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 11.
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.
4
SYSTEM BALANCING
5
WATER TREATMENT
3
SYSTEM REQUIREMENTS -
DOMESTIC HOT WATER
1. The domestic hot water service must be in accordance with BS 5546
and BS 6700.
2. Refer to Table 1 for minimum and maximum working pressures. In
areas of low mains water pressures the domestic hot water regulator
may be removed from the DHW ow turbine cartridge. Refer to
Frame 67. The boiler will require the ow rate to be set to obtain a
temperature rise of 35
o
C at the tap furthest from the boiler.
3. The boilers are suitable for connection to most types of washing
machine and dishwasher appliances.
4. When connecting to suitable showers, ensure that:
a. The cold inlet to the boiler is tted with an approved anti-vacuum
or syphon non-return valve.
b. Hot and cold water supplies to the shower are of equal pressure.
Where the water hardness exceeds 200mg/litre (200 ppm), it is
recommended that a proprietary scale reducing device is tted into
the boiler cold supply within the requirements of the local water
company.
IMPORTANT. Provision must be made to accomodate the expansion of
DHW contained within the appliance. If the DHW inlet contains a back
ow prevention device or non-return valve, e.g. a water meter, then a
mini expansion vessel should be tted between the device and the boiler
in the cold inlet pipe.
Cold water, rising main & pipework in exposed areas need to be suitably
lagged to prevent freezing.
Note. DHW Expansion Vessel kit available from Ideal.
CENTRAL HEATING
The Logic Combi range of boilers have an ALUMINIUM
alloy heat exchanger.
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) 8706 015000
Sentinel Performance Solutions
The Heath Business & Technical Park
Runcorn, Cheshire WA7 4QX
Tel: 0800 389 4670
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 210320
Adey Professional Heating Solutions
Gloucester Road, Cheltenham GL51 8NR
Tel: +44 (0) 1242 546700
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.
recommend the use of Fernox Quantomat, Sentinel
Combiguard,Calmag CalPhos I scale reducing devices or
Scalemaster In-line Scale Inhibitor branded Ideal, which must be
used in accordance with the manufacturers’ instructions.
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