McQuay AWS User Manual

KOMAC00607-09EN 39
Trigger: Sensor shorted or open
Action Taken: Rapid stop all circuits
Reset: This alarm can be cleared manually via the keypad, but only if the sensor is
back in range.
Leaving Evaporator Water Temperature Sensor Fault #1
Alarm description (as shown on screen): Evap LWT Sens#1 Fault
Trigger: Sensor shorted or open
Action Taken: Rapid stop of circuits 1 and 2
Reset: This alarm can be cleared manually via the keypad, but only if the sensor is
back in range.
Leaving Evaporator Water Temperature Sensor Fault #2
Alarm description (as shown on screen): Evap LWT Sens#2 Fault
Trigger: Sensor shorted or open
Action Taken: Rapid stop of circuits 3 and 4
Reset: This alarm can be cleared manually via the keypad, but only if the sensor is
back in range.
AC Comm Failure
Alarm description (as shown on screen): AC Comm. Fail
Trigger: Communication with the I/O extension module has failed. Section 3.1
indicates the expected type of module and the address for each module.
Action Taken: Rapid stop of all running circuits.
Reset: This alarm can be cleared manually via the keypad when communication
between main controller and the extension module is working for 5 seconds.
Outdoor Air Temperature Sensor Fault
Alarm description (as shown on screen): OAT Sensor Fault
Trigger: Sensor shorted or open and Low Ambient Lockout is enabled.
Action Taken: Normal shutdown of all circuits.
Reset: This alarm can be cleared manually via the keypad if the sensor is back in
range or Low Ambient Lockout is disabled.
External Alarm
Alarm description (as shown on screen): External Alarm
Trigger: External Alarm/Event input is open for at least 5 seconds and external
fault input is configured as an alarm.
Action Taken: Rapid stop of all circuits.
Reset: Auto clear when digital input is closed.
Emergency Stop Alarm
Alarm description (as shown on screen): Emergency Stop Switch
Trigger: Emergency Stop input is open.
Action Taken: Rapid stop of all circuits.
Reset: This alarm can be cleared manually via the keypad if the switch is closed.
Unit Events
The following unit events are logged in the event log with a time stamp.
Entering Evaporator Water Temperature Sensor Fault
Event description (as shown on screen): EWT Sensor Fail
Trigger: Sensor shorted or open
Action Taken: Return water reset cannot be used.

McQuay AWS Specifications

General

Brand	McQuay
Model	AWS
Category	Chiller
Language	English