Tempstar F8MTL Installation Instructions Manual page 9

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death
and/or personal injury.
Many homes require air to be supplied from outdoors
for furnace combustion, ventilation, and dilution of flue
gases. The furnace combustion air supply must be
provided in accordance with this instruction manual.
The Standard Method:
1. The space has no less volume than 50 cubic feet per
1,000 Btuh of the maximum input ratings for all gas
appliances installed in the space and
Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN−ASSISTED TOTAL
(1,000s BTUH GAS INPUT RATE)
ACH
30
0.60 1,050
0.50 1,260
0.40 1,575
0.30 2,100
0.20 3,150
0.10 6,300
0.00 NP
ACH = Air Changes/Hour
NP = Not Permitted
Table 3−Minimum Space Volumes were determined by
using the following equations from the National Fuel Gas
Code ANSI Z223.1−2012/NFPA 54−2012, 9.3.2.2:
1. For other than fan−assisted appliances, such as a
draft hood−equipped water heater:
= 21ft
Volume
Other
2. For fan−assisted appliances such as this furnace:
= 15ft
Volume
Fan
If:
I = combined input of all other than fan−assisted
other
appliances in Btuh/hr
I = combined input of all fan−assisted appliances in
fan
Btuh/hr
ACH = air changes per hour (ACH shall not exceed 0.60.)
The following requirements apply to the Standard Method
and to the Known Air Infiltration Rate Method.
1. Adjoining rooms can be considered part of a space if:
a. There are no closeable doors between rooms.
b. Combining spaces on same floor level. Each opening
shall have free area of at least 1 in.
2
mm /kW) of the total input rating of all gas appliances
in the space, but not less than 100 in.
opening shall commence within 12 in. (300 mm) of the
441 01 2101 05
40
1,400 1,750
1,680 2,100
2,100 2,625
2,800 3,500
4,200 5,250
8,400 10,500
NP
I
3
other
ACH 1000 Btu/hr
I
3
fan
ACH 1000 Btu/hr
2
/1,000 Btuh (2,000
2
(0.06 m
Specifications are subject to change without notice.
2. The air infiltration rate is not known to be less than 0.40
air changes per hour (ACH).
The Known Air Infiltration Rate Method shall be used, if the
infiltration rate is known to be:
1. Less than 0.40 ACH and
2. Equal to or greater than 0.10 ACH
Infiltration rates greater than 0.60 ACH shall not be used. The
minimum required volume of the space varies with the
number of ACH and shall be determined per Table 3 or
Equations 1 and 2. Determine the minimum required volume
for each appliance in the space and add the volumes
together to get the total minimum required volume for the
space.
50 44 66
Space Volume (ft.3)
1,100 1,650
1,320 1,980
1,650 2,475
2,200 3,300
3,300 4,950
6,600 9,900
NP NP NP
ceiling and the second opening shall commence
within 12 in. (300 mm) of the floor. The minimum
dimension of air openings shall be at least 3 in. (80
mm). (See Figure 8)
c. Combining space on different floor levels. The
volumes of spaces on different floor levels shall be
considered as communicating spaces if connected by
one or more permanent openings in doors or floors
having free area of at least 2 in.
mm
A04002 2. An attic or crawlspace may be considered a space that
freely communicates with the outdoors provided there
are adequate permanent ventilation openings directly
to outdoors having free area of at least 1−in.2/4,000
Btuh of total input rating for all gas appliances in the
space.
3. In spaces that use the Indoor Combustion Air Method,
A04003
infiltration should be adequate to provide air for
combustion, permanent ventilation and dilution of flue
gases. However, in buildings with unusually tight
construction, additional air MUST be provided using
the methods described in the Outdoor Combustion Air
Method section. Unusually tight construction is defined
as Construction with:
a. Walls and ceilings exposed to the outdoors have a
continuous, sealed vapor barrier. Openings are
gasketed or sealed and
b. Doors and openable windows are weatherstripped
and
c. Other openings are caulked or sealed. These include
joints around window and door frames, between sole
plates and floors, between wall−ceiling joints, between
2
). One
wall panels, at penetrations for plumbing, electrical
and gas lines, etc.
FAN−ASSISTED TOTAL
(1,000s BTUH GAS INPUT RATE)
88 110
2,200 2,750
2,640 3,300
3,300 4,125
4,400 5,500
6,600 8,250
13,200 16,500
NP NP
2
/kW) of total input rating of all gas appliances.
132 154
3,300 3,850
3,960 4,620
4,950 5,775
6,600 7,700
9,900 11,550
19,800 23,100
NP NP
2
/1,000 Btuh (4,400
9