EHC Fusion E10 Combi Series - Installation - Plumbing; Plumbing - Water Supply Requirements; Plumbing - Cold Mains Pipework Example

EHC Fusion E10 Combi – Installation and technical manual Page 10
8 Installation: Plumbing
Water supply requirements
The Fusion E10 Combi operates at 3 bar (controlled by the inlet control set) and is capable
of delivering over 50 litres per minute. The high quality inlet control set has been designed to
make the most of the flow rates available, however the performance of any unvented system
is only as good as the mains water supply to the unit. The maximum possible water demand
should be assessed by taking into consideration that both hot and cold services are supplied
simultaneously from the mains. The water supply should be checked to ensure it can meet
these requirements. If necessary consult the local water company regarding the likely
pressure and flow rate availability.
If measuring the water pressure, please note that a high static (no flow) mains pressure is no
guarantee of a high flow rate. In a domestic installation 1.5 bar and 25 l/m should be
regarded as the minimum. The maximum recommended mains pressure for the inlet control
set is 16 bar. Consideration should be given to upgrading existing ½” (15mm) cold mains
pipework to a larger size if the recommended minimum pressure/flowrate is not being
achieved.
Cold mains pipework Example
1. Run the cold main pipework to where the Fusion E10 Combi unit is to be installed. Take
care not to run the cold mains pipework near the hot water or heating pipe work so that heat
pick up is minimized.
2. Identify the cold water supply pipe and fit an isolating valve (not supplied). A 22mm
BS1010 stopcock can typically be used, however a 22mm quarter turn full bore valve is
preferable as it does not restrict the flow as much. Do not use “screwdriver slot” or similar
valves.
3. Make the connection to the cold feed of the Fusion E10 Combi and incorporate a drain
valve. Position the inlet control immediately above the Temperature & Pressure Relief Valve
(TPRV) mounted on the side of the unit (see diagrams below). This ensures that the unit
does not have to be drained down in order to service the inlet control set. Ensure that the
arrow points in the direction of the water flow.