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VAV-SLM002-EN 9
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.