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Regulations and operating conditions
6 720 645 817 (2010/09)
43
6 Regulations and operating conditions
6.1 Extracts from regulations
The Suprapur gas condensing boilers meet the
requirements of DIN-EN 677, the EC Efficiency Directive,
the Gas Appliances Directive and the EMC/LV Directive.
Observe the following regarding creation and operation
of the system:
Technical building rules
Legal regulations
Local regulations
Installation, gas connection, flue gas connection,
commissioning, power supply, maintenance and repair
work must only be carried out by authorised contractors.
Permits
The installation may need to be notified to and approved
by the relevant gas supply utility.
We recommend clarifying the match between boiler and
flue system with the relevant bodies at the planning
stage.
Notify the relevant issuing authority prior to
commissioning. It may be necessary to obtain a permit
for the flue system and the condensate line to the public
sewer system at regional level.
Inspection/maintenance
Keep the system in good order and clean it regularly
(recommendation: every two years). The entire system
should be checked annually for perfect function.
Regular inspection and, if required, maintenance are
prerequisites for safe and economical operation.
6.2 Fuels
The Suprapur gas condensing boilers are suitable for
natural gas H or L.
The gas quality must comply with the requirements of
the DVGW Code of Practice G 260 [Germany]. Industrial
gases containing sulphur are unsuitable for the gas
burner.
The supply pressure must lie within the range specified
for each gas type. The supply pressure is the flow
pressure at the gas connection of the boiler.
If the supply pressure for the gas type used exceeds the
value in the table, install an additional gas pressure
regulator upstream of the boiler.
6.3 Operating conditions
Gas type Supply pressure
p
min
p
nom
p
max
[mbar] [mbar] [mbar]
Natural gas H 18 20 24
Natural gas L 18 20 24
Tab. 22 Supply pressures for different gas types
Δϑ
max
Minimum
boiler water
flow rate
Max. water
flow rate
Minimum
boiler water
temperature
Operating
interruption
Heating circuit
control unit with
heating mixer
Minimum return
temperature
Full load = 30 K
Partial load = 40 K
No requirements
Results from
ΔT=8K
No requirements
To transfer the
max. output
ΔT must be < 30 K
Tab. 23 Suprapur operating conditions
43


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