5.2.6 Treatment of Water Circulating Systems
All recirculatory water systems will be subject to corrosion unless they are flushed and an appropriate water treatment is applied. To prevent this, follow the guidelines given
in BS 7593 "Treatment of Water in Domestic Hot Water Central Heating Systems" and the treatment manufacturers instructions.
1.
Treatment must involve the use of a proprietary cleanser, such as Sentinel X300 or X400, or Fernox F3 and an inhibitor such as Sentinel X100 or Fernox MB-1.
2.
Full instructions are supplied with the cleansing products, for further information contact Sentinel (0800 389 4670) or Fernox (0870 870 0362).
3.
Failure to flush and add inhibitor to the system will invalidate the appliance warranty.
It is important to check the inhibitor concentration after installation, system modification and at every service in accordance with the inhibitor manufacturers instructions.
(Test kits are available from inhibitor stockists.)
4.
Complete the label supplied with the inhibitor and attach to the inside of the boiler case. Detail of system treatment should be added for future reference.
5.
For information or advice regarding any of the above contact Baxi Customer Support 0344 871 1525.
6.
page 23
5.2.7 System Details - General
Water Circulating Systems
The appliance is suitable for use with open vent fully pumped systems and sealed systems .
1.
The following conditions should be observed on all systems:
The static head must not exceed 25m of water.
The boiler must not be used with a direct cylinder.
Drain cocks should be fitted to all system low points.
All gas and water pipes and electrical wiring must be installed in a way which would not restrict the servicing of the boiler.
Position isolating valves as close to circulating pump as possible.
Pipework
The sizes of flow and return pipes from the boiler should be determined by normal methods, according to the requirements of the system. The connections on the boiler are
22mm.
1.
A 20°C (36°F) drop in temperature across the system is recommend ed for condensing boilers. Existing radiators may be oversized and so allow this, but where radiator
sizing is marginal it may be advisable to retain a system temperature drop of 11°C (20°F).
2.
In systems using non-metallic pipework it is necessary to use copper pipe for the boiler Flow and Return. The copper must extend at least 1 metre from the boiler and
include any branches (
Fig. 3
).
3.
Fig. 3
5.2.8 Low Head Installation / Open
Using a close coupled arrangement the minimum head is as shown in the diagrams (
Figs. 4
,
5
&
6
) subject to the following conditions:
1.
The pump being adjusted to give a 20°C drop across the boiler.
a.
Ideally the pump should be fitted on the flow but providing that the cold feed and open vent pipe are positioned correctly
(e.g. the system is not prone to pumping over, air entrainment etc.) the pump may be fitted on the primary return pipe.
b.
The pump must be fitted in accordance with the pump manufacturer's instructions.
c.
The open vent pipe must be taken up from a tee in a horizontal section of the flow pipe.
d.
Fig. 4
Typical Low Head Installation
Baxi EcoBlue Advance 13, 16, 19, 25, 30 Heat ErP Installation Manual
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