17
I -
CONTROLLER LEVEL 3
Alert/Alarm Condition Indicators
TABLE 2
I-Controller Level 3 Alert/Alarm Fault Status Indicator Guide
Text Window
Fault Condition
Panel Lights
Process Diagram LEDs*
Audible Alarm (1)
Fault
Event
Alarm
Alert /
Compressor Thermometer Gauge Separator /Filter Contacts N/O Contacts N/C
Notification
Identification
Maintenance
Drain
LCD text
See Troubleshooting Section
Red
Yellow
Green
Green
Red
Green
Alarmed
Normal
ALERT AMBIENT TEMP
High Ambient Air Temperature
-
Flashes
ON/OFF
Flashes
-
-
-
N/C
ALERT INLET AIR TEMP
High Inlet Air Temperature
-
Flashes
ON/OFF
Flashes
-
-
-
N/C
ALARM DEW POINT TEMP
High Dew Point Temperature
Flashes
-
ON
Flashes
-
-
N/O
N/C
SHUTDOWN LOW PRESSURE
Low Compressor Suction Pressure
Flashes
-
OFF
-
Flashes
-
N/O (2)
N/C
SHUTDOWN HIGH PRESSURE
High Compressor Discharge Pressure
Flashes
-
OFF
-
Flashes
-
N/O (2)
N/C
SHUTDOWN MOTOR PROTECT
Compressor Motor Overload
Flashes
-
OFF
-
-
-
N/O (2)
N/C
ALERT MAINTENANCE
Perform Standard Maintenance Reminder
-
Flashes
ON
-
-
-
N/C
ALARM DRAIN
Failure to Drain Condensate Flashes
-
ON
-
-
Flashes
N/O
N/C
N/C
* During an Alert/Alarm condition, the Process Diagram LED rotation ceases. The Fault based LED will “Flash” until the fault condition is resolved.
(1) Depress the (RESET) button to silence the Audible Alarm. The Fault Condition will remain visible in the VFTD text window until corrected.
(2) The Refrigeration Compressor will remain “”OFF”” until the fault condition is corrected.
TROUBLESHOOTING GUIDE
I-Controller Level 3
VFTD READING
(Fault conditions)
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
ALERT AMBIENT TEMP
1. Poor ventilation
Ensure ventilation is adequate for heat load
(High Ambient Air Temperature)
Ensure compressor is not ventilated toward dryer
ALERT INLET AIR TEMP
1. No aftercooler on compressor
Install an aftercooler
(High Inlet Air Temperature)
2. Dirty aftercooler
Clean aftercooler
3. Poor Ventilation
Ensure ventilation is adequate for heat load
ALARM DEW POINT TEMP
1. Refrigerant leak
Have serviced by a qualified refrigeration
(High Dew Point Temperature)
technician
2. System Overload
Review ambient, inlet, and air flow conditions
3. Dirty Condenser
Blow dust out of condenser fins
SHUTDOWN LOW PRESSURE
1. Low ambient condition
Elevate ambient temperature
(Low Compressor Suction Pressure) 2. Refrigerant leak
Have serviced by a qualified refrigeration technician
3. Improper Hot Gas Bypass
Properly adjust HGBV
Valve setting
SHUTDOWN HIGH PRESSURE
1. Fan(s) not working
Check condenser fan function
(High Compressor
2. High ambient condition
Ensure ventilation is adequate for heat load
Discharge Pressure)
Ensure compressor is not ventilated toward dryer
3. System overload
Review ambient, inlet, and air flow conditions
SHUTDOWN MOTOR PROTECT
1. Motor overloads triggered
Check voltage. Check for short to ground
(Compressor Motor Overload)
2. Refrigerant leak
Have serviced by a qualified refrigeration technician
ALERT MAINTENANCE
1. Pre-set Maintenance interval
Blow dust out of condensers, verify drain function,
check pressure drop across dryer
ALARM DRAIN
1. Failure to discharge condensate Check automatic discharge line for closed hand
valve or kink in hose
(Failure to Drain Condensate)
Clean and rebuild drain valve
Verify power to valve with Push-to-Test button
Summary of Contents for CRN Series
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