DIMENSIONS
The SYLVA is delivered in two separate packages:- the boiler itself
- the flue system
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Hab 242 Diagram 2 diagram 6. ° C and a maximumservice pressure of 3 bar. This pressure setting can
be modified at commissioning stage if the static
head differs. An additional expansion vessel can be
fitted to the system if required, see
HEATING SYSTEM DESIGN
The SYLVA is compatible with any type ofinstallation. ° C. Theminimum flow is 500 l/h. Heating surfaces may consist of
radiators,
convectors or fan assisted convectors. Pipe sectional areas shall be determined inaccordance with normal practices, using the
output/pressure curve (diagram 3). The distributionsystem shall be calculated in accordance with the
output requirements of the actual system, not the
maximum output of the boiler. However, provision
shall be made to ensure sufficient flow so that the
temperature difference between the flow and
return pipes be less than or equal to 20 Provision shall be made for a drain valve at thelowest point of the system. Where thermostatic radiator valves are fitted, notall radiators must be fitted with this type of valve,
and in particular, where the room thermostat is
installed. diagram 6. In the case of an existing installation, it is ESSENTIAL The piping system shall be routed so as to avoidany air pockets and facilitate permanent venting
of the installation. Bleed fittings shall be provided at
every high point of the system and on all radiators. that the system is thoroughly flushed prior to installing
the new boiler. Filling the system Provision must be made for filling the system at low
level. The use of a WRC approved filling loop is
strongly recommended, connected as shown in The total volume of water permitted for theheating system depends, amongst other things, on
the static head in the cold condition. The expansion
vessel on the boiler is pressurised at 1 bar
(corresponding to a static head of 5 m w.g.) andallows a maximum system volume of 170 litres for an
average temperature of 75
DOMESTIC HOT WATER SYSTEM DESIGN
diagram 6. Copper tubing must be used for the domestic hotwater system. Unnecessary pressure losses should be
avoided. A pressure reducing valve for the cold water inletis supplied, this is packed inside the boiler.
This valve is a necessary part of the unvented system
and MUST be fitted to the cold water supply see A flow restrictor limiting the flow through the boilerto a maximum of 12 l/min is fitted to the boiler. 6