LX Series Unit Ventilator Controller User's Guide54
The network variable nviOccCmd must be set to SNVT type SNVT_tod_event.
You can do this using the Changeable Nv Manager view of the device.
Because the Optimum Start is based on statistics calculated from the room
temperature and the outside air temperature, the outdoor temperature must be
configured as an input or be received from the network through nviOutdoorTemp.
Emergency Operation
Emergency modes are primarily for situations where the ventilation system may
affect the spread of smoke or other contaminants. There are two possible
situations:
• You want to keep fresh air from entering the building, such as to slow the
spread of a fire.
• You want to allow fresh air into the building.
As a result, the unit ventilator has two emergency modes:
• Emergency Purge: An emergency purge stops the fan, stops any heating or
cooling, and fully opens the fresh air damper.
• Emergency Shutdown: An emergency shutdown stops the fan, stops any
heating or cooling action, and closes the fresh air damper.
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