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• 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 test pressures equal to or less than 1/2 psig. • Any safety screen or guard removed for servicing the heater must be replaced prior to operating the heater. • Keep heater area clear and free from combustible materials, gasoline and other flammable vapors and liquids. • Do not use these appliances if any part has been under