Question-and-Answer Resource for the Building Energy Modeling Community
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I had a similar problem with the HeatPump:WaterToWater:Heating:EIR component of Energyplus 9.1. I had a very simple hot water loop that was working in the demand side, but in the supply side the heat pump wasn't requesting any water flow.
The problem was that I had added a bypass pipe in the supply loop. All the water flow was going through the bypass pipe instead of being shared between the heat pump and the bypass pipe. I deleted the bypass pipe and then the heat pump started working.
I'm not familiar with OS, but maybe in your second picture is there a bypass pipe in the "supply equipment" side?
