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30
LOW PRESSURE INSUFFICIENT
Logical variable : DBPn
Incident codes KP02 : n1
KP07 icon :
Description
Case ¶ : No compressor on circuit n is working. The liquid valve has been open for 2 minutes, but low pressure
remains lower than safety limits.
Case · : A compressor on circuit n has been operating for more than 2 minutes. The liquid valve is open and
the expansion valve bypass valve (if applicable) has been closed for 1 minute, but low pressure is
insufficient.
Reminder: The units with an expansion valve bypass valve are those fitted with the "all seasons"
option and thermostatic expansion valves.
Case ¸ : A compressor on circuit n has been operating for over 6 minutes, all other compressors in service on
the circuit have been operating for at least 2 minutes and insufficient low pressure is detected
Action
F If circuit n is not in operation, start-up has not been authorised. If it is in operation, it stops immediately.
F The fault is displayed on the screen.
F The remote fault report is delayed for 6 minutes.
Resetting
Case ¶ & · : Three automatic fault resets are allowed daily. After this, circuit n can only be restarted
after manual resetting.
Case ¸ : Resetting is manual.
Note : "Low pressure" failure counters TOBPn are all reset to zero daily at 6 pm, on condition that the
maximum number of faults authorised has not been reached.
Trouble-shooting Solution
Insufficient circuit load.
Malfunction of the liquid solenoid valve.
Malfunction of expansion valve.
Dehydrator clogged.
Complete the load.
Check solenoid valve operation.
Check expansion valve operation.
Change dehydrator.
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