Installation; Upflow Installation - Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions

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
NP = Not Permitted
Table 3- -Minimum Space Volumes were determined by using
the following equations from the National Fuel Gas Code ANSI
Z223.1- -2006/NFPA 54- -2006, 9.3.2.2:
1. For other than fan- -assisted appliances, such as a draft
hood- -equipped water heater:
= 21ft
Volume
ACH
Other
2. For fan- -assisted applicances such as this furnace:
= 15ft
Volume
ACH
Fan
If:
I = combined input of all other than fan- -assisted
other
appliances in Btuh/hr
= combined input of all fan- -assisted appliances in
I
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 closable doors between rooms.
b. Combining spaces on same floor level. Each opening
shall have free area of at least 1 in.2/1,000 Btuh (2,000
mm2/kW) of the total input rating of all gas appliances
in the space, but not less than 100 in.2 (0.06 m2). One
opening shall commence within 12 in. (300 mm) of the
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 Fig.
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.2/1,000 Btuh (4,400 mm2/kW) of total
input rating of all gas appliances.
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,
infiltration should be adequate to provide air for
combustion, permanent ventilation and dilution of flue
gases. However, in buildings with unusually tight
40 50
Space Volume (ft 3)
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 NP
I
3
other
1000 Btu/hr
A04002
I
3
fan
1000 Btu/hr
A04003
FAN---ASSISTED TOTAL
(1,000s BTUH GAS INPUT RATE)
44 66 88
1,100 1,650 2,200
1,320 1,980 2,640
1,650 2,475 3,300
2,200 3,300 4,400
3,300 4,950 6,600
6,600 9,900 13,200
NP NP NP
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
wall panels, at penetrations for plumbing, electrical and
gas lines, etc.
Combination of Indoor and Outdoor Air
1. Indoor openings
Combustion Air Method below and,
2. Outdoor openings shall be located as required in the
Outdoor Combustion Air Method mentioned previously
and,
3. Outdoor openings shall be sized as follows:
a. Calculate the Ratio of all Indoor Space volume divided
by required volume for Indoor Combustion Air
Method below.
b. Outdoor opening size reduction Factor is 1 minus the
Ratio in a. above.
c. Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
multiplied by reduction Factor in b. above. The
minimum dimension of air openings shall be not less than
3 in. (80 mm).

INSTALLATION

UPFLOW INSTALLATION

Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom
filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. This panel MUST be in place when
only side return air is used.
NOTE: Side return- -air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return- -air
openings in DOWNFLOW configuration.
10
110 132 154
2,750 3,300 3,850
3,300 3,960 4,620
4,125 4,950 5,775
5,500 6,600 7,700
8,250 9,900 11,550
16,500 19,800 23,100
NP NP NP
shall compy with the Indoor