|The diagram below shows a typical heating
system and problem areas. With modern boilers particularly now
with the advent of high efficiency boilers there is a need to
ensure your system is clean before installation and treated with
inhibiter when commissioning. There is an approved standard
required by all manufacturers known as BENCHMARK to
which installation must be carried out to ensure your manufacturers
guarantee is valid.
new systems should be pre-commission cleansed in accordance with
BS:7593 and Benchmark. This ensures flux residues, excess jointing
compounds, mineral oil and other contaminants that can be found
in the system following installation, and that can effect the
performance of the system or cause component failure, are removed.
It is important when installing new boilers into old systems
that all sludge is first removed from the system or this could
accumulate in the new boiler and lead to premature failure. Additionally,
in hard water areas existing systems will have accumulated limescale
together with corrosion deposits in the heat exchanger, which
could easily have reduced the boiler efficiency by over 5%.
Power flushing is the most efficient and effective method
of cleansing a central heating system. The principle is to create
a powerful fresh water flow under controlled conditions to remove
debris from the system. By connecting the power flushing unit
to the heating circuit in place of the system pump, boiler or
radiator the circuit can be thoroughly cleansed of limescale
and corrosion debris. When used in conjunction with a Fernox
cleanser a typical power flush can be completed in 3-4 hours.
- Blockage in radiator valve Leading
to incorrect operation of valve, no flow in radiator
- Pump seizure and failure The abrasive
and magnetic properties of black oxide sludge increase
shaft and bearing wear in pumps causing them to stick or
- Cold spots The familiar cool low central
area of a radiator indicates a build-up of black sludge
sediment that restricts flow and reduces heat.
- When the top of a radiator is cold during
operation, either air or hydrogen is to blame. Hydrogen
gas builds up as a by-product of electrolytic corrosion
and is flammable (due caution is required).
- Pinhole leak Water damage
- Black sludge in underfloor pipework Reduced
flow or blockage in pipework
- Scale (limescale/iron oxides) in boiler Leading to reduced
efficiency, increased emissions, higher fuel bills and
with greatful thanks to FERNOX
|Since it was launched in 1999, Benchmark
has provided a vital means for improving the quality of installation
of heating and hot water systems by encouraging the correct installation
and commissioning of appliances and equipment.
The Benchmark Commissioning Checklist
The existing Benchmark log book is currently in the process of
being replaced by a new Benchmark commissioning checklist, an
A4 double sided sheet that will be included in all HHIC gas boiler
manufacturer members' installation manuals. The checklist will
help installers record more information about the installation,
in order to assist with servicing and repairs, such as details
of system cleaners and inhibitors, CO2 readings, and Gas Work
Notification numbers. The checklist is referred to in the draft
Building Regulations as an example of an effective checklist,
demonstrating Benchmark's importance as the standard Code of
Practice for the installation, commissioning and servicing of
central heating systems.
Flame Fix provide oil service and gas service, repairs and maintenance.
Covering the Exeter Devon region for domestic heating appliances,
oil boiler and gas combi boiler fault finding, central heating installations,
landlord safety certificates,solar thermal heating design and installation
clear skies registered. We also install bio mass pellet burner systems.
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