The heat pump drives the compressor for heating and cooling. Your heating and air conditioning system is revitalized by connecting a heat pump to an internal heating band. The thermostat controls the full operation of the heat pump system installed with the optional heating tape. The thermostat manufacturer's algorithms indicate the optimal times and intervals for the heat pump, possible heating levels for your model, the heating rod, and the speed of the indoor fan. The control parameters for your system can be found in the Thermostat Configuration menu, accessed through the switches defined by each thermostat model. Information on the parameters can be found in the heat pump's installation instructions and the heating tape.   Things You Will Need to Wire a Heat Pump Thermostat Screwdriver Wire Strippers Cutting Pliers Plastic Cable Ties   Variants for Connecting a Heat Pump Thermostat Heat pumps move the heat from one place to another. The switch between heating and cooling depends on the season and the thermostat setting. Besides, the air source heat pumps have backup heating methods for two reasons.   When the heat pump system starts defrosting, it needs a backup heat source.   The main method of backup or backup heating for heat pumps is electrical tape heaters. The second most common reserve heat source is a gas oven. Finally, these two different methods may require a separate connection of the heat pump thermostat.   Heat Pump Wire Labels Name and connection of cable C - old cable C? This is a common thread that has caused indigestion and sleepless nights in many people. The reason for this is that most modern thermostats need or need a C-wire to work. The usual 24 V C cable comes from the control transformer and the above-mentioned R cable. Four-wire HVAC system control transformer. One side is also for the mains voltage in the transformer, and the other side is the 24 V control voltage that comes from the other side of the transformer.    Designation and connection of cable R - Cable R is the 24 V hot cable of the 24 V control transformer. This is the way to enable control relays and connections in your system. The thermostat is just a switch, and the power from the transformer comes through this device.   The Wiring Problem C The C-wire is generally dark blue in color. This means that if you don't have the correct amount of wire in the thermostat, you will need to connect the new thermostat wire to the new thermostat. In other words, you have the right number of conductors for your new thermostat to work properly. A heat pump thermostat requires more connections than an air conditioning thermostat. This also provides the C-wire.