Wiring Diagrams; Schematic And Hookup Of T874A, B, C, D, E, F With Q674B. Used In Standard Applications; Schematic And Hookup Of T874C, D With Q674B. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES

WIRING DIAGRAMS

THERMOSTAT
H1
FALL
H1 ANTICIPATOR
H2
H2 ANTICIPATOR
FALL
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER RH, RC FOR SINGLE TRANSFORMER.
Fig. 44. Schematic and hookup of T874A,B,C,D,E,F with Q674B. Used in standard applications.
THERMOSTAT
H1
FALL
H1 ANTICIPATOR
H2
FALL H2 ANTICIPATOR
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
Fig. 45. Schematic and hookup of T874C,D with Q674B. Used in standard applications.
60-2485—8
SUBBASE
1
FAN
SWITCH
AUTO
ON
4
6
SYSTEM
SWITCH
8
HEAT
OFF
9
COOL
10
11
1
4
6
8
9
10
11
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER RH, RC FOR SINGLE TRANSFORMER.
RH
W1
W2
B
2
O
G
Y2
Y1
RC
SUBBASE
3
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
HEAT
OFF
COOL
3
OPTIONAL LED ON SOME MODELS.
96
SYSTEM COMPONENTS
L1
(HOT)
HEAT RELAY 1
L2
1
HEAT RELAY 2
HEAT CHANGEOVER
NOTE:
VALVE
Model
ing
No.
COOL CHANGEOVER T874A
VALVE
T874B
T874C
T874D
FAN RELAY
T874E
T874D
COMPRESSOR
CONTACTOR 2
COMPRESSOR
CONTACTOR 1
L2
L1
(HOT)
1
M2903
SYSTEM COMPONENTS
RH
HEAT RELAY 1
W1
HEAT RELAY 2
W2
HEAT CHANGEOVER
VALVE
B
X1
O
COOL CHANGEOVER
VALVE
G
FAN RELAY
2
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
RC
Heating Cool-
Bulbs Bulbs
H1 C1
H1 C1,C2
H1,H2 C1
H1,H2 C1,C2
C1,C2
H1,H2
L1
(HOT)
L2
1
L2
L1
(HOT)
1
M933C