7
5
STARTING
WARNING: Before start up insert wholly turbolaters into the smoke tubes ensuring that they have
been pushed inside for at least 100 mm.
5.1 PRELIMINARY CHECKS
Before starting the boiler, check that:
-
The
rating plate
specifications and power supply network (electricity, water, gas or fuel oil)
specifications correspond;
-
The burner
power range
is compatible with the power of the boiler;
-
The boiler room also contains the instructions for the burner;
-
The
flue gas exhaust pipe
is operating correctly;
-
The
air inlet supply
is well dimensioned and free from any obstacle;
-
The manhole, the smokebox and the burner plate are closed in order to provide a complete flue gas seal;
-
The system is
full of water
and that any
air pockets
have therefore been eliminated;
-
The
anti-freeze
protections are operative;
-
The water
circulation pumps
are operating correctly.
-
The expansion vessel and the safety valve(s) have been connected correctly (with no interception) and
are properly operating.
-
Check the electrical parts and thermostat operation.
5.2 WATER TREATMENT
The most common phenomena that occur in heating systems are:
- Scaling
Scale obstructs heat transfer between the combustion gases and the water, causing an abnormal
increase in the temperature of the metal and therefore reducing the life of the boiler.
Scale is found mostly at the points where the wall temperature is highest and the best remedy, at
construction level, is to eliminate areas that overheat.
Scale creates an insulating layer which reduces the thermal transfer of the generator, affecting system
efficiency. This means that the heat produced by burning the fuel is not fully exploited and is lost to the flue.
Scale diagram
Key
%
% fuel not used
mm
mm of scale
- Corrosion on the water side
Corrosion of the metal surfaces of the
boiler on the water side is due to the passage of dissolved iron through its ions (Fe+). In this process the
presence of dissolved gases and in particular of oxygen and carbon dioxide is very important. Corrosion
often occurs with softened or demineralised water which has a more aggressive effect on iron (acid water
with Ph <7): in these cases, although the system is protected from scaling, it is not protected against
corrosion and the water must be treated with corrosion inhibitors.
5.3 FILLING THE SYSTEM
The water must enter the system as slowly as possible and in a quantity proportional to the air bleeding
capacity of the components involved. Filling times vary depending on the capacity and characteristics of the
system but should never be less than 2 or 3 hours.
In the case of a system with
closed expansion vessel
, water must be let in until the pressure gauge
indicator reaches the static pressure value pre-set by the vessel.
Heat the water to maximum temperature and never over 90°C. During this operation the air contained in the
water is released through the automatic air separators or through manual bleed valves. The water
discharged from the system with elimination of the air is made up by the automatic or manual filling valve.
Summary of Contents for SCP PLUS 3000
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