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Evaporator/Condenser Water Freeze
Protect
Evap Water Freeze
Displayed Text:
Cond Water Freeze
Trigger:
LWT or EWT equal to or less than Freeze
Protect set point for a time at least as long
as the evaporator recirculation time. If the
sensor fault is active for either LWT or EWT,
then that sensor value cannot trigger the
alarm.
Action Taken:
Rapid shutdown unit and lock out unit from
running
Reset:
This alarm can be cleared manually via
the unit controller HMI, but only if specific
LWT and EWT are both above the specified
Freeze Protect set point or have a sensor
fault (meaning the temperature reading is
not valid).
Evaporator Water Temperatures Inverted
Displayed Text:
EvapWaterTempInverted
Trigger:
All of the following are true for at least 60
seconds:
• Unit is in Run state
• Evap EWT < Evap LWT – 1°C
• EWT sensor fault not active
• LWT sensor fault not active
Action Taken:
Normal shutdown unit and lock out unit
from running
Reset:
This alarm can be cleared manually via the
unit controller HMI or via BAS command.
Evaporator/Condenser LWT Sensor
Fault
Evap LWT SenFault/
Displayed Text:
Cond LWT SenFault
Trigger:
If any of the following occur:
• Resistance value is < 340 Ω
• Resistance value is > 300k Ω
• Reliability value reported for input is
anything other than 'NoFault'
Action Taken:
Rapid shutdown unit and lock out unit from
running
Reset:
This alarm can be cleared manually via the
unit controller HMI or BAS command if the
following are true:
• Resistance value is from 340 Ω to
300k Ω
• Reliability value reported for input is
'NoFault
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Evaporator/Condenser EWT Sensor
Fault
Evap EWT SenFault/
Displayed Text:
Cond EWT SenFault
Trigger:
If any of the following occur:
• Resistance value is < 340 Ω
• Resistance value is > 300k Ω
• Reliability value reported for input is
Action Taken:
Normal shutdown unit and lock out unit from
running
Reset:
This alarm can be cleared manually via the
unit controller HMI or BAS command if the
following are true for at least five seconds:
• Resistance value is from 340 Ω to
• Reliability value reported for input is
External Alarm
Displayed Text: External Alarm
Trigger:
External alarm input is open for at least 1
second.
Action Taken:
Rapid shutdown unit and lock out unit from
running
Reset:
Auto clear when external alarm input is
closed for 5 seconds.
Emergency Stop
Displayed Text: Emergency Stop Switch
Trigger:
Emergency Stop input is off for at least 1
second.
Action Taken:
Rapid shutdown unit and lock out unit from
running
Reset:
This alarm can be cleared manually via the
unit controller HMI or via BAS command
after the emergency switch input is on for at
least 5 seconds.
Unit Ground Fault Protection
Displayed Text: Unit Ground Fault
Trigger:
All of the following are true:
• Ground Fault Protection Option set
• Ground Fault Relay input is off for one
Action Taken:
Rapid shutdown unit and lock out unit from
running
Reset:
Auto reset when Ground Fault Relay input
is on for five seconds
37
IOM 1264-1 • NAVIGATOR
a
larms and
anything other than 'NoFault'
300k Ω
'NoFault'
point = Yes
second
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