Orion System RNE Modular Controller - Manual (Page 67)

RNE Modular Controller Field Technical Guide
SEQUENCE OF OPERATION
67
Title 24 Economizer & VAV/Zone Controller Alarms
Title 24 Economizer Alarms
Economizer Temperature Sensor Failure
Outside Air or Supply Air Temperature Sensor is shorted or missing.
Economizer Not Economizing When it Should
Economizer is enabled but not following the desired Economizer posi-
tion commanded.
Economizer Is Economizing When It Should Not
Economizer is not enabled but the feedback signal indicates a position
more open than the minimum.
Economizer Damper Not Modulating
Economizer is enabled but not within 10% of desired position within
150 seconds.
Economizer Excess Outdoor Air Filter
Economizer feedback is lost or Economizer is not following commanded
position.
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 Air Flow 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 Hi Zone
Alarm Offset (user adj.) for the Zone Alarm Delay Period (user adj.),
this alarm will be generated.
Low Space Temp Alarm
If the zone temperature is below the Heating Setpoint by the Lo Zone
Alarm Offset (user adj.) for the Zone Alarm Delay Period (user adj.),
this alarm will be generated.
Damper Feedback Failure Alarm
If the controller fails to detect the actuator feedback signal, this alarm
will be generated.