Carrier Connect 33CONNECTSTAT43FX - Page 8

What is the Carrier Connect™ 33CONNECTSTAT43FX Thermostat?
Carrier Connect™ Wi-Fi Thermostat 33CONNECTSTAT43FX CARRIER CORPORATION ©2021
Installation Guide All rights reserved
4
• Heating
○ W1 - first stage heat
○ W2 - second stage heat
○ W1 + W2 - third stage heat
HP with electric heat (up to 2 stages of cooling and 5 stages of heating with 3 stages auxiliary)
• Cooling
○ Y1 + O/B - first stage cooling
○ Y1 + Y2 + O/B - second stage cooling
• Heating
○ Y1 - first stage HP heating
○ Y1 + Y2 - second stage HP heating
○ Y1 + Y2 + W1 - HP heating + first stage aux heat
○ Y1 + Y2 + W2 - HP heating + second stage aux heat
○ Y1 + Y2 + W1 + W2 - HP heating + third stage aux heat
HP with gas heat (up to 2 stages of cooling and 4 stages of heating with 2 stages auxiliary)
• This system is known as a dual fuel system.
• When gas heat turns on, the HP heat turns off unless defrost is active.
• Once the gas is turned on, the heating demand is satisfied with gas heat. The thermostat does not stage
down from gas to heat pump heat.
• Cooling
○ Y1 + O/B - first stage cooling
○ Y1 + Y2 + O/B - second stage cooling
• Heating
○ Y1 - first stage HP heating
○ Y1 + Y2 - second stage HP heating
○ W1 - first stage aux heat
○ W1 + W2 - second stage aux heat
Definitions
Heat demand
The space temperature is less than the heat setpoint (HEAT TO setting).
Cool demand
The space temperature is greater than the cool setpoint (COOL TO setting).
Heat demand satisfied
The space temperature is greater than the heat setpoint (HEAT TO setting).
Cool demand satisfied
The space temperature is less than the cool setpoint (COOL TO setting).