[Equest-users] Heat pump heating with boiler backup

[Bassam Yammine]

Hi All, I'm modeling a system with heat pump chiller for heating and boilers as backup. When I specify the heating source for each space as Heat Pump I get the error saying that the HW loop has zero flow. Is there a way to fix this. It seems to work if I keep at least on space on the boiler system. I attached the file for anyone who is willing to help.
 
Much appreciated.
 
Bassam Yammine
Flow Consulting
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