Schematic And Hookup Of T874C With Q674L. Used In Heat Pump Applications; Schematic And Hookup Of T874R, R With Q674L. Used In Heat Pump Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1 ANTICIPATOR
H1
FALL
FALL
H2 ANTICIPATOR
H2
C1 ANTICIPATOR
RISE
C1
Fig. 105. Schematic and hookup of T874C with Q674L. Used in heat pump applications.
THERMOSTAT
FALL
H1
C1
H2
H2 ANTICIPATOR
FALL
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
Fig. 106. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
60-2485—8
1
FAN SWITCH
2
4
SYSTEM
SWITCH
6
EM. HT.
8
10
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
2
FAN SWITCH
H1/C1
ANTICIPATOR
3
4
SYSTEM
SWITCH
5
6
SUBBASE
AUTO
ON
EM. HT. LED
(RED)
HEAT
OFF
COOL
SUBBASE
AUTO
ON
EM. HT.
EM. HT.
LED
HEAT
(RED)
OFF
COOL
128
SYSTEM COMPONENTS
FAN RELAY
G
HEAT RELAY 2
W2
K
L EM. HT. RELAY
SYSTEM
MONITOR
SWITCH
IHRI
C
R
RHI
COMPRESSOR
CONTRACTOR
Y
W1
HEAT RELAY 1
1
L1 L2
(HOT)
SYSTEM COMPONENTS
COOL CHANGEOVER
VALVE
O
FAN RELAY
G
L1
R
(HOT)
L2 1
AUX. HT. RELAY
W2
X
COMPRESSOR
CONTACTOR
Y
EM. HT. RELAY
E
M8384
M4724