Glow-worm Flexicom cx - Manual (Page 15)

0020107232_03 - 12/14 - Glow-worm
INSTALLATION
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5.3 Water treatment
5.3.1 General
The Glow-worm Flexicom range of boilers have an
Aluminium alloy heat exchanger. Water treatment products
used in the system should be suitable for use with
Aluminium.
Existing system- It is ESSENTIAL that prior to installing
the new boiler the system is thoroughly flushed.
New system- For optimum performance after installation, the
boiler and its associated central heating system should also be
flushed.
For long-term corrosion protection, after flushing, an inhibitor
should be used, refer to the current issue of BS 5449 and BS
7593 on the use of inhibitors in central heating systems.
Debris left in the system can damage the boiler,
reduce efficiency and also lead to system
corrosion and generation of flammable gas.
Failure to comply with the guidelines for the
use of water treatment with the appliance will
invalidate the appliance warranty.
The pH value of the system water must be
between 6.5 and 8.5 or the appliance guarantee
will be invalidated.
Before flushing 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.
5.3.2 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 (cleaner)
compatible with Aluminium at the correct strength for the
system conditions in accordance with the manufacturer’s
instructions.
Examples of suitable flushing agents/cleansers are:
Sentinel X300, X400
Fernox F3
• 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.
• It is essential to drain and thoroughly flush the whole 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.
5.3.3 Inhibiting the system
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 inhibitor
manufacturer’s guidelines.
Examples of suitable inhibitors are:
Sentinel X100
Fernox protector F1
Artificially softened water must not be used to
fill the central heating system.
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.
i
Ensure that the pH of the treated system water is
confirmed as between 6.5 and 8.5 and free of any
residual deposits from the flushing process.
i
Ensure the Benchmark Logbook is completed with
information on water treatment products before
handing over to the user.