Stuart Turner Monsoon U1.5 bar Twin - Manual (Page 6)

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2.26 Non-preferred pump location: 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 measures are suggestions 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. 3).
Table 1
Model Max.
inlet
head
Max.
outlet
head
U1.5
8 m 8 m U2.0
U3.0
U4.0
12 m 12 m
U4.5
2 PUMP LOCATION - TWIN PUMP
Fig. 3
Max. inlet head (see table 1) Min. inlet head
0.5
m
hot water
services
least preferred area
200
mm
min
350
mm
Max. outlet head (see table 1)
Negative head
Fig. 4
Max. static inlet pressure see table 1