[EnergyPlus_Support] Re: Intermittent Fan Operation - Fan won't cycle

["Jean marais" <jeannieboef@xxxxxxxxx>]

Set your fan object availability to always 1.
In the HVACUnitary object set the "Supply Air Fan Operating Mode Schedule Name" field so as to point to the schedule turning the mode to either cycling (load dependant) or continous as you wish (i.e. schedule values of Zero or non-Zero to indicate the mode). See i/o ref documentation. 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "onecolumbyte" <onecolumbyte@...> wrote:
>
> I am modeling a zone which uses a Low Temp radiant object for primary cooling with UnitaryFurnace HeatCool as a backup heating/cooling system.
> 
> I want the fan on the Unitary Furnace to cycle, and run only with load.
> 
> My fan object if Fan:OnOff. 
> 
> The ZonHVACEquipment list object lists the LowTemp radiant as 1 and the Unitary as 2.
> 
> When the unitary furnace Fan schedule is set to 0 the fan stays off all year, and no cooling or heating is provided. The space has many unmet load hours. The variables show 0 run hours for the fan and 0 heating and cooling supplied by the Unitary unit.
> 
> When the Fan schedule is revised to 1, heating and cooling is provided when demanded, the unmet load hours are 0, and the fan runs continously all year.
> 
> How do I enable fan cycling?
>




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