Daikin Trailblazer AGZ030E-070E Installation, Operation And Maintenance Manual page 103

EXV Module 2 Comm Failure
Trigger: Expansion Valve Type = Electronic and
communication with the I/O extension module has failed.
Action Taken: Rapid stop of circuit 2 .
Reset: This alarm can be cleared manually via the keypad or
BAS command when communication between main controller
and the extension module is working for 5 seconds or
Expansion Valve Type = Thermal.
Unit Problem Alarms
Evaporator Pump #1 Failure
Trigger: Unit is configured with primary and backup pumps,
pump #1 is running, and the pump control logic switches to
pump #2.
Action Taken: Backup pump is used.
Reset: This alarm can be cleared manually via the keypad or
BAS command.
Evaporator Pump #2 Failure
Trigger: Unit is configured with primary and backup pumps,
pump #2 is running, and the pump control logic switches to
pump #1.
Action Taken: Backup pump is used.
Reset: This alarm can be cleared manually via the keypad or
BAS command.
Unit Warning Alarms
External Event
Trigger: External Alarm/Event input is open for at least 5
seconds and external fault is configured as an event.
Action Taken: None.
Reset: Auto clear when digital input is closed.
Bad Demand Limit Input
Trigger: Demand limit input out of range and demand limit
is enabled. For this alarm out of range is considered to be a
signal less than 3mA or more than 21mA.
Action Taken: Cannot use demand limit function.
Reset: Auto clear when demand limit disabled or demand limit
input back in range for 5 seconds.
Bad LWT Reset Input
Trigger: LWT reset input out of range and LWT reset is
enabled. For this alarm out of range is considered to be a
signal less than 3mA or more than 21mA.
Action Taken: Cannot use LWT reset function.
Reset: Auto clear when LWT reset is disabled or LWT reset
input back in range for 5 seconds.
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Evaporator EWT Sensor Fault
Trigger: Sensor shorted or open for longer than one second
Action Taken: None.
Reset: Auto clear when the sensor is back in range.
Circuit Fault Alarms
PVM/GFP Fault
Trigger: Power Configuration = Multi Point and circuit PVM/
GFP input is open for longer than one second
Action Taken: Rapid stop circuit.
Reset: Auto reset when input is closed for at least 5 seconds
or if Power Configuration = Single Point.
Low Evaporator Pressure
Trigger:
This alarm should trigger when Freeze time is exceeded, Low
Ambient Start is not active, and Circuit State = Run. It should
also trigger if Evaporator Press < 137.9 KPA (20 psi) and
Circuit State = Run for longer than 1 second.
Freezestat logic allows the circuit to run for varying times at low
pressures. The lower the pressure, the shorter the time the
compressor can run. This time is calculated as follows:
Freeze error = Low Evaporator Pressure Unload –
Evaporator Pressure
Freeze time =
60 – (freeze error/6.895), limited to a range of 20 to 60
seconds
When the evaporator pressure goes below the Low Evaporator
Pressure Unload set point, a timer starts. If this timer exceeds
the freeze time, then a freezestat trip occurs. If the evaporator
pressure rises to the unload set point or higher, and the freeze
time has not been exceeded, the timer will reset.
The alarm cannot trigger if the evaporator pressure sensor fault
is active.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually via the keypad if
the evaporator pressure is above 137.9 KPA (20 PSI).
High Condenser Pressure
Trigger: Condenser Pressure > High Condenser Pressure set
point for longer than one second.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually via the controller
keypad.
Mechanical Low Pressure Switch
Trigger: The alarm is triggered if all of the following are true
for at least 40 seconds:
• Circuit State is Run and MLP Switch input is off
103 IOM 1207-6 • TRAILBLAZER
Alarms
MODEL AGZ CHILLERS
®