VMP-IOMM-2018-2
Fulton Ltd
Page 12
INSTALLATION - 2
2.5
FUEL SUPPLY
WARNING
Do not change the boiler fuel without consulting the boiler manufacturer.
!
2.5.1
GAS SUPPLY
Verify that the burner is suitable for the type of gas being supplied. Ensure that the piping from
the meter is the correct size, and that a gas cock is inserted in the line between the boiler and
the meter. To avoid pressure drops, eliminate all unnecessary bends and elbows in the pipework
between the gas meter and the boiler. A scale trap is provided on the gas train and should be
used.
Burners suitable for operation on natural and manufactured gas are supplied with gas trains or a
modular gas head.
A minimum pressure of 18/23 mbar at the specified flow rate, is required at the gas train for
natural gas installations and a minimum pressure of 50 mbar is required at the gas train for
manufactured/L.P gas installations.
If the gas supply is in excess of 150 mbar for Natural gas a suitable regulator is required before
the main gas valve.
Burners arranged for operation on L.P. gas are supplied with gas trains. It is essential that the
MAXIMUM pressure of the gas at the gas train does not exceed 80 mbar and does not fall below
50 mbar. A suitable regulator is required before the main gas valve.
To obtain these pressures, a pressure regulating device or service governor must be fitted to the
supply line from the storage tank to the boiler gas train.
Careful consideration must be given to the siting of LPG storage tanks to prevent over pressure
conditions arising, due to temperature rises caused by solar gain.
The main gas valve is fitted with a bypass system (internal or external depending on the model)
the bypass allows pilot pressure to be maintained whilst the flame is verified.
2.5.1.2
GAS VALVE WITH PILOT GAS LINE
Figure. 9 - Gas Supply
Main gas valve
assembly
Main gas line
isolating valve
Pilot line
ball valve
Pilot line
governor
Pilot line
gas valves
