Schematic And Hookup Of T874F With Q674B. Used In Wood/Coal Applications - Honeywell T874 Product Data

Multistage thermostats and subbases
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THERMOSTAT
FALL
H1
1
H1 ANTICIPATOR
4
FALL
H2
ANTICIPATOR
6
H2
RISE
8
C1
9
10
C1
ANTICIPATOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 61. Schematic and hookup of T874C with Q674N. Used in evaporative cooler applications.
THERMOSTAT
FALL
H2
1
H2 ANTICIPATOR
4
FALL
H1
8
9
H1 ANTICIPATOR
10
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 62. Schematic and hookup of T874F with Q674B. Used in wood/coal applications.
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
EVAP.
COOL
OFF
HEAT
SUBBASE
FAN SWITCH
AUTO
ON
YELLOW
GREEN
SYSTEM
SWITCH
HEAT
OFF
COOL
105
SYSTEM COMPONENTS
COMPRESSOR
CONTACTOR
Y1
FAN RELAY
G
R
ELEC. HT. RELAY
W2
EVAPORATOR
RELAY
Y2
CHANGEOVER
RELAY
O
SYSTEM COMPONENTS
FAN RELAY
G
W2
AUX. HT. RELAY
R
C
WOOD/COAL
RELAY
W1
COMPRESSOR
CONTACTOR
X2
EXTERNAL COOLING
THERMOSTAT
(SUCH AS T87 F)
Y
X1
R
1
L1
(HOT)
L2
M2862
L2
L1
(HOT)
1
M3723A
60-2485—8

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