Daikin Navigator WWV - Mechanical High Pressure Switch Alarm; High Discharge Temperature Alarm; High Oil Pressure Difference Alarm

45
IOM 1264-4
WWW.DAIKINAPPLIED.COM
OPERATION
High Discharge Temperature
Displayed Text: C1 DiscTempHigh
Trigger: The following are true for one second:
Circuit state is Start, Run, or Shutdown
Discharge Temperature > High Discharge Tem-
perature set point
discharge temperature sensor fault is not active
Action Taken: Normal shutdown of unit and lock out from
running
Reset: This alarm can be cleared manually via the Unit
Controller HMI or via BAS command
High Oil Pressure Di󰀨erence
Displayed Text: C1 Oil PD High
Trigger: Circuit is in the Run state and Oil Pressure Dif-
ference > High Oil Pressure Di󰀨erence value for
a time longer than High Oil Pressure Di󰀨erence
Delay set point
High Oil Pressure Di󰀨erence value is calculated
as shown Figure 27
Operating PD = Condenser Pressure – Evapora-
tor Pressure
Minimum for High Oil Pressure Di󰀨erence = High
Oil Pressure Di󰀨erence set point
Maximum for High Oil Pressure Di󰀨erence = High
Oil Pressure Di󰀨erence set point + 100kPa
Action Taken: Rapid shutdown of unit and lock out from running
Reset: This alarm can be cleared manually via the
Unit Controller unit controller HMI or via BAS
command
Figure 27: High Oil Pressure Dierence Values
Oil Feed Loss
Displayed Text: C1 Oil Feed Loss
Trigger: The following are true for 20 second:
Oil Presence Sensor setting is ‘Yes’
Compressor is running
Oil Presence Sensor input is o󰀨
Action Taken: Rapid shutdown of unit and lock out from running
Reset: This alarm can be cleared manually via the Unit
Controller HMI
High Motor Temperature
Displayed Text: C1 Motor Temp High
Trigger: Compressor VFD reports motor overheat alarm,
which is bit 7 in the Alarm 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 unit controller HMI when compressor
has been o󰀨 for at least 5 minutes. When the
alarm is cleared in the unit controller, the com-
mand to clear the fault in the VFD will be sent
No Pressure Change At Start
Displayed Text: C1 No Press Chg Start
Trigger: After start of compressor, at least a 7 kPa drop
in evaporator pressure or 25 kPa increase in
condenser pressure has not occurred within 40
seconds
Action Taken: Rapid shutdown of unit and lock out from running
Reset: This alarm can be cleared manually via the Unit
Controller unit controller HMI or BAS command
No Pressure At Start
Displayed Text: C1 No Press At Start
Trigger: All of the following must be true to trigger:
Circuit start requested
Either Evaporator Pressure or Condenser Pres-
sure are less than 35 kPa (5.1 psi)
Action Taken: Abort start of circuit and lock out from running
Reset: This alarm can be cleared manually via the Unit
Controller unit controller HMI or BAS command
Low Discharge Superheat
Displayed Text: C1 Disc SH Low
Trigger: If both of the following are true for at least 30
minutes, the alarm is triggered:
Circuit state is not O󰀨
DSH < Low DSH Limit set point
Action Taken: Normal shutdown of unit and lock out from run-
ning on the third occurrence
Reset: This alarm can be cleared manually via the Unit
Controller HMI or via BAS command
High Oil Pressure
Difference Value
Operang PD
1000kPa
1500kPa
Min value
Max value