Stuart-turner Techflo TP 60TNH User Manual download pdf (Page 8)

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2.32 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 measure is a suggestion that may overcome the problem:

In this application only use an Essex or Techflow side entry flange, then fit 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 (Figs. 6 & 7).

Max. inlet head 6 m

Min. inlet head 0.5 m

hot water

services

Negative

head

200 mm

min

350 mm

Max. outlet head 6 m

least preferred area

Fig. 7 - Twin Pump

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. 6 - Single Pump

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Stuart-turner Techflo TP 60TNH User Manual Page 8