Schematic And Hookup Of T874G, H With Q674C. Used In Standard Applications; Schematic And Hookup Of T874D With Q674E. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2
FALL
3
CO
C1
RISE
ANTICIPATOR
RISE
C1
Fig. 79. Schematic and hookup of T874G,H with Q674C. Used in standard applications.
THERMOSTAT
FALL
H1
H1 ANTICIPATOR
H2 ANTICIPATOR
H2
FALL
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
RISE
OPTIONAL FIELDWIRE JUMPER TO ALLOW SINGLE SYSTEM TRANSFORMER.
2
Fig. 80. Schematic and hookup of T874D with Q674E. Used in standard applications.
60-2485—8
FAN
1
SWITCH
AUTO
4
6
8
9
SYSTEM
SWITCH
10
AUTO
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
SETBACK CONTACT ON Q674C1124.
1
FAN SWITCH
AUTO
4
ON
6
SYSTEM
OFF
SWITCH
HEAT
8
AUTO
9
COOL
10
11
SUBBASE
RESET
LED (RED)
ON
OFF
SUBBASE
W1
Y1
RC
W2
RH
C
SERVICE
LED (RED)
Y2
114
SYSTEM COMPONENTS
RESET
X
G
FAN RELAY
R1
SETBACK
2
CONTACT
R2
COOL
CHANGEOVER
VALVE
O
COMPRESSOR
CONTACTOR
Y
3 H2 ON T874G.
SYSTEM COMPONENTS
HEAT
CONTACTOR
RELAY 1
COMPRESSOR 1
G
FAN RELAY
HEAT RELAY 2
2
Z
COMPRESSOR
COMPRESSOR
FAULT
CONTACTOR 2
M5997
L1
(HOT)
L2
1
M7027
L1
(HOT)
L2
1