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Water Supply
Please bear in mind that the mains water supply to the
property will be supplying both the hot and cold water
requirements simultaneously.
It is recommended that the maximum water demand
is assessed and the water supply checked to
ensure this demand can be satisfactorily met.
Note: A high mains water pressure will not always
guarantee high flow rates.
Wherever possible the mains supply pipe should be
22 mm. We suggest the minimum supply requirements
should be 0.15 MPa (1.5 bar) pressure and 20 litres
per minute flow-rate. However, at these values outlet
flow rates may be poor if several outlets are used
simultaneously. The higher the available pressure and
flow rate the better the system performance.
The cylinder has an operating pressure of 0.30 MPa
(3.0 bar) which is controlled by the cold water
combination valve assembly. The cold water
combination valve assembly can be connected to a
maximum mains pressure of 1.6 MPa (16 bar).
IMPORTANT INSTALLATION NOTE:
WHERE THE INLET SUPPLY TO THE PRESSURE
REDUCING VALVE (PRV) IS ROUTED THROUGH A
HEATED SPACE AND IS FITTED WITH A CHECK VALVE
OR OTHER FITTING THAT WOULD PREVENT BACK
FLOW, HIGH PRESSURES CAN BE EXPERIENCED IN
THE INLET PIPE DUE TO WARMING THAT CAN CAUSE
DAMAGE TO THE PRV OR OTHER FITTINGS ON THE
INLET SUPPLY.
IN THESE CIRCUMSTANCES, THE INSTALLATION
OF A MEANS TO ACCOMMODATE EXPANSION AND
THUS LIMIT THE PRESSURE RISE IN THE INLET PIPE
IS RECOMMENDED. REFER TO THE INSTALLATION
SECTION FOR FURTHER DETAILS.
Outlet/Terminal Fittings (Taps, etc.)
The cylinder can be used with most types of terminal
fittings. It is advantageous in many mixer showers to
have balanced hot and cold water supplies. In these
instances a balanced cold water connection is available
on the cold water combination valve assembly (see
Fig. 5, page 11). Outlets situated higher than the
cylinder will give outlet pressures lower than that at
the heater, a 10 m height difference will result in a 1
bar pressure reduction at the outlet. All fittings, pipe
work and connections must have a rated pressure of
at least 6 bar at 80 °C.
4
Limitations
The cylinder should not be used in association with
any of the following:
•
Solid fuel boilers or any other boiler in which the
energy input is not under effective thermostatic
control, unless additional and appropriate safety
measures are installed.
•
Ascending spray type bidets or any other class 1
back siphonage risk requiring that a type A air gap
be employed.
•
Steam heating plants unless additional and
appropriate safety devices are installed.
•
Situations where maintenance is likely to be
neglected or safety devices tampered with.
•
Water supplies that have either inadequate pressure
or where the supply may be intermittent.
•
Situations where it is not possible to safely pipe
away any discharge from the safety valves.
•
In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter that
could block the strainer, unless adequate filtration
can be ensured.
•
In areas where the water supply contains chloride
levels that exceed 250 mg/L.
Checklist
•
Unvented cylinder
•
Cold control pack
-
Tundish
-
3.5 bar Pressure Reducing Valve
-
6 bar Pressure relief valve
-
3 port motorised diverter valve
-
Tool - Element spanner
-
Expansion vessel 18 L (210L)
-
Expansion vessel 24 L (250L & 300L)
-
Signal cable 13 m
-
Compression nuts & olives
•
Literature pack
-
Installation manual
-
Warranty registration card
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