Trane VUV Installation, Operation And Maintenance Manual page 54

Installation - Electrical
Wall-Mounted Control Interconnection Wiring:
installer must provide interconnection wiring to connect wall-
mounted devices such as a fan mode switch or zone sensor
module. Refer to the unit wiring schematic for specific wiring
details and point-to-point wiring connections. Dashed lines
indicate field wiring on the unit wiring schematics. All
interconnection wiring must conform to NEC Class 2 wiring
requirements and any state and local requirements. Refer to
the following table for the wire size range and maximum wiring
distance for each device.
Table 16. Maximum wiring distances for low voltage
controls (ft)
Device
Fan Control Switch
Zone Sensor/Thermostat
Important: Do not bundle or run interconnection wiring in
parallel with or in the same conduit with any high-
voltage wires (110 V or greater). Exposure of
interconnection wiring to high voltage wiring,
inductive loads, or RF transmitters may cause
radio frequency interference (RFI). In addition,
improper separation may cause electrical noise
problems. Therefore, use shielded wire (Belden
83559/83562 or equivalent) in applications that
require a high degree of noise immunity. Connect
the shield to the chassis ground and tape at the
other end.
Note: Do not connect any sensor or input circuit to an
external ground connection.
Supply Power:
Power supply wiring is to be connected to
terminals 1 and 2 at the junction box in the left end pocket,
below the discharge air grille.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not designed
or qualified to accept other types of conductors.
Electric Heat
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized. Verify that
no power is present with a voltmeter.
54
Wire Size Range
14-22 AWG 500
16 - 22 AWG 200
Supply Power:
The
the following line terminals in the right-hand end pocket:
• 208V or 240V, 3-phase, 3-wire system: L1, L2, and L3.
• 480V, 3-phase, 4-wire system: L1, L2, L3, and N (neutral)
Equipment Damage!
480 V/3-Wire is NOT compatible with Trane Classroom
Unit Ventilator equipment. There must be a 4-wire
system with a separate ground. Failure to provide a 4-
wire system could result in equipment damage.
Note: The supply neutral wire must be connected to the
neutral terminal block.
Operational controls and an electric heating safety device are
factory mounted. The safety device is a high temp cutout which
de-energizes electric heating elements through the K1 safety
contactor.
DX Split System
A typical unit ventilator with DX coil includes an outside air
thermostat, a frost prevention thermostat, and a 24 V
transformer for condensing unit control.
Wire sizing is the same as given for the thermostat wiring in the
condensing unit installation instructions, or may be obtained
from the nameplate. The condensing unit must be controlled
by the same room thermostat that also controls the unit
ventilator.
Split System Start-Up
After all piping and wiring has been completed, follow the
instructions provided with the condensing unit for control
testing and system start-up. If sweat type field-piped systems
are being used, then pressure testing, evacuation, and
refrigerant charging will be required.
Two bulbs will also be shipped with a split system unit:
• Frostat® bulb
• TXV bulb (used with R - 410A)
Both components are to be field installed using the installation
kit shipped with the unit. For complete installation instructions
and locations, refer to the tag attached to the coil.
Supply power wiring is to be connected to
NOTICE
UV-SVX005G-EN