Schematic And Hookup Of T874A-F, Q With Q674G. Used In Standard Applications; Schematic And Hookup Of T874C, D With Q674G. Used Heat Pump Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1
ANTICIPATOR
H1
FALL
H2
FALL
H2 ANTICIPATOR
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
Fig. 91. Schematic and hookup of T874A-F,Q with Q674G. Used in standard applications.
THERMOSTAT
H1 ANTICIPATOR
3
FALL
H1
H2 ANTICIPATOR
FALL
H2
C1
C1 ANTICIPATOR
RISE
Fig. 92. Schematic and hookup of T874C with Q674G. Used in heat pump applications.
60-2485—8
1
4
6
8
9
10
11
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER RH, RC FOR SINGLE TRANSFORMER.
1
NO FAN
SWITCH
4
6
SYSTEM
SWITCH
8
9 AUTO
10
SUBBASE
NO FAN
SWITCH
SYSTEM
SWITCH
OFF
AUTO
SUBBASE
OFF
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
120
SYSTEM COMPONENTS
RH
HEAT RELAY 1
W1
HEAT RELAY 2
W2
B
HEAT DAMPER
O
COOL DAMPER
2
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
RC
1
SYSTEM COMPONENTS
W1
CHANGEOVER
RELAY
B
W2
FAN RELAY
G
Y1
COMPRESSOR
CONTACTOR
R
L1
(HOT)
L2
1
L2
L1
(HOT)
M3201B
1
L2
L1
(HOT)
M6008A