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42 UV-SVN03F-EN

Installation—Electrical

Wiring

Motor data can be found in Table 5, p. 11.

Control Power. Unit ventilator controls and control

wiring can be factory mounted or field installed.

Wiring diagrams illustrate the standard unit motors with

one or more speed controls. Terminal wiring is provided

by Trane and the actual components used for a particular

installation may differ. Control and line diagrams for the

exact control system used are provided with each unit.

Electrical Wiring

Unit Wiring Diagrams. Specific unit wiring diagrams,

based on unit options ordered, are provided inside each

unit and can be easily removed for reference. Use these

diagrams for connections or trouble analysis. Wiring

diagrams are attached on the inside of the front panel of

the unit.

Supply Power Wiring. Refer to the unit nameplate to

obtain the minimum circuit ampacity (MCA) and

maximum fuse size (MFS) or maximum circuit breaker

(MCB) to properly size field supply wiring and fuses or

circuit breakers. Refer to the unit operating voltage listed

on the unit wiring schematic, submittal, or nameplate.

Reference the wiring schematic for specific wiring

connections.

Note: All field wiring should conform to NEC and all

applicable state and local code requirements. The

control panel box is always on the end opposite the

piping connections. Access the control box by

removing the two screws that secure the front

cover. This will allow the panel to be removed, to

provide access to the electrical components.

If the unit does not have a disconnect switch, the power

leads and capped ground wire are inside the control panel.

If the unit has a disconnect switch, the power leads are

wired to the junction box switch on the control panel. Pull

the capped ground wire into the junction box.

Electrical Grounding Restrictions. All sensor and

input circuits are normally at or near ground (common)

potential. When wiring sensors and other input devices to

the Tracer controller, avoid creating ground loops with

grounded conductors external to the unit control circuit.

Ground loops can affect the measurement accuracy of the

controller.

All input/output circuits (except isolated relay contacts and

optically isolated inputs) assume a grounded source,

either a ground wire at the supply transformer to control

panel chassis, or an installer supplied ground.

Wall-Mounted Control Interconnection Wiring. The

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

WARNING

Electrocution and Fire Hazards with

Improperly Installed and Grounded Field

Wiring!

Improperly installed and grounded field wiring poses

FIRE & ELECTROCUTION hazards. To avoid these

hazards, you MUST follow requirements for field wiring

installation and grounding as described in NEC and

your local/state electrical codes. All field wiring MUST

be performed by qualified personnel.

Failure to follow these requirements could result in

death or serious injury.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote

disconnects before servicing. Follow proper lockout/

tagout procedures to ensure the power can not be

inadvertently energized. Failure to disconnect power

before servicing could result in death or serious injury.

NOTICE:

Equipment Damage!

Wiring diagrams provided in this manual are for

reference only. Actual wiring for particular options/

units could vary. Refer to the diagram provided on the

equipment for specific information. Failure to follow

recommendations above could result in premature

motor failures or equipment damage.

Do not remove or alter the wiring of the time delay

relay (DL). Failure to do so could result in equipment

failure.

WARNING

Fire Hazard!

When installing field provided controls, do not alter or

remove any built-in unit safeties. Tampering with unit

safeties could cause unit overheating and possible fire

hazard which could result in death or serious injury.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types

of conductors. Failure to use copper conductors could

result in equipment damage.

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