Loosen the screw on the heat terminal (typically marked ‘W’ or ‘W1’) and secure
one end of the resistor in the HVAC system’s Heat Relay Terminal by tightening the
terminal screw.
Connect the other end of the resistor to the 24V common return path. Two com-
pleted wiring examples are shown below.
4
5
Example 1. The first example (Figure 8) shows an HVAC system with a dedicated
24V Common screw terminal on the control board. The resistor simply spans be-
tween the Heat Relay Terminal (W) and the Common Terminal, providing a bypass
for some of the current that would otherwise pass through the heat relay circuit.
26
Figure 8. HVAC with Common Screw Terminal
Common Terminal
Bypass Resistor
Heat Relay
Terminal (W)
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