General Requirements; Location Of The Electromax; Water Supply - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

3.0 General Requirements

3.1 Location of the Electromax

The Electromax must not be sited outside or
in any location where it could be exposed to
the weather. It must be installed in a dry and
frost free environment.
The Electromax must be vertically mounted
on a flat, level surface capable of supporting
the "full" weight of the unit. When full the unit
weighs a total of 256kg.
The location chosen must allow the discharge
pipe from the unvented cylinder safety
valves to be correctly installed. Domestic hot
water pipe runs should be kept as short as
possible for maximum economy. Sufficient
access must be allowed around the unit to
allow removal of the front and top panels for
servicing and maintenance of the system.
Refer to Diagram 1, page 6 for details of
recommended minimum clearances.
An installation template is supplied with the
unit to aid in location and layout of pipework
connections.

3.2 Water supply

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 be assessed and the water
supply be 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 water supply
pipe should be in 22mm OD (copper) or
25mm OD (Blue MDPE). The minimum mains
water supply requirements should be 1.0 bar
and 20 litres per minute flowrate. At these
values outlet flowrates may be poor if several
outlets are used simultaneously, the higher
the available pressure and flowrate the better
the system performance will be.
The Electromax unvented cylinder has
an operating pressure of 3.5 bar which is
controlled by the Cold Water Combination
Valve. The Cold Water Combination Valve
can be connected to a maximum mains
supply pressure of 16 bar. The water supply
must be of wholesome water quality (Fluid
Category 1 as defined by the Water Supply
Regulations 1999).
In some areas of the UK the water supply
may have a high level of natural hardness.
Whilst this is not detrimental to the quality
of the water, in water heating systems the
calcium carbonate which causes the water's
"hardness" can precipitate onto hot surfaces
and in time adversely affect hot water
performance. If the temporary hardness of
the cold water mains supply exceeds 200mg/l
(check with your Water Supply Company) it
is recommended that some form of water
treatment is considered. Any device selected
must be suitable for use in unvented water
heating systems and not unduly affect the
flow rate capacity to the Electromax cylinder,
consult the manufacturer of the device for
details.
Installation & Servicing Instructions 9