Honeywell T8131A Owner's Manual page 21

• Electric Furnace—leave at the
Warm Air Furnace setting (A—
leave in, B—out one turn).
NOTE: This thermostat does not
have a setting for steam/
gravity air. Cycles would
not be long enough for
accurate temperature
control.
IMPORTANT
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
leave screw B in.
THERMOSTAT BACK
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)
ADJUST: SCREW A–OUT ONE TURN
SCREW B–IN
FUEL SWITCH – F POSITION
FUEL SWITCH
F
21
A
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
HEATING SYSTEM
B WARM AIR A–IN
FURNACE
HOT WATER A–OUT
BOILER 1 TURN
ELECTRIC A–IN
FURNACE
W Y
E
C
FUEL SWITCH
POSITION
B–IN F
F
B–IN
B–OUT E
1 TURN
G
R
M9199
69-0887—1