Air For Combustion And Ventilation - Carrier N92ESN Installation, Start-Up, Operating And Service And Maintenance Instructions

N92ESN: Installation, Start-up, Operating and Service and Maintenance Instructions
CAUTION
!
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in nuisance limit switch
cycling and unit component damage.
When a 17-1/2-in. wide upflow N coil is used with a 0601714 furnace,
the N coil must either be raised using a transition piece at least 3-in. (76
mm) high or if a transition piece is not used, the refrigerant lines must
point to the front of the furnace casing.

AIR FOR COMBUSTION AND VENTILATION

Introduction
Direct Vent (2-pipe) Applications
When the furnace is installed as a direct vent (2-pipe) furnace, no special
provisions for air for combustion are required. However, other gas
appliances installed in the space with the furnace may require outside air
for combustion. Follow the guidelines below to ensure that other gas
appliances have sufficient air for combustion.
Non-Direct Vent (1-pipe) Applications
When the furnace is installed as a non-direct vent (1-pipe) furnace, it
will be necessary to ensure there is adequate air for combustion. Other
gas appliances installed with the furnace may also require air for
combustion and ventilation in addition to the amount of combustion air
and ventilation air required for the furnace. Follow the guidelines below
to ensure that the furnace and other gas appliances have sufficient air for
combustion.
Ventilated Combustion Air Applications
When the furnace is installed using the ventilated combustion air option,
the attic or crawlspace must freely communicate with the outdoor to
provide sufficient air for combustion. The combustion air pipe cannot be
terminated in attics or crawlspaces that use ventilation fans designed to
operate during the heating season. If ventilation fans are present in these
areas, the combustion air pipe must terminate outdoors as a Direct Vent/
2-Pipe system.
All air for combustion is piped directly to the furnace from a space that is
well ventilated with outdoor air (such as an attic, crawl space or
equipment closet) and the space is well isolated from the living space or
garage. In addition, other gas appliances installed in the space with the
furnace may require outside air for combustion. Follow the guidelines
below to ensure that the roof or crawlspace walls have sufficient free
area to provide sufficient air for combustion and ventilation for the
Table 3 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors
TWO HORIZONTAL DUCTS
FURNACE INPUT (1 SQ. IN./2,000 BTUH)
(BTUH)
20 (12904)
40,000*
60,000 30 (19355)
80,000 40 (25807)
50 (32258)
100,000
60 (38709)
120,000
EXAMPLES: Determining Free Area
FURNACE WATER HEATER
100,000 + 30,000
60,000 + 40,000
80,000 + 30,000
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
(1,100 SQ. MM/KW)
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)
furnaces. The guidelines below can be used to ensure that other gas
appliances have sufficient air for combustion.
Provisions for adequate combustion, ventilation, and dilution air must be
provided in accordance with:
• U.S.A. Installations: Section 9.3 of the current edition of NFPA
54/ANSI Z223.1, Air for Combustion and Ventilation and applicable
provisions of the local building codes.
• Canada: Part 8 of the current edition of CAN/CSA-B149.1, Venting
Systems and Air Supply for Appliances.
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.
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.
• Spaces having less than 50 cubic feet per 1,000 BTUh (4.8 cubic
meters per kW) require the Outdoor Combustion Air Method.
• Spaces having at least 50 cubic feet per 1,000 BTUh (4.8 cubic meters
per kW) may use the Indoor Combustion Air, Standard or Known Air
Infiltration Method.
SINGLE DUCT OR OPENING
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
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
8
CAUTION
!
WARNING
!
TWO OPENINGS OR
VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
10 (6452)
15 (9678)
20 (12904)
25 (16130)
30 (19355)
4 (102)
5 (127)
5 (127)
6 (152)
6 (152)