Stuart Turner Monsoon S1.5 bar Twin - Manual (Page 6)

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2.26 Non-Preferred Pump Location: The pump must be located with at least
0.5 metres 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 for Twins and Fig. 3 for Singles).
2 LOCATION - SINGLE PUMP
Positive Duty Single Pump System
Fig. 4
Outlet head must be
below bottom of cold
water tank and able
to pass a minimum
of 0.6 l/min of gravity
flow
Max. static inlet pressure
14
m
Max. inlet head
14
m
Min. inlet head
0.5
m
Max. inlet head
14
m
Min. inlet head
0.5
m
hot water
services hot water
services
least preferred area least preferred area
200
mm
min 200
mm
min
350
mm
min 350
mm
min Fig. 2 (Twin Pump) Fig. 3 (Single Pump)