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Hi, I am using a fan:onoff object within a Zone:HVAC:TerminalUnit:VariableRefrigerantFlow object, and for some reason even though my runtime fractions for the heating and cooling coils within the object are often between 0 and 1 (i.e. 0.5), the runtime fraction for the Fan:OnOff only bounces from 0 to 1, 1 if there is any load, and 0 if there is no load. The engineering and I/O reference seem to suggest that the fan power and runtime fraction should calculate as if the fan cycles with the coils, but in my model this is clearly not the case. I would appreciate any help. Is there a specific input to force the fan to behave the way I want?

Hi, I am using a fan:onoff object within a Zone:HVAC:TerminalUnit:VariableRefrigerantFlow object, and for some reason even though my runtime fractions for the heating and cooling coils within the object are often between 0 and 1 (i.e. 0.5), the runtime fraction for the Fan:OnOff only bounces from 0 to 1, 1 if there is any load, and 0 if there is no load. The engineering and I/O reference seem to suggest that the fan power and runtime fraction should calculate as if the fan cycles with the coils, but in my model this is clearly not the case. I would appreciate any help. Is there a specific input to force the fan to behave the way I want?

Hi, I am using a fan:onoff object within a Zone:HVAC:TerminalUnit:VariableRefrigerantFlow object, and for some reason even though my runtime fractions for the heating and cooling coils within the object are often between 0 and 1 (i.e. 0.5), the runtime fraction for the Fan:OnOff only bounces from 0 to 1, 1 if there is any load, and 0 if there is no load. The engineering and I/O reference seem to suggest that the fan power and runtime fraction should calculate as if the fan cycles with the coils, but in my model this is clearly not the case. I would appreciate any help. Is there a specific input to force the fan to behave the way I want?