Honeywell T8700B, T8700C, T8700C1005 Fig. 9. T8700B1007 Heat Only wiring diagram in electric baseboard or ceiling cable system., Fig. 10. T8700B1007 Heat Only wiring diagram for controlling 2-wire hot water zone valves., Fig. 11. T8700B1007 Heat Only diagram used with TACO zone valves. The 7870 OHM resistor is included.

T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT
68-0197—1
5
Fig. 7. T8700C heat-cool wiring diagram in single trans-
former system with gas or electric heat/electric cooling.
Fig. 9. T8700B1007 Heat Only wiring diagram in
electric baseboard or ceiling cable system.
Fig. 8. T8700C heat-cool wiring diagram
in oil heating/electric cooling system.
(Oil primary has its own transformer.)
Fig. 10. T8700B1007 Heat Only wiring diagram
for controlling 2-wire hot water zone valves.
Fig. 11. T8700B1007 Heat Only diagram used with TACO
zone valves. The 7870 OHM resistor is included.
L1
(HOT)
L1
(HOT)
L2
L2
1
1
1
W
Y
G
R
COOLING
CONTACTOR
FAN
RELAY
OIL PRIMARY
CONTROL
TT
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED. M12526
T8700
M12623
L1
(HOT)
L2
1
1
2
2
3
2 2
3 3 3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONNECT V8043E YELLOW LEADWIRE TO THERMOSTAT.
CONNECT V8043E RED LEADWIRES TO AQUASTAT®.
T8700T8700T8700
V8043E
CIRCULATOR
T
RWRWRW
T
1
2C1
TO
BURNER
CONTROL
CIRCUIT
B1
B2
C2
V8043EV8043E
1
2
3
RESISTOR
L1
(HOT)
L2
1
1
THERMOSTAT T8700B
RW
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONNECT 7870 OHM RESISTOR TO THE TACO ZONE
VALVE TERMINALS 1 AND 2. (TO ORDER, USE PART
NO. 4074EYC.)
TACO ZONE VALVE
M13178
2
2
L1
(HOT)
L2
1
1
W
Y
G
R
COOLING
CONTACTOR
FAN
RELAY
HEATING
PRIMARY
CONTROL
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED. M13207
T8700
L1
(HOT)
L2
1
W
R
1POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED. M12527B
RESISTANCE
HEATER
SWITCH
HEATER
BLACK
BLUE
RED
RED
WHITE
R841C
BIMETAL
SWITCH
T8700