What is a good service practice when installing a reversing valve?

Using heat paste and wet rags while brazing is a good service practice when installing a reversing valve because these methods help prevent overheating and damage to sensitive components nearby. Heat paste can aid in achieving a good braze joint by allowing for better heat transfer and ensuring that the joint is properly prepared. Wet rags, when applied to areas that should not be heated, serve as an effective heat sink, minimizing the risk of melting or damaging adjacent parts, such as insulation or plastic components. This practice not only promotes the integrity of the installation but also enhances the longevity and performance of the heat pump system.

In contrast, while using wet rags during soldering is beneficial, it may not be as critical when brazing because brazing temperatures are typically higher. Applying tape to joints before soldering could cause issues during the soldering process, as the tape can burn and create contamination. Finally, using a wrench to tighten all fittings is necessary for proper assembly but does not directly relate to preventing damage during the heat-sensitive installation process as effectively as the combination of heat paste and wet rags does.