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

5.0 Installation - Plumbing

5.1 Pipe fittings

Pipe connections to the Electromax must be
made using 22mm compression type fittings.
Solder connections directly to the unit must
not be made as the heat may damage the
insulation materials used. Damage caused by
heat applied to solder fittings in close proximity
to the unit will not be covered by the warranty.
Solder connections may be used elsewhere
in the system away from the Electromax unit.
Use water soluble flux for making soldered
joints and ensure any flux 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, page 14) 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 a pressure reducer, a strainer,
an expansion valve and a single check valve.
The valve can be fitted in any orientation to
suit the installation, however, ensure the valve
is installed with the direction of flow arrows
(stamped on the side of the brass body)
pointing towards the Electromax unit.
14 Installation & Servicing Instructions
Expansion valve
Cold mains
connection
(22mm)
Diagram 10 Cold Water Combination Valve

5.3 Secondary Expansion Vessel

The Secondary (DHW) expansion vessel is
supplied in the accessory kit and must be fitted
to the cold water supply to the Electromax to
accommodate any water expansion that results
from heating the water inside the cylinder. The
expansion vessel must be fitted 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)
Pressure reducing
valve cartridge
(3.5bar)