U.S. Boiler Company ESC, Installation, Operating And Service Instructions

Page: 10 / 64

10
3. PROVIDE COMBUSTION AIR
INSUFFICIENT COMBUSTION AIR
SUPPLY may result in the production and
release of deadly carbon monoxide (CO) into the
home.
Provide combustion and ventilation air in
accordance with the section "Air for Combustion
and Ventilation," of the
National Fuel Gas Code
,
ANSI Z223.1/NFPA 54, or applicable provisions of
the local building codes.
Like all fuel-burning appliances, boilers need air to
operate reliably and safely.
1.
If equipping for direct vent (sealed
combustion), provide combustion air
according to
Appendix B2—Venting for
Direct Vent boilers
.
2.
If not equipping the ESC for direct vent,
provide combustion air from the boiler room
according to
Appendix A—Combustion Air.
4. CONNECT VENTING
IMPROPER VENTING may result in
property damage and the release of
deadly carbon monoxide (CO) into the home.
Observe all general venting guidelines provided in
Appendix B—Venting.
Additionally:
Follow all instructions in Appendix B-2 Direct Vent
or
B-3 Power Vent
.
1.
For the exhaust, attach special (Category
IV) gas vent to the fan outlet using a single
sheetmetal screw (Figure 4-a).
2.
Configure the air intake:
(1) To equip the ESC for outdoor
combustion air (direct vent), attach the
4-a
4-b
plastic or metal intake air pipe to the
inlet air duct.
(2) To equip the ESC for indoor combustion
air (power vent), attach the air intake
terminal to the boiler's inlet air duct with
a single sheetmetal screw (Figure 4-b).
3.
For horizontal venting, follow the instructions
in
Appendix B2

Direct Venting, Special
Instructions for Stainless Steel Venting

Horizontal Installations, Specifically,
(1) Cut a hole in the exterior wall, large
enough to fit the wall thimble. Hole
diameter for the ESC3-7 is 7", hole
diameter for the ESC8-9 is 8".
(2) Install wall thimble.