Bosch GREENSTAR HEATSLAVE II EXTERNAL 12/18 Service Manual download pdf (Page 24)

*Terms and conditions apply.

Water supply

The following are general requirements and if necessary the

advice of the local water company should be sought before

ﬁ tting the appliance.

•

The appliance cold water supply should be the ﬁ rst

connection off the water main where possible.

Water mains pressure

Minimum dynamic mains water pressure for maximum

performance.

Maximum mains fed water pressure 10bar. If necessary, ﬁ t a

pressure reducing valve.

The appliance will accept pre-heated hot water to a

temperature of 60°C

Non-return, back ﬂ ow prevention devices (including those

associated with water meters) ﬁ tted to the mains water

supply can cause a pressure build up which could damage

the boiler and other household appliances. Where the water

main supply has a non-return, back ﬂ ow prevention valve

ﬁ tted, a mini expansion vessel (part no. 7 716 192 105)

must be connected to the mains water inlet pipe between

the non-return valve and the boiler.

Use in hard water areas

Normally there is no need for water treatment to prevent

scale formation as the maximum temperature of the heat

exchanger is limited by the electronic control circuit.

In areas where the temporary water hardness exceeds

200ppm, consideration may need to be given to the ﬁ tting

of a scale prevention device. In such circumstances, the

advice of the local water authority should be sought.

Hot water systems

Taps and mixing valves must be capable of sustaining

a pressure up to 10bar in accordance with the Water

Regulations as they will be operating at mains water

pressure.

•

Hot water temperature and ﬂ ow rate are affected by the

size and insulation of pipework making up the distribution

system and are controlled by the hot water tap and the

water main inlet pressure. A mixing valve can be ﬁ tted if a

more permanent setting is required.

•

If using more than one outlet at once causes water ﬂ ow

starvation, ﬁ t ﬂ ow balancing valves or Ball-O-Fix valves to

the appropriate outlets.

•

Only thermostatically controlled showers are suitable for

use with this appliance.

Mains water pressure

12/18 18/25

25/32

1.5bar 1.2bar

1.6bar

Plastic pipework

Any plastic pipework used for the DHW system must have

a polymeric barrier, complying with BS 7921 and installed

to BS 5955 with 1,000mm (minimum) length of copper or

stainless steel pipe connected to the boiler.

•

Before installing plastic pipework, the pipe manufacturer’s

literature should be consulted.

•

To prevent the temperature and pressure exceeding

the limits advised by the pipe manufacturer, a pressure

reducing valve must be used to prevent the incoming

water pressure exceeding 3bar (maximum). Also, a mini

expansion vessel must be ﬁ tted to absorb the expanding

water and a blending valve set to 60°C must be ﬁ tted

before the DHW plastic pipework.

•

When selecting plastic pipework for use with domestic

water supply, it should be ensured that it is compliant

with all current local and national legislation and

regulations, including building regulations part G,

BS 7291 - 1,2 & 3: 2006, BS 8000 - 15-15: 1990 and

information.

Guarantee

Worcester oil-ﬁ red appliances are offered with

a 2 year* guarantee on parts and labour from

the date of installation, providing the

appliance is commissioned upon installation

and the regular service requirements are met.

The primary heat exchanger comes with a

5 year* guarantee and the secondary heat

exchanger is guaranteed for 10 years*.

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Bosch GREENSTAR HEATSLAVE II EXTERNAL 12/18 Service Manual Page 24

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