24
4
Gas characteristics
The gas characteristics should be obtained from the gas
board. The Wobbe index W
S
should be checked
according to the valid gas groups. The gas connection
pressure must lie within the following ranges:
•
Natural Gas
17...30 mbar
•
Liquid Petroleum Gas
25...57.5 mbar
For higher gas connection pressures the
WTC should be fitted with an additional
gas pressure switch.
If the gas pressure is lower, contact the
gas board. Do not commission the WTC.
4.7 Gas side connection
Gas installation by qualified personnel only!
Local regulations and codes of practice, as well as
regulations from the local gas board must be observed.
Venting the gas supply line
The local gas board or their appointed sub-contractor are
responsible for venting the gas line. If work such as
replacing components, valve train or gas meter, has been
carried out on the gas supply line, recommissioning may
only be carried out once the appropriate components
have been vented by the gas board or their appointed
sub-contractor.
Unit connection
Use the elbow or straight gas connection cock available
as an accessory, to connect the unit to the gas supply.
The gas board will also inform you if you require an
approved gas filter or thermal shut off valve required to
comply with some regional building laws.
Note:
Due to the fully automatic compound
regulation the setting to a gas type within a
gas family is not required.
Safety solenoid valve
ATTENTION
Liquid Petroleum Gas safety valve
For liquid petroleum gas operation below ground level it
is recommended to fit an additional safety solenoid valve
in the gas supply line to avoid the accumulation of gas
near the boiler room.
☞
Connection to plug configuration Ch . 4.6.1,
plug MFA (5) or VA (6).
☞
Parameter setting of output MFA or VA to LPG
safety valve. Set parameter P13 or P14 (see Ch.
6.3.3) to parameter value 0.
Control via MFA:
P13 = 0
Control via VA:
P14 = 0
☞
Conversion of type of gas Natural Gas - Liquid
Petroleum Gas, see appendix.
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