Zanussi ULTRA COMBI 35 Installation And Servicing page 14

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 66. 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 (200 ppm), 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. A DHW Expansion Vessel kit available as an option.
5 WATER TREATMENT
CENTRAL HEATING
This boiler has an ALUMINIUM alloy heat exchanger.
IMPORTANT.
The application of any other treatment to this product
may render the boiler guarantee Invalid.
The manufacturer recommends Water Treatment in
accordance with the Benchmark Guidance Notes on Water
Treatment in Central Heating Systems.
If water treatment is used the manufacturer recommend
only the use of
SCALEMASTER GOLD 100, FERNOX, MBI,
ADEY MC1, SENTINEL X100 or CALMAG CM100
associated water treatment products, which must be used
in accordance with the manufacturers' instructions.
DOMESTIC HOT WATER
In hard water areas where mains water can exceed
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.
For further information contact:
14
GENERAL
C at the tap furthest from the boiler.
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inhibitors and
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 11.
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.
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.
The manufacturer recommends 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.
Notes.
1. It is most important that the correct concentration of the water
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
C temperature drop at
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Installation and Servicing