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 13.
Note. Systems incorporating zone valves which could completely cut off the ow through the system must also include a bypass.
BALANCING
3
SYSTEM 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.
4
WATER TREATMENT
CENTRAL HEATING
ALUMINIUM
IMPORTANT.
recommend Water Treatment in accordance
with the Benchmark Guidance Notes on Water Treatment
in Central Heating Systems.
If water treatment is used 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.
For further information contact:
Fernox Cookson Electronics
Forsyth Road
Sheerwater
Woking
Surrey GU21 5RZ
+44 (0) 0870 601 5000
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
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.
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