April 29, 2011
The main application of the HEP Isolation Heat Exchanger Panel is to provide single wall isolation between a DHW tank and a heating system. While other applications are possible, it is important to note that this panel is not a temperature control device. The secondary water temperature is wholly dependent on the temperature of the primary supply water. The HEP095 is designed for applications where there is an extremely high flow resistance in the heat source. When the panel receives a call for heat, it activates both primary and secondary pumps. The primary pump is also activated once every 24 hours, for 15 minutes, to ensure that potable water in the piping or heat exchanger is not stagnant.
The panel is pre-wired to work with the HEPPS DHW priority switch which can be mounted inside the panel. When using the HEPPS priority switch, a flow sensor is installed in the DHW supply to the house downstream from the branch to the HEP panel. When the HEPPS detects water flow, it will turn off the primary pump in the HEP panel, until such time that the DHW flow to the house falls below ~0.7 US gpm.