11
Combustion air must be free of acid
forming chemicals; such as sulphur,
fluorine and chlorine. These elements
are found in aerosol sprays,
detergents, bleaches, cleaning
solvents, air fresheners, paint and
varnish removers, refrigerants and
many other commercial and household
products. Vapors from these products
when burned in a gas flame form acid
compounds. The acid compounds
increase the dew point temperature of
the flue products and are highly
corrosive after they condense.
ALL FURNACE INSTALLATIONS
MUST COMPLY WITH THE
NATIONAL FUEL GAS CODE AND
LOCAL CODES TO PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR FOR THE
FURNACE. FAILURE TO DO SO CAN
CREATE HAZARDOUS CONDITIONS
RESULTING IN PROPERTY
DAMAGE, BODILY INJURY OR
DEATH FROM SMOKE, FIRE OR
CARBON MONOXIDE.
Combustion air requirements are
determined by whether the furnace is
in an open (unconfined) area or in a
confined space such as a closet or
small room.
EXAMPLE 1.
FURNACE LOCATED IN AN
UNCONFINED SPACE
Using indoor air for combustion.
An unconfined space must have at
least 50 cubic feet for each 1,000
BTUH of the total input for all
appliances in the space. Here are a
few examples of the room sizes
required for different inputs. The sizes
are based on 8 foot ceilings.
BTUH
Minimum Sq. Feet
Typical Room Size
Input
With 8' Ceiling
With 8' Ceiling
50,000
312
14
x24
or 18
x18
75,000
469
15
x31
or 20
x24
100,000
625
20
x31
or 25
x25
125,000
833
23
x34
or 26
x30
If the open space containing the
furnace is in a building with tight
construction (contemporary
construction), outside air may still be
required for the furnace to operate and
vent properly. Outside air openings
should be sized the same as for a
confined space.
FIGURE 7
AIR FROM ATTIC/CRAWL SPACE
EXAMPLE 2.
FURNACE LOCATED IN A
CONFINED SPACE
A confined space (any space smaller
than shown above as “unconfined”)
must have openings into the space
which are located in accordance with
the requirements set forth in the
following subsections A and B. Size the
openings by how they are connected to
the heated area or to the outside, and
by the input of all appliances in the
space.
If confined space is within a building
with tight construction, combustion air
must be taken from outdoors or area
freely communicating with the
outdoors.
A. USING INDOOR AIR FOR
COMBUSTION (See Figure 6)
IMPORTANT:
Air should not be taken
from a heated space with a fireplace,
exhaust fan or other device that may
produce a negative pressure.
If combustion air is taken from the
heated area, the openings must
each have at least 100 square
inches of free area. Each opening
must have at least one square inch
of free area for each 1,000 Btuh of
total input in the space. Here are
some examples of typical openings
required.
Btuh
Free Area
Input
Each Opening
100,000
100 Square Inches
150,000
150 Square Inches
B. USING OUTDOOR AIR FOR
COMBUSTION (See Figure 7)
IMPORTANT:
Never take
combustion air from an attic space
that is equipped with power
ventilation.
The confined space must
communicate with the outdoors
according to Methods 1 and 2. The
minimum air opening dimension
shall not be less than 3 inches.
When using ducts, they shall be of
the same cross-sectional area as
the free area of the openings to
which they connect.
WARNING
!
Содержание (-)GLL Series
Страница 29: ...29 FIGURE 23 COOLING HEAT PUMP OFF DELAY PROFILES ST A0827 01...
Страница 30: ...30 FIGURE 24 COOLING HEAT PUMP ON DELAY PROFILES ST A0828 01...
Страница 31: ...31 FIGURE 25 LOW HEAT OFF DELAY PROFILES ST A0829 01...
Страница 32: ...32 FIGURE 26 HIGH HEAT OFF DELAY PROFILES ST A0830 01...
Страница 37: ...37 FIGURE 32 FILTER RETAINING RODS SIDE RETURN FIGURE 33 DOWNFLOW FILTER INSTALLATION...
Страница 39: ...39 FIGURE 34 INTEGRATED FURNACE CONTROL IFC TROUBLESHOOTING GUIDE FOR UTEC 1095 101...
Страница 40: ...40...
Страница 41: ...41 FIGURE 35 FOR MODELS WITH UT ELECTRONIC CONTROLS 1095 101 INTEGRATED FURNACE CONTROL AND ECM BLOWER MOTOR...
Страница 42: ...42...
Страница 43: ...43...
Страница 44: ...44 CM 1105...