Schematic And Hookup Of T874C With Q674C. Used In Heat Pump Applications; Schematic And Hookup Of T874A, C, D With Q674E. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
FALL
H1
FALL
H2 ANTICIPATOR
H2
RISE
C1
C1 ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 81. Schematic and hookup of T874C with Q674C. Used in heat pump applications.
THERMOSTAT
FALL
H1
H1 ANTICIPATOR
H2 ANTICIPATOR
FALL
H2
RISE
C1
C1
ANTICIPATOR
C2 ANTICIPATOR
POWER SUPPLY. PROVIDE DISCONNECT
1
MEANS AND OVERLOAD PROTECTION
C2
AS REQUIRED.
RISE
2
JUMPER RC, RH FOR SINGLE TRANSFORMER.
3
O AND B TERMINALS ON SELECTED MODELS.
Fig. 82. Schematic and hookup of T874A,C,D with Q674E. Used in standard applications.
SUBBASE
1
4
FAN
SWITCH
AUTO
6
ON
8
SYSTEM
SWITCH
OFF
9
AUTO
10
SUBBASE
FAN
1
SWITCH
AUTO
ON
4
6
8
SYSTEM
SWITCH
OFF
9
HEAT
10
AUTO
COOL
11
115
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SYSTEM COMPONENTS
W1
B
G
R
W2
Y1
1
L1
(HOT)
RH
W1
2
HEAT RELAY 2
W2
O
3
B
G
Y2
COMPRESSOR
CONTACTOR 1
Y1
RC
CHANGEOVER
RELAY
FAN
RELAY
COMPRESSOR
CONTACTOR
L2
M5981
SYSTEM COMPONENTS
L1
(HOT)
HEAT RELAY 1
L2
1
FAN RELAY
COMPRESSOR
CONTACTOR 2
L2
1
L1
(HOT)
M934
60-2485—8