A.O. Smith BTX-80 SERIES 100 Water Heater User Manual


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20
TERMINATION CLEARANCES SIDEWALL POWER VENT
V X
VENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
v
v
A
G
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
C
B
B
B
B
F
B
V
V
A
J
V
H
M
X
X
V
V
K
B
E
D
L
POWER VENT
(using room air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
FIGURE 15.
Vent terminal clearances for “Power Vent” installations. Power Vent congurations use room air for combustion.
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
A
Clearance above grade,
veranda, porch, deck or
balcony
12inches(30cm) 12inches(30cm)
H
Clearance to each side
of center line extended
above meter/regulator
assembly
3feet(91cm)withinaheight15feet
(4.5m)abovethemeter/
regulator assembly
3feet(91cm)withina
height15feet(4.5m)
above the meter/regulator
assembly*
B
Clearance to window
or door that may be
opened
6inches(15cm)forappliancesupto
10,000Btu/hr(3kW),12inches(30
cm)forappliancesbetween10,000
Btu/hr(3kW)and100,000Btu/hr(30
kW),36inches(91cm)forappliances
above100,000Btu/hr(30kW)
4feet(1.2m)below
or to side of opening;
1foot(30cm)above
opening
I
Clearance to service
regulator vent outlet
3feet(91cm) 3feet(91cm)*
C
Clearance to
permanently closed
window
12inches(30cm)* 12inches(30cm)*
J
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
6inches(15cm)forappliancesup
to10,000Btu/hr(3kW),12inches
(30cm)forappliancesbetween
10,000Btu/hr(3kW)and100,000
Btu/hr(30kW),36inches(91cm)
for appliances above 100,000 Btu/
hr(30kW)
4feet(1.2m)beloworto
side of opening; 1 foot
(30cm)aboveopening.
D
Vertical clearance to
ventilatedsoftlocated
above the terminal
within a horizontal
distanceof2feet(61
cm)fromthecenterline
of the terminal
12inches(30cm)* 12inches(30cm)*
K
Clearance to a
mechanical air supply
inlet
6feet(1.83m)
3feet(91cm)aboveif
within
10feet(3m)horizontally
E
Clearance to
unventilatedsoft
12inches(30cm)* 12inches(30cm)*
L
Clearance above paved
sidewalk or paved
driveway located on
public property
7feet(2.13m)† 7feet(2.13m)†
F
Clearance to outside
corner
2feet(60cm)* 2feet(60cm)*
M
Clearance under
veranda, porch, deck, or
balcony
12inches(30cm)‡ 12inches(30cm)‡
G
Clearance to inside
corner
18inches(45cm)* 18inches(45cm)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
†Aventshallnotterminatedirectlyaboveasidewalkorpaveddrivewaythatislocatedbetweentwosinglefamilydwellingsandservesbothdwellings.
‡Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththeoor.
*Clearanceinaccordancewithlocalinstallationcodesandtherequirementsofthegassupplierandthemanufacturer’sinstallationinstructions.
VENT PIPE TERMINATION
Therststepistodeterminewheretheventpipewillterminate.See
Figures 15, 20 and 21. The vent may terminate through a sidewall as
shown in Figure 20 or through the roof as shown in Figure 21.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
NationalFuelGasCode,(ANSIZ223.1,12.9.1through12.9.4)orthe
NaturalGasandPropaneInstallationCode(CAN/CSA-B149.1).
Instructions on proper installation through a sidewall are provided
in Figure 15.
Plan the vent system layout so that proper clearances are maintained
from plumbing and wiring.
Ventpipesservingpowerventedappliancesareclassiedbybuilding
codesas“ventconnectors”.Requiredclearancesfromcombustible
materials must be provided in accordance with information in
this manual under LOCATING THE NEW WATER HEATER and
INSTALLING THE WATER HEATER, and with the National Fuel
Gas Code and local codes.
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