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3.2.8 Measuring combustion efficiency
Perform the following to determine combustion efficiency.
- measure the combustion air temperature.
- measure the temperature of the flue gas and the percentage of
CO
2
taken through the holes in the flue gas duct.
Take these readings with the heating unit running, after making
sure the Bacharach index is less than 1.
3.2.9 Connecting to the power mains
The heating unit must be connected to a
230V – 50 Hz
power
supply.
The power cable must be made of rubber.
Do not use PVC cables, which have low temperature resistan-
ce and tend to deteriorate quickly.
Make sure all the wires are connected correctly.
During installation, comply with the applicable standards
and laws, which should be taken as incorporated in full in
this manual.
A two-pole switch must be fitted before the heating unit to allow
maintenance to be carried out in safety. The power line must be
protected by a differential magnetothermal switch with a suitable
breaking capacity.
The mains supply must be properly earthed.
This safety precaution is mandatory. In case of doubt, have
the whole system checked carefully by a qualified electrician.
This safety precaution is mandatory. In case of doubt, have the
whole system checked carefully by a qualified electrician.
The manufacturer can in no way be held liable for damage or
injury caused by failure to earth the system properly. The DHW,
CH and fuel pipes are not suitable for earthing purposes.
3.2.10 Plumbing connections
CENTRAL HEATING
Before installing the heating unit we recommend you clean the sy-
stem to remove any impurities from the various components which
might damage the circulating pumps or the heat exchanger.
The central heating flow and return pipes must be connected
using G 3/4 fittings.
When determining the size of the heating circuit pipes, it is essen-
tial to take into account the load losses induced by the radiators,
any thermostatic valves, radiator cut-off valves and the configura-
tion of the system.
DOMESTIC HOT WATER
The flow and return pipes must be connected to the respective G
1/2” fittings on the heating unit.
The mains pressure must not be more that 6 bar, otherwise a pres-
sure reducer needs to be provided.
The pressure in the DHW circuit should be between 3 and 4 bar.
The hardness of the mains water determines how often the heat
exchanger coil needs to be cleaned.
ATTENTION
- If the water is particularly hard it may be necessary to provide
a domestic water softener with a device for dosing a specific
product for treating drinking water in compliance with the
applicable laws. It is always advisable to treat water with a
hardness of more than 20°F.
- Due to its pH value, water supplied from normal water
softeners may not be compatible with some components of
the heating system.
- The safety valves should be connected to a drain, otherwise
the boiler room may get flooded when they operate.
The manufacturer can in no way be held liable for damage caused
by failure to take these basic safety precautions.
Picture 14 shows the plumbing system diagram of the heating
unit.
3.3. Filling the Central Heating Circuit
When all the connections have been made, the CH circuit can
be filled with water. This must be done carefully in the following
order:
- Open all the radiator air valves and the automatic relief valves on
the heating unit.
- Remove the front panel by pulling and lifting it toward the out-
side.
- Load the boiler by opening the tap anticlockwise (as shown in
pic. 2) to let the water in.
- Close the radiator air valves as soon as water starts to come out.
- Using a gauge, check that the pressure is 1/1.3 bar.
- Turn off the filling tap and open all the radiator air valves again.
- Switch on the heating unit and allow it to heat up, then switch it
off and bleed all the radiators again.
- Allow the system to cool down and check the water pressure is
within the correct range (1/1.3 bar).
WARNING
As far as domestic heating systems treatment of water is
concerned, in order to optimize performance and safety, to
preserve these conditions over time, to ensure long-lasting
regular operation of auxiliary equipment as well, and to
minimize energy consumption, thereby integrating current
laws and standards it is advisable to use specific products
that are suitable for multi-metal plants.
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