Schematic And Hookup Of T874D With Q674B. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
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 CLOGGED FILTER, SERVICE SWITCH.
Fig. 48. Schematic and hookup of T874D with Q674B. Used in standard applications.
60-2485—8
SUBBASE
1
FAN
SWITCH
AUTO
ON
4
6
8
SYSTEM
SWITCH
9
HEAT
OFF
10
COOL
11
98
SYSTEM COMPONENTS
HEAT RELAY 1
W1
FAN RELAY
G
EXTERNAL
FAN SWITCH
RC
HEAT RELAY 2
W2
HEAT CHANGEOVER
VALVE
B
RH
2
X1
FILTER
LED (RED)
O
COOL CHANGEOVER
VALVE
Y1
COMPRESSOR
CONTACTOR 1
Y2
COMPRESSOR
CONTACTOR 2
L1
(HOT)
L2
1
L2
L1
(HOT)
1
M2905