Stuart Turner Monsoon U1.5 bar Twin Installation, Operation & Maintenance Instructions Manual page 34

13.2 Dry Run Protection
This pump is fitted with a PCB that will detect the following fault conditions:
•
Should the pump run out of water it will stop as part of a "protective logic
sequence".
The fault should be rectified before re-starting the pump. Check that there is
sufficient water supply to the pump and also ensure that all terminal fitting outlets
are closed.
Protective Logic Sequence: If water starvation occurs and the power supply to
the pump remains uninterrupted, the pump controller will perform the following
protective sequence.
1. If the pump detects water starvation, it will stop operation after a 1 minute
period.
2. The pump will remain in the off condition for a period of 5 minutes.
3. The pump will then re-start and if the water starvation condition 0remain
present, the pump will then stop operation after a 1 minute period.
4. The pump will remain in the off condition for a period of 5 minutes.
5. The pump will then re-start and if the water starvation condition remains
present, the pump will then stop operation after a 1 minute period.
6. The pump will remain in the off condition for a period of 5 minutes.
7. The pump will then re-start and if the water starvation condition remains
present, the pump will then stop operation after a 1 minute period.
8. After three consecutive resets are performed the pump will remain in the
off condition indefinitely.
9. To restart the pump, the power supply should be first isolated for a period
of at least 10 seconds before switching on again.
If the pump fails to operate normally after three attempts to re-start, then please
consult Stuart Turner TechAssist +44 (0) 800 31 969 80.
Dry running caused by water starvation to the pump.
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