4
LP-179 REV. 3.21.14
The latest version of the National Electrical Code, NFPA No. 70. NOTE: The gas manifold and controls met safe lighting and other performance criteria when undergoing tests specified in ANSI Z21.10.3
– latest edition.
TABLE OF CONTENTS
PART 1
– GENERAL SAFETY INFORMATION .......................................................................................................................... 5
A. PRECAUTIONS .......................................................................................................................................................................... 5
B. IMPROPER COMBUSTION ........................................................................................................................................................ 6
C. GAS ............................................................................................................................................................................................ 6
D. WHEN SERVICING THE HEATER ............................................................................................................................................. 6
E. HEATER WATER........................................................................................................................................................................ 6
PART 2
– BEFORE YOU START ................................................................................................................................................ 7
A. WHAT’S IN THE BOX ................................................................................................................................................................. 7
B. HOW THE HEATER OPERATES ............................................................................................................................................... 7
C. OPTIONAL EQUIPMENT ........................................................................................................................................................... 8
PART 3
– PREPARE WATER HEATER LOCATION .................................................................................................................. 8
A. BEFORE LOCATING THE HEATER .......................................................................................................................................... 9
B. LEVELING .................................................................................................................................................................................. 9
C. CLEARANCES FOR SERVICE ACCESS ................................................................................................................................. 10
D. RESIDENTIAL GARAGE INSTALLATION ................................................................................................................................ 10
E. EXHAUST VENT AND INTAKE PIPE ....................................................................................................................................... 10
1. DIRECT VENT INSTALLATION OF EXHAUST VENT AND INTAKE PIPE ......................................................................................................... 11
2. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED SPACE ................................................................................ 11
F. PREVENT COMBUSTION AIR CONTAMINATION .................................................................................................................. 11
G. REMOVING A HEATER FROM A COMMON VENT SYSTEM................................................................................................. 12
H. WATER CHEMISTRY ............................................................................................................................................................... 13
PART 4
– HEATER PIPING ....................................................................................................................................................... 15
A. GENERAL PIPING INFORMATION .......................................................................................................................................... 15
B. SCALDING ................................................................................................................................................................................ 16
C. TEMPERATURE AND PRESSURE RELIEF VALVE................................................................................................................ 16
D. BACKFLOW PREVENTER ....................................................................................................................................................... 16
E. POTABLE EXPANSION TANK ................................................................................................................................................. 16
F. WATER PIPING ........................................................................................................................................................................ 17
G. AUXILIARY CONNECTIONS ................................................................................................................................................... 17
H. PIPING DIAGRAMS .................................................................................................................................................................. 18
PART 5
– VENTING, COMBUSTION AIR AND CONDENSATE REMOVAL............................................................................ 25
A. GENERAL ................................................................................................................................................................................. 25
B. APPROVED MATERIALS FOR EXHAUST VENT AND INTAKE PIPE .................................................................................... 25
C. REQUIREMENTS FOR INSTALLATION IN CANADA .............................................................................................................. 26
D. EXHAUST VENT AND INTAKE PIPE LOCATION.................................................................................................................... 27
E. EXHAUST VENT AND INTAKE PIPE SIZING .......................................................................................................................... 28
