Bosch Appliances 18/25, 25/32kW, 12/18 instruction manual Water Treatment, Pump and all radiators

1

C

C

2

A

3

B

COMMISSIONING	C
	C

4

C

5

1 - 2 bar

A

6

B

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WATER TREATMENT

IMPORTANT: Debris from the system can damage the boiler and reduce efficiency. Failure to comply with the guidelines for the use of water treatment with the appliance will invalidate the appliance warranty.

FLUSHING (Central Heating):

1Switch off the boiler.

Open vented systems only: turn off the water to the system header tank.

Open all radiator valves/drain cocks (C) and drain the system while the appliance is hot. Close drain cocks (C).

2Add a suitable flushing agent (F) and refill the system at the correct strength for the system condition in accordance with the manufacturer's instructions.

Vent the boiler (there are two vent points

(A)at the top of the secondary heat

exchanger. Only one may be in use, the other may be obscured by side fluing. Always vent (A) and the vent screw (B) on

the pump and all radiators.

Run the boiler/system at normal operating temperature for the time stated by the flushing agent manufacturer.

3Drain and thoroughly flush the system and boiler to remove the flushing agent and debris (C).

INHIBITOR (Central Heating):

4Check drain cocks (C) and manual air vents are closed and all radiator valves are open.

5Add a suitable inhibitor (I), (or combined inhibitor/anti-freeze if the system is exposed to freezing conditions) to the heating system in accordance with the manufacturers instructions.

The inhibitor or combined inhibitor/anti-freeze must not cause damage to the materials within the boiler (mild steel, stainless steel, copper and brass) and any other materials/components within the system.

Open vented systems only: turn on the water to the system header tank and allow the system to fill.

Sealed systems only: fill the system to between 1 and 2 bar via a WRAS approved filling loop. Check the system pressure during venting and repressurise if necessary.

6Vent the boiler (there are two vent points

(A)at the top of the secondary heat exchanger. Only one may be in use, the other maybe obscured by side fluing. Always vent (A) and the vent screw (B) on the pump and all radiators; retighten vents when complete.

7Record the date when the inhibitor was added to the system on the guarantee card.

NOTE: The concentration level of inhibitor in the system should be checked every 12 months or sooner if system content is lost.

The addition of sealing agents to the system water is not advised as this can cause problems with deposits left in the heat exchanger and invalidate the appliance and heat exchanger warranty .

WATER TREATMENT

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