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4-WIRE HEAT/COOL (JUMPER INTACT)
A
B
HEATING
COOLING
RELAY OR
CONTACTOR
VALVE COIL
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. 4-wire heat/cool application (jumper intact).
5-WIRE HEAT/COOL (JUMPER REMOVED)
A
B
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
1
COIL
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 8. 5-wire heat/cool application (jumper removed).
Adjust Fan Operation Switch, as Required
The thermostat fan operation switch, labeled FUEL SWITCH
(see Fig. 9) is factory set in the F position. This is the correct
setting for most systems. If you have an electric heat system,
set the switch to E. In systems with the G terminal connected,
the E setting turns on the fan immediately with heating or
cooling.
C
D
W
Y
G
JUMPER
Rc
R
FAN
RELAY
L1
(HOT)
L2
M1710B
C
D
W
Y
G
Rc
R
FAN
RELAY
1
L1
(HOT)
L2
M1711B
T8112 PROGRAMMABLE THERMOSTAT
THERMOSTAT BACK
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)
ADJUST:
SCREW A–OUT 1 TURN
SCREW B–IN
FUEL SWITCH – F POSITION
FUEL SWITCH
F
Fig. 9. Back view of thermostat.
Adjust System On-Time as Required
The thermostat on-time is factory set for a warm air, gas or oil
heating system. If you are installing it on another type of
system, the system on-time must be adjusted by changing
the setting of screws A and B on the back of the thermostat.
Use the heating system table in Fig. 9 as a guide to minimize
room temperature swings. The system on-time should be
optimized according to the type of system. Setting the screw
out one turn means turning the screw approximately 360°, or
one complete turn.
NOTE: This thermostat does not have a setting for steam/
gravity air. Cycles would not be long enough for
accurate temperature control.
NOTE: For condensing furnaces, follow manufacturer
instructions.
IMPORTANT
When using a high efficiency furnace such as a
90 percent or greater AFUE (Average Fuel Utilization
Efficiency) unit, adjust screw A out one turn and
screw B In one turn.
If you want a longer on-time, readjust screws A and B as
follows (refer to Table 1 Compatibility Chart):
•
Warm Air Furnace—set at the Hot Water setting (A—out
one turn, B—in).
•
Electric Furnace—leave at the Warm Air Furnace setting
(A—in, B—in).
NOTE: This thermostat does not have a setting for steam/
gravity air. Cycles would not be long enough for
accurate temperature control.
Install Batteries
IMPORTANT
Batteries must be installed for programming and
operating the thermostat and heating/cooling
system.
5
A
C
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
FUEL SWITCH
HEATING SYSTEM
POSITION
WARM AIR
A–IN
B–IN
B
D
F
FURNACE
A–OUT
HOT WATER
F
B–IN
BOILER
1 TURN
ELECTRIC
B–OUT
A–IN
E
FURNACE
1 TURN
W
Y
G
E
Rc
R
M3669
68-0170
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