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[EnergyPlus_Support] Maximum iterations exceeded



Hi, I have a problem with a heating plant that includes two purchased
hot water elements and baseboard heaters.
The .err file denotes no severe errors, but reports over 100000
warnings with this message:

** Warning ** SimHVAC: Maximum iterations (20) exceeded for all HVAC
loops, at Milano MI Italy Custom-160660 WMO#=160660, 10/15 02:00 - 02:10

In this plant scheme the water heater is placed on the supply side of
the loop that includes baseboard heaters, and on the demand side of
the loop that provides hot water.

In a previous plant scheme the water heater was connected on the
supply side of both plant loops: in this case, there were detected no
warnings about iterations.

Can you help me and explain which of the plant settings induces the
warning messages?

I'm uploading the idf file.


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