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VAV/Zone Controller Package
SEQUENCE OF OPERATIONS
Alarms & Tenant Override Logs
Alarm Detection and Reporting
The VAV/Zone Controller continuously performs self diagnostics
during normal operations to determine if any operating failures
have occurred. These failures can be reported to the user in sev-
eral ways, depending on the type of system and options installed
by the user. If a System Manager TS-L is connected, the alarms
will be reported on the Status Screens. If the Prism 2 computer
software is installed, the alarms will be reported on the main
screen of the program and be logged to disk. If the remote com-
munications option is installed, all alarms can initiate an e-mail to
alert someone to the alarm condition. See the
Prism 2 Technical
Guide
for further information on this topic.
VAV/Zone Controller Alarms
Space Sensor Failure Alarm
If the controller detects an open or short on the Space Sensor
input, this alarm will be generated.
CFM Sensor Failure Alarm
If the Airfl ow Constant (K Factor) is set to any value other than
zero, and the controller does not detect the Airfl ow Sensor, this
alarm will be generated.
Damper Opening Alarm
After initial calibration, if the damper is called to be fully open
and cannot reach that position within approximately 2 minutes,
this alarm will be generated.
Damper Closing Alarm
After initial calibration, if the damper is called to be fully closed
and cannot reach that position within approximately 2 minutes,
this alarm will be generated.
High Space Temp Alarm
If the zone temperature is above the Cooling Setpoint by the High
Zone Alarm Off set (user adjusted) for the Zone Alarm Delay
Period (user adjusted), this alarm will be generated.
Low Space Temp Alarm
If the zone temperature is below the Heating Setpoint by the Low
Zone Alarm Off set (user adjusted) for the Zone Alarm Delay
Period (user adjusted), this alarm will be generated.
Damper Feedback Failure Alarm
If the controller fails to detect the actuator feedback signal, this
alarm will be generated.
Tenant Override Logs
If you require tenant billing for push-button override usage, a
MiniLink PD 5 must be installed on each local loop. The Mini-
Link PD 5 has the ability to track the amount of override time gen-
erated by each space sensor equipped with push-button override.
Storing and retrieving these logs requires a dedicated computer
running the Prism 2 front-end software program. No other method
exists for retrieving these logs. This means that all of your units
must be connected together on the communications loop and the
loop must be terminated at a CommLink device connected to the
on-site computer.
WARNING:
The computer must be on 24 hours a day 7
days a week running the Prism 2 software in order for tenant
logging to be tracked.
The tenant logs are kept on the dedicated jobsite computer’s
hard drive. The only limitation to the number of logs stored is
the capacity of the hard drive on the computer to which it is
being logged.
NOTE:
For proper time and date stamping of the tenant
log, you must confi gure the air handler to broadcast the
time so that the VAV/Zone Controllers can read it and use
it in their tenant and trend logs.
