Trane Gas Unit Heaters Installation Manual download pdf (Page 24)

24 GHND-SVX01C-EN

Installation: Electrical

Electrical Connections

Standard units are shipped for use on 115 volt, 60 hertz

single phase electric power. The motor nameplate and

electrical rating of the transformer should be checked

before energizing the unit heater electrical system. All

external wiring must conform to the latest edition of ANSI/

NFPA No. 70 National Electrical Code and applicable local

codes; in Canada, to the Canadian Electrical Code, Part 1

CSA Standard C22.1.

It is recommended that the electrical power supply to each

unit heater be provided by a separate, fused, and

permanently live electrical circuit. A disconnect switch of

suitable electrical rating for each unit heater should be

located as close to the gas valve and controls as possible.

Each unit heater must be electrically grounded in

accordance with the latest edition of the National Electric

Code, ANSI/NFPA No. 70 or CSA Standard C22.1.

The transformer supplied with this unit heater is internally

fused. Any overload or short circuit will ruin the

transformer.

Thermostat Wiring and Location

Note: The thermostat must be mounted on a vertical,

vibration-free surface, free from air currents, and in

accordance with the furnished instructions.

Mount the thermostat approximately 5 feet (1.5 m) above

the floor in an area where it will be exposed to a free

circulation of average temperature air. Always refer to the

thermostat instructions as well as our unit wiring diagram,

and wire accordingly. Avoid mounting the thermostat in

the following locations:

1. Cold areas—Outside walls or areas where drafts may

affect the operation of the control.

2. Hot areas—Areas where the sun’s rays, radiation, or

warm air currents may affect control operation.

3. Dead areas—Areas where air cannot circulate freely,

suc

h as behind doors or in corners.

Note: Thermostat wires tagged “W” and “G” must be

connected together except when using a general

purpose “SPDT” 24 Vac relay and a standard

thermostat with subbase, or when using

Honeywell T834H or T834 thermostats. Also refer

to Figure 19, p. 24 for other wiring connections.

Thermostat Heat Anticipator Adjustments. The

initial heat anticipator setpoint should equal the

thermostat’s current amperage draw when the unit is

firing. This setpoint should be measured for the best

results. Use the recommended ranges as a guide. If further

information is needed, consult your thermostat

manufacturer’s instructions.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could result

in exposure to electrical, mechanical or other potential

safety hazards. Always refer to the safety warnings

provided throughout this manual concerning these

procedures. When possible, disconnect all electrical

power including remote disconnect and discharge all

energy storing devices such as capacitors before

servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized.

When necessary to work with live electrical

components, have a qualified licensed electrician or

other individual who has been trained in handling live

electrical components perform these tasks. Failure to

follow all of the recommended safety warnings

provided, could result in death or serious injury.

WARNING

Hazardous Voltage and Gas!

Turn off the gas supply and disconnect all electric

power, including remote disconnects before servicing

unit. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized

and the gas can not be inadvertently turned on. Failure

to turn off gas or disconnect power before servicing

could result in death or serious injury.

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. 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. Failure to

follow these requirements could result in death or

serious injury.

Figure 19. C1267G, thermostat wiring diagram

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Trane Gas Unit Heaters Installation Manual Page 24

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