Honeywell chronotherm iii t8611m User Manual

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The T8611M Deluxe Programmable Heat Pump Thermostat provides electronic control of 24 Vac single-zone two 
compressor or two speed heat pump systems with auxiliary heat. The T8611M can be configured to run a single 
compressor heat pump system. Refer to Table 1 for a general description of the thermostat. All T8611 thermostats 
require a common wire to supply power.

If this control is replacing a control that contains 
mercury in a sealed tube, do not place your old 
control in the trash. Dispose of properly.

Contact your local waste management authority 
for instructions regarding recycling and the 
proper disposal of the old control. 

1. Read these instructions carefully. Failure to follow 

the instructions can damage the product or cause 
a hazardous condition.

2. Check the ratings given in the instructions and on 

the product to make sure the product is suitable for 
your application.

3. Installer must be a trained, experienced service 

technician.

4. After completing installation, use these instructions 

to check out the product operation.

Install the thermostat about 5 ft (1.5m) above the floor in 
an area with good air circulation at average temperature. 
See Fig. 1.

Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall 

behind the thermostat.

M

Automatic

Em Heat-Heat-Off-Cool-Auto

On-Auto

Down-selectable for single-compressor 
systems.