Stuart Turner PH 35 TS FL - Manual (Page 6)

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2.26 Non-Preferred Pump Location: The pump must be located with at least 1 metre
flooded suction at all times.
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 method will help to 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. 2).
2 LOCATION - BLENDED WATER INSTALLATION
2.27 Location: The pump must, for optimum performance, be sited as close as
possible to and never more than 4 metres from the HOT WATER cylinder. The
pump should always be sited BELOW the HOT WATER take-off from the cylinder.
Max. inlet head
14
m
Min. inlet head
1
m
350
mm
min.
200
mm
min.
Least preferred area
Fig. 2
hot water
services
Outlet head must be
below bottom of cold
water tank and able
to pass a minimum of
1 l/min of gravity flow
Fig. 3
Static inlet pressure 14
metres max
1
metre min