Air For Combustion And Ventilation - Carrier 58SU0A Installation, Start-Up, Operating And Service And Maintenance Instructions

Table 2 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors
TWO HORIZONTAL DUCTS
(1 SQ. IN./2,000 BTUH)
FURNACE
Free Area of Open­
INPUT
ing and Duct
(BTUH)*
Sq. In (Sq. mm)
40,000
20 (12904)
60,000
30 (19355)
80,000
40 (25807)
100,000
50 (32258)
120,000
60 (38709)
* Not all input sizes are available.
EXAMPLE: Determining Free Area
FURNACE WATER HEATER
100,000 + 30,000
60,000 + 40,000
80,000 + 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
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
*Air Changes/Hour
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return−air ducts to the back of the furnace. (See Fig. 6)
Fig. 6 − Prohibit Installation on Back
(1,100 SQ. MM/KW)
Round Duct
In. (mm)
Dia
5 (127)
6 (152)
7 (178)
8 (203)
9 (229)
TOTAL INPUT
= (130,000 divided by 4,000)
= (100,000 divided by 3,000)
= (110,000 divided by 2,000)
40 50
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
SINGLE DUCT OR OPENING
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
Round
Free Area of Open­ Duct
In. (mm)
ing and Duct
Sq. In (Sq. mm)
14 (8696) 5 (127)
20 (13043) 5 (127)
27 (17391) 6 (152)
34 (21739) 7 (178)
40 (26087) 7 (178)
32.5 Sq. In. for each two Vertical Ducts or
=
Openings
= 33.3 Sq. In. for each Single Duct or Opening
= 55.0 Sq. In. for each two Horizontal Ducts
(1,000'S BTUH GAS INPUT RATE)
44 66
3
Space Volume (ft. )
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
!
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.
LOCATION RELATIVE TO COOLING EQUIPMENT
The cooling coil must be installed parallel with, or on the
downstream side of the unit to avoid condensation in the heat
exchangers. When installed parallel with the furnace, dampers or
other flow control must prevent chilled air from entering the
furnace. If the dampers are manually operated, they must be
equipped with means to prevent operation of either unit unless
the damper is in the full−heat or full−cool position.
AIR FOR COMBUSTION AND
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
S
U.S. installations: Section 9.3 of the current edition of
A02054
NFGC NFPA54/ANSI Z223.1, Air for Combustion
and Ventilation, and applicable provisions of the local
building codes.
7
TWO OPENINGS OR
VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
Free Area of Opening
and Duct
Dia
Sq. In (mm)
10 (6452)
15 (9678)
20 (12904)
25 (16130)
30 (19355)
FAN-ASSISTED TOTAL
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
CAUTION
VENTILATION
Round Duct
In. (mm) Dia.
4 (102)
5 (127)
5 (127)
6 (152)
6 (152)
132
3,300
3,960
4,950
6,600
9,900
19,800
NP