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7.4.3 Water treatment
The system should be filled with mains cold water (for
the UK this will usually have a pH of between 7 and 8).
Pressurised installations with a boiler/ system content
ratio of 1:10 or less should not require water treatment,
provided that the following conditions apply:
1. The system is flushed thoroughly to remove all fluxes
and debris and filled completely once.
2. Make up water is limited to 5% per annum.
3. The hardness of the water does not exceed 360 ppm
(20°D).
All scale deposits will reduce the efficiency of the boiler
and should be prevented. However provided the above
is complied with any scale produced will not be too det-
rimental to the boiler efficiency and will not reduce the
anticipated life expectancy of the boiler.
NOTE: Scale deposits in excess of 5 mm will reduce
boiler efficiency and increase the risk of premature cast-
ing failure.
As most systems contain a variety of metals it is consid-
ered good practice to provide some form of water treat-
ment (especially in open vented systems) in order to
prevent or reduce the following.
- Metallic corrosion
- Formation of scale and sludge
- Microbiological contamination
- Chemical changes in the untreated system water
Suitable chemicals and their use should be discussed
with a specialist water treatment company prior to car-
rying out any work. 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 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 thoroughly
flushing, ensuring that the system is drained completely
from all low points.
NOTE: 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.
Under no circumstances is the boiler to be operated
with cleaning chemicals in the system.
To summarise:
- Minimise water loss
- Prevent pumping over in open vented systems
- Provide adequate air venting at all high points
- Maximum chlorine content of 200 mg/ 1
Take advice on the suitability of inhibitors for use with
aluminium boilers
MAX pH of 8.5 when using additives (max. pH of 9
without additives).
If water treatment is used, we recommend the following
products:
'Copal' manufactured by:
Fernox Manufacturing Company Ltd.
Britannia Works
Clavering
Essex, CB1L 4QZ
Tel No: 0179 955 0811
Fax No: 0179 955 0853
or:
Sentinal 'X100' manufactured by:
BetzDearborn Ltd
Sentinal
Foundry Lane
Widnes
Cheshire WA8 8UD
Tel No: 0151 424 5351
Fax No: 0151 420 5447
For the correct dosage and for further information on
water treatment or system cleaning we advise direct
contact with either of the above companies.
7.4.4 Safety valve
A safety valve should be fitted in accordance with BS
6644 (per module). The flow pipe of each boiler module
of the Remeha Gas 610 ECO includes a fitting, which
can be used for a safety valve, size 11⁄2" BSP (F).
Recommended minimum safety valve size of 25 mm for
the 5 & 6 section, 32 mm for the 7 section, 38 mm for
the 8 section and 50 mm for the 9 section (all full bore
type).
7.4.5 Water circulation
Provided that the factory pre-set high limit and flow
temperatures are not altered and the Remeha modulat-
ing controls are used no minimum flow rate is required
as the 'abc
' system will monitor these conditions and
®
reduce the boiler output, finally shutting down until flow
conditions improve. As a result, the boiler module is vir-
tually unaffected by low water flow.
7.4.6 Thermostat pocket
A thermostat pocket (7mm i/d plain pocket) is supplied
as standard in the flow pipe of each boiler module for an
external control/ BMS temperature sensor.
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