Honeywell HEAT PUMP THERMOSTAT T8411R, Manual, Page: 5 / 12

T8411R ELECTRONIC HEAT PUMP THERMOSTAT
5 68-0185—2
Fig. 6. T8411R two-stage heat, one-stage cool wiring diagram with manual changeover.
Fig. 7. Mounting thermostat to wallplate.
L1
(HOT)
L2
1
1
2
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).
NOT ALL MODELS HAVE BOTH O AND B TERMINALS.
SYSTEM
SWITCH
HEAT
OFF
COOL
R
W2
L
B
O
Y
EM. HT.
W1
E
AUXILARY
HEAT RELAY
CHANGEOVER
VALVE HEAT
CHANGEOVER
VALVE COOL
COMPRESSOR
CONTACTOR
COMPRESSOR
CONTACTOR
HEAT
FAN RELAY
RELAY
EMERGENCY
HEAT RELAY
G
C
THERMOSTAT
LOGIC
THERMISTOR
SENSOR
POWER
SUPPLY
ON
AUTO
STAGE 2 RELAY
STAGE 1 RELAY
FAN SWITCH
M11333A
3
3
M18577
SYSTEM
Cool Of
f Heat Em Ht
Auto On
FAN
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
SYSTEM
Cool Of
f Heat Em Ht
Auto On
FAN
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON MOUNTING PLATE.
PRESS LOWER EDGE OF
CASE TO LATCH.
A
B
Em Ht
Aux Ht
Set Room
Em Ht
Aux Ht
Set Room