Appendix A - Wiring Diagrams - Salus ST921WF Installation Manual

Appendix A - Wiring Diagrams

ST921WF Thermostat Terminal Reference
Terminal Non-Heat Pump Heat Pump
RC 24 VAC Power – Cool
RH 24 VAC Power – Heat
24 VAC Common
C
(Use SA918 Wire Extender if C-wire is not available)
G Fan
Y1 Cooling Compressor
Not Used Not Used
W1/OB Heating Reversing Valve
Auxiliary Emergency Heat
L Not Used Check/Fault Input
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