5
F. PREVENT COMBUSTION AIR CONTAMINATION ........................................................................................................... 17
G. REMOVING A BOILER FROM A COMMON VENT SYSTEM .......................................................................................... 18
H. UNCRATING THE BOILER ............................................................................................................................................... 18
PART 4
– BOILER PIPING ...................................................................................................................................... 19
A. GENERAL PIPING INFORMATION .................................................................................................................................. 19
B. RELIEF VALVE ................................................................................................................................................................. 20
C. BACKFLOW PREVENTER ............................................................................................................................................... 20
D. SYSTEM WATER PIPING METHODS .............................................................................................................................. 20
E. CIRCULATORS ................................................................................................................................................................. 21
F. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE BOILERS .............................................. 22
G. PIPING DETAILS* ............................................................................................................................................................. 22
H. PIPING INSTALLATION .................................................................................................................................................... 27
I. CIRCULATOR SIZING ........................................................................................................................................................ 28
J. CHECK/CONTROL WATER CHEMISTRY ........................................................................................................................ 29
K. FILL AND PURGE HEATING SYSTEM ............................................................................................................................ 31
L. GLYCOL ANTIFREEZE SOLUTIONS ............................................................................................................................... 31
M. ZONING WITH ZONE VALVES ........................................................................................................................................ 32
N. ZONING WITH CIRCULATORS........................................................................................................................................ 32
O. MULTIPLE BOILERS ........................................................................................................................................................ 32
PART 5
– VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL ........................................................ 33
A. GENERAL ......................................................................................................................................................................... 33
B. APPROVED MATERIALS FOR EXHAUST AND INTAKE AIR VENTS ............................................................................. 34
C. REQUIREMENTS FOR INSTALLATION IN CANADA ...................................................................................................... 35
D. EXHAUST VENT AND INTAKE AIR VENT PIPE LOCATION .......................................................................................... 36
E. EXHAUST VENT AND INTAKE AIR VENT SIZING .......................................................................................................... 39
F. LONGER VENT RUNS ...................................................................................................................................................... 40
G. EXHAUST VENT AND INTAKE AIR PIPE INSTALLATION .............................................................................................. 40
H. SIDEWALL VENTING ....................................................................................................................................................... 42
I. VERTICAL VENTING ......................................................................................................................................................... 43
J. HORIZONTAL VENTING ................................................................................................................................................... 44
K. UNBALANCED FLUE / VERTICAL VENT ......................................................................................................................... 45
L. VENTING THROUGH AN EXISTING SYSTEM................................................................................................................. 46
1. CONCENTRIC VENTING THROUGH AN EXISTING SYSTEM ......................................................................................................... 46
2. VENTING AS A CHASE ..................................................................................................................................................................... 48
M. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED SPACE............................................. 49
PART 6
– GAS PIPING ............................................................................................................................................ 51
A. GAS CONNECTION .......................................................................................................................................................... 51
B. GAS PIPING ...................................................................................................................................................................... 51
Summary of Contents for EL-110
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