Bosch Appliances 18/25, 25/32kW Mains Supplies, Mains Water Expansion Vessel, Electric Supply

IMPORTANT: The appliance provides a permanent external electrical supply for servicing and must therefore be fed via a circuit breaker incorporating earth leakage protection.

MAINS WATER EXPANSION VESSEL:

A - Mini expansion vessel, part No. 7 716 102 105

B - Mains water inlet
C - Non-return valve
D - Boiler			D
		A
B	C

MAINS SUPPLIES

ELECTRIC SUPPLY:
•	Supply: 230V - 50Hz.
• Cable: PVC insulated 0.75mm2 (24 x
	0.2mm) temperature rated to 90°C.
•	Protection IP45.
•	External 5A fuse to BS 1362.
•	The appliance must be earthed.
•	Please refer to IEE regulations for cross
	bonding requirements.
•	It must be possible to isolate the appliance
	from the electric supply with at least a 3mm
	contact separation in both poles supplying
	the appliance.
•	Wiring between the appliance and the	INSTALLATION
	PRE-
	electrical supply must comply with IEE wiring

regulations and any local regulations which may apply for fixed wiring to a stationary appliance.

• Any system connected to the boiler must not have a separate electrical supply.

WATER SUPPLY:

The following are general requirements and if necessary the advice of the local water company should be sought before fitting the appliance.

•The appliance cold water supply should be the first connection off the water main where possible.

Water Mains Pressure:

Minimum dynamic mains water pressure for

optimum performance.

12/18kW	18/25kW	25/32kW
1.5 bar	1.2 bar	0.9 bar

•Maximum mains fed water pressure 10 bar. If necessary, fit a pressure reducing valve.

IMPORTANT: Non-return, back flow prevention devices (including those associated with water meters) fitted 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 flow prevention valve fitted, a mini expansion vessel (A) must be connected to the mains water inlet pipe (B) between the non-return valve (C) and the boiler (D) as shown opposite.

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 control circuit.

In areas where the temporary water hardness exceeds 200ppm, consideration may need to be given to the fitting of a scale prevention device. In such circumstances, the advice of the local water authority should be sought.

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INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07)

MAINS SUPPLIES