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NOTE: This thermostat does not have a setting for steam/gravity air. Cycles would not be long
enough for accurate temperature control.
When using a high efficiency furnace such as a 90% or greater AFUE (Average Fuel Utilization
Efficiency) unit, adjust screw A out one turn and screw B in.
IMPORTANT
THERMOSTAT BACK
DISPLAY °F
C–IN
DISPLAY °C
C–OUT
1 TURN
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)
ADJUST: SCREW A–OUT 1 TURN
SCREW B–IN
FUEL SWITCH – F POSITION
FUEL SWITCH
F
A
C
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
HEATING SYSTEM
WARM AIR
A–IN
B–IN
B
D
FURNACE
HOT WATER
A–OUT
B–IN
BOILER
1 TURN
ELECTRIC
A–IN
B–OUT
FURNACE
1 TURN
W
Y
G
E
R
17
FUEL SWITCH
POSITION
F
F
E
Rc
INSTALLATION
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