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Compressor Controller (CC1) Module
Comm Failure
Displayed Text: CC1 Mod Comm Fail
Trigger:
Communication with the CC1 module has
failed. This means the reliability value
reported for the module is anything other
than 0 for at least 3 seconds
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 after
reliability value reported for the module is 0
for at least 5 seconds.
Evaporator EXV Module Comm Failure
Displayed Text: EEXV1 Mod Comm Fail
Trigger:
Communication with the EEXV1 module
has failed. This means the reliability value
reported for the module is anything other
than 0 for at least 3 seconds
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 after
reliability value reported for the module is 0
for at least 5 seconds.
Evaporator/Condenser Pump #1 or #2
Failure
Evap Pump1(or 2)Fault/Cond Pump1(or 2)
Displayed Text:
Fault
Trigger:
Unit is configured with primary and backup
pumps, pump #1 (or #2) is running, and the
pump control logic switches to pump #2 and
vice versa.
Action Taken:
Backup pump is used
Reset:
This alarm can be cleared manually via the
unit controller HMI or BAS command
Bad Demand Limit Input
Displayed Text:
Bad Demand Lim Input
Trigger:
Demand limit input out of range and
Demand Limit set point is set to Enable. For
this alarm out of range is considered to be a
signal less than 3mA or more than 21mA.
Action Taken:
Demand limit function and signal ignored
Auto clear when Demand Limit set point is
Reset:
set to Disable or demand limit input back in
range for 5 seconds.
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Bad LWT Reset Input
Displayed Text:
Bad LWT Reset Input
Trigger:
LWT Reset set point is Enable and LWT
reset input is out of range. For this alarm
out of range is considered to be a signal
less than 3mA or more than 21mA.
Action Taken:
LWT reset signal and reset function are
ignored
Reset:
Auto clear when LWT Reset set point is
Disable or LWT reset input back in range
for 5 seconds.
Circuit Alarms
Low Evaporator Pressure
Text:
C1 EvapPressLow
Trigger: Trigger 1:
This alarm will trigger when Freeze time is
exceeded and Circuit State = Start or Run.
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 = 70 – 0.906 x freeze error, limited to
a range of 20-70 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.
Trigger 2:
The alarm will trigger if Evaporator Press is less
than 0 kPa (0 psi) for longer than one second while
the circuit state is Run.
Trigger 3:
The alarm will trigger if Evaporator Press is less
than 0 kPa (0 psi) for longer than five seconds while
the circuit state is anything other than Run.
For any trigger condition, the alarm cannot trigger if
the evaporator pressure sensor fault is active or the
CC1 module communication is not working.
Action:
Rapid shutdown of unit and lock out from running
Reset:
This alarm can be cleared manually via the Unit
Controller HMI if the evaporator pressure is above 0
kPa (0 psi).
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