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HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE
T8511 Deluxe Electronic Heat Pump Thermostats
The T8511 models control two-stage heat and one-stage cool in heat pump systems, using manual or automatic
changeover. First stage heat anticipation is fixed; second stage heat anticipation is selectable at 3, 6, or 9 cph. Setpoints
are permanently held in memory (no batteries required) and retained during power failures. Electronic thermostats provide
droopless temperature control. The T8511 models also include a backlit display and outdoor sensing capability.
Electronic Programmable Heat Pump Thermostats
T8011 Standard Electronic Heat Pump Thermostats
The T8011 models provide two-stage heat and one-stage cool control for heat pump systems, using manual
changeover. First stage heat anticipation is fixed; second stage heat anticipation is selectable at 1, 3, 6, or 9 cph. The
user can program up to four time periods and temperature setpoints. All programs and setpoints are permanently held in
memory in the event of a power outage. Electronic thermostats provide droopless temperature control.
Chronotherm® III Electronic Heat Pump Thermostats
The T8611 Chronotherm III models provide up to three-stage heat and two-stage cool control for heat pump systems,
using manual or automatic changeover. Models are available with selectable daily schedules for weekdays, Saturday,
and Sunday; or full 7-day programming. Models include LED indication for system operation and status. Battery backup,
with low battery indication, maintains clock and memory during power outages. Adjustable second stage cycling allows
for use of the thermostat with electric heat or fossil fuel while providing optimum comfort.
Using the Chronotherm III or Chronotherm IV T8611M on Two-Speed Heat Pump Compressor Equipment
The T8611M is a three-stage heat/two-stage cool thermostat used to control multistage heat pump equipment. However,
there is no difference in controlling multistage equipment and in controlling two-speed multistage equipment. The
differential required between stage 1 and stage 2 in multistage equipment is the same as the differential required
between low-speed and high-speed in two-speed equipment.
To connect the T8611M to two-speed heat pump equipment:
1.
Connect the Y terminal to the low-speed compressor terminal.
2.
Jumper the Y2 and W2 terminals.
3.
Connect the Y2 terminal to the high-speed compressor terminal.
4.
Connect all other terminals as shown in the wiring diagram below.
5.
Configure the O/B terminal for changeover in either heating or cooling.
Fig. 1. Using the T8611M on two-speed heat pump compressor equipment.
a
On selected T8611M models, the high speed compressor is wired to the Y2 terminal. In these cases, no jumper is required.
70-6627 • 6
a
Equipment
Equipment Function
Terminals
C
Transformer Common
R
Power
Fan
G
O
Cooling Changeover
B
Heating Changeover
1st Stage Compressor
Y
Y2
2nd Stage Compressor
Third Stage Heat
W3
E
Emergency Heating
a
T8611M
Terminals
C
R
G
or
O
O/B
or
B
O/B
Y
a
Y2
W2
W3
E
M13229
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