Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 76

Waterside Economizer Valve Fault
Alarm: Waterside Economizer Valve Fault
Displayed Text: WSE Valve Fault
Trigger: If the following conditions are true for 90
seconds the alarm should be triggered:
• WSE water valve 1 command = 100%
• WSE water valve 1 position < 90%
Or, if the following conditions are true for 90
seconds the alarm should be triggered:
• WSE water valve 2 command = 0%
• WSE water valve 2 position > 10%
In addition, if the valve position signals are
out of range as follows the alarm should be
triggered:
• valve 1 signal is out of range on high
side for one second
• valve 2 signal is out of range on low
side for one second
Action Taken: Disable and lock out chiller from running
Reset: This alarm can be cleared manually via the
controller HMI or BAS command.
Waterside Economizer Valve Problem
Alarm: Waterside Economizer Valve Problem
Displayed Text: WSE Valve Problem
Trigger: If the following conditions are true for 90
seconds the alarm should be triggered:
• WSE water valve 2 command = 100%
• WSE water valve 2 position < 90%
Or if the following conditions are true for 90
seconds the alarm should be triggered:
• WSE water valve 1 command = 0%
• WSE water valve 1 position > 10%
In addition, if the valve position signals are
out of range as follows the alarm should be
triggered:
• valve 1 signal is out of range on low
side for 1 second
• valve 2 signal is out of range on high
side for 1 second
Action Taken: Waterside Economizer disabled
Reset: This alarm can be cleared manually via the
controller HMI or BAS command.
IOM 1242-8 • PATHFINDER MODEL AWV CHILLERS
®
Circuit Alarms
Low Evaporator Pressure
Alarm: Low Evaporator Pressure
Text: Cn EvapPressLow
Trigger: When circuit state = Start and OAT ≥ -8°C, any of
the following can trigger:
• Evap Pressure < 0 kPa for 5 seconds
• Evap Pressure < -50 kPa for 2 seconds
When circuit state = Start and OAT < -8°C, any of
the following can trigger:
• Evap Pressure < 0 kPa for 20 seconds
• Evap Pressure < -50 kPa for 5 seconds
Note: for this condition where OAT is lower than
-8°C, the first two times any of the trigger conditions
are met in a day the circuit will only shut down and
the alarm will not trigger. On the third occurrence in
a day, the circuit will shut down and the alarm will
be triggered.
For first 5 minutes circuit state = Run, any of the
following can trigger:
• Evap Pressure < 0 kPa for 5 seconds
• Evap Pressure < -50 kPa for 2 seconds
• Evap Pressure < Low Pressure Unload set
point for 100 seconds
After circuit state = Run for 5 minutes, any of the
following can trigger:
• Evap Pressure < 30 kPa for 5 seconds
• Evap Pressure < -30 kPa for 2 seconds
• Evap Pressure < Low Pressure Unload set
point for time > Freeze Time
Where:
• Freeze Time = 70 – 0.906 x Freeze Error,
limited to range of 20-70 seconds
• Freeze Error = Low Evap Pressure Unload –
Evap Pressure
For any trigger condition, the alarm cannot trigger if
the evaporator pressure sensor fault is active.
Action
Rapid shutdown of circuit and lock out from running
Taken:
Reset: This alarm can be cleared manually via the Unit
Controller keypad.
Figure 76: Low Evaporator Pressure Fault Diagram
CIRCUIT
START
OAT ≥ -8°C
Evap Pressure < 0 kPa for 5
seconds
OR
Evap Pressure < -50kPa for
2 seconds
{
CIRCUIT
RUN
Evap Pressure < 0 kPa for 5
5 minutes
seconds
Evap Pressure < 30 kPa for
5 seconds
76
Alarms and Events
OAT< -8°C
First 2 occurrences for this
Evap Pressure < 0 kPa for
condition will shut down
20 seconds
circuit but do not trigger the
OR
alarm. Third occurrence in
Evap Pressure < -50kPa for
the day will trigger the alarm.
5 seconds
Evap Pressure < Low
Evap Pressure < -50kPa for Pressure Unload set point for
2 seconds 100 seconds
Evap Pressure < Low
Evap Pressure < -30kPa for
Pressure Unload set point for
2 seconds
freeze time
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