Schematic And Hookup Of T874W With Q674B. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
H1
ANTICIPATOR
H1
FALL
H2
FALL H2 ANTICIPATOR
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 53. Schematic and hookup of T874D with Q674B. Used in standard applications.
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
FALL
H3
H3 ANTICIPATOR
FALL
H2
RESET HEATER
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
RISE
C2
POWER SUPPLY. PROVIDE DISCONNECT
1
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
Fig. 54. Schematic and hookup of T874W with Q674B. Used in standard applications.
SUBBASE
1
FAN SWITCH
AUTO
ON
4
6
SYSTEM
SWITCH
8
HEAT
OFF
9
COOL
10
11
1
2
FAN SWITCH
3
AUTO
4
ON
5
SYSTEM
SWITCH
6
HEAT
OFF
8
COOL
10
11
101
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
R
C815A THERMISTOR
T
W1
W2
HEAT RELAY 2
W3
B
HEAT CHANGEOVER VALVE
G
O
COOL CHANGEOVER VALVE
Y2
COMPRESSOR CONTACTOR 2
Y1
COMPRESSOR CONTACTOR 1
SYSTEM COMPONENTS
HEAT RELAY 1
W1
HEAT RELAY 2
W2
R
1
G
FAN RELAY
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1 M3202A
SYSTEM COMPONENTS
1
L1 (HOT)
L2
HEAT RELAY 1
HEAT RELAY 3
FAN RELAY
M3674
L1
(HOT)
L2
60-2485—8