Installation; Air For Combustion And Ventilation; General; Unconfined Space - Carrier 110 Series Installation, Start-Up, And Operating Instructions Manual

UNIT APPLICATION
Furnace
Sides
Supply Plenum and Warm-Air Duct Within 6 ft
of Furnace
Back Service Clearance
Furnace Casing or Plenum
Top
Horizontal Warm-Air Duct Within 6 ft of
Furnace
Bottom
Horizontally or Below Pipe
Flue
Pipe
Vertically Above Pipe
Front
* For combustible floor, use approved subbase.
NOTE: Adequate service clearances should be provided over and above these dimensions as required.

INSTALLATION

Step 1—Air for Combustion and Ventilation
CARBON MONOXIDE POISONING AND UNIT
CORROSION HAZARD
Failure to follow this warning could lead to premature rusting
of heat exchanger and possible premature furnace failure
and/or vent failure which could result in fire hazard and/or
personal injury or death.
Installation of this furnace in an area where it will receive
contaminated combustion air must be avoided. Such contami-
nation would include the following: ammonia, chlorine,
hydrogen sulfide, halogenated hydrocarbons, carbon tetra-
chloride, cleaning solvents, hydrochloric acid, water soften-
ing chemicals, and similar chemicals.
CARBON MONOXIDE POISONING AND FIRE
HAZARD
Failure to follow this warning could result in property
damage, personal injury or death.
Do not block combustion-air openings in the furnace. Any
blockage could result in improper combustion.
Step 2—General
This furnace should be installed in a location in which facilities for
ventilation permit satisfactory combustion of oil, proper venting,
and maintenance of ambient temperature at safe limits under
normal conditions of use. The location should not interfere with
proper circulation of air within the confined space. (See NFPA-31,
Section 1.5.)
In addition to air needed for combustion, process air shall be
provided as required for: cooling of equipment or material,
controlling dew point, heating, drying, oxidation or dilution, safety
exhaust, and odor control.
In addition to air needed for combustion, air shall be supplied for
ventilation, including all air required for comfort and proper
working conditions for personnel.
The barometric draft regulator (included with furnace) shall be
installed in same room or enclosure as furnace in such a manner as
to prevent any difference in pressure between regulator and
combustion-air supply.
Air requirements for operation of exhaust fans, kitchen ventilation
systems, clothes dryers, and fireplaces shall be considered in
determining the adequacy of a space to provide combustion-air
requirements.
Table 1—Minimum Clearances to Combustible Materials (In.)
UPFLOW DOWNFLOW
0
1
0
2
2
0
4
9
8
The lack of a proper amount of combustion air can lead to serious
furnace operational problems. Some of these problems are:
1. Excessive oil burner after-drip, and oil fumes.
2. Sooting.
3. Melted oil burner ignitor/relay control.
4. Air band or air turbulator settings open more than normal.
5. Lockouts on start-up. The requirements for combustion and
ventilation air depend upon whether furnace is located in a
CONFINED or UNCONFINED space.
Step 3—Unconfined Space
An unconfined space must have at least 50 cu ft for each 1000
Btuh of total input for all the appliances (such as furnaces, clothes
dryers, water heaters, etc.) in the space.
In unconfined spaces in buildings of conventional frame, brick, or
stone construction, infiltration MAY be adequate to provide air for
combustion, ventilation, and dilution of flue gases. This determi-
nation must be made on an individual installation basis and must
take into consideration the overall volume of unconfined space, the
number of windows and ventilation openings, the number of doors
to the outside, internal doors which can close off unconfined space,
and overall tightness of building construction. Consideration must
also be given to the amount of storage items (furniture, boxes, etc.)
within the unconfined space which take away from the air volume.
(Refer to Table 2.)
Table 2—Minimum Floor Area for Unconfined
58VMR FURNACE
INPUT BTUH
70,000
91,000
105,000
119,000
140,000
154,000
Many new buildings and homes (and older ones that have been
weatherized) MUST BE considered as being of tight construction,
therefore, infiltration will not be sufficient to supply necessary air
for combustion and ventilation.
A building can be considered as being of tight construction when:
1. Walls and ceilings exposed to outside atmosphere have a
continuous water vapor retarder with a rating of 1 perm or less
with openings gasketed or sealed, and/or
4
HORIZONTAL
2 2
2 1
1 4
2 2
2 3
0* 0
4 4
9 9
8 8
Space
MINIMUM SQ FT WITH
7-1/2 FT CEILING
467
607
700
793
933
1026