In Canada - CGA No. B149 (latest version), from Canadian Gas Association Laboratories, 55 Scarsdale Road, Don Mills, Ontario,
Canada M3B 2R3. Also, Canadian Electrical Code C 22.1, from Canadian Standards Association, 5060 Spectrum Way, Suite 100,
Mississauga, Ontario, Canada L4W 5N6.
Code for the installation of Heat Producing Appliances (latest version), from American Insurance Association, 85 John Street, New
York, NY 11038.
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
A. PRECAUTIONS ................................................................................................................................................................................................ 6
B. IMPROPER COMBUSTION .............................................................................................................................................................................. 6
C. GAS ................................................................................................................................................................................................................. 7
D. WHEN SERVICING THE HEATER ................................................................................................................................................................... 7
E. HEATER WATER ............................................................................................................................................................................................. 7
PART 2 - BEFORE YOU START ................................................................................................................................................ 7
A. WHAT'S IN THE BOX ....................................................................................................................................................................................... 7
B. HOW THE HEATER OPERATES ..................................................................................................................................................................... 7
C. OPTIONAL EQUIPMENT ................................................................................................................................................................................. 8
A. BEFORE LOCATING THE HEATER ................................................................................................................................................................. 9
B. LEVELING ...................................................................................................................................................................................................... 10
C. CLEARANCES FOR SERVICE ACCESS ....................................................................................................................................................... 10
D. RESIDENTIAL GARAGE INSTALLATION ...................................................................................................................................................... 10
E. EXHAUST VENT AND INTAKE PIPE ............................................................................................................................................................. 11
H. WATER CHEMISTRY ..................................................................................................................................................................................... 13
PART 4 - HEATER PIPING ....................................................................................................................................................... 16
A. GENERAL PIPING INFORMATION ................................................................................................................................................................ 16
B. SCALDING ..................................................................................................................................................................................................... 17
D. BACKFLOW PREVENTER ............................................................................................................................................................................. 17
E. POTABLE EXPANSION TANK ....................................................................................................................................................................... 17
F. WATER PIPING .............................................................................................................................................................................................. 18
G. AUXILIARY CONNECTIONS ......................................................................................................................................................................... 18
H. FILLING THE HEATER .................................................................................................................................................................................. 18
I. IMPORTANT NOTICE...................................................................................................................................................................................... 19
J. PIPING DIAGRAMS ........................................................................................................................................................................................ 20
4
WHL-001 REV. 9.3.14