When a T-600 initiates heat mode, what is the first step it takes?

When a T-600 initiates heat mode, the first step it takes is to open the purge valve for a variable amount of time. This action is crucial because it allows for any residual refrigerant in the system to be purged. Properly purging the system helps prevent contamination and ensures that the heat exchange process begins with the right conditions in place.

Opening the purge valve also aids in stabilizing the pressure in the system before moving on to other operational steps, such as shifting the three-way valve or energizing components like the DPR (Differential Pressure Regulator). Without this initial purge, there could be inefficiencies or potential issues in the heat exchange process that follow.

By initiating the heating process in this manner, the T-600 ensures a smooth transition into heat mode, preparing the system effectively for optimal operation.