Owner's manual

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Before deciding where to locate the unit, check to ensure the static inlet head (Fig. 7)
meets the minimum requirement of 0.5 metres and does not exceed the maximum
requirement stated.
The static outlet head (Fig. 6) must also be within the maximum requirement stated.
Hot Water Installations
If it is not possible to locate the pump in the preferred area due to site limitations and it is
necessary to position the unit in the loft, or in a position above the secondary tapping that
feeds the pump, then there is an increased risk of air locks. This risk must be eliminated.
The following measure is a suggestion that may overcome the problem:
A “U” bend or downward loop in the supply pipe to the pump of 350 mm depth before
rising to the pump should ensure the cylinder vents its air up the expansion pipe, not up the
pump feed (Fig. 8).
Note: Ensure water
surface is a minimum
of 200 mm above
highest point of inlet
pipework at all times to
prevent air locks.
Least Preferred Pump
Location (shaded
area). Pump located
above the hot cylinder
can increase the risk of
air locks.
Cont ...
Max. inlet head 6 m Min. inlet head 0.5 m
Negative head
200 mm min
350 mm min
Max. outlet head 6 m
least preferred area
Fig. 8