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2
Installation regulations
Gas Safety (Installation & Use) Regulations 1998: All
gas appliances must be installed by a competent per-
son. Failure to install correctly could lead to prosecu-
tion.
The manufacturers notes must not be taken, in any way,
as overriding statutory obligations.
The appliance must be installed in accordance with the
current IEE Wiring Regulations, local Building Regula-
tions, Building Standards (Scotland) (Consolidation),
bye-laws of the local Water Company, Health and
Safety Document 635 (Electricity at Work Regulations
1989) and any other local requirements.
Product Liability regulations indicate that, in certain cir-
cumstances, the installer can be held responsible, not
only for mistakes on his part but also for damage result-
ing from the use of faulty materials. We advise the
installer to avoid any risk by using only quality approved
branded fittings.
The relevant British Standards should be followed i.e.
• BS 6798: Specification for the installation of gas
fired hot water boilers of rated input not exceeding
60kW
• BS 5449: Central Heating for Domestic Premises
• BS 5546: Installation of gas hot water supplies for
domestic purposes
• BS 5440:1: Flues and ventilation for gas appliances
of rated input not exceeding 70 kW (gross): Flues
• BS 5440:2: Flues and ventilation for gas appliances
of rated input not exceeding 60 kW (gross): Air
Supply
• BS 6891: Installation of low pressure gas pipework
installations up to 28mm (R1).
• BS 7074:1: Code of practice for domestic heating
and hot water supply.
These instructions must be followed.
6 720 610 596 GB (01.07)
3
Installation
y Always turn off the gas cock before car-
rying out any work on components
which carry gas.
Fixing of the appliance, gas and flue con-
i
nections, commissioning of the system
and electrical connections may only be
carried out by competent persons author-
ised by CORGI.
3.1
Important remarks
y Appliance should only be installed in sealed central
heating systems.
y To avoid gas formation in the system, galvanised radi-
ators or pipes must not be used.
y If a room thermostat is used: do not fit a thermostatic
radiator valve on the radiator in the primary room.
y Add a suitable anti-freeze fluid compatible with alu-
minium to the water in the central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563 and Fernox Tel.: 01799
550811.
y In our experience, the addition of sealing agents to
the water in the central heating system can cause
problems (deposits in the heat exchanger). For that
reason we advise against their use.
3.2
Sealed systems
The appliance must not be operated without the system
being full of water, properly vented and pressurised.
The expansion vessel has a volume of 10 litres and is
charged to a pressure of 0.75 bar.
The water capacity of the system is shown in table 9,
page 26. If a greater capacity is required then an addi-
tional expansion vessel must be fitted into the system
return as close to the appliance as possible. The system
pressure can be set up to a maximum of 1.5 bar with 1
bar being the normal setting.
If the system pressure is greater than 2.5 bar when the
appliance is operating at maximum temperature then an
additional expansion vessel must be fitted into the sys-
tem return as close to the appliance as possible.
The filling point must be at low level and arranged as
shown in figs. 5 and 6.
The pressure relief valve is set to operate at 3 bar.
There must be no connection to the mains without the
approval of the local water company. All connections in
the system must be capable of withstanding a pressure
of up to 3 bar and the radiator valves conform to the
requirements of BS 2767:10.
If Thermostatic Radiator Valves are fitted then it is rec-
ommended that one radiator is left open.
Installation regulations
11
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