GUNE-SVX001A-EN
25
Electrical Connections
Standard units are shipped for use on 115-volt, 60-hertz,
single phase electric power. The duct furnace data plate
and electrical rating of the transformer should be checked
before energizing the duct furnace electrical system. All
external wiring must conform to the latest edition of
ANSI/NFPA No. 70, United States 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
duct furnace be provided by a separate, fused, and
permanently live electrical circuit. A disconnect switch of
suitable electrical rating should be located as close to the
gas valve and controls as possible. Each duct furnace must
be electrically grounded in accordance with the latest
edition of the United States National Electrical Code,
ANSI/NFPA No. 70, or CSA Standard C22.1. Refer to
through
.
Thermostat Wiring and Location
Important:
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 the duct furnace 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 the operation of the
control.
3. Dead Areas—Areas where the air cannot circulate
freely, such as behind doors or in corners.
Note:
The start-up fan delay should not exceed
30 seconds from a cold start.
Important:
For all wiring connections, refer to the
wiring diagram shipped with your unit
(either affixed to the inside of the control
access panel or enclosed in the installation
instructions envelope). Should any original
wire supplied with the unit have to be
replaced including high limit wires, it must
be replaced with wiring material having a
temperature rating of at least 221°F (105°C).
Standard single stage and optional two stage wiring
diagrams are included in this manual. Duct furnaces
equipped with modulating gas controls and other optional
equipment will be shipped with a unit-specific wiring
diagram.
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.
WARNING
Use Voltmeter Across Terminals to Check
for Power!
Do not use any tools (i.e., screwdriver, pliers, etc.)
across terminals to check for power. Use a voltmeter.
Failure to do so could result in death or serious injury,
and property damage.
Figure 18.
Low-voltage thermostat wiring, single-stage
Figure 19.
Low-voltage thermostat wiring, two-stage
Figure 20.
Low-voltage T834H or T834N (or equivalent)
thermostat wiring, single-stage
