12
BAS-SVP18D-EN
Initiating System Control
By default, the following BACnet points are put out of service and need to be put into service to
be used, if required:
•
Space Temperature BAS
•
Space Humidity BAS
•
Outdoor Air Temperature BAS
•
Discharge Temperature BAS
•
Outside Air Temperature BAS
•
Outdoor Air Humidity BAS
Routinely Updating BAS Values
The UC600 requires the BAS system to provide a routine update to the sensor values. This
protects against communication loss between the BAS and the UC600. By BACnet definition, the
present value of the object maintains the last value written to it, regardless of the amount of time
that has elapsed since the last write. If communication is lost for several minutes or longer, the
present value of BAS-supplied sensor objects may no longer represent the current state of
environmental conditions. This may result in decreased occupant comfort and damage to
building systems.
Alarm Reset
The UC600 control system monitors the operation of the HVAC equipment. If an abnormal
condition is detected, an event notification message is sent to the Tracer SC. The corresponding
binary input object will change state from inactive to active when the diagnostic or alarm is
detected. The object has been configured to send a BACnet event message to external BACnet
devices as defined by the protocol.
The BAS has the ability to reset internal diagnostics or alarms by controlling the state of the
Alarm Reset object (BV16) as follows:
•
Change the state of the
(BV16) to the active state.
•
Upon the change to active state, the UC600 control system will reset all internal diagnostics/
alarms and set the state of all the diagnostic/alarm objects to inactive.
•
Upon completion of this action, change the state of the
(BV16) back to
the inactive State.
