Schematic And Hookup Of T874C With Q674C. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1 ANTICIPATOR
3
FALL
H1
4 H2 ANTICIPATOR
FALL
H2
C1
RISE
C1 ANTICIPATOR
3
5
THERMISTER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
MOMENTARY POSITION. SPRING RETURN TO "ON" UPON SWITCH RELEASE.
3 H1 AND C1 ARE DPST SWITCHES.
Fig. 99. Schematic and hookup of T874C with Q674C. Used in standard applications.
60-2485—8
SUBBASE
1
2
OFF
4
AUTO
5
6
FAN
SWITCH
7
AUTO
8
ON
9
2
10
11
12
124
W1
SYSTEM
SWITCH
W2
W3
Y2
SERVICE
LED (RED)
A
G
R
O
COMPRESSOR RELAY
Y1
T
T
4
H3 OFFSET 12 F FROM H2 FOR NIGHT SETBACK.
5 THERMISTOR INTERNAL TO THERMOSTAT.
SYSTEM COMPONENTS
HEAT RELAY 1
HEAT RELAY 2
L2
FAN RELAY
L1
(HOT)
1
MOMENTARY
CIRCUIT
EXTERNAL
TEMP.
READOUT
M531