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First lighting
– Follow the instructions which are supplied with
the burner.
– Set the control thermostat (34) Fig. 4 to
about 80 °C and check that this and the limit
thermostat operate correctly.
– The two stage basic control panel (38), is
prepared for controlling the burner in two
stages, and therefore incorporates two control
thermos- tats (34) Fig. 4. The thermostat
regulated to lower temperatures controls
the second stage, whilst the other, which is
regulated to higher temperatures, controls the
first stage.
– Vent the installation again and check that the
radiators warm up satisfactorily.
Important recommendations
– If there is danger of freezing, add some anti-
freeze product to the water.
– Keep the same amount of water in the system
at all times; water should only be added when
topping up is absolutely necessary.
– Uncontrolled topping up with water may cause
limescale deposits in the boiler, damage it
seriously and reduce its performance.
– We recommend that the properties of the water
in the system be:
pH between
7.5 and 8.5.
Hardness:
8 to 12 French degrees (*).
(*) One French degree is equivalent to 1 gram of
calcium carbonate per 100 litres of water.
– Any work on the boiler or the installation must
be performed by qualified personnel.
Prevention of condensation
Condensation in boilers is harmful, especially
when they are made of steel. With a combustion
set to 25% excess air, boilers are suitable for
operating with a minimum boiler temperature and
return temperature, showed in the the following
table:
Requirement
1 stage or
Burner
2 stage
operation
65 – 100%
Oil
37°C
Minimum return
Temperature
Gas
40°C
Oil
52°C
Minimum boiler
Temperature
Gas
58°C
When installation requires lower temperatures
than those of the table, it will be necessary to add
a by-pass pump to raise the return temperature
and/or a 3 way mixing valve to have a flow
temperature lower than boiler temperature.
Pr
C
Pj
Vm Mixing valve
M
Sm Flow sensor
Se Outdor sensor
The "Pr" by-pass pump can be calculated for a
water flow about 50% of the main heating pump
of the installation "Pi" and with possibility to
overcome the boiler pressure drop (always less
than 0,1 bar).
Note:
If after following the before recommendations, any
signs of malfunction or failure is detected in the
boiler or installation, please contact with your local
distributor or any authorized After Sales Service.
Attention:
Characteristics and performance qualities are
2 stage
Modulating
50 – 100%
35 – 100%
39°C
42°C
42°C
48°C
53°C
55°C
60°C
62°C
Byass pump
Boiler
Heating pump
Mixing valve motor
29
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