OPERATION
NAVIGATOR WWV/TWVDAIKIN APPLIED
44
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
Reset:
Auto clear when Demand Limit set point is set to
Disable or demand limit input back in range for 5
seconds
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 ignored
Reset: Auto clear when LWT Reset set point is Disable or
LWT Reset input back in range for 5 seconds
RapidRestore Module Comm Failure
Displayed
Text:
RR Module Comm Fail
Trigger: RapidRestore set point is set to ‘Yes’ and com-
munication with the RapidRestore module has
failed. This means the reliability value reported for
the module is anything other than 0 for at least 3
seconds
Action Taken: RapidRestore functionality will be disabled while
the module is not communicating since an input
on the module is required in order to enable the
functionality
Reset: This alarm will automatically clear after communi-
cation is restored for at least 5 seconds
Circuit Alarms
Low Evaporator Pressure
Text: C1 EvapPressLow
Trigger: Trigger 1 - This alarm will trigger when Freeze time is ex-
ceeded 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 – Evapo-
rator 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 Evapo-
rator 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 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 Evap Press is less than 0
kPa (0 psi) for longer than 5 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 mod-
ule 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 evap press is above 0 kPa (0 psi)
High Condenser Pressure
Text: C1 CondPressHigh
Trigger: Saturated Condenser Temp > Max Saturated Con-
denser Value for time longer than High Condenser
Pressure Delay set point. Cannot trigger if CC1
module commination is not working
Action Taken: Rapid shutdown of unit and lock out from running
Reset: This alarm can be cleared manually via the unit
controller HMI if Saturated Condenser Temp ≤ Max
Saturated Condenser Value
Mechanical High Pressure Switch
Displayed Text: C1 MHP Switch
Trigger: At least 12 seconds elapsed since controller boot-
ed and compressor VFD reports Safe Stop alarm
or warning. The alarm is bit 30 in the Alarm word
and the warning is bit 30 in the Warning word from
the VFD
Action Taken: Rapid shutdown of unit and lock out from running
Reset: This alarm can be cleared manually via the Unit
Controller HMI. When alarm is cleared, command
to reset alarms should be sent to VFD
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