Worcester 18/25 Instruction Manual download pdf (Page 35)

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):

1Switch off the boiler.

Open vented systems only: turn off the

water to the system header tank.

Open all radiator valves/drain cocks (B) and

drain the system while the appliance is hot.

Close drain cocks (B).

2Add 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 all radiators.

Run the boiler/system at normal operating

temperature for the time stated by the

flushing agent manufacturer.

3Drain and thoroughly flush the system to

remove the flushing agent and debris.

INHIBITOR (Central Heating):

4Check drain cocks and manual air vents

are closed and all radiator valves are open.

5Add a suitable inhibitor, (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.

6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 maybe obscured by side fluing.

Always vent (A) and all radiators; retighten

vents when complete.

7Record 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 .

2

1

3

4

5

6

1 - 2 bar

B

B

B

B

A

A

B

B

A

A

WATER TREATMENT

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25

8 716 106 256C (03/2010)

35

COMMISSIONING

8 716 106 256 C 03.10 30/3/10 14:24 Page 35

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