1

B

A

C

2

3 D

FILLING THE SYSTEM

1Pull lever (C) up and push to the left to move the diverter valve to the mid-position between ports A and B.

Push and hold lever (C) down to lock.

2Loosen the automatic air vent cover.

4Sealed systems only; check and if required, adjust the expansion vessel pressure using the Schraeder type valve (D).

The charge pressure of the built-in 12 Litre expansion vessel is 0.5 bar as dispatched, which is equivalent to a static head of 5 metres (16.7 ft).

Total system

Initial system

Initial charge

volume (litres)

pressure (bar)

pressure (bar)

180

0.5

0.5

107

1.0

0.5

138

1.0

1.0

If an extra expansion vessel is fitted to the central heating return, adjust this to the same pressure as the appliance internal expansion vessel, refer to separate instructions supplied with the extra expansion vessel.

4

1 - 2 bar

4 Open all system and radiator valves (E).

Turn on the water main stop cock.

Open vented systems only; turn on the

water to the system feed and expansion

cistern and allow the system to fill.

Sealed systems only; fill the system to

between 1 and 2 bar pressure via a WRAS

E E

F

5

6

B

C A

approved filling link. Monitor the pressure

COMMISSIONING

gauge during venting and repressurise if

required.

Check air is being discharged from the

automatic air vent.

Vent all radiators, retighten when completed,

 

check the system and correct any leaks.

 

Bleed air from both of the secondary heat

 

exchanger air vents (F).

 

Bleed air from the pipework using the

 

pump bleed screw.

 

5Sealed systems only; connect a suitable hose to the Heatslave tank drain. Open the drain valve to reduce the system to the correct pressure, then close the drain valve. Ensure safe disposal of the discharge. Rotate the adjustable pointer on the pressure gauge to record the set system pressure.

6Check system and rectify any leaks.

Push lever (C) to the left and pull upwards to allow the lever to return to position A.

Leave the lever (C) unlocked at position A.

30

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

FILLING THE SYSTEM

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Bosch Appliances 25/32kW, 18/25, 12/18 instruction manual Filling the System
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25/32kW, 12/18, 18/25 specifications

Bosch Appliances has carved out a reputation for engineering high-performance heating solutions, particularly with their range of heating systems including the 18/25, 12/18, and 25/32 kW models. These systems are designed to meet the diverse needs of residential and commercial spaces while maintaining energy efficiency and sustainability.

The Bosch 18/25 kW model excels in providing an optimal heating solution for medium to large residential properties. It is equipped with a highly efficient condensing boiler that extracts additional heat from flue gases, achieving significant energy savings. The built-in, user-friendly interface allows for easy programming and monitoring, which maximizes user convenience.

The 12/18 kW model provides a versatile opportunity for smaller homes or apartments. Its compact design ensures that it fits seamlessly into tighter spaces without sacrificing performance. The unit operates quietly, making it an excellent choice for residential areas where noise can be a concern. Additionally, it features the latest modulation technology, optimizing energy usage and maintaining consistent temperatures.

Finally, the 25/32 kW model is ideal for larger installations, offering robust performance even in high-demand scenarios. This model benefits from advanced heating management systems that enable intelligent control of heating zones, ensuring efficiency and comfort throughout the property. With its enhanced energy rating, the 25/32 kW model significantly reduces the carbon footprint, aligning with modern sustainability goals.

Across the board, Bosch Appliances integrates advanced technologies such as intelligent diagnostics, smart home compatibility, and eco-friendly materials. All models are constructed with durability in mind, featuring corrosion-resistant heat exchangers and high-quality components designed for longevity.

The customer-focused features, including comprehensive warranty packages and responsive customer service, further exemplify Bosch's commitment to quality. Overall, Bosch Appliances 18/25, 12/18, and 25/32 kW heating systems stand out for their innovative technology, efficient performance, and reliability, making them an excellent choice for those looking to upgrade their heating solutions.
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