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TABLE OF CONTENTS
CHAPTER 4 - BOILER PIPING ........................................................................................... 13
4.1. General Piping Requirements ...................................................................................................... 13
4.2. Pressure Relief Valve ....................................................................................................................13
4.3. Boiler Air Vent ................................................................................................................................ 14
4.4. Low Water Cutoff Device ..............................................................................................................14
4.5. Additional Limit Control ................................................................................................................ 15
4.6. Backflow Preventer ....................................................................................................................... 15
4.7. Boiler System Piping Applications ............................................................................................... 15
4.8. Expansion Tank and Makeup Water ............................................................................................16
4.8.1 Diaphragm Expansion Tank ................................................................................................ 16
4.8.2 Closed-Type Expansion Tank .............................................................................................. 16
4.9. Circulator ....................................................................................................................................... 17
4.10. Sizing Primary Piping .................................................................................................................... 17
4.11. Domestic Hot Water System Piping ............................................................................................ 17
4.12. System Piping - Zone Circulators ................................................................................................ 17
4.13. System Piping - Zone Valves ........................................................................................................ 17
4.14. System Piping - Through Boiler ................................................................................................... 17
4.15. System Piping - Radiant Heating ................................................................................................ 23
4.16. System Piping - Special Application ........................................................................................... 23
4.17. System Piping - Multiple Units Installation ................................................................................ 23
CHAPTER 5 - INSTALLING VENT/COMBUSTION AIR & CONDENSATE DRAIN ..........25
5.1. Installing Vent and Combustion Air ............................................................................................ 25
5.2. Installing Condensate Drain Assembly ...................................................................................... 25
CHAPTER 6 - GAS PIPING ................................................................................................. 27
6.1. Gas Supply Piping Connection .....................................................................................................27
6.2. Natural Gas ................................................................................................................................... 28
6.2.1 Pipe Sizing ........................................................................................................................... 28
6.2.2 Supply Pressure Requirements ........................................................................................ 28
6.3. Propane Gas ................................................................................................................................. 29
6.3.1 Pipe Sizing ........................................................................................................................... 29
6.3.2 Supply Pressure Requirements ........................................................................................ 29
CHAPTER 7 - INTERNAL WIRING ...................................................................................... 33
7.1. General Requirements ................................................................................................................. 33
7.2. Fuse Locations ............................................................................................................................. 33
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