Air For Combustion And Ventilation - Carrier F80CSU Installation, Start-Up, Operating And Service And Maintenance Instructions

F80CSU and G80CSU: Installation, Start–Up, Operating and Service and Maintenance Instructions
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.
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 NFGC
NFPA54/ANSI Z223.1, Air for Combustion and Ventilation, and
applicable provisions of the local building codes.
WARNING
!
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.
• Spaces having less than 50 cubic feet per 1,000 Btuh require the
OUTDOOR COMBUSTION AIR METHOD.
• Spaces having at least 50 cubic feet per 1,000 Btuh may use the
INDOOR COMBUSTION AIR, STANDARD or KNOWN AIR
INFILTRATION METHOD.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion,
ventilation, and dilution of flue gases using permanent horizontal or
vertical duct(s) or opening(s) directly communicating with the
outdoors or spaces that freely communicate with the outdoors.
12 " MAX
(305mm)
A02054
1 SQ IN.
PER 2000
BTUH*
DUCTS
TO
OUTDOORS
1 SQ IN.
PER 2000
BTUH*
12 " MAX
(305mm)
CIRCULATING AIR DUCTS
*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
2. Fig. 7 illustrates how to provide TWO OUTDOOR OPENINGS,
one inlet and one outlet combustion and ventilation air opening, to
the outdoors.
a. One opening MUST commence within 12-in. (300 mm) of the
ceiling and the second opening MUST commence within 12-in.
(300 mm) of the floor.
b. Size openings and ducts per
c. TWO HORIZONTAL DUCTS require 1 square inch of free area
per 2,000 Btuh (1,100 mm
appliances in the space per
d. TWO OPENINGS OR VERTICAL DUCTS require 1 square
inch of free area per 4,000 Btuh (550 mm
input of all gas appliances in the space per
3. ONE OUTDOOR OPENING requires:
a. 1 square inch of free area per 3,000 Btuh (734 mm
combined input of all gas appliances in the space per
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
– 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.
6
1 SQ IN.
PER 4000
DUCTS
BTUH*
TO
OUTDOORS
12 "
D
MAX
VENT
B
THROUGH
F
ROOF
1 SQ IN.
PER
4000
BTUH*
1 SQ IN.
PER
4000
BTUH*
E
G
A
12 "
MAX
C
12 " MAX
(305mm)
DUCT
1 SQ IN.
TO
PER 4000
OUTDOORS
BTUH*
Outdoors
Fig. 7 and Table 2.
2
/kW) of combined input for all gas
Fig. 7 and Table 2.
2
/kW) for combined
Fig. 7
©
NFPA & AGA
(305mm)
(305mm)
A03174
and Table 2.
2
/kW) for
Table 2 and