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9.0
GAS SUPPLY
The Lochinvar TTW is suitable for use on second and third family gasses 2H - G20 - 20mbar and 3P - G31 - 37mbar.
Details relating to Natural Gas (2H) appear below; for details relating to Propane (3P) please refer to Section 17.1.4
GAS TYPE SELECTION.
9.1 SERVICE PIPES
The local gas distributor must 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 distributor.
9.2 METERS
The local gas distributor contractor will connect a new gas meter to the service pipe. An existing gas meter should
be checked, preferably by the gas distributor, to ensure that it is adequate to deal with the rate of gas supply
required.
9.3 GAS SUPPLY PIPES
Supply pipes must be fitted in accordance with IGE/UP/2. Pipework from the meter to the equipment must be of
adequate size. The complete installation must be purged and tested as described in IGE/UP/1. Refer to Section
17.1.4 GAS TYPE SELECTION for information on LPG installation guidance.
9.4 BOOSTED SUPPLIES
Where it is necessary to employ a gas pressure booster, the controls must include a low-pressure cut-off switch at
the booster inlet. The local gas distributor must be consulted before a gas pressure booster is fitted. For details
of how to connect a low-pressure cut-off switch, please refer to Section 15.0: ELECTRICAL INSTALLATION.
9.5 PLANT-ROOM CONTROL VALVE
A manual valve for plant-room isolation must be fitted in the gas supply line. It must be clearly identified and
readily accessible for operation, preferably by an exit.
9.6 EQUIPMENT GAS SYSTEM LEAK CHECK
An approved isolating valve and union should be installed for each unit in a convenient and
safe position and be clearly marked.
Ensure that the manual gas service valve is in the OFF position. Although the equipment receives a gas leak check
and gas train component integrity check prior to leaving the factory, transit and installation may cause disturbance
to unions, fittings and components. During commissioning, a further test for tightness should be carried out on
the equipment gas pipework and components.
Care must be taken not to allow leak detection fluid on or near any electrical parts or
connections.
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