Stuart Turner U2.3 bar Twin - Manual (Page 15)

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e) Replenish air charge if required by injecting air into the vessel via the
Schrader valve using a car or bicycle pump, ensuring a system outlet valve
(tap) remains open during this procedure to allow the vessel to exhaust
any excess water.
f) Close all system taps, open hot and cold inlet pump isolating valves, turn on
electrical power.
g) After maintenance is completed refer to Section 5 Commissioning for
instructions on re-starting pump.
6.15 Water scale: As water is heated scale deposits are released in areas of hard
water, scale can cause the mechanical seal to stick if left without use for long
periods. The pump must be run for at least 5 minutes every four weeks to
“exercise” all working parts. Run on cool water. See Section 7 - Technical
Specification for note on water temperature. This particularly applies to guest
bathrooms used infrequently.
6.16 Cleaners, Disinfectants and Descalents:
Acid based descalents and aggressive cleaning agents must not
come into contact with the pump. The pump must be removed from
the system prior to the use of these products. The system should be
flushed to remove all chemicals before the pump is re-connected.
If in any doubt as to the suitability of the chemical solutions, please
contact our helpline.
d) Check air charge at Schrader valve (Fig. 12) using a tyre pressure gauge.
Model
Vessel Pressure
kPa bar psi
All models 90 0.9 13
Fig. 12
Pressure vessel
Schrader valve