Air For Combustion And Ventilation - Carrier Minor 2 Series Installation, Start-Up, Operating And Service And Maintenance Instructions

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)
(1,100 SQ. MM/KW)
FURNACE INPUT
(BTUH)
Free Area of
Opening and Duct
Sq. In (Sq. mm)
20 (12904)
40,000
30 (19355)
60,000
80,000 40 (25807)
100,000 50 (32258)
EXAMPLE: Determining Free Area
FURNACE WATER HEATER
100,000 + 30,000
+ 40,000
60,000
+ 30,000
80,000
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
1,575
0.40
2,100
0.30
3,150
0.20
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
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
SINGLE DUCT OR OPENING
Free Area of
Round Duct
Opening and Duct
In. (mm) Dia
Sq. In (Sq. mm)
5 (127) 14 (8696)
6 (152) 20 (13043)
7 (178) 27 (17391)
8 (203) 34 (21739)
TOTAL INPUT
= (130,000 divided by 4,000)
= (100,000 divided by 3,000)
= (110,000 divided by 2,000)
40 50
Space Volume (ft.3)
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
A02054
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
Round Duct
In. (mm) Dia
5 (127)
5 (127)
6 (152)
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
FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
40 60
1,000 1,500
1,200 1,800
1,500 2,250
2,000 3,000
3,000 4,500
6,000 9,000
NP NP
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 VENTILATION

Provisions for adequate combustion, ventilation, and dilution air must be
provided in accordance with:
• U.S. installations: Section 9.3 of the current edition of
NFPA54/ANSI Z223.1, Air for Combustion and Ventilation, and
applicable provisions of the local building codes.
!
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
Carbon Monoxide Poisoning Hazard warning in 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.
6
TWO OPENINGS OR
VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
Free Area of
Round Duct
Opening and Duct
In. (mm) Dia.
Sq. In (mm)
10 (6452) 4 (102)
15 (9678) 5 (127)
20 (12904) 5 (127)
25 (16130) 6 (152)
80
2,000
2,400
3,000
4,000
6,000
12,000
NP
WARNING
100
3,300
3,960
4,950
6,600
9,900
19,800
NP
NFGC