
PRE-INSTALLATION
6 720 812 175 (2014/07)
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3
PRE-INSTALLATION
3.1
CLEANING PRIMARY SYSTEMS
BEFORE CLEANING THE SYSTEM:
▶
Ensure that the system and pipe work is in good working order.
▶
Where possible keep the existing boiler/circulating pump in place
when flushing the system.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
FLUSHING THE SYSTEM
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent
compatible with
aluminium
at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ Run the boiler/system at normal operating temperature as directed by
the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain cocks and refill with fresh water and a suitable
inhibitor.
▶ Vent any air from the boiler and system.
INHIBITOR
Add a suitable inhibitor or combined inhibitor/anti-freeze, if the system
is exposed to freezing conditions, to the heating system in accordance
with the DWTA code of practice and manufacturer‘s guidelines.
WATER TREATMENT PRODUCTS
Suitable water treatment products can be obtain from the following
manufacturers:
3.2
MAINS SUPPLY
3.2.1
GAS SUPPLY
• Boilers using Natural Gas (NG) must be connected to a governed
meter.
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the boiler must be in
accordance with BS6891.
• Under no circumstance should be size of the gas supply pipe be less
than 22 mm.
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier. This is to ensure that the equipment is
in good working order and can meet the gas flow and pressure
requirements, in addition to the demand from any other appliance
being served.
CAUTION:
MAINS SUPPLIES
▶ Isolate the mains supplies before starting any work
and observe all relevant safety precautions.
NOTICE:
Before installation
▶ All the following Pre-Installation sections must be read
and requirements met before starting boiler or flue
installations.
NOTICE:
Water treatment
▶ Debris from the system can damage the boiler and
reduce efficiency. Failure to comply with the
guidelines for the use of water treatment with the
appliance will invalidate the appliance warranty.
NOTICE:
ARTIFICIALLY SOFTENED WATER MUST NOT
BE USED TO FILL THE CENTRAL HEATING SYSTEM.
WARNING:
Sealing agents
▶ The addition of sealing agents to the system water is
not permitted as this can cause problems with
deposits left in the heat exchanger.
FERNOX
0870 601 5000
www.fernox.com
SENTINEL
0800 389 4670
www.sentinel-solutions.net
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