26
ELECTRICAL WIRING
WARNING:
EXPLOSION HAZARD
• Electricalconnectionsmustbeincompliancewithall
applicable local codes with the current revision of the
National Electric Code (ANSI/NFPA 70).
• For Canadian installations theelectrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
IMPORTANT NOTE:
27).
Line Voltage Wiring
It is recommended that the line voltage (115 VAC) to
the furnace be supplied from a dedicated branch circuit
containing the correct fuse or circuit breaker for the furnace
as listed in Table 5 (page 27).
The installer should become familiar with the units wiring
diagram before making any electrical connections to the
unit. See Figure 33 (page 40), Figure 34 (page 41), or
the unit wiring label.
IMPORTANT NOTES:
See
27)
Figure 27.
Grounding
WARNING:
• Thefurnaceisdesignedtobecontrolledbya24VAC
thermostat. The thermostat’s wiring must comply with
the current provisions of the NEC (ANSI/NFPA 70) and
with applicable local codes having jurisdiction.
• The thermostat must be installed according to the
instructions supplied by the thermostat manufacturer.
Low voltage connections (24 VAC) from the thermostat
are wired to the terminal strip on the integrated control
in the furnace. Figure 28 (page 28) contains the proper
connections for heating only (two-wire) and heating/
cooling (four-wire) applications. Recommended
minimum wire gauge for thermostat wiring is shown in
Table 5 (page 27).
• The thermostat should be mounted about 5 feet
above the floor on an inside wall. DO NOT install the
thermostat on an outside wall or any other location
where its operation may be adversely affected by
radiant heat from fireplaces, sunlight, or lighting
fixtures, and convective heat from warm air registers
or electrical appliances. Refer to the thermostat
manufacturer’s instruction sheet for detailed mounting
information.
• Thesixpinterminalmarked“ExpansionPort”(Figure
28
) is not used in the single stage furnace as shipped
from the factory. It is used for the furnace control board
to communicate to a fixed speed or variable speed
high efficiency motor that may be optionally installed.
Please contact your distributor for the proper upgrade
motor kit.
Set the heat anticipator according to the instructions
supplied by the thermostat manufacturer. To determine
the heat anticipator setting:
1. Add the current draw of the system components; or
2. Measure the current flow on the thermostat R-W circuit
after the circulating blower motor has started.
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