The Glitch: Eager to keep up with this new technology, an installer decides to install a hydraulic separator between a boiler and distribution system as shown below. The space heating loads consist of two “unmixed” zone circuits, and one mixed zone circuit. The installer connects the unmixed higher temperature loads upstream of the mixed lower temperature load. All the load circuits are supposed to operate independently. The indirect water heater is operated as a priority load.
When the system was turned on, there was very little warmth from the low temperature loads. What’s the problem? Can you also spot a few more missing or incorrect details?