Carrier 58SU0A Series Installation, Start-Up, Operating And Service And Maintenance Instructions page 6

Fig. 5 - - Installation in a Garage
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
When the furnace is installed in a residential garage, the
burners and ignition sources must be located at least 18
inches above the floor. (See Fig. 5) The furnace must be
located or protected to avoid damage by vehicles. When the
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, the furnace
must be installed in accordance with the NFGC.
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)
* 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
18-IN. (457.2 mm)
MINIMUM TO BURNERS
(1,100 SQ. MM/KW)
Round Duct
In. (mm)
Dia
5 (127)
6 (152)
7 (178)
8 (203)
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
!
PERSONAL
DAMAGE
Improper use or installation of this furnace may cause
premature furnace component failure.
This furnace is not permitted to be used for heating of
buildings under construction.
A93044
SINGLE DUCT OR OPENING
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
Round
Duct
Free Area of Open-
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)
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
6
CAUTION
INJURY AND/OR
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)
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
PROPERTY
Round Duct
In. (mm) Dia.
4 (102)
5 (127)
5 (127)
6 (152)
132
3,300
3,960
4,950
6,600
9,900
19,800
NP