Air For Combustion And Ventilation - Carrier 140/E Series Installation, Start-Up, Operating And Service And Maintenance Instructions
Variable speed induced-combustion deluxe 4-way multipoise furnace
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Table 2 – Minimum Free Area Required for Each Combustion Air opening of Duct to Outdoors
TWO HORIZONTAL DUCTS
FURNACE
(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW)
INPUT
Free Area of Opening
(BTUH)
and Duct
Sq. In. (Sq. mm)
44,000
22 (14194)
66,000
33 (21290)
88,000
44 (28387)
110,000
55 (35484)
132,000
66 (42580)
154,000
77 (49677)
FURNACE
WATER HEATER
110,000
+
30,000
66,000
+
40,000
88,000
+
30,000
Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
30
ACH
1,050
0.60
(29.7)
1,260
0.50
(35.6)
1,575
0.40
(44.5)
2,100
0.30
(59.4)
3,150
0.20
(89.1)
6,300
0.10
(178.3)
0.00
NP
NP = Not Permitted
AIR FOR COMBUSTION AND
VENTILATION
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
S
U.S. Installations: Section 9.3 of the NFPA 54/ANSI
Z223.1- -2006 , Air for Combustion and Ventilation and
applicable provisions of the local building codes.
S
Canadian Installations: Part 8 of the CAN/CSA- -
B149.1- -05, Venting Systems and Air Supply for Ap-
pliances and all authorities having jurisdiction.
CAUTION
!
FURNACE CORROSION HAZARD
Failure to follow this caution may result in furnace damage.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.
(1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW)
Round Duct
Free Area of Opening
Dia.
In. (mm)
Sq. In. (Sq. mm)
6 (152)
7 (178)
8 (203)
9 (229)
10 (254)
10 (254)
EXAMPLES: Determining Free Area
TOTAL INPUT
=
(140,000 divided by 4,000)
=
(106,000 divided by 3,000)
=
(118,000 divided by 2,000)
40
50
1,400
1,750
1,100
(39.6)
(49.5)
(31.1)
1,680
2,100
1,320
(47.5)
(59.4)
(37.3)
2,100
2,625
1,650
(59.4)
(74.3)
(46.7)
2,800
3,500
2,200
(79.2)
(99.1)
(62.2)
4,200
3,300
5,250 (148.6)
(118.9)
(93.4)
8,400
10,500
6,600
(237.8)
(297.3)
(186.8)
NP
NP
SINGLE DUCT OR OPENING
Round Duct
and Duct
Dia.
In. (mm)
14.7 (9484)
5 (127)
22 (14193)
6 (152)
29.3 (18903)
7 (178)
36.7 (23677)
7 (178)
44 (28387)
8 (203)
51.3 (33096)
9 (229)
=
35.0 Sq. In. for each two Vertical Ducts or Openings
=
35.3 Sq. In. for a Single Duct or Opening
=
59.0 Sq. In. for each of two Horizontal Ducts
FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
44
66
88
3
3
Space Volume Ft
(M
)
1,650
2,200
(46.7)
(62.2)
1,980
2,640
(56.0)
(74.7)
2,475
3,300
(70.0)
(93.4)
3,300
4,400
(93.4)
(124.5)
4,950
6,600
(140.1)
(186.8)
9,900
13,200
(280.3)
(373.7)
NP
NP
NP
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
The operation of exhaust fans, kitchen ventilation fans,
clothes dryers, attic exhaust fans or fireplaces could create a
NEGATIVE PRESSURE CONDITION at the furnace.
Make- -up air MUST be provided for the ventilation devices,
in addition to that required by the furnace. Refer to the
Carbon Monoxide Poisoning Hazard warning in the venting
section of these instructions to determine if an adequate
amount of make- -up air is available.
The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume
of at least 50 cubic feet per 1,000 Btuh input rating for all gas
appliances installed in the space.
S
Spaces having less than 50 cubic feet per 1,000 Btuh
require the OUTDOOR COMBUSTION AIR
METHOD.
8
TWO OPENINGS OR VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)
Free Area of Opening
Round Duct
and Duct
Sq. In. (Sq. mm)
11 (7096)
16.5 (10645)
22 (14193)
27.5 (17742)
33 (21290)
38.5 (24839)
110
132
2,750
3,300
(77.8)
(93.4)
3,300
3,960
(93.4)
(112.1)
4,125
4,950
(116.8)
(140.1)
5,500
6,600
(155.7)
(186.8)
8,250
9,900
(233.6)
(280.3)
16,500
19,800
(467.2)
(560.6)
NP
NP
WARNING
Dia.
In. (mm)
4 (102)
5 (127)
6 (152)
6 (152)
7 (178)
8 (203)
154
3,850
(109.0)
4,620
(130.8)
5,775
(163.5)
7,700
(218.0)
11,550
(327.0)
23,100
(654.1)
NP
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