Schematic And Hookup Of T874V With Q674R. Used In Fan Coil Applications; Schematic And Hookup Of T874C With Q674S. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
RISE
8
C1
9
10
C1 ANTICIPATOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 69. Schematic and hookup of T874V with Q674R. Used in fan coil applications.
THERMOSTAT
1
H1 FALL
4
6
H2
FALL
8
9
1 POWER SUPPLY. PROVIDE DISCONNECT
H1
MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FALL
Fig. 70. Schematic and hookup of T874C with Q674S. Used in heat pump applications.
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
FAN SWITCH
LO
AUTO
HI
CONT.
SYSTEM SWITCH
OFF
COOL
SUBBASE
SERVICE
NO FAN
LED (RED)
SWITCH
SYSTEM
SWITCH
HEAT
COOL
109
SYSTEM COMPONENTS
Z
G
R
Y
SYSTEM COMPONENTS
S
COMPRESSOR
FAULT
W2
AUX. HT. RELAY
R
Y
COMPRESSOR
CONTACTOR
Z RELAY
FAN RELAY
L1
(HOT)
1
L2
COOL RELAY
M107A
1
L2
L1
(HOT)
M1402A
60-2485—8