32
COMMISSIONING AND OPERATION
The TRISECAL 3P boilers have been designed
to be used in sliding temperature to improve
the seasonal efficiency in all type of C.H.
systems.
When using the boiler at minimum output,
the smoke temperature can be extremaly
low, also below 160°C.
The turbulators will be pushed to the bottom
of the pipes, against the rear wall of the smoke
chamber.
Do not use automatic filling valves.
The commissioning of the burner must be
performed under the responsibility of a
specialized and well trained burner technician,
authorised by the burner manufacturer.
In that occasion a commissioning report has
to be filled out.
7.1 - PRELIMINARY CHECK
Once all the hydraulic, electrical and fuel
connections have been made, before starting
the boiler we suggest to ascertain that:
-
The expansion vessel and the pressure
relief valve are correctly connected and
are in no way interceptable.
-
The bulb of thermometer, working, high
limit and minimum thermostats are well
secured into their proper bulb holder.
-
The turbulators are correctly fitted in all
the smoke pipes.
-
The C.H. circuit has been washed and
rinsed and is free from solid impurities.
-
The C.H. circuit is filled with water and has
been completely purged.
-
The pumps operate properly.
-
The flow switch, the pressure relief valve,
and the overheating discharge valve, if
any, are adjusted at the right value.
-
The fuel, hydraulic, electricaI and safety
connections are executed in conformity
with national and local requirements in
force.
-
There are no water leaks.
-
The burner has been fitted according to
the instructions of the burner manufacturer.
-
The mains voltage and frequency are
compatible with the burner and the electrical
equipment of the boiler.
-
The burner is adjusted for the fuel type,
among those listed in the burner data plate,
available on the installation site, and the
burner output range is compatible with the
boiler output.
-
In the boiler house there are also the burner
instructions.
-
The C.H. pipes are properly insulated.
-
The C.H. system is capable to absorb the
heat quantity produced at the first start of
the burner, during the test period.
-
The shunt pump is installed as
prescribed in the paragraph 2.5.7.
7.2 - FIRST COMMISSIONING
At the commissioning stage of the boiler a
qualified technician has to perform the following
checks:
-
Internal and external sound test of burner
and fuel feeding pipe;
-
Adjustment of the fuel throughput according
to the nominal input of the boiler (it is
convenient to remember that the nominal
input can be adjusted between the minimum
and the maximum shown in the table of
pages 6 to 9), by sharing the output
between the 1st and the 2nd stage,
knowing that the 1st stage flame can go
down to the 60% of the nominal output
(which at its turn can vary between the
minimum and the maximum depending on
the output requested by the C.H. system).
Proceed, then, in the following way:
-
Open the fuel feeding cock and check that
there are no leaks in the feeding line.
-
Ascertain that all the switches of the
panel board are in OFF position and adjust
the working thermostat to the minimum
position.
-
Switch ON the panel board through the
main switch.
-
Switch ON the C.H. pump: it will start to
rotate as soon as the minimum water
temperature thermostat detects 50°C.
-
Switch the burner ON.
-
Position the working thermostats of 1st
and 2nd stages to the maximum setting
to create a heat request.
During this phase check that:
-
There are no smoke leaks from the front
door, the burner plate and the chimney
connection.
-
There is a draught at the chimney base
between 2 and 4 mm w.g.
-
There are no water leaks.
-
The different thermostats and the other
installation safety devices work properly.
-
The shunt pump operates correctly.
-
The burner ignition is good.
-
The burner characteristics (main
adjustments and nozzle type) correspond
to the boiler data plate.
With a burner properly adjusted it must be
possible to reach easily, from a smoke sample
taken at the chimney base, the values given
below:
1) With light oil having a maximum viscosity
of 1.5 °E at 20 °C:
- CO
2
= 12 to 13 %
- Smoke index < 1
- Smoke temperature = 190 to 210 °C
2) With Natural Gas:
- CO
2
= 9 to 10 %
- Smoke temperature = 180 to 200 °C
(values related to a clean boiler, with water
at 70 °C).
It is suggested to adjust the fuel throughput
to the actual needs of the C.H. installation
without exceeding the a.m. smoke
temperatures and without going below 160 °C
with the boiler at maximum output.
The corrosion caused by acid condensation
of the combustion products is never
covered by the guarante, because it
depends only on the management of the
C.H. system.
7
