EN - 31
6.14 Minimum desuperheat discharge fault
●
Operation:
- This function monitors the compressor desuperheat temperature (prevents slugging).
- The minimum superheat temperature is calculated by the following equation: (discharge temperature
–
condensing temperature).
- The minimum superheating discharge threshold is stored in parameter P56.
- The fault is taken into account 15 minutes after the compressor is turned on. The compressor is stopped if desuperheat is
<
P56 and
superheat is
<
4 K for 1 minute.
●
If a fault occurs:
- Compressor turned off.
- Circuit fault output on.
- Circuit X discharge minimum superheat fault relay on optional board in On position.
- Circuit fault LED on console lit steadily.
Display:
●
Resetting:
- Press
RESET
to acknowledge the fault.
6.15 Electronic expansion valve fault
●
Operation:
- This input is used only if the optional electronic expansion valve is installed (P42 = Yes).
- The circuit is turned off when the input closes.
►
If
<
3 shutdowns occur in 24 hours
●
If a fault occurs:
- Compressor turned off.
- Circuit fault output off.
- Fault stored in fault memory.
- Circuit fault LED on console flashes.
- The number of faults over a 24 hour period is managed.
Display:
►
If
≥
3 shutdowns occur in 24 hours
●
If a fault occurs:
- Compressor turned off.
- Circuit fault output on.
- Fault stored in fault memory
- Circuit fault LED on console lit steadily.
- The number of faults over a 24 hour period is managed.
Display:
●
Resetting:
- If the number of faults in 24 hours < 3, the fault is automatically acknowledged after 120 seconds and the fault input opens.
- If the number of faults in 24 hours • 3, the fault is acknowledged via the
RESET
button on the console and the fault input opens.
6.16 Lubrication fault
●
Operation:
- This function checks for proper compressor lubrication by monitoring the oil pressure (HP-LP) over two separate stages.
• Fault after 1 minute
- The first check for this fault is taken into account 1 minute after the
compressor starts if HP-LP < 1 bar for 5 seconds (fault not
managed when compressor off).
●
If the first fault occurs at start-up :
- Compressor turned off.
- 16-minute time delay
- Circuit fault output off.
- Fault stored in fault memory
- Circuit X lubrication fault relay on optional board in Off position.
- Circuit fault LED on console off.
- Compressor restarted in short-cycle protection mode.
●
If another fault occurs after start-up:
- Compressor turned off.
- Circuit fault output on.
- Fault stored in fault memory.
- Circuit X lubrication fault relay on optional board in On position.
- Circuit fault LED on console lit steadily.
Display:
●
Resetting:
- The first fault is automatically acknowledged after 16 minutes.
- Press
RESET
to acknowledge the second fault.
C I R C U I T X F A U L T
M I N . D E S U P E R H E A T
E X P A N S . V A L V E F A U L T
X S T O P ( S ) I N 2 4 H
C I R C U I T X S T O P
E X P A N S . V A L V E F A U L T
C I R C U I T X S T O P
L U B R I C A T I O N F A U L T