5
TABLE OF CONTENTS
PART 1 – GENERAL SAFETY INFORMATION
.......................................................................................... 7
A. PRECAUTIONS .................................................................................................................................... 7
B. IMPROPER COMBUSTION ................................................................................................................. 8
C. GAS ...................................................................................................................................................... 8
D. WHEN SERVICING THE HEATER ...................................................................................................... 8
E. WATER QUALITY ................................................................................................................................ 8
F. WINTERIZING ...................................................................................................................................... 9
PART 2 – BEFORE YOU START
................................................................................................................ 9
A. WHAT’S IN THE BOX ........................................................................................................................... 9
B. HOW THE HEATER OPERATES ........................................................................................................ 9
C. OPTIONAL EQUIPMENT ................................................................................................................... 11
PART 3 – DIMENSIONS AND CLEARANCES
.......................................................................................... 12
PART 4 – PREPARE HEATER LOCATION
.............................................................................................. 13
A. BEFORE LOCATING THE HEATER .................................................................................................. 13
B. LEVELING .......................................................................................................................................... 14
C. CLEARANCES FOR SERVICE ACCESS .......................................................................................... 14
D. RESIDENTIAL GARAGE INSTALLATION ......................................................................................... 14
E. EXHAUST VENT AND INTAKE AIR VENT ........................................................................................ 14
1. DIRECT VENT INSTALLATION OF EXHAUST AND INTAKE ....................................................... 15
2. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED SPACE ......... 15
F. PREVENT COMBUSTION AIR CONTAMINATION ........................................................................... 16
G. REMOVING A HEATER FROM A COMMON VENT SYSTEM ......................................................... 16
PART 5 – PREPARE THE HEATER
.......................................................................................................... 17
PART 6 – HEATER PIPING
....................................................................................................................... 18
A. GENERAL PIPING INFORMATION ................................................................................................... 18
B. RELIEF VALVE ................................................................................................................................... 18
C. BACKFLOW PREVENTER ................................................................................................................ 19
D. SYSTEM WATER PIPING METHODS .............................................................................................. 19
E. CIRCULATOR PUMPS ....................................................................................................................... 19
F. INDIRECT FIRED WATER HEATER SCALDING .............................................................................. 20
G. HYDRONIC PIPING - CIRCULATORS, ZONE VALVES AND MULTIPLE HEATERS ..................... 20
H. FILL AND PURGE HEATING SYSTEM ............................................................................................. 21
I. ZONING WITH ZONE VALVES ........................................................................................................... 22
J. ZONING WITH CIRCULATORS ......................................................................................................... 22
Summary of Contents for PHR100-55
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