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GENERAL - PAGE 9
2.11
SEALED SYSTEM REQUIREMENTS
Refer to Fig. 4.
1.
The installation must comply with the requirements of BS6798 and BS5449. Maximum water temperature is 82°C ± 3°C.
2.
A safety valve set to operate at 3 bar and a pressure gauge covering the range 0 to 6 bar are incorporated within the boiler.
3.
A 10 litre expansion vessel to BS4841 is fitted and pre-charged to 0.5 bar. This is suitable for a system with a maximum water
content of 140 litres.
4.
Water lost from the system shall be replaced from a make-up vessel, and double check valve, mounted higher than the top of the
system and connected as shown in Fig. 4a or manually by a temporary hose connection as shown in Fig. 4b (remove the
temporary hose after use).
Note: Stop valves must comply with the requirements of BS1010:2.
5.
The hot water cylinder shall either be the indirect coil type or a cylinder fitted with an immersion calorifier.
6.
An automatic air vent should be fitted at the highest point in the system.
2.12
SYSTEM SCHEMATIC
Refer to Fig. 5.
Fig. 5
Supplied By www.heating spares.co Tel. 0161 620 6677
Fig. 4a
Fig. 4b
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