6
Table 2 lists features and wiring terminal functions of the TRADELINE T8611M thermostat.
TABLE 2—T8611M FEATURES AND TERMINALS.
T8611M
FEATURES
COMMENTS
Heating Stages
3
May be applied to 2-stage heat pump systems; see wiring
Cooling Stages
2
diagrams Figs. 6 and 7.
Changeover
Auto
Programming
7-day
SYSTEM LED
Yes
Lights on call for heat or cool.
EM. HEAT LED (red)
Yes
Lights continuously in EM. HEAT mode.
AUX. HEAT LED (green)
Yes
Lights during call for final auxiliary heat stage.
CHECK LED (yellow)
Yes
Field wired option; indicates equipment malfunction.
Remote Temperature
Yes
Available on T8611M7040 only. (202905A Remote Sensor
Sensing
included).
WIRING TERMINAL
FUNCTION
24 Vac Common
C
Must be connected to control transformer to operate
thermostat.
24 Vac Power
R
Compressor, Stage 1
Y
heat and cool.
Compressor,
Y2
If applying T8611M to 1-stage cooling system, leave Y2
Stage 2 cool
unconnected.
Second Stage Heat
W2
If applying T8611M to 2-stage heat systems in which the
Auxiliary (Resistive)
second stage is compressorized, connect stage 2 to W2;
Third Stage Heat
W3
leave W3 unconnected.
If 2-stage heat system in which the second stage is auxillary
(electric resistive), connect auxiliary stage to W3; leave
W2 unconnected.
Fan
G
Changeover Heat Mode
B
O/B changeover terminals are energized continuously
following first call for cool or heat, respectively.
Changeover Cool Mode
O
System Monitor,
L
Energizes EM. HEAT LED when externally powered.
continuously energized
in EM. HEAT mode.
Emergency Heat
E
energized on call for
stage 1 heat in
EM. HEAT mode
Check LED terminals
X1
X2
See wiring diagrams for hookup alternatives.
to indicate equipment
malfunction
Remote Temperature
S1
S2
S3
Available on T8611M7040 only. Must be connected to
Sensing
202905A Remote Sensor for proper thermostat operation.
T8611M
SELECTION/APPLICATION
