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Remeha Gas 3002
10
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.
5.2.3 Water circulation
The water fl ow 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 fl ow is again suffi cient, the boiler
will automatically restart.
The minimum water circulation in the boiler is deter-
mined by the following formula:
This minimum ow must be maintained for 5 minutes
after the burners stops fi ring to avoid high temperature
shut-down due to residuel heat gain.
Due to the design and manufacture of the boiler no
specifi c minimum water ow requirements exists other
than hightemperature protection.
The maximum water circulation in the boiler is deter-
mined by the formula:
Output boiler in (kW)
..... m
3
/h
81
Output boiler in (kW)
..... m
3
/h
9.3
5.2.4 Water treatment
The system should be fi lled 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 ushed thoroughly to remove all fl uxes
and debris and lled completely once.
2. Make up water is limited to 5% per annum.
3. The hardness of the water does not exceed 360 ppm.
(200D).
All scale deposits will reduce the effi ciency 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 effi ciency and will not reduce the
anticipated life expectancy of the boiler.
NOTE: Scale desposits in excess of 5mm will reduce
boiler effi ciency 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.
The specifi cation 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 ushed thoroughly to remove all traces of fl ux, 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 ushing, 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 ushing 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.
Keep pH level between 7-11 when using
additives.
Maximum chlorine content of 200 mg/1
Take advice on suitability of inhibitors
10


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