Schematic And Hookup Of T874B, D With Q674E. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
FALL
H1
H1 ANTICIPATOR
H2 ANTICIPATOR
FALL
H2
RISE
C1
C1 ANTICIPATOR
RISE
C2 ANTICIPATOR
C2
Fig. 87. Schematic and hookup of T874D with Q674E. Used in standard applications.
THERMOSTAT
H1
ANTICIPATOR
FALL
H1
FALL
H2 ANTICIPATOR
H2
RISE
C1
C1 ANTICIPATOR
RISE
C2 ANTICIPATOR
C2
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 88. Schematic and hookup of T874B,D with Q674E. Used in standard applications.
60-2485—8
SUBBASE
1
FAN
SWITCH
AUTO
ON
4
6
SYSTEM
SWITCH
OFF
8
HEAT
AUTO
9
COOL
10
11
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FIELDWIRE JUMPER TO ALLOW SINGLE SYSTEM TRANSFORMER.
2
SUBBASE
1
FAN
SWITCH
AUTO
ON
4
6
SYSTEM
SWITCH
OFF
8
HEAT
AUTO
9
COOL
10
11
118
W1
HEAT RELAY 1
Y1
G
FAN RELAY
RC
W2
B
2
RH
X
SYSTEM
FAULT CONTACT
C
LOCKOUT LED
(RED)
Y2
W1
G
FAN RELAY
RC
W2
HEAT RELAY 2
RH
X
HIGH LED (RED)
Y2
COMPRESSOR
CONTACTOR 2
LOW LED (GREEN)
Y1
SYSTEM COMPONENTS
COMPRESSOR
CONTACTOR 1
L1
(HOT)
1
L2
HEAT RELAY 2
L2
1
L1
(HOT)
COMPRESSOR
CONTACTOR 2
M4668
SYSTEM COMPONENTS
HEAT RELAY 1
1
L1
(HOT)
L2
L2
1
L1
(HOT)
COMPRESSOR
CONTACTOR 1
M4669