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4
Terminal Function Description
R Input Power Connection (24 Volt AC Heating
Transformer or Millivolt Power Source)
G Output Fan Control
W1 Output Conventional Heat Control
V3 Output Zone Valve Power Close
C Input 24 Volt AC Transformer Common
Connect Your Wires
3
Wiring Terminations
Heat Only or Millivolt
R Power Connection
W1 Heat Relay
G Fan Control [note 3]
C 24 Volt AC Transformer Common [note 2]
Typical Wiring Configurations
Conventional Systems
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