Baxi Potterton BBU 15 HE - Manual (Page 11)

4.0 System Details
11
© Baxi Heating UK Ltd 2009
4.1 Water Circulating Systems
1. The appliance is suitable for use on fully pumped
systems ONLY which may be sealed or open vented.
2. The following conditions should be observed at all
times:
The static head must not exceed 30m
of water.
The static head must not be less than
1m 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 such a way
that they do not restrict the servicing of
the boiler.
Position isolating valves as close as
possible to the circulating pump.
There is a drain cock supplied in the
plumbing kit.
4.2 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.
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.
Full instructions are supplied with the products, for
further information contact Sentinel (0800 389 4670)
or Fernox (0870 870 0362).
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 manufacturer’s
instructions. (Test kits are available from inhibitor
stockists.)
For information or advice regarding any of the above
contact Technical Enquiries 0844 871 1555.