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.
For optimum performance after installation the
Electromax boiler and its associated central
heating system must be flushed in accordance
with the guidelines given in BS 7593:1992
"Treatment of water in domestic hot water
central heating systems". This must involve the
use of a proprietary cleanser, such as GE Betz
Sentinel X300 or X400, Fernox "Superfloc"
or Salamander system cleanser. Follow the
manufacturer's instructions to ensure correct
cleansing of the system.
For long term protection against corrosion
and scale, after flushing, the system should
be dosed with an inhibitor such as GE Betz
Sentinel X100, Fernox MB-1 or Copal or
Salamander System Inhibitor in accordance
with the guidelines given in BS 7593:1992.
Installation & Servicing Instructions 9