Schematic And Hookup Of T874Y With Q674F. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
2
H1
FALL
H1 ANTICIPATOR
3
4
H2
H2 ANTICIPATOR
FALL
5
7
RISE
C1
8
9
C1
ANTICIPATOR
10
C2
C2
RISE
ANTICIPATOR
11
CO
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 248. Schematic and hookup of T874Y with Q674F. Used in heat pump applications.
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
FAN SWITCH
AUTO
ON
SYSTEM
SWITCH
OFF
EM. HT.
HEAT
AUTO
COOL
223
SYSTEM COMPONENTS
R
L
G
W2
E
AUX. HT.
LED (RED)
MALFUNCTION
LED (RED)
C
HIGH SPEED
LED (YELLOW)
LOW SPEED
LED (GREEN)
Y1
Y2
O
COOL
CHANGEOVER VALVE
L1
(HOT)
L2
1
FAN RELAY
AUX. HT. RELAY
EM.HT. RELAY
COMPRESSOR
CONTACTOR 1
COMPRESSOR
CONTACTOR 2
M5923
60-2485—8