Access the 24V transformer and integrated control panel on the HVAC system. This typically
requires removing the front panel of the furnace. Remember to turn OFF the power to the
HVAC system before accessing the transformer.
Install the resistor on the HVAC system, not on the Thermostat. Wire the resistor from the
Heat Relay Terminal (W or W1) to the common side of the 24Volt HVAC system transformer.
Figure 7 shows the wiring diagram of a typical single-stage HVAC system with the resistor in
place.
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3
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Figure 6. Bypass Resistor
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