26
Salus
A
PPENDIX
A
–
W
IRING
D
IAGRAMS
Terminal Definitions
Optima S Thermostat Terminal Reference
Terminal
Non-Heat Pump
Heat Pump
RJP
Power Jumper (RH)
RC
24 VAC for Cooling System or Jumper to RJP
RH
24 VAC for Heating System
24 VAC for Heat Pump
C
24 VAC Common Return
Y1
Single or 1
st
Stage Cooling
Single or 1
st
Stage Compressor
Y2
2
nd
Stage Cooling
2
nd
Stage Compressor
W1AX
Single or 1
st
Stage Heating
Auxiliary or Emergency Heat
W2OB
2
nd
Stage Heating
Changeover Valve
G
Fan Control
L
Not Used
System Monitor
ST898ZBR requires RH/RC and a C-wire and cannot operate on batteries.