Sealed Primary Systems - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

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.
Failure to flush and add inhibitor to the
system will invalidate the appliance
warranty.

3.5 Sealed Primary Systems

The Electromax boiler must be installed in a
sealed primary system. All necessary primary
system controls are supplied fitted to the
Primary System
Expansion Vessel
Primary System
Pressure Relief
Valve
Automatic
Bypass Valve
Primary
Flow
Primary
Isolating
Return
Valves - to Radiators
or Undefloor System
Diagram 6 System Schematic - Primary Circuit
Electromax. The sealed system expansion
vessel fitted has a capacity of 12 litres
which, as a general guide, will be suitable
for a heating system of up to 107 litres. If
in doubt the total primary system volume
must be calculated to determine if additional
expansion volume is required.
The Electromax initial primary system cold
fill pressure is 1.0 bar. The expansion vessel
size = 0.11 x the total system volume. The
boiler and pipework within the Electromax
hold approx. 2 litres of water, therefore
additional system expansion volume will
only be necessary for systems that exceed
107 litres.
The Electromax boiler incorporates an
automatic air vent at its highest point (fitted
to the pump housing, see Diagram 6). If any
primary pipework is routed above the level
of the Electromax additional air vents must
be fitted to the highest points of the flow and
return pipes and at any point where air is
likely to collect.
An automatic bypass valve is fitted to the
Electromax to allow thermostatic radiator
valves to be fitted to the system.
Automatic
Circulating
Air Vent
Pump
Primary System
Drain Valve
Installation & Servicing Instructions
Electromax Housing
Primary System
Unvented System
Electric Boiler
Filling Loop
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