Bedienungsanleitung Rendamax R3400 (Seite 38 von 51) (Englisch)

569768

Zoom out

Zoom in

Vorherige Seite

1/51

Nächste Seite

Rendama

Doc890/3456CV02B 41

5.4.4 Water temperature

The maximum permissible temperature of the water ﬂ ow can be set at 90°C. If the high limit

thermostat functions at 100°C, the appliance shuts down and locksout and does not restart auto-

matically when the temperature falls below the high limit tem perature setting.

5.4.5 Water quality

The composition and quality of the system water has a direct inﬂ uence on the performance of

the whole system and the life of the appliance. Unsuitable addition and use of chemicals, water

softeners, oxygen binders, de-aerators, aerators, and water ﬁ lters all increase the possibility of

faults.

Corrosive elements in certain additives can attack the system, resulting in leakage; deposits of

undesirable sediments can lead to damage to the boiler heat exchanger.

For water hardness, a distinction must be made between:

a Temporary hardness

This is also referred to as carbonate hardness. Deposits are formed at higher temperatures and

are easy to remove.

b Permanent hardness

Minerals (for example, calcium sulphate) dissolved in the water can be deposited as a function

of very high surface temperatures.

In the United Kingdom, water hardness is expressed in mg/litre (ppm) and is given the following

divisions:

Very soft less than 50 ppm

Soft approx. 50 - 160 ppm

Moderately hard approx. 160 - 250 ppm

Hard and very hard over 250 ppm

The system must contain soft to moderately hard water with a water hardness not exceeding

250 ppm with a sup ply temperature of 80°C and ∆T = 20 K.

Before the water is topped up, the hardness and the chloride content of the water must be deter-

mined.

During the construction of larger installations, one of the appli ances may be operational. New

circuits may be regularly switch ed in, which must occur together with the addition of fresh water.

In addition, it can happen that, because of leakage, some circuits must be disconnected, repaired

and re-ﬁ lled. In these circumstances the only appliance in operation often functions at full capac-

ity and the chance of boiler scale forma tion is present. For this reason the make-up water must be

softened. To ensure proper functioning of the appliance and the system, the use of water soften-

ers is recommended.

Large stationary bubbles with widely different compositions can form at “dead points” in the

system (in addition to oxygen and nitrogen, hydrogen and methane have also been detected).

Oxygen promotes corrosion. Corrosion products, together with other pollutants, form a sludge

deposit (magnetite) which caus es pitting under the inﬂ uence of oxygen.

The use of an air separator with an automatic de-aerator is strongly recommended. This should

preferably be ﬁ tted in a horizontal section of the return pipe to the pump. If a vertical low velocity

header is employed, the air separator should be ﬁ tted above the header.

The chloride concentration must not exceed 200 mg/l. If this level is exceeded, the cause must be

located. Compare the chloride concentration of the additional water with that of the system water.

If this concentration is higher, this indicates evaporation if no chloride containing materials have

been added. If chloride is present in high concentrations the water will be more aggressive (due

to, among other things, incorrectly regeneration of the water softener). The system must then be

ﬂ ushed out and re-ﬁ lled with low chloride content water.

To reduce the effects of unnecessary wear and blockages resulting from any pollution present we

advise the use of a ﬁ lter system with a mesh opening of 100 microns. Always ﬁ t this in the return

pipe of the secondary part of the system.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Rendamax R3400 Seite 38

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info