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Commissioning
6.8 Changing over to a different gas type
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This changeover may only be carried out by an authorised specialist or by
the Hoval Customer Service.
Changeover from natural gas H to natural gas L
An emission check is required when changing to a natural gas of lower calo-
rific value; a correction of the CO
2
(O
2
) value may be necessary (see point
6.7 Setting the gas flow rate).
§
Changeover from natural gas to liquid gas
The applicable local provisions for operating a boiler with liquid gas are to be
complied with.
VKF, DVGW, ÖVGW
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Changeover only possible by means of a conversion kit.
Ensure that the fuel type in the measuring device has been set correctly.
The conversion kit contains:
gas pressure switch.
yellow sticker.
Exchange Venturi VF051 (for UltraGas
®
(90) only)
Removing the gas pressure switch:
Ensure that the liquid
gas line is free of any air.
Any air in the liquid gas
line can have a negative
influence on the flue gas
values.
Close the gas shut-off valve.
Set the main system switch to “0”.
Take off the boiler hood.
Remove the gas pressure switch.
Install the liquid gas pressure switch:
Install the liquid gas pressure switch.
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Set the AMP flat pin to position 1 and 3.
Affix the yellow sticker on the boiler name
plate.
Open the gas valve.
Set the main system switch to “1”.
Adjust fan speed of rotation according to the
list of parameters “Liquid gas adaptations“.
Set the CO
2
(O
2
) content to CO
2
= 9.9 - 10.2
(O
2
= 5,9 - 5,5) vol% (dry).
(flow setting operation as described in section
6.7)
Install the boiler hood.
6.9 Handover to the user
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The manufacturer of the unit is responsible for providing operating instruc-
tions for the complete system.
The following must be carried out during handover to the user:
Provide instructions in the operation and maintenance of the system.
Handover of all the instruction manuals and documents.
Explain to the user that these instructions must be kept with the system at
all times.
Written confirmation of receipt of instruction.
Handover protocol see page 52.
