Schematic And Hookup Of T874B, D With Q674G. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
H2
FALL
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
Fig. 89. Schematic and hookup of T874D with Q674E. Used in standard applications.
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
FALL
H2
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 90. Schematic and hookup of T874D with Q674G. Used in standard applications.
SUBBASE
1
AUTO
FAN
SWITCH
ON
4
6
SYSTEM
8 SWITCH
OFF
HEAT
9
AUTO
10 COOL
11
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
SUBBASE
1
4
NO FAN
SWITCH
5
6
7
8 SYSTEM
SWITCH
OFF
AUTO
9
10
11
12
119
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
B
W1
Y1
G
RC
W2
RH
FILTER
LED (YEL)
X
SERVICE
LED (RED)
A
Y2
O
FILTER LED (YEL)
X2
SERVICE
LED (RED)
A2
W1
FILTER
LED (YEL)
X1
SERVICE
LED (RED)
A1
W2
RC
RH
Y2
Y1
SYSTEM COMPONENTS
HEAT
RELAY 1 HEAT CHANGEOVER
VALVE
COMPRESSOR
CONTACTOR 1
FAN RELAY
L1
(HOT)
HEAT RELAY 2
L2
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 2
COOL CHANGEOVER
VALVE
M7023
SYSTEM COMPONENTS
HEAT RELAY 1
T RELAY
HEAT RELAY 2
T
L1
(HOT)
HEAT
L2
CHANGEOVER
VALVE
B
L1
(HOT)
COOL
L2
CHANGEOVER
VALVE
O COMPRESSOR
CONTACTOR 2
COMPRESSOR
CONTACTOR 1
M7022
60-2485—8
1
1
1
1