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1. Installation of wiring must conform with local building codes. In the absence of local codes, installation
must conform to the National Electric Code ANSI/NFPA 70-Latest Edition. Unit must be electrically
grounded in conformance with this code. In Canada, wiring must comply with CSA C22.1, Canadian
Electrical Code.
2. All furnaces are provided with a wiring diagram located on the inside of the access panel. Refer to this
wiring diagram for all wiring connections.
3. The combustion blower motor will not run unless the furnace is turned on and the gas controls are calling
for heat.
WARNING!!!
• Disconnect power supply before making wiring connections to prevent electrical shock and
equipment damage.
• All appliances must be wired strictly in accordance with wiring diagram furnished with the unit. Any
wiring different from the diagram could result in a hazard to persons and property.
• Any original factory wiring that requires replacement must be replaced with wiring material having a
temperature rating of at least 105°C.
1. Two-stage temperature controls - Controls the
furnace stages based on the unit discharge
temperature.
2. Combustion blower - Exhausts the products of
combustion from the furnace tubes.
3. Ignition controller - Continually monitors,
analyzes, and controls the proper operation of
the gas burner.
4. Manifold pressure test port - Used for checking
the manifold gas pressure.
5. Time Delay relay - Allows burner to stay at high
fire for 10 seconds upon being lit.
6. Air pressure switch - Tests to ensure the
combustion blower is operating.
7. Two-stage gas valve - Contains main pressure
regulator, safety shut-off valves, and manual
shut off knob. It controls the furnace to 50% or
100% fire.
8. Ignitor - Provides spark for burner ignition.
9. Flame Sensor - Ensures that each burner has
ignited.
Control Center Layout
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Electrical Connections
Figure 2: Furnace Control Center
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