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RT-PRC007-EN42
Mechanical
Specifications
make all heating, cooling and/or
ventilating decisions in response to
electronic signals from sensors
measuring indoor and outdoor
temperatures. The control algorithm
maintains accurate temperature control,
minimizes drift from set point and
provides better building comfort. A
centralized microprocessor shall provide
anti-short cycle timing and time delay
between compressors to provide a
higher level of machine protection.
Control Options
Inlet Guide Vanes shall be installed on
each fan inlet to regulate capacity and
limit horsepower at lower system
requirements. When in any position
other than full open they shall pre-spin
intake air in the same direction as fan
rotation. The inlet guide vanes shall close
when supply fan is off, except in night
setback.
The inlet guide vane actuator motor shall
be driven by a modulating dc signal
from the unit microprocessor. A pressure
transducer shall measure duct static
pressure and modulate the inlet guide
vanes to maintain the required supply air
static pressure within a predetermined
range.
Variable Frequency Drives (VFDs)
VFDs shall be factory installed and tested
to provide supply fan motor speed
modulation. The VFD shall receive a 2-
10 VDC signal from the unit
microprocessor based upon supply
static pressure and shall cause the drive
to accelerate or decelerate as required to
maintain the supply static pressure
setpoint. When subjected to high
ambient return conditions the VFD shall
reduce its output frequency to maintain
operation. Bypass control to provide full
nominal air flow in the event of drive
failure shall be optional.
Ventilation Override
Ventilation Override shall allow a binary
input from the fire/life safety panel to
cause the unit to override standard
operation and assume one of two
factory preset ventilation sequences,
exhaust or pressurization. The two
sequences shall be selectable based
open a binary select input.
Outside Air
Manual Outside Air
A manually controllable outside air
damper shall be adjustable for up to 25
percent outside air. Manual damper is
set at desired position at unit start up.
Economizer
Economizer shall be factory installed. The
assembly includes: fully modulating 0-
100 percent motor and dampers,
minimum position setting, preset
linkage, wiring harness, and fixed dry
bulb control. Solid state enthalpy and
differential enthalpy control shall be a
factory or field installed option.
Exhaust Air
Barometric Relief
The barometric relief damper shall be
optional with the economizer. Option
shall provide a pressure operated
damper for the purpose of space
pressure equalization and be gravity
closing to prohibit entrance of outside air
during the equipment “off” cycle.
Power Exhaust Fan
Power exhaust shall be available on all
units and shall be factory installed. It
shall assist the barometric relief damper
in maintaining building pressurization.
Unit Options
Service Valves
Service valves shall be provided factory
installed and include suction, liquid, and
discharge 3-way shutoff valves.
Through-The-Base Electrical Provision
An electrical service entrance shall be
provided which allows access to route all
high and low voltage electrical wiring
inside the curb, through the bottom of
the outdoor section of the unit and into
the control box area.
Non-Fused Disconnect Switch
A factory installed non-fused disconnect
switch with external handle shall be
provided and shall satisfy NEC
requirements for a service disconnect.
The non-fused disconnect shall be
mounted inside the unit control box.
GFI Convenience Outlet (Factory
Powered)
A 15A, 115V Ground Fault Interrupter
convenience outlet shall be factory
installed. It shall be wired and powered
from a factory mounted transformer.
Unit mounted non-fused disconnect with
external handle shall be furnished with
factory powered outlet.
GFI Convenience Outlet (Field Powered)
A 15A, 115V Ground Fault Interrupter
convenience outlet shall be factory
installed and shall be powered by
customer provided 115V circuit.
Hinged Service Access
Filter access panel and supply fan access
panel shall be hinged for ease of unit
service.
Condenser Coil Guards
Factory installed condenser vinyl coated
wire mesh coil guards shall be available
to provide full area protection against
debris and vandalism.
LonTalk Communication Interface
Available either field or factory-installed
for constant volume units. When
installed on a constant volume unit, this
LonTalk board will allow the unit to
communicate as a Trane Comm5 device
or directly with generic LonTalk Network
Building Automation System Controls.
Stainless Steel Drain Pans
Sloped stainless steel evaporator coil
drain pans are durable, long-lasting and
highly corrosion resistant.
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 in
salt spray tests performed in accordance
with ASTM B117.