Schematic And Hookup Of T874C With Q674B. Used In Standard Applications; Schematic And Hookup Of T874G With Q674B. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
H1
ANTICIPATOR
H2
FALL
H2 ANTICIPATOR
FALL
H1
C1 ANTICIPATOR
C1
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 49. Schematic and hookup of T874C with Q674B. Used in standard applications.
THERMOSTAT
H1
ANTICIPATOR
FALL
H1
FALL
H2 ANTICIPATOR
H2
CO
RISE
C1 ANTICIPATOR
C1 RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 50. Schematic and hookup of T874G with Q674B. Used in heat pump applications.
SUBBASE
1
FAN SWITCH
AUTO
4
ON
6
SYSTEM
8
SWITCH
HEAT
9
OFF
COOL
10
1
2
4
6
SYSTEM
SWITCH
8
9
10
99
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
W1
HEAT
LED (RED)
G
W2
COOL LED
(YELLOW)
Y1
LO SPEED
LED (GREEN)
HI SPEED
LED (GREEN
SUBBASE
FAN
SWITCH
AUTO
ON
HEAT
OFF
COOL
SYSTEM COMPONENTS
HEAT RELAY 1
BLOWER RELAY
L1
R
(HOT)
L2
HEAT RELAY 2
T
COMPRESSOR
CONTACTOR
L HSII
CONTROL
PANEL
C
L1
(HOT)
L2
H
M5945
SYSTEM COMPONENTS
O
COOL CHANGEOVER
VALVE
Y
COMPRESSOR
CONTRACTOR
G
AUX. HT. RELAY
FAN RELAY
W2
L2
R
L1
(HOT)
1
M8000
1
60-2485—8