Checking For Leaks; Gas Type Conversion; Conversion For Boiler Size 90 And 120 Kw - Buderus Logano plus GB312 Installation And Maintenance Instructions Manual

6
Commissioning
6.4

Checking for leaks

Prior to commissioning, check all new line sections on the
gas side for external gas tightness.
DANGER: Risk of explosion!
Leaking gas lines and gas connections
create the risk of explosions.
B Carry out an appropriate tightness test
with a foaming agent.
NOTICE: System damage!
B Prior to checking for leaks, cover the areas
at risk, e.g. the internal water pressure
sensor and the return temperature sensor
at the boiler return.
B Never spray or let leak detection agent
drip onto cable entries, plugs or electrical
cables/leads.
B Check the new pipe section, including the seal at the
gas train, for external leaks.
The test pressure on the gas train inlet must be no
higher than 150 mbar.
If a leak is found during the tightness test,
carry out a tightness test on all connections
using a foam leak detector. The agent must
be approved for gas tightness testing.
B Never allow the agent to come in contact
with electrical cables.
B Confirm the tightness test with an entry into the
commissioning report (
30
Chapter 6.23).
6.5

Gas type conversion

If you discover that the boiler has been ordered for the
wrong gas type, convert it to the correct gas type, and
update the type plate accordingly.
6.5.1

Conversion for boiler size 90 and 120 kW

The boiler is converted to a different gas type by replacing
the gas restrictor.
Use only the gas restrictors listed in Tab. 15.
Boiler size Gas type
90/120 kW Natural gas H
(Wobbe index
14.9 kWh/m
Natural gas L - DE
(Wobbe index
12.8 kWh/m
Natural gas L - NL
(Wobbe index
12.2 kWh/m
Tab. 15
Fig. 24 Replacing the gas restrictor (boiler size 90/
120 kW)
1 Gas restrictor
Logano plus GB312 - Subject to technical modifications.
Gas restrictor
diameter
15.7
3
)
15.0
3
)
14.8
3
)