
• The installation must conform with local codes or, in the absence of local codes with the National Fuel Gas Code, ANSI Z223.1. • The heater and its individual shut-off valve must be disconnected from the gas supply piping system while performing any tests of the gas supply piping system at pressures in excess of 1/2 psig. • The heater must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure testing of the gas supply piping system at