Catalogue

UV-PRC004-EN 63
Mechanical Specifications
Outside Air/Return Air Damper
Each unit ventilator design results in a fixed air, compressible seal to ensure proper modulation and
mixing of the return and outdoor air. The damper is capable of varying proportion of mixed air from
100 percent room air to 100 percent outside air.
Face and Bypass Damper (option)
Face and bypass damper control is provided on the unit ventilator. This bypass damper design is
utilized for economizing and dehumidification of the equipment during seasonal or morning warm-
up. The damper is constructed of aluminum grade. The damper is tightly sealed and designed to
minimize heat pickup in the bypass position.
A coil isolation valve is a selectable option. It is a 2-position, 2-way valve with 24 Vac, 60 Hz
electrical, and a stroke time of 10 seconds ON/5 seconds OFF. Close off pressures include
30 psig - 1/2”, 15 psig - 3/4”, and 9 psig = 1”.
Controls
Controls options are: unit-mounted fan speed switch, customer supplied terminal interface (CSTI),
Tracer ZN520, and Tracer UC400. A variety of inputs and outputs are available for the CSTI and
Tracer controller options. A disconnect switch (for non-electric heat units), fused transformer,
contactor(s), and terminal strip are provided with the CSTI and Tracer controller options.
Customer Supplied Terminal Interface (CSTI)
The control interface is intended to be used with a field-supplied, low-voltage thermostat or
controller. The control box contains a relay board which includes a line voltage to 24-volt
transformer, and an optional disconnect switch. All end devices are wired to a low-voltage terminal
block and are run-tested, so the only a power connection and thermostat/controller connection is
needed to commission the unit. Changeover sensors and controls are provided whenever a
change-over coil is selected. When N.O. valves are selected, inverting relays are provided for use
with standard thermostats.
Unit-mounted Fan Speed Switch (FSS)
The fan speed switch is available with or without the control interface option. The unit-mounted
FSS will employ a low-voltage fan switch. The low-voltage fan speed option will provide an
interface to factory wiring, including variable speed/high-medium-low (HML) control. The control
box contains a line voltage to 24-volt transformer, EC motor controller, and an optional disconnect
switch.
Tracer ZN520
The Tracer ZN520 discrete speed controller can be used in a stand-alone application or used as part
of a Trane Integrated Comfort System (ICS) with LonTalk
®
communication. The Tracer ZN520 offers
the combined advantages of simple and dependable operation. Standard control features include
options normally available on more elaborate control systems. All control options are available
factory-mounted, -wired, and -configured and can also be field-configured using a service tool.
Tracer UC400
The Tracer UC400 controller delivers single zone VAV control in a stand-alone application or as part
of a Trane Integrated Comfort system with BACnet
®
communication. The Trace UC400 offers the
combined advantages of a factory-mounted, -wired, and -programmed controller for dependable
out-of-the box operation. Standard control features include options normally available on more
elaborate control systems. All control options are available factory-programmed with additional
configuration and programming in the field using a service tool.
Zone Sensors (option)
Trane offers a full line of wired and wireless temperature sensors. Wired temperature sensors are
the suitable alternative for locations that cannot accommodate wireless sensors or that require a
UV-PRC004-EN.book Page 63 Monday, February 4, 2013 11:01 AM