Heating System Design - Saunier Duval Themaclassic F30E SB Instructions For Use Installation And Servicing

2.3 Gas Supply
The gas installation must be in accordance with the relevant
standards.
In GB this is BS 6891.
In IE this is the current edition of I.S.813 "Domestic gas
installation".
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler.
1
Bypass fully shut
2
Open 1/4 turn
3
Open 1/2 turn
4
Open 1 turn
5
Open 2 turns
The installation of the boiler must comply with the requirements
of the current issue of BS6798, in Ireland, refer also to the
current edition of I.S.813"Domestic Gas Installations".
In GB it is necessary to comply with the Water Supply (Water
Fittings) Regulations 1999 (for Scotland, the Water Byelaws
2000, Scotland).
To comply with the Water Regulations your attention is drawn
to: The Water Regulations guide published by the Water
Regulation Advisory Service (WRAS) which gives full details of
the requirements.
In IE the requirements given in the current edition of I.S.813
"Domestic Gas Installations" and the current Building Regulations
must be followed.
• The Themaclassic F is for use with sealed central heating
systems.
• Heating surfaces may consist of radiators, convectors or fan
assisted convectors.
• The safety valve is an integral part of the boiler and it cannot
be adjusted.
• The circulation pump is integral with the boiler.
• Pipe sectional areas shall be determined in accordance with
normal practices, using the output/pressure curve
(diagram 3.1). The distribution system 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°C. The minimum flow rate is shown in table 1.
4000123924-2
2 General Information

3 Heating System Design

70
60
1
50
40
30
20
10
0
0 200 400
(10 kPa = 1 m WG)
12
Important Notice
If your boiler has been converted to use L.P.G. Propane the
following note applies:
Propane cylinders are under pressure and should never be
stored or used indoors residentially.
They should only be kept outside.
Under no circumstances should L.P.G. Propane cylinders be
fitted or stored in basement areas or boiler houses.
On completion, test the gas installation for soundness using the
pressure drop method and suitable leak detection fluid, purge in
accordance with the above standard.
2
3
4
5
600 800
Flow rate through heating system l/h
• The system can be fitted with a lockable control valve if
necessary in the main flow or return pipes shown as valve 'A'
in diagram 3.2.
• The piping system shall be routed so as to avoid any air
pockets and facilitate permanent venting of the installation.
Bleed fittings must be provided at every high point of the
system and on all radiators.
• The total volume of water permitted for the heating system
depends, amongst other things, on the static head in the cold
condition. The expansion vessel on the boiler is pressurised at
0.5 bar and allows a maximum system volume of 156 litres for
an average temperature of 75°C and a maximum service
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
diagram 3.2.
Guidance on vessel sizing is also given in a current issue of a
BS5449 and BS7074 Part 1, for IE refer to the current edition of
I.S.813 "Domestic Gas Installations".
• Provision shall be made for a drain valve at the lowest point of
the system.
• Where thermostatic radiator valves are fitted, not all radiators
must be fitted with this type of valve, and in particular, where
a room thermostat is installed.
• In the case of an existing installation, it is ESSENTIAL that the
system is thoroughly flushed prior to installing the new boiler,
using a proprietary product from Fernox or Sentinel.
1000 1200 1400
Diagram 3.1