1.15 SYSTEM BALANCING
The boiler does not normally need a bypass but at least some
radiators on the heating circuit, of load of at least 10% of the
minimum boiler output, must be provided with twin lockshield
valves so that this minimum heating load is always available.
See note regarding thermostatic radiator valves on page 12.
Note. Systems incorporating zone valves which could
completely cut off the ow through the system must also
include a bypass.
BALANCING
1. Set the programmer to ON.
Close the manual or thermostatic valves on all radiators,
leaving the twin lockshield valves (on the radiators referred
to above) in the OPEN position.
Turn up the room thermostat and adjust the lockshield
valve to give an uninterrupted ow through the radiator.
These valves should now be left as set.
2. Open all manual or thermostatic radiator valves and adjust
the lockshield valves on the remaining radiators, to give
around 20
o
C temperature drop at each radiator.
3. Adjust the room thermostat and programmer to NORMAL
settings.
1.16 WATER TREATMENT
CENTRAL HEATING
The Keston Combi range boiler has an ALUMINIUM alloy heat
exchanger.
IMPORTANT.
The application of any other treatment to this product may
render the guarantee of Keston Invalid.
Keston recommend Water Treatment in accordance with the
Benchmark Guidance Notes on Water Treatment in Central
Heating Systems.
If water treatment is used Keston recommend only the use of
SCALEMASTER GOLD 100, FERNOX, MBI, ADEY MC1, SENTINEL
X100 or CALMAG CM100 inhibitors and associated water
treatment products, which must be used in accordance with the
manufacturers’ instructions.
Notes.
1. It is most important that the correct concentration of the
water treatment products is maintained in accordance with
the manufacturers’ instructions.
2. If the boiler is installed in an existing system any unsuitable
additives MUST be removed by thorough cleansing. BS
7593:2006 details the steps necessary to clean a domestic
heating system.
3. In hard water areas, treatment to prevent lime scale may be
necessary - however the use of articially softened water is
NOT permitted.
4. Under no circumstances should the boiler be red before
the system has been thoroughly ushed.
DOMESTIC HOT WATER
In hard water areas where mains water can exceed 200ppm
Total Hardness (as dened by BS 7593:2006 Table 2) a scale
reducing device should be tted into the boiler cold supply
within the requirements of the local water company. The use of
articially softened water, however, is not permitted.
Keston recommend the use of Fernox Quantomat, Sentinel
Combiguard or Calmag CalPhos I scale reducing devices
together with scalemaster in-line scale inhibitor branded Ideal,
which must be used in accordance with the manufacturers’
instructions.
For further information contact:
Fernox Cookson Electronics
Forsyth Road, Sheerwater, Woking, Surrey GU21 5RZ
+44 (0) 870 601 500
Sentinel Performance Solutions
The Heath Business & Technical Park, Runcorn, Cheshire WA7
4QX
Tel: 0800 389 4670
www.sentinel-solutions.net
Scalemaster Water Treatment Products
Emerald Way, Stone, Staffordshire ST15 0SR
Tel: +44 (0) 1785 811636
Calmag Ltd.
Unit 3-6, Crown Works, Bradford Road, Sandbeds, Keighley,
West Yorkshire BD20 5LN
Tel: +44 (0) 1535 210 320
Adey Professional Heating Solutions
Gloucester Road, Cheltenham GL51 8NR
Tel: +44 (0) 1242 546700
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