Honeywell T8400C Product Data page 7

4
2
R8239A1052
C Y
L2
1
L1
(HOT)
ZONE 1
VALVE OR
DAMPER
MOTOR
Fig. 13. T8400C/T8401C heat only wiring diagram for controlling incompatible or 3-wire zone valves or dampers. Heating
equipment is operated by end switch on the zone valve or motor, or by thermostat in master zone.
D892/M892
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
REMOVE PLUG-IN THAT JUMPERS PINS 2 AND 3 WHEN USING VENT
2
DAMPER.
3 AFTER VENT DAMPER IS PLUGGED INTO L8148E1265, FUSE BLOWS
WHEN THERMOSTAT FIRST CLOSES. AFTER FUSE BLOWS, L8148E1265
OPERATES ONLY WHEN VENT DAMPER IS CONNECTED.
4 SEE VENT DAMPER PRODUCT SPECIFICATIONS FOR INTERNAL
SCHEMATICS.
5 B1 IS 1/4 IN. TAB TERMINAL.
IN T8401C INSTALLATIONS, CONNECT C TERMINAL.
6
Fig. 14. T8400C/T8401C heat only wiring diagram with L8148E1265 (with internal plug) wired
ZONE 1
T8400C, T8401C
R
C W
4
R8222B1067
W R G
3
ZONE 2
VALVE OR
DAMPER
MOTOR
3
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 USE ONE R8239 FOR EVERY FOUR ZONES.
4 197516A
CABLE
4
3
2
1
POLARIZED 4-PRONG
MALE MOLEX PLUG AND
4-PRONG FEMALE
MATING PLUG ON CABLE
directly to vent damper in hydronic intermittent pilot system.
T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS
ZONE 2 ZONE 3
T8400C, T8401C T8400C, T8401C
R
C W C
4
R8222B1067
3
ZONE 3
VALVE OR
DAMPER
MOTOR
T8400C, T8401C
W
Y
G
R
6
C
L8148E1265
4
2
2
3
FUSE
3
5
1
6-PRONG FEMALE MOLEX
B1
RECEPTABLE IN L8148E
AND 5-PRONG MALE
5
MOLEX PLUG ON CABLE
24V GND
24V
7
ZONE 4
T8400C, T8401C
R
W C
4
R8222B1067
3
ZONE 4
VALVE OR
DAMPER
MOTOR
3
USE FOR 3-WIRE ZONE VALVE OR DAMPER.
4 IN T8401C INSTALLATIONS, CONNECT C TERMINAL.
TV T
W
1K
Z
HIGH LIMIT
CONTROLLER
R
1K2
B
C1
C2
1K1
B2
L1 L2
CIRCULATOR
1
L1
L2
(HOT)
S8610
M10286
R
W
M10285A
68-0180-3