Atag iR 15 - Gas Connection in General; Natural Gas Connection (NG); Propane Gas Connection (LPG)

Installation & Servicing instructions ATAG iR-Range
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9.4 Gas connection in general
The local gas supplier should be consulted, at the installation planning stage, in order to establish the
availability of an adequate supply of gas. An existing service pipe must NOT be used without prior
consultation with the local gas supplier.
ATAG supplies boilers suitable for natural gas only and boilers for LPG only. Verify the identication
plate on the boiler if the boiler is suitable for the gas kind on site. The boilers cannot be converted to
another kind of gas.
Make sure that the gas pipe work does not contain dirt, particularly with new pipes.
The complete installation MUST be tested for gas tightness and purged as described in the above
code.
Theboilerconnectionisprovidedwithanisolationvalvewith22mmcompressiontting,intowhichthegas
linecanbetted.
9.4.1 Natural gas connection (NG)
The gas supply must comply to the current Gas Safety, Installation & Use Regulations, in accordance with
BS.6891.
The nominal inlet working gas pressure measured at the appliance should be 21 mbar +/- 2 mbar for Nat
gas (G20). Allowing for the acceptable pressure loss of 1 mbar across the installation pipework, it can
be assumed that a minimum permitted operating pressure of 18 mbar will be delivered to the inlet of the
appliance. (Reference BS 6400-1 Clause 6.2 Pressure Absorption). When tested at the gas valve, the
pressure drop from the meter to the gas valve must not be more than 3.8 mbar.
9.4.2 Propane gas connection (LPG)
The LPG installation must comply to the current Gas Safety, Installation & Use Regulations, in accordance
with BS:6891.
Installing of a LPG installation should only be done by a registered LPG installer.
The tank must be provided with a high pressure regulator with a minimum capacity of 24 kg/h to reduce
the tank pressure from 5 to 1.5 bar. The 1.5 bar high pressure gas line should have a minimum diameter of
15mm. In the high pressure gas line a house pressure regulator must be installed. When tested at the gas
valve, the pressure drop from the pressure regulator to the gas valve must not be more than 3.7 mbar.