Schematic And Hookup Of T874A-D With Q674E. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
H1
H1
ANTICIPATOR
FALL
FALL
H2 ANTICIPATOR
H2
RISE
C1
C1
ANTICIPATOR
RISE
1
C2
Fig. 85. Schematic and hookup of T874A-D with Q674E. Used in standard applications.
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
FALL
H2
H2 ANTICIPATOR
C1 ANTICIPATOR
RISE
CO
C1
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 86. Schematic and hookup of T874G with Q674E. Used in heat pump applications.
1
FAN
4 SWITCH
AUTO
6
ON
8
SYSTEM
SWITCH
OFF
9
HEAT
AUTO
COOL
10
C2 ANTICIPATOR
11
POWER SUPPLY. PROVIDE DISCONECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
SUBBASE
1
2
FAN
SWITCH
AUTO
ON
3
5
6
8
SYSTEM
SWITCH
OFF
HEAT
9
AUTO
10
COOL
117
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
W1
COMPRESSOR
CONTACTOR 1
Y1
G
R
W2
Y2
R
M
HIGH
PRESSURE
SWITCH
F
V
Y
DEFROST RELAY
CONTACT
VR
SYSTEM COMPONENTS
HEAT RELAY 1
FAN RELAY
L1
(HOT)
L2 1
HEAT RELAY 2
COMPRESSOR
CONTACTOR 2
M5983
SYSTEM COMPONENTS
L1
(HOT)
1
L2
COOL
CHANGEOVER
D. F. O.
VALVE
DEFROST
DEFROST
RELAY
SWITCH
COMPRESSOR
CONTACTOR
FAN RELAY
DEFROST RELAY
AUX. HT. RELAY
CONTACT
1
M4667
L2
L1
(HOT)
60-2485—8