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SITING THE UNIT
This product must be installed vertically on a fl at base that is capable of supporting the maximum-fi ll
weight of the cylinder. For each metre an outlet is above the Alpha, the supply pressure of the hot water
will be reduced by 0.1 bar.
The minimum recommended cupboard size is 650mm square as the product diameter can vary (capacity
and confi guration dependant) between 475mm to 580mm. This is to ensure that there is access to the
cylinder safety controls/immersion heaters and for future valve maintenance or replacement during
service. Therefore, please ensure all connections are outward facing towards a door or similar opening for
this purpose.
Areas subject to freezing should be avoided. If the cylinder is sited outside of a heated area of the
dwelling, such as a garage or outbuilding, ensure the provision of adequate frost protection, such as insu-
lation of exposed pipework. Pipe lengths must be kept to a minimum to ensure minimal losses.
COLD WATER INLET CONTROL SET
Included in your unvented safety components is a multibloc inlet control group. This single unit is
standard issue for many unvented water systems, and comprises of many diff erent safety valves, housed
into a single brass casting. This is detailed as follows:
Expansion Relief
(Discharges to Tundish)
Cold water supply to
Alpha Cylinder
Cold water mains in
3 Bar Pressure Reducing
Valve and line strainer
Connection to
Expansion Vessel
3 Bar balanced
Cold Feed
WATER SUPPLY
We recommend that the maximum on-site water demand be assessed and the water supply be tested to
ensure it meets the following requirements.This should be sourced from mains water only - your warranty
does NOT include the use of wells or bore holes as a water supply.
It must be noted that a high mains water pressure does NOT always guarantee a high fl ow rate. Ensure a
working (not static) condition site pressure reading is taken. The minimum mains water supply requirements
should be 0.15MPa (1.5 bar) working pressure, and a 20 litres per minute fl ow rate available. Where mains
inlet pressures may exceed 10 bar, an additional upstream pressure reducing device should be fi tted in
addition to the cold water inlet set provided by UK Cylinders.
The mains supply pipe-work should be a minimum of 22mm. This could warrant the replacement of any
existing 1/2” (15mm) cold mains pipe-work.
The water supply must be of a wholesome water quality, defi ned as Fluid Category 1 in the Water Supply
Regulations 1999. In areas of hard water content (CaCO3) greater than 200ppm, treatment should be
installed.
CHANGE OF WATER SUPPLY
The changing or alternation of one water supply to another can be detrimental on the operation and/or life
expectation of the product and its accessories. Where a water supply changeover occurs, e.g. a rainwater
tank supply, bore water supply, desalinated water supply, public reticulated water supply or water brought
in from another supply, then water chemistry information should be sought, or should be tested to ensure
the supply will meet the requirements given in these guidelines for our manufacturer’s warranty to apply.
