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5.2 Important comments on the treatment of the heating circuit
Water treatment
- Use untreated tap water only to fill the central heating system.
- The pH value of the system water must be between 6 and 9.
- Chloride content <20 mg/l
- Conductivity <500 µS/cm at 25 °C
- In case inhibitors are being used, please follow the instructions
given.
If used correctly water treatment can improve the boilers efficiency
and increase the anticipated life expectancy of the boiler. For further
information a special document "Remeha water quality regulations"
is available on request. The regulations mentioned in this document
must be followed.
As most systems contain a variety of metals, it is considered good
practice to provide some form of water treatment in order to prevent
or reduce the following:
- metallic corrosion
- formation of scale and sludge
- microbiological contamination
- chemical changes in the untreated system water.
All scale deposists, however small, will reduce the
efficiency of the boiler and should be prevented.
Suitable chemicals and their use should be discussed with a
specialist water treatment company prior to carrying out any work
(environmental aspects, health aspects). The specification of the
system and manufacturers recommendations must be taken into
account, along with the age and condition of the system.
New systems should be flushed thoroughly to BS 7593 (1992) to
remove all traces of flux, debris, grease and metal swarf generated
during installation. Care to be taken with old systems to ensure any
black metallic iron oxide sludge and other corrosive residues are
removed, again by flushing, ensuring that the system is drained
completely from all low points.
Please ensure that the new boiler plant is not in circuit when the
flushing takes place, especially if cleansing chemicals are used
to assist the process.
It is important to check the inhibitor concentration after installation,
system modifications, filling the system and every service in
accordance with these instructions.
For the correct dosage and the suitability of inhibitors for use with our
boilers and for further information on water treatment or system
cleaning we advise direct contact with either of the following
companies:
FERNOX, Cookson Electronics or WESTERN ENVIRONMENTAL
Forsyth Road
Sheerwater
Woking
Surrey GU21 5RZ
Tel.: 0870 6015000
Fax.: 01799 522280
Email.: sales
fernox.com
Web site.: www.fernox.com
or
25/01/2011 - 300014883-001-K
Western House
Britonwood Trading Est
Knowsley
Merseyside
L33 7YP
Tel.: 0151 546 5777
Gas 110 Eco 115 / 65
BETZ DEARNORN Ltd
Sentinal
Foundry Lane
Widnes
Cheshire WA8 8UD
Tel.: 0151 424 5351
Fax.: 0151 420 5447
Cold feed and expansion tank height for open
vented systems
We recommend the boiler is installed on a closed (pressurised)
system wherever possible with a minimum operating pressure of
0.8 bar However, open vented systems can be accomodated as
follows: the cold feed and expansion tank heights for all open vented
systems must comply with the requirements laid down in the Health
and Safety Executive publication (latest edition).
The Gas 110 Eco 115 / 65 series boilers require a minimum static
head of:
- 5 m for Gas 110 Eco 115,
- 3 m for Gas 110 Eco 65.
For operation in open vented systems:
- parameter
(flow temperature set-point) must be set to 75,
- parameter
(boiler modulation start point) must be set to 15,
- parameter
(high limit temperature set-point) must be set to 95.
Safety valve
A safety valve should be fitted in accordance with the relevant British
Standard.
System pump
The boiler must be installed on a fully pumped system.
Installing the boiler in existing installations
- Remove sludge from the installation,
- Clean the installation with a universal cleaner to eliminate debris
from the appliance,
- Thoroughly flush the installation until the water runs clear and
shows no impurities,
- Protect the installation against corrosion and frost with an inhibitor
and an anti-freeze.
The boiler must be used only in closed circuit heating installations. If
you have underfloor heating, the installer must install a safety
thermostat with manual reset to prevent overheating. For an
underfloor heating circuit without system insulation, only oxygen tight
heating pipes must be used. If the plastic pipe manufacturer
recommends a chemical additive, it is necessary to be particularly
careful that there are no adverse effects on the aluminum or
aluminum alloy content of components. For floor heating systems
with pipes that are not oxygen tight, the system must be insulated
(heat exchanger). In this case, the floor circuit must be protected
separately (Expansion vessel, Safety valve).
A minimum water level safety device is not necessary. Protection is
ensured by the control unit.
27
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