Stuart Turner Boostamatic2/T12-2 - Manual (Page 18)

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Dry Run Protection
This pump is fitted with a safety control circuit, which will detect the following fault
condition:

Dry running caused by water starvation to the pump.
Should the pump run out of water it will stop as part of a “protective logic sequence”,
detailed below.
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 remains 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 contact
the Pump Assist team on 0844 98 000 97.
Flow Switch Circuit Test
1. First confirm visually that the flow switch reed clamp have not been dislodged during
handling or installation. The clamp must be fully located within the flow switch body
groove as shown.
2. To carry out the following test you will need to obtain
a magnet, a typical fridge magnet is suitable.
3. Ensure the power supply is switched on.
4. Position the magnet directly in front of the reed
clamp as shown. If pump does not start, then
slowly move the magnet up and down to a
position that exceeds the extent of the reed
clamp. The pump should instantaneously start
at some point during this extent of movement.
If this does not happen, this indicates a possible
fault with the reed switch or the P.C.B which is
located within the terminal box. These should be
checked electrically. Consult Stuart Turner for further instructions.
Fig. 21
Groove
Body
Reed
Clamp
Magnet