Schematic And Hookup Of T874A, B, D With Q674B. Used In Standard Applications; Schematic And Hookup Of T874R With Q674B. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
H1
FALL
H1 ANTICIPATOR
H2
H2 ANTICIPATOR
FALL
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
Fig. 46. Schematic and hookup of T874A,B,D with Q674B. Used in standard applications.
.
THERMOSTAT
H1
C1
FALL
H2
FALL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 47. Schematic and hookup of T874R with Q674B. Used in heat pump applications.
1
4
6
8
9
10
11
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
1
H1/C1
ANTICIPATOR
2
3
4
5
6
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
HEAT
OFF
COOL
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
HEAT
OFF
COOL
97
SYSTEM COMPONENTS
HEAT RELAY 1
W1
HEAT RELAY 2
W2
HEAT CHANGEOVER
VALVE
B
R
O
COOL
CHANGEOVER
VALVE
G
FAN RELAY
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
SYSTEM COMPONENTS
O
COOL CHANGEOVER
VALVE
G
FAN RELAY
R
W1
AUX. HT.
RELAY
Y
COMPRESSOR
M2906
CONTACTOR
L1
(HOT)
L2
1
M2904
L1
(HOT)
L2
1
60-2485—8