Commissioning - Rinnai E75CN Installation & Servicing Instructions Manual

12

Commissioning

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NOTICE
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WARNING
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NOTICE
Installing casing
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WARNING
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DANGER
Pump commissioning
figure 26
60
Work on the boiler must be carried out by a competent person, using
correctly calibrated instruments with current test certifi cation.
These installation instructions are intended for professional installers, who
have the necessary knowledge and are approved for working on heating and
gas systems.
Before the boiler is fi red, ensure that the boiler and the system are well de-aerated
and free of air. Purge the gas line between the gas meter and the boiler.
Failure to properly commission the boiler as described in section 13 may
result unreliable burner operation, reduced component life, and unsafe boiler
operation.
The boiler and its individual shut off valve must be disconnected from the
gas supply piping system during any pressure testing of that system at test
pressures in excess of 1/2 PSI (3.5kPa).
To commission the boiler the casing has to be removed.
- remove the 4 screws A,B,C and D in the quick releases of the casing (fi gure 25);
- remove the screw E behind the door on the front of the casing (fi gure 25);
- remove it towards the front.
The boiler settings, such as burner pressure and adjustment of the air quantity are
unnecessary in most cases, due to the fact that the boiler operates with a zero pressure
control. This means the correct gas quantity is controlled by the suction operation of
the fan. The fi ne adjustment of the zero pressure, which is carried out at the factory
is once-only, which means that adjusting of this value is unnecessary. Only in case
fi gure 25
of replacing of the gas valve, venturi and/or fan the zero pressure adjustment has
to be checked and, if necessary, adjusted to the right value.
The venturi must always be checked and adjusted when it is out of range see
section 12.3 on O
Always check the installation of all parts through which gas fl ows (by bubble
test using leak-search spray).
Pump commissioning procedure should be followed before the boiler is fi red for the
fi rst time:
1. Remove the vent pump screw
2. Use a small fl at head screw driver to ensure the impeller spins freely.
3. When the impeller spins freely and water exits though the vent port the pump is
ready for operation.
4. Replace the vent screw
During the commissioning of the boiler the Rinnai Installation, Commissioning, and
Service card must be fi lled out.
adjustment.
2