Orion System VCC-X Controller - Manual (Page 66)

Zone
Zone
SEQUENCE OF OPERATIONS
VCC-X Controller Technical Guide 66
Outdoor Air Lockouts, System Broadcasts & Alarms
Outdoor Air Lockouts
The compressors are disabled during Cooling Mode when the
Outdoor Air Temperature is below the Compressor Cooling Lockout
Setpoint.
Mechanical heating is disabled when the Outdoor Air Temperature
is above the Heating Lockout Setpoint.
For Air to Air Heat Pumps, the compressors are disabled during
Heating Mode when the Outdoor Air Temperature is below the
Compressor Heating Lockout Setpoint.
System Broadcasts
An Outdoor Air Temperature Sensor reading is broadcast from
any one VCC-X Controller to any controller that does not have an
Outdoor Air Temperature Sensor.
Alarm Detection and Reporting
The VCC-X Controller continuously performs self diagnostics
during normal operation to determine if any operating failures have
occurred.
These failures (alarms) can be reported to a Touch Screen System
Manager, a Hand Held Modular Service Tool, or to a computer
running Prism 2 software.
Diagnostic LEDs on the VCC-X controller will generate “blink
codes” for certain alarm conditions.
The following are the available alarm designations for the VCC-X
Controller:
Bad SAT Sensor
Bad RAT Sensor
Bad OAT Sensor
Bad Space Sensor
Bad CO
2
Sensor
Bad Building Pressure Sensor
Missing Outdoor CFM Sensor
Missing Exhaust CFM Sensor
Missing Supply CFM Sensor
Missing Return CFM Sensor
Mechanical Cooling Failure
Mechanical Heating Failure
Fan Proving Alarm
Dirty Filter Alarm
Emergency Shutdown
Relay Runtime
No Economizer Feedback
Title 24 Economizer Air Temperature Sensor Failure
Title 24 Economizer Damper Failure
Title 24 Economizer Excess Outdoor Air
Title 24 Economizer Not Economizing When It Should
Title 24 Economizer Economizing, But Shouldn’t
High Supply Air Temperature Cutoff
Low Supply Air Temperature Cutoff
High Control Temperature
Low Control Temperature
Missing RSM #1
Missing RSM #2
Missing RSM #3
Missing RSM #4
Missing PREHEAT-X
Missing MHGRV-X
Missing MODGAS-X
Missing EM1
Missing 12RLY