Question-and-Answer Resource for the Building Energy Modeling Community
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The only way I know to achieve this control is using EMS. The EMS program would be rather simple and there are several examples and documentation to aid in the programming. See example files EMS*.idf and documentation EMSApplicationGuide.pdf.
The simple EMS program would basically use: if RH > RHmax, heater on (usually by raising the zone thermostat set point temperature) and then RH < RHmin, heater off (usually be resetting the zone thermostat set point temperature to NULL).
