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Cont ...
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 Singles and Fig. 3 for Twins).
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. inlet head 14 m
Min. inlet head 0.5 m
Max. static inlet pressure 14 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. 3 (Twin Pump)Fig. 2 (Single Pump)
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