Carrier PG8JEA Installation, Start-Up, Operating And Service And Maintenance Instructions page 9

DUCTS
TO
O UTDOORS
12 " MAX
(305mm)
1 SQ IN.
PER 2000 B
BTUH*
DUCT S
TO
OUTDOORS
1 SQ IN.
PER 2000
A
BTUH*
12 " MAX
(305mm)
CIRCULA TING AIR DUCT S
*Minimum dimensions of 3 in. (76 mm).
NOTE: Use any of the following combinations of openings:
A&B, C&D, D&E, F&G
Fig. 7 - - Air for Combustion, Ventilation, and Dilution from
Outdoors
g. TWO HORIZONTAL DUCTS require 1 square inch of
free area per 2,000 Btuh (1,100 mm
input for all gas appliances in the space per Fig. 7 and
Table 2.
h. TWO OPENINGS OR VERTICAL DUCTS require 1
square inch of free area per 4,000 Btuh (550 mm
for combined input of all gas appliances in the space per
Fig. 7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 square inch of free area per 3,000 Btuh (734 mm
for combined input of all gas appliances in the space per
Table 2 and
b. Not less than the sum of the areas of all vent connectors
in the space.
The opening shall commence within 12" (300 mm) of the ceiling.
Appliances in the space shall have clearances of at least 1" (25
mm) from the sides and back and 6" (150 mm) from the front.
The opening shall directly communicate with the outdoors or
shall communicate through a vertical or horizontal duct to the
outdoors or spaces (crawl or attic) that freely communicate with
the outdoors.
Indoor Combustion Air - - NFPA & AGA
Standard and Known- -Air- -Infiltration Rate Methods
Indoor air is permitted for combustion, ventilation, and dilution,
if the Standard or Known- -Air- -Infiltration Method is used.
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.
1 SQ IN.
PER 4000
BTUH*
12 "
D
(305mm)
MAX
VENT
THR OUGH
F
R OOF
1 SQ IN .
PER
4000
BTUH*
1 SQ IN .
PER
4000
BTUH*
E
G
12 "
(305mm)
MAX
C
12 " MAX
(305mm)
DUCT
1 SQ IN.
TO
PER 4000
OUTDOORS
BTUH*
A03174
2
/kW) of combined
2
2
CIRCULATING AIR
INTERIOR
HEATED
SPACE
CIRCULATING AIR DUCTS
*Minimum opening size is 100 in.
mm).
*Minimum of 3 in. (76 mm), when type ---B1 vent is used.
Fig. 8 - - Air for Combustion, Ventilation, and Dilution from
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
2. The air infiltration rate is not known to be less than 0.40
/kW)
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
/kW)
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.
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:
Volume
2. For fan- -assisted appliances such as this furnace:
Volume
If:
Iother = combined input of all other than fan- -assisted appliances
in Btuh/hr
9
VENT THROUGH ROOF
DUCTS
12" MAX
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
UNCONFINED
SPACE
6" MIN
(FRONT)
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
2
with minimum dimensions of 3 in. (76
Indoors
I
= 21ft
3
ACH 1000 Btu/hr
Other
I
= 15ft
3
ACH 1000 Btu/hr
Fan
(305mm)
(152mm)
Ü
12" MA X (305mm)
A03175
other
A04002
fan
A004003