer arrives in the shipping
position and shall be moved to the
operating position by the installing
contractor.
Remote Potentiometer — The minimum
position setting of the economizer shall
be adjusted with this accessory.
Manual Outside Air Damper — Factory
or field-installed rain hood and screen
shall provide up to 50 percent outside air.
Mechanical
Specifications
Motorized Outside Air Dampers —
Factory or field-installed manually set
outdoor air dampers shall provide up to
50 percent outside air. Once set, outdoor
air dampers shall open to set position
when indoor fan starts. The damper
shall close to the full closed position
when indoor fan shuts down.
Discharge Air Sensing — This factory of
field-installed option provides true
discharge air sensing in heating models.
This sensor is a status indicator readable
through Tracer
™
or Tracker
™
.
Oversized Motors — Factory or field-
installed oversized motors shall be
available for high static applications.
Clogged Filter/Fan Failure Switch — A
dedicated differential pressure switch is
available, factory-installed, to achieve
active fan failure indication and/or
clogged filter indication. These
indications will be registered with either
a zone sensor with status indication
lights or an Integrated Comfort
™
System.