Schematic And Hookup Of T874C With Q674B. Used In Heat Pump Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
FALL
H1
H1 ANTICIPATOR
FALL
H2 ANTICIPATOR
H2
C1
RISE
C1 ANTICIPATOR
RISE
C2
Fig. 249. Schematic and hookup of T874C with Q674B. Used in heat pump applications.
Home and Building Control Home and Building Control
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
60-2485—8 J.H. Rev. 3-01
1 FAN
SWITCH
AUTO
3
4
6
SYSTEM
8
SWITCH
HEAT
9
COOL
10
C2 ANTICIPATOR
11
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
FIELD WIRE JUMPER TO ALLOW SINGLE SYSTEM TRANSFORMER.
SUBBASE
W1
G
ON
RC
W2
B
SERVICE
LED (RED)
C
X
RH
O
OFF
Y1
Y2
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
SYSTEM COMPONENTS
HEAT RELAY 1
FAN RELAY
2
HEAT RELAY 2
HEAT DAMPER
L1
(HOT)
1
L2
COOL DAMPER
COMPRESSOR CONTACTOR 1
COMPRESSOR CONTACTOR 2
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M18622