Schematic And Hookup Of T874P, D, F With Q674B. Used In Pump Applications; Schematic And Hookup Of T874G With Q674D. Used In Standard Applications - Honeywell T874 Product Data

THERMOSTAT
FALL
1
2
H2
H1 ANTICIPATOR
3
4
5
6
CO
RISE
H1
8
9
RISE
C1 ANTICIPATOR
C1 10
POWERSUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2 JUMPER HONEYWELL SUPPLIED, FIELD INSTALLED.
Fig. 57. Schematic and hookup of T874P with Q674B. Used in heat pump applications.
FALL
FALL
RISE
RISE
Fig. 58. Schematic and hookup of T874G with Q674D. Used in standard applications.
SUBBASE
FAN SWITCH
AUTO
ON
SYSTEM
SWITCH
OVERRIDE
HEAT
OFF
COOL
THERMOSTAT
2
H1 ANTICIPATOR
H1
3
4
H2 ANTICIPATOR
6
H2
8
9
C1 ANTICIPATOR
CO
10
C1
103
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
Y
COMPRESSOR
CONTACTOR
G
R
CLOSED-DAY
OPEN-NITE
B
L
S
JUMPER
2
P
W
T
SUBBASE SYSTEM COMPONENTS
Y
NO FAN
SWITCH
RH
O
W
NO SYSTEM
SWITCH
RC
CONTROL
PANEL
SYSTEM COMPONENTS
FAN RELAY
B RELAY
1
COOL CHANGEOVER
VALVE
M8004
ECONOMIZER
PACKAGE
Y
O
W2
B
O
M3722
L1
(HOT)
L2
60-2485—8