Technical data

6 720 611 445 GB (04.05)
Installation regulations
11
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 (net): Flues
• BS 5440:2: Flues and ventilation for gas appliances
of rated input not exceeding 70 kW (net): Air
Supply
• BS 6891: Installation of low pressure gas pipe work
installations up to 28 mm (R1).
• BS 7074:1: Code of practice for domestic heating
and hot water supply
• BS 7671: Requirements for Electrical Installation.
These instructions must be followed.
3 Installation
3.1 Important remarks
B Appliance should only be installed in fully pumped
sealed and open vent central heating systems.
B To avoid gas formation in the system, galvanised
radiators or pipes must not be used.
B Do not fit a thermostatic radiator valve on the radiator
in the primary room where a room thermostat is used.
B 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: [phone] and Fernox Tel: 01799-
550811.
B 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 System
The system must comply with the requirements of BS
6798 and BS 5449.
General
The appliance is only suitable for connection to indirect
fully pumped sealed and open vented systems. The
minimum static head is 1m and the maximum is 30m.
The controls must be wired to ensure that the boiler
does not cycle when the electronically controlled zone
valves are closed.
Note 1: An automatic bypass is required if the controls
i.e. 2-port valves, can result in the closure of the CH and
DHW circuits when the boiler is hot. If mechanically
operated thermostatic control valves are fitted on all
radiators an automatic bypass is required, located at
least 2m from the boiler.
Note 2: A bypass is not usually required for systems
using a 3-way diverter valve (with one valve is open to
flow at all times) unless TRV’s are used throughout the
system. Refer to the current Building Regulations or the
Good Practice Guide 302 which lists all the above
requirements.
Plastic pipes must not be directly connected to the
appliance. A copper to plastic transition piece should
be positioned a minimum of 600mm from the appliance.
B Always turn off the gas cock before car-
rying out any work on components
which carry gas.
i
Fixing of the appliance, gas and flue con-
nections, commissioning of the system
and electrical connections may only be
carried out by competent persons author-
ised by CORGI.