Water Quality And Treatment; Water Connections - andrews MAXXflo Installation, Operation And Maintenance Manual

WATER QUALITY AND TREATMENT

When installing Andrews Water Heaters we would
recommend the inclusion of water treatment and that
a water treatment specialist is consulted to ensure
the selection of the most appropriate system for each
particular installation.
In hard water areas in particular, scale formation can occur
in all hot water systems and various factors can influence
this such as water temperature, amount of water used and
the quality of the local water supply. B.S. 7953 states that
provision should be made for water treatment where the
local water hardness exceeds 200 parts per million (14
degree Clark).
For further information please refer to our Technical Data
Sheet - T/D027 Water Quality and Treatment Data Sheet
(available from www.andrewswaterheaters.co.uk).

WATER CONNECTIONS

An unvented system must be fitted by an
approved installer.
The pressure reducing valve C1 will regulate the mains
water pressure at 3.5 bar (provided there is sufficient
mains water pressure available). The maximum test
pressure should be 6 bar. The expansion vessel C3 supplied
is suitable for the stored volume of the heater and a
comparative pipe work system.
Expansion Vessel
We do not recommend the use of galvanised pipework
due to issues such as galvanic attack (British Standard
BS6644). The MAXXflo has a number of copper and brass
components.
The cold water connection and the hot water connection
can be found on the top of the appliance (see pages 8 &
9). An extra connection is available for the benefit of a
circulation line. Please note that a stop valve should be
fitted in the circulation line.
The MAXXflo range of storage water heaters are designed
to work from a mains fed unvented system. An unvented kit
to regulate the cold feed is supplied with each heater and
should be installed as per Fig 1a and 1b plus drawings on
pages 8 & 9.
The temperature and pressure relief valves are supplied
factory fitted for external connection to a tundish
(supplied) and suitable drain. The MAXXflo can also
operate on vented systems providing the minimum water
pressure is one bar.
Fig 1A
MAXXflo Water Heater
INSTALLATION • SECTION 3
For systems with larger pipe volumes or additional
storage, expansion vessels with more capacity are
available.
Caution : When connecting pipe work to the top of
the appliance, avoid using excessive force when
tightening the fitting. Use another set of grips to
apply an opposite force during final tightening.
Fig 1B
11 11