“Hot running” describes the increase in temperature of a fluid which is caused by a closed pressure- and/or suction pipe. Liquid is circulating within the pump, however this liquid is not transported out of the pump housing and so the heat can not be transferred by the fluid. During circulating within the pump housing the fluid will be heated. This increase in temperature can be so high that damages at the pump parts may be caused.
This is the reason for protecting your pump and your process with the RENNER RPR-Control-100