Honeywell T874 - Schematic and Hookup of T874 A, D, F with Q674 D. Used Standard Applications; Schematic and Hookup of T874 A with Q674 B. Used in Standard Applications

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
107 60-2485—8
Fig. 65. Schematic and hookup of T874A with Q674B. Used in standard applications.
Fig. 66. Schematic and hookup of T874A,D,F with Q674D. Used in standard applications.
C1
RISE
L1
(HOT
)
L2
1
L1
(HOT)
L2
1
H1
FALL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M597
6
C1
ANTICIPATOR
H1 ANTICIPATOR
SYSTEM
SWITCH
HEAT
OFF
COOL
FAN
SWITCH
AUTO
ON
NO. 1 HEAT RELAY
HEAT DAMPER
COOL DAMPER
FAN RELAY
NO. 1 COMP. RELAY
FILTER
LED (RED)
SERVICE LED
(YELLOW)
X2
X1
Y1
Y2
G
RC
RH
B
W2
W1
1
4
6
8
9
10
11
O
THERMOSTAT SUBBASE SYSTEM COMPONENTS
W2
W1
M7011
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
Y2
RH
RC
Y1
H1 ANTICIPATOR
H2 ANTICIPATOR
H1
FALL
FALL
H2
1
4
5
6
8
9
10
11
NO FAN
SWITCH
NO SYSTEM
SWITCH
L1
(HOT
)
L2
1
L1
(HOT
)
L2
1
HEAT RELAY 1
HEAT RELAY 2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.