46
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.
Phase Monitor
Phase monitor shall provide 100%
protection for motors and compressors
against problems caused by phase loss,
phase imbalance, and phase reversal.
Phase monitor is equipped with an LED
that provides an ON or FAULT indicator.
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.
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.
Mechanical
Specifications
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.
High Pressure Cutout
Standard on all units.
Hinged Access Doors
Sheet metal hinges are available factory-
installed on the Filter/Evaporator, Supply
Fan/Heat, and the Compressor/Control
Access Doors.
Black Epoxy Coated Condenser Coil
The coil provides corrosion protection to
condenser coils for seacoast application.
The protection is a factory-applied
thermoset vinyl coating, bonded to
normal aluminum fin stock. The uniform
thickness of the bonded vinyl layer
exhibits excellent corrosion protection.
