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APPENDIX F (SmartTech Alarms)
Alarm Classifications
Major Alarms are those alarms that will cause the
Air Dryer to Shut Down and become registered at the
CO Terminal Block These alarms are Low and High System Pressure, Low and High Water level, Low
and High Water Temperature, Circuit Breaker, Power Loss and Humidity ( Minor first then Major after
the 5 minute shutdown delay)
Minor Alarms are those alarms that will allow uninterrupted Dryer operation and become registered at
the CO Terminal Block. These alarms are Low and High Output Line Pressure.
SmartTech Air Dryer Alarms
A Low System Pressure Major Alarm occurs when the system pressure drops below 15 psig . Upon
Start-up, there is a 45 Second disarm period. After the start-up disarm period, there is a 10 second Time
Lag before the alarm becomes registered at the CO and Segregated Terminal Blocks with no Delay on
Shutdown.
A High System Pressure Major Alarm occurs when the system pressure rises above 40 psig .
Upon Start-up, there is a no disarm period. There is a 10 second Time Lag before the alarm becomes
registered at the CO terminal blocks with no Delay on Shutdown.
A Humidity Major Alarm occurs when the %Relative Humidity of the outlet air rises above 5%RH.
. Upon Start-up, there is a 180 Second disarm period., After the start-up disarm period, there is a 5
second Time Lag before the alarm becomes registered at the CO and Segregated Terminal Blocks with
5 minutes Delay on Shutdown. Note, there are no delays or disarming for the Humidity Bypassing control
circuit.
A Low Water Major Alarm occurs when the Low Water Float drops below its corresponding switch.
Upon Start-up, there is a 15 Second disarm period. After the start-up disarm period, there is a 5 second
Time Lag before the alarm becomes registered at the CO and Segregated Terminal Blocks with no Delay
on Shutdown.
A High Water Major Alarm occurs when the High Water Float rises above its corresponding switch.
Upon Start-up, there is no disarm period. There is a 5 second Time Lag before the alarm becomes
registered at the CO and Segregated Terminal Blocks with no Delay on Shutdown.
A Low Line Pressure Minor Alarm occurs when the line pressure drops below the factory default
setting of 8 psig . Upon Start-up, there is a 180 Second disarm period. After the start-up disarm period,
there is a 5 second Time Lag before the alarm becomes registered at the CO and Segregated Te r minal
Blocks. Alarm resetting is automatic upon clearing.
A High Line Pressure Minor Alarm occurs when the line pressure rises above the factory default
setting of 20 psig . Upon Start-up, there is a no disarm period. There is a 5 second Time Lag before the
alarm becomes registered at the CO and Segregated Terminal Blocks. Alarm resetting is automatic upon
clearing.
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