Supplied By www.heating spares.co Tel. 0161 620 6677
Page 15
ELECTR
AMA
TE
2000
1.0 DESIGN
1.3 SYSTEM DETAILS
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h = Height of Tundish
Le = Total equivalent length of discharge pipe (M)
Note : 90° bend is equivalent to 1M of straight pipe
DISCHARGE PIPE DIAMETERS
The ElectraMate 2000 appliance comes
complete with a CA type backflow prevention
valve and pressure regulating valve to provide
automatic filling of the appliance/sealed
heating system from the mains cold water
connection to the appliance.
This is now allowed by the Water Regulations
to stop any possible contamination of the
mains cold water supply by the water in the
heating system.
This replaces the temporary filling loop
arrangement historically required by the
Water Byelaws and means the connection
to the mains cold water supply can be
permanent. This will allow any loss of
water from the heating system to be
automatically replenished as with an open
vented system fitted with a feed and
expansion cistern.
Details of the valve and the discharge
requirements are shown opposite. A 22mm
minimum diameter discharge pipe is
required.
The construction of the valve is such that the
mains cold water cannot discharge through
the tundish even when the mains side check
valve is faulty. This is because the sliding
piston, which opens the main port also closes
the vent (i.e. tundish) port. The valve will
therefore only discharge if the check valve on
the appliance/system side is faulty and the
mains pressure is less than the pressure in the
appliance/system.
The valve requires a pressure differential to
operate correctly and a minimum dynamic
pressure of 1.5 bar is required at the connection
to the appliance under maximum domestic
water simultaneous demand conditions, 2.0
bar is recommended.
The pressure regulating valve is set to 1.0
bar. This is usually sufficient for the heating
systems in most domestic properties - see the
next page for further details.
Note: Do not open the 90º angle isolating
ballvalve to fill the appliance/heating
system until the heating system is complete
- see the labels on the appliance for further
details.
Filling the Heating System
1 Bar
PRV
CA
Incoming
MCWS
Tundish
Pressure relief
valve discharge
90º angle
isolating ballvalve
Summary of Contents for ElectraMate 2000
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