Payne PG9YAA036060 Installation Instructions Manual page 12

Other Than Fan- Assisted Total
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
Table 2 – Minimum Space Volume for 100% Combustion and Ventilation Air from Indoors (ft
NP = Not Permitted
NO TAG Minimum Space Volumes were determined by using
the following equations from the National Fuel Gas Code ANSI
Z223.1/NFPA 54- -2006, 9.3.2.2:
1. For appliances other than fan- -assisted appliances (such
as a draft hood- -equipped water heater), calculate using the
following equation:
²
Required Volume
other
2. For fan- -assisted appliances (such as this furnace), calcu-
late using the following equation:
²
Required Volume
fan
where:
I = all appliances other than fan- -assisted input in Btu
other
per hour
I = fan- -assisted appliance input in Btu per hour
fan
ACH = air change per hour (percent of volume of space
exchanged per hour, expressed as a decimal)
3. For purposes of this calculation, an infiltration rate greater
than 0.60 ACH shall not be used in the equations above.
The following requirements apply to the Standard Method and to
the Known Air Infiltration Rate Method.
S Adjoining rooms can be considered part of a space, if there are
no closeable doors between rooms.
S Combining spaces on the same story. Each opening shall have
a minimum free area of at least 1 in.
2
mm /kW) of the total input rating of all appliances in the space
2
but not less than 100 in. (0.06 m
commence within 12 in. (304.8 mm) of the top, and one
opening shall commence within 12 in. (304.8 mm) of the
bottom, of the enclosure. The minimum dimension of air
openings shall not be less than 3 in. (76.2 mm).
S Combining spaces in different stories. The volumes of spaces
on different stories shall be considered as communicating
spaces where such spaces are connected by one or more
openings in doors or floors having a total minimum free area of
2
2 in. /1,000 BTUH (4,400 mm
appliances.
S An attic or crawl space may be considered a space that freely
communicates with the outdoors provided there are adequate
ventilation openings directly to outdoors. Openings MUST
remain open and NOT have any means of being closed off.
(1,000 Btuh)
40
1,400
1,680
2,100
2,800
4,200
8,400
NP
(
)
I
3
other
21 ft
1000 Btu / hr
ACH
( )
I
3 fan
15 ft
ACH
1000 Btu / hr
2
/1,000 BTUH (2,200
2
). One opening shall
2
/kW) of total input rating of all
Fan- assisted Total (1,000's Btuh)
50 50
1,750 1,250
2,100 1,500
2,625 1,875
3,500 2,500
5,250 3,750
10,500 7,500
NP NP
Ventilation openings to outdoors MUST be at least 1 square
inch of free area per 4,000 BTUH (550 mm
rating for all gas appliances in the space.
S In spaces that use the Indoor Combustion Air Method,
infiltration should be adequate to provide air for combustion,
ventilation and dilution of flue gases. However, in buildings
with unusually tight construction, additional air MUST be
provided using the methods described in section titled Outdoor
Combustion Air Method:
S Unusually tight construction is defined as Construction with:
1. Walls and ceilings exposed to the outdoors have a continu-
ous, sealed vapor barrier. Openings are gasketed or sealed
and
2. Doors and openable windows are weather stripped and
3. 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.
Ventilation Air
Some provincial codes and local municipalities require
ventilation or make- -up air be brought into the conditioned space
as replacement air. Whichever method is used, the mixed return
air temperature across the heat exchanger MUST not fall below
60° so that flue gases will not condense excessively in the heat
exchanger. Excessive condensation will shorten the life of the
heat exchanger and possibly void your warranty.
Venting and Combustion Air Check
NOTE: If this installation replaces an existing furnace from a
commonly vented system, the original venting system may no
longer be sized to properly vent the attached appliances. An
improperly sized venting system may cause the formation of
condensate in the vent and the leakage or spillage of vent gases.
To make sure there is adequate combustion air for all appliances,
MAKE THE FOLLOWING CHECK.
Vent Pipe
Typical Gas
Water Heater
Fig. 6 - - Vent Check
12
75 100
1,875 2,500
2,250 3,000
2,813 3,750
3,750 5,000
5,625 7,500
11,250 15,000
NP NP
3
)
2
/kW) of total input
Draft Hood
Match
125
3,125
3,750
4,688
6,250
9,375
18,750
NP
A07688