Honeywell T8424C 7 68-0180-3

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