Scroll compressors cannot operate in reverse as this will cause overheating and a shorter lifetime for the compressor. A good practice for detecting incorrect phase-sequence is to install a phase-sequence and phase-loss monitoring relay to stop the equipment in case of failure. Incorrect voltage also undermines the compressor service life so, when this is perceived as a risk, voltage monitoring is added.
Our DPA51 and DPB51 monitoring relay series are popular series of products with 3-phase heat pumps. Thanks to their compact size, self-powered design and wide operating voltage, they fit easily into any electrical panel.