Installation - Plumbing; Cold Water Combination Valve; Secondary Expansion Vessel - Heatrae Sadia ElectroMax Installation & Servicing Instructions Manual

5.0 Installation - Plumbing

Pipe connections to the Electromax must be
Solder connections directly to the unit must
not be made as the heat may damage the
insulation materials used. Damage caused
proximity to the unit will not be covered by
the warranty. Solder connections may be
used elsewhere in the system away from the
residue is removed following installation.

5.2 Cold Water Combination Valve

The Cold Water Combination Valve can be
connected anywhere on the cold water mains
supply prior to the Electromax unit, however
it must be possible to connect the secondary
system Expansion Vessel between this
valve and the cold inlet connection of the
unit. Whilst it is often more convenient to
do so, there is no requirement to site the
valve close to the unit, it can be located at
a point remote from the unit if this is more
convenient. However, ensure the discharge
from the Expansion Valve (see Diagram 10)
can be correctly installed. The Expansion
Valve connection must not be used for any
other purpose.
The Cold Water Combination Valve is installed
as a complete one-piece unit. The valve
incorporates an Isolating Valve, a Pressure
Reducer, a Strainer, an Expansion Valve
and a single Check Valve. The valve can be
however, ensure the valve is installed with
side of the brass body) pointing towards the
Electromax unit.
14 Installation & Servicing Instructions
Diagram 10 Cold Water Combination Valve
EXPANSION VALVE
COLD MAINS
CONNECTION
(22mm)
PRESSURE
REDUCING
VALVE
HOUSING
PRESSURE
REDUCING
VALVE
CARTRIDGE (3.5 bar)

5.3 Secondary Expansion Vessel

The Secondary (DHW) Expansion Vessel is
to the cold water supply to the Electromax
to accommodate any water expansion that
results from heating the water inside the
between the Cold Water Combination Valve
and the cold inlet of the Electromax cylinder
(see Diagram 5, page 10).
The Expansion Vessel must be adequately
supported, a wall mounting bracket is
supplied for this purpose. The location of the
Expansion Vessel should allow access for
maintenance. This will entail access to the
air valve on top of the unit to check and, if
necessary, re-charge the vessel pre-charge
pressure. The vessel pre-charge pressure
is 3.5 bar.
EXPANSION VALVE
OUTLET (15mm)
OUTLET
CONNECTION
(22mm)