Bedienungsanleitung Remeha Gas 3002 ECO (Seite 11 von 36) (Englisch)

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5.2.4 Water treatment

The system should be filled with mains cold water (for the

UK this will usually have a pH of between 7 and 8).

Pressurised installations with a boiler/system content

ratio of 1:10 or less should not require water treatment,

provided that the following conditions apply:

1. The system is flushed thoroughly to remove all fluxes

and debris and filled completely once.

2. Make up water is limited to 5% per annum.

3. The hardness of the water does not exceed 360 ppm.

(20

D).

All scale deposits will reduce the efficiency of the boiler

and should be prevented. However provided the above

is complied with any scale produced will not be too

detrimental to the boiler efficiency and will not reduce the

anticipated life expectancy of the boiler.

NOTE: Scale desposits in excess of 5mm will reduce

boiler efficiency and greatly increase the risk of

premature casting failure

As most systems contain a variety of metals wich can

react with each other to cause corrosion. It is considered

good practice to provide some form of water treatment

(especially in open vented systems) in order to prevent or

reduce the following.

a) Metallic corrosion

b) Formation of scale and sludge

c) Microbiological contamination

d) Chemical changes in the untreated system

water

Suitable chemicals and their use should be discussed

with a specialist water treatment company prior to

carrying out any work.

5.2.3 Water circulation

The water flow through the boiler is limited to an amount

corresponding with a differential temperature across the

boiler of 45°C. If the differential temperature exceeds

45°C the boiler is turned off and blocked.

See also para. 7.5.3. As soon as the flow is again suffi-

cient, the boiler will automatically restart.The minimum

water circulation in the boiler is determined by the

following formula:

Output boiler in (kW) = ..... m

This circulation prevents, for example, activation of the

high limit thermostat when the mixing valves of the instal-

lation close when the boiler is in operation (to dissipate

residual heat).

The maximum water circulation in the boiler is

determined by the formula:

Output boiler in (kW) = ..... m

9.3

The specification of the system and manufacturers rec-

ommendations must be taken into account, along with

the age and codition of the system. New systems should

be flushed thoroughly to remove all traces of flux, debris,

grease and metal swarf generated during installation.

Care to be taken with old systems to ensure any black

metallic iron oxide sludge and other corrosive residues

are removed, again by thoroughly flushing, ensuring that

the system is drained completely from all low points.

NOTE: Please ensure that the new boiler plant is not in

circuit when the flushing takes place, especially if

cleansing chemicals are used to assist the proces.

Under no circumstances is the boiler to be operated

with cleaning chemicals in the system

To Summarise: Minimise water loss

Prevent pumping over in open vented

systems

Provide adequate air venting at all high

points

Maximum chlorine content of 200 mg/1

Take advice on suitability of inhibitors

for use with aluminium

MAX pH of 9 when using additives

If water treatment is used then we recommend that the

following products be used:

‘Copal’ manufactured by

Fernox Manufacturing Company Ltd.

Britannia Works

Clavering

Essex, CB1L 4QZ

Tel No: 0179 955 0811

Fax No: 0179 955 0853

Sentinal ‘X100’ manufactured by

BetzDearborn

Sentinal

Foundry Lane

Widnes

Cheshire WA8 8UD

Tel No: 051 495 5351

Fax No: 0151 420 5447

For the correct dosage and for further information on

water treatment or system cleaning we advise direct

contact either of the above companies.

5.2.5 Noise levels

The noise level in the boiler house, measured at a dis-

tance of 1 meter around the boiler, is approx. 60 dBA,

which means that it is usually not necessary to use

sound absorbent material.

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