Baxi Solo 2 60 RS Installation And Servicing Instructions page 10

System Details - Page 10
Sealed Systems
SAFETY VALVE
A safety valve complying with the requirements of BS 6750
Part 1 must be fitted close to the boiler on the flow pipe by
means of a horizontal or vertically upward connection with
no intervening valve or restrictions and should be positioned
to facilitate testing. The valve should be pre-set and non-
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adjustable to operate at a pressure of 3 bar (45 lbf/in ). It
must be arranged to discharge any water or steam through a
pipe to a safe outlet position.
PRESSURE GAUGE
2
A pressure gauge of minimum range 0-4 bar (0-60 lbf/in )
with a fill pressure indicator must be fitted to the system,
preferably at the same point as the expansion vessel in an
easily visible position.
EXPANSION VESSEL
An expansion vessel complying with the requirements of BS
4814 must be fitted to the system by means of a connection
close to the inlet side of the circulating pump in accordance
with the manufacturers instructions, the connecting pipe
being unrestricted and not less than 15mm (½ in) nominal
size. The volume of the vessel should be suitable for the
system water content and the nitrogen or air charge
pressure should not be less than the system static head.
Further details of sealed system design can be obtained
from BS 5449: Part 1 and the British Gas publication entitled
'Specifications for Domestic Wet Central Heating Systems'.
FILLING POINT
A filling point and an approved stop valve to BS 1010 must
be fitted at low level and the method used for filling the
system should be approved by the local water undertaking.
For further details see BS 6798.
A method of replacing water lost from the system should be
provided either by means of a make up vessel of not more
than 3 litres (5 pints) capacity, mounted above the highest
point of the system, or by pre-pressurisation of the system.
A method of venting the system during filling and
commissioning must be provided by fitting automatic air
vents or by venting manually.
The hot water storage vessel must be of the indirect coil
type. All components used in the system must be suitable for
operation at 11 0°C (230°F) and at the pressure allowed by
the safety valve.
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