11
VENTING INSTRUCTIONS
For indoor models
-General-
WARNING
• Improper ven
ting
of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or death.
• Improper installa
tion
can cause nausea or asphyxia
tion,
severe injury or death
from carbon monoxide and
flue
g
ases
poisoning.
Improper installa
tion
will void
product warranty.
CAUTION
applicable na
tional
and local codes.
When installin
g
the vent syst
em,
all applicable na
tional
and local codes must be
followed. If you install
thimbles,
fi
re stops or other prot
ecti
ve devices and they
penetrate any combus
tible
or noncombus
tible
cons
truction,
be sure to follow all
The boiler must be vented in accordance with the
section
“Ven
ting
of Equipment" of the current
edition
of the Na
tional
Fuel Gas Code: ANSI Z223.1/NFPA
54,
as well as applicable local
building
codes.
The manufacturer recommends NovaVENT™ or Z-Vent® category III, single wall, stainless steel ven
ting.
See "Approved Cate
g
ory
III,
Single
W
all,
Stainless Steel Ven
ting
and Part Numbers" on
the next page.
General rules for air intake:
The boiler can obtain its combus
tion
air from the space that it is installed in or it can be direct
vented.
Direct ven
ting
installa
tion:
•
The air intake can use 3" PVC (solid cor
e),
CPVC (solid cor
e),
ABS,
or cate
g
ory III vent.
•
Use of cellular core PVC (ASTM
F891),
cellular core CPVC
,
or Radel® (polyphenylsulfone) in non-
metallic ven
ting
systems is prohibited. Cov
ering
non-metallic vent pipe and
fittings
with thermal
insula
tion
is prohibited.
•
Ensure that the installa
tion
loca
tion
has su
fficie
n
t,
clean combus
tion
air. If unsur
e,
direct vent the
boiler or refer to the Combus
tion
Air Supply
section
below.
Combus
tion
air from the room:
•
Install a 3" elbow into the air intake collar.
General rules for ven
ting
water heaters are:
•
The maximum len
g
th of intake air
piping
must not exceed 60
ft.
(18.3 m). Deduct 5
ft.
(1.5 m) for
each 90° elbow or 2.5
ft
(0.76 m) for each 45° elbow used in the ven
ting
system. Two 45° elbows
when connected to
g
ether are equivalent to one 90° elbow. Refer to the tables on p. 19.
•
When the horizontal air intake exceeds more then 5
ft.,
support the pipe every 3
ft.
with pipe
han
g
ers.
•
V
erti
cal air intake pipe must be supported with pipe han
g
ers. Ensure that the w
eig
ht of the pipe
is not carried by the water heater.
• Place the boiler as close as possible to the vent termina
tion.
• The vent collar of the boiler must be fastened directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the boiler’s vent collar.
• Do not cut or alter the shape of the vent collar of the unit.
• The vent must be easily removable from the top of the boiler for normal service and
inspection
of the unit and vent system.
• The boiler vent must not be connected to any other
g
as appliance or vent stack.
• Avoid
using
an oversized vent pipe or
using
extremely
long
runs of pipe.
• For roo
ft
op ven
ting,
a rain cap or other form of termina
tion
that prevents rain water from
ent
ering
into the boiler must be installed.
• Do not common vent or connect any vent from other appliances to the boiler vent.
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