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Loosen the terminal screws and slip each wire beneath
its matching terminal. See Fig. 2 for wiring insertion tech-
niques. Tighten terminals securely.
Plug the hole in the wall with insulation to help prevent
drafts from adversely affecting thermostat operation.
Fig. 2—Proper wiring technique.
PROPER WIRING TECHNIQUE
5/16 in.
(8 mm)
STRIP
Fig. 3—2-wire heat-only application (jumper
intact).
2-WIRE HEAT-ONLY (JUMPER INTACT)
A
B
HEATING
RELAY OR
VALVE COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 4—4-wire heat/cool application (jumper
intact).
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.
69-0889
INSERT
STRAIGHT
UNDER
SCREW HEAD
END OF WIRE
VISIBLE HERE
M3825
C
D
JUMPER
W
Y
G
Rc
R
L1
(HOT)
1
L2
M1709B
C
D
W
Y
G
JUMPER
Rc
R
FAN
L1
RELAY
(HOT)
L2
M1710B
Fig. 5—5-wire heat/cool application (jumper
removed).
5-WIRE HEAT/COOL (JUMPER REMOVED)
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
1
COIL
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 6—3-wire cool-only application (jumper
intact).
3-WIRE COOL-ONLY (JUMPER INTACT)
COOLING
CONTACTOR
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
ADJUST FAN OPERATION SWITCH, AS
REQUIRED
The thermostat fan operation switch, labeled FUEL
SWITCH (see Fig. 7), is factory-set in the F position. This
is the correct setting for most systems. If this system is an
electric heat system, set the switch to E. The E setting
allows the fan to turn on immediately with the heating or
cooling in a system where the G terminal is connected.
ADJUST BURNER ON-TIME, AS REQUIRED
The thermostat burner on-time is factory-set for a warm
air, gas or oil heating system. When installing it on another
type of system, adjust the burner on-time accordingly by
setting screws A and B on the back of the thermostat, using
the heating system table in Fig. 7 as a guide. To minimize
room temperature swings, optimize the on-time according
to the type of system (see Table 2). Adjusting the screw
"out one turn" means turning the screw approximately
360°, or about one complete turn.
2
A
C
B
D
W
Y
G
Rc
R
FAN
RELAY
L1
(HOT)
L2
M1711B
A
C
B
D
W
Y
G
JUMPER
Rc
R
FAN
RELAY
L1
(HOT)
L2
M848A
1
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