Supply Air Tempering
It is now possible to enable the Supply Air Tempering function in a Voyager via the CCP. This allows the Voyager to cycle a stage of heat on and off to warm up the supply air stream and better manage the load created by increased ventilation air requirements.
CO2 Based Demand Control Ventilation
CO2 sensors many now be connected to VariTrac zone UCMs. Up to one sensor per zone on the system may be applied. The CCP Demand Control Ventilation configuration screen allows you to set a minimum ventilation damper position for the Voyager/Precedent unit, and a maximum ventilation damper position. You also configure a normal CO2 setting and an alarm CO2 setting. As the CO2 rises between the normal setpoint and the alarm setpoint, the CCP resets the damper position to increase ventilation. The CCP can be configured to gather CO2 measurements from one specific sensor, or to gather information from all the sensors on the system and select the highest value.
Zone Occupied Standby Function
A VariTrac UCM can now have an occupancy sensor connected to it, and can be configured to perform an occupied standby function. This mode is available whenever the VariTrac system is in the occupied mode. The zone will be in standby using its unoccupied setpoints if motion is not detected by the zone occupancy sensor. When motion is detected in the space, the UCM shifts to its occupied setpoints, and will remain that way until 30 minutes (adjustable) after motion ceases.
System Balance Mode
A VariTrac system can be placed in the balance mode from the operator display or the PC software using a single button selection. In this mode, the CCP automatically prepares the VariTrac system for balancing by starting the supply fan, disabling heating and cooling, closing the bypass damper, and opening all zone dampers to their maximum position. The system can then be balanced as a single zone system using mechanical hand balancing dampers.
Global Sensor Setpoint Limit Set-up
If the zone setpoint thumbwheels are enabled, their functional range should be limited to about a 5 degree span to avoid nuisance changeover. This requires you to access each individual UCM and manually adjust the limits. The new VariTrac CCP allows you to create a single set of limits, and then broadcast them to all the zones on the system at one time by pushing a single button.
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