Schematic And Hookup Of T874A With Q674Q. Used In Fan Coil Applications; Schematic And Hookup Of T874C With Q674N. Used In Evaporative Cooler Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
FALL
H1
RISE
C1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 59. Schematic and hookup of T874A with Q674Q. Used in fan coil applications.
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
FALL
H2 ANTICIPATOR
H2
RISE
C1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 60. Schematic and hookup of T874C with Q674N. Used in evaporative cooler applications.
60-2485—8
1
H1
SYSTEM
ANTICIPATOR
SWITCH
HEAT
OFF
4
COOL
8
9
C1
ANTICIPATOR
10
1
4
6
8
9
C1 ANTICIPATOR
10
SUBBASE
W1
B
R
FAN
SWITCH
G1
LO
MED
G2
HIGH
O
ON
Y1
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
EVAP
COOL
OFF
HEAT
104
SYSTEM COMPONENTS
HEAT
RELAY 1
1
L1
(HOT)
L2
L2
K1 RELAY
K1
K2 RELAY
K2 K2
HI MED
3 SPEED FAN
COMPRESSOR
SCHEMATIC
CONTACTOR
SYSTEM COMPONENTS
L1
(HOT) L2 1
W1
COOL RELAY
CONTACT
G
R
W2
B
Y1
Y2
L1
K1
K2
LO
M3729
FAN RELAY
ELEC. HT. RELAY
CHANGEOVER
VALVE
COMPRESSOR
CONTACTOR
EVAPORATOR
RELAY
M2863