CONTENTS
I NTRODUCTION ........................................................................................................................................................ 1
REGULATORS Simple (Line) Pressure-Reducing Gas Regulator.............................................................................................. 5 Atmospheric Regulator (Zero Governor)............................................................................................................ 6 Atmospheric Regulator Supplying a Premix Burner System.........................................................................7 Operation of a Cross-Connected Air/Gas Ratio Regulator Supplying a Nozzle-Mix Burner System.................................................................................................... 8 Pressure Taps for Cross-Connection Impulse Lines........................................................................................ 9 Taps for Measuring Chamber (Furnace) Pressure........................................................................................... 9 PREMIX SYSTEMS Operation of an Aspirator Mixer........................................................................................................................10 Installation and Lighting of Premix Systems.....................................................................................................11 Adjustment of Premix Systems............................................................................................................................12 Premix System in Use............................................................................................................................................13 Effect of Pressure or Suction in Combustion Chamber on Control with a Zero or Atmospheric System.....................................................................................14 Effect of Combustion Chamber Pressure or Suction on Burner Capacity - Premix System........................................................................................................15 Trouble-Shooting Air/Gas Ratio Regulators-- Atmospheric Service on Premix Systems.................................................................................................16 Trouble-Shooting Premix Burners....................................................................................................................... 17 Premix Burner Configurations.............................................................................................................................18 NOZZLE-MIX SYSTEMS Operation of a Cross-Connected Air/Gas Ratio Regulator..........................................................................19 Adjustment of High Fire Air/Fuel Ratio.............................................................................................................20 Adjustment of Air/Fuel Ratio at Low Fire Rate.................................................................................................21 Summary - Practical Air/Fuel Ratio Adjustment.............................................................................................23 Regulator Selection................................................................................................................................................24 Regulator Installation - General.........................................................................................................................25 Installation for Premix Burners...........................................................................................................................26 Installation for Nozzle-Mix Burners................................................................................................................... 27 Lighting and Adjustment......................................................................................................................................29 Servicing...................................................................................................................................................................30 Gas Pressure Requirements for Cross-Connected Air/Gas Ratio Regulators..........................................32 If Gas Supply Pressure is Low.............................................................................................................................33 Use of a Bleeder....................................................................................................................................................34 Effect of Pressure or Suction in Combustion Chamber on Control with a Straight Cross-Connected System...........................................................................35 Effect of Pressure or Suction in Combustion Chamber on Control with a Cross-Connected System with Bleeder..................................................................36 Effect of Pressure or Suction in Combustion Chamber on Burner Capacity with Nozzle-Mix Burners........................................................................................ 37 Checking Operation of a Cross-Connected Air/Gas Ratio Regulator.......................................................38
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