Domestic Hot Water; Water Treatment - IDEAL LOGIC Combi 24 Installation And Servicing

3 sysTEM REqUIREMENTs - CONT

Domestic hot Water

1. The DHW service must be in accordance with BS5546 & BS6700.
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 flow turbine cartridge.
Refer to Frame 71. The boiler will require the flow rate to be set to
obtain a temperature rise of 35
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 fitted with an approved anti-
vacuum or syphon non-return valve.
b. Hot and cold water supplies to the shower are of equal pressure.
5. hard Water areas
Where the water hardness exceeds 200mg/litre, it is recommended
that a proprietary scale reducing device is fitted 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 flow prevention device or non-return valve, e.g. a water meter,
then a mini expansion vessel should be fitted between the device and
the boiler in the cold inlet pipe.
Cold water, rising main and pipework in exposed areas need to
be suitably lagged to prevent freezing.
Note. DHW Expansion Vessel kit available from Ideal.
5

WaTER TREaTMENT

CENTRaL hEaTING
The Logic Combi range of boilers have an ALUMINIUM alloy
heat exchanger.
IMPORTaNT.
The application of any other treatment to this product may
render the guarantee of Ideal stelrad Group Invalid.
Ideal stelrad Group recommend Water Treatment in
accordance with the Benchmark Guidance Notes on Water
Treatment in Central Heating Systems.
If water treatment is used Ideal stelrad Group recommend only
the use of
SCALEMASTER GOLD 100, FERNOx, MBI or SENTINEL
inhibitors and associated water treatment products,
x100
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 artificially softened water is NOT
permitted.
4. Under no circumstances should the boiler be fired before the
system has been thoroughly flushed.
12
GENERaL
C at the tap furthest from the boiler.
o
4 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 9.
Note. Systems incorporating zone valves which could
completely cut off the flow 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 flow
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
each radiator.
3. Adjust the room thermostat and programmer to
NORMAL settings.
DOMEsTIC hOT WaTER
In hard water areas where mains water can exceed 200ppm Total
Hardness (as defined by BS 7593:2006 Table 2) a scale reducing
device should be fitted into the boiler cold supply within the
requirements of the local water company. The use of artificially
softened water, however, is not permitted.
Ideal stelrad Group recommend the use of Fernox Quantomat,
Sentinel Combiguard and 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 Manufacturing Co. Ltd
Cookson Electronics
Forsyth Road, Sheerwater, Woking, Surrey GU21 5RZ
+44 (0) 1799 521133
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 4-6, Crown Works, Bradford Road,
Sandbeds, Keighley, West Yorkshire BD20 5LN
Tel: +44 (0) 1535 210 320
Ideal Logic Combi -
C temperature drop at
o
Installation and Servicing