Keston Combi 35kw User Manual download pdf (Page 11)

11Keston Combi - Installation and Servicing

general

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 8.

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

C temperature drop at

each radiator.

3. Adjust the room thermostat and programmer to

NORMAL settings.

SYSTEM BALANCING

SYSTEM REQUIREMENTS cont’d

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 70. The boiler will

require the ow rate to be set to obtain a temperature rise of

C at the tap furthest from the boiler.

3. The boiler is 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.

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

tted into the boiler cold supply within the requirements of the

local water company.

IMPORTANT

Provision MUST be made to accommodate the expansion of DHW

contained within the appliance, if a non-return valve is tted to the

DHW inlet, or a water meter with a non-return valve is installed.

Cold water rising main and pipework in exposed areas need to

be suitably lagged to prevent freezing.

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 or

SENTINEL X100

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 articially 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 dened 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 articially

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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Keston Combi 35kw User Manual Page 11

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