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4. When a single air grille is used, duct between grille and
furnace must be the same size as return opening in furnace.
CAUTION: Return-air grilles and warm air registers
must not be obstructed.
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WARNING: When supply ducts carry air circulated by
furnace to areas outside spaces containing furnace, return
air MUST also be handled by a duct sealed to furnace
casing and terminating outside space containing furnace.
Incorrect duct work termination and sealing will create a
negative pressure leading to a hazardous condition which
could cause bodily harm.
When installing furnace with cooling equipment for year-round
operation, the following recommendations must be followed for
series or parallel airflow:
1. In series airflow applications, coil is mounted after furnace
in an enclosure in supply-air stream. The furnace blower is
used for both heating and cooling airflow.
WARNING: The coil MUST be installed on air dis-
charge side of furnace. Under no circumstances should
airflow be such that cooled, conditioned air can pass over
furnace heat exchanger. This will cause condensation in
heat exchanger and possible failure of heat exchanger
which could lead to a fire hazard and/or a hazardous
condition which may lead to bodily harm. Heat exchanger
failure due to improper installation may not be covered by
warranty.
2. In parallel airflow applications, dampers must be provided
to direct air over furnace heat exchanger when heat is
desired and over cooling coil when cooling is desired.
IMPORTANT: The dampers should be adequate to prevent
cooled air from entering furnace. If manually operated, dampers
must be equipped with a means to prevent operation of either
cooling unit or furnace unless damper is in full cool or heat
position.
VENTING INSTRUCTIONS
Venting of furnace should be to the outside and in accordance with
local codes or requirements of local utility.
OIL-FIRED APPLIANCES SHALL BE CONNECTED TO
FLUES HAVING SUFFICIENT DRAFT AT ALL TIMES TO
ENSURE SAFE AND PROPER OPERATION OF APPLIANCE.
For additional venting information, refer to ANSI/NFPA 211
Chimney, Fireplaces, Vents, and Solid Fuel Burning Appliances
and/or CSA B139 Installation Code.
This furnace is certified for use with Type "L" vent (maximum flue
gas temperature 575°F).
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The 6-in. flue elbow shipped with furnace should be attached with
screws to outlet end of heat exchanger. It is a special short radius
elbow. The 75,000, 105,000, and 125,000 Btuh size units are
certified for use with 5-in. pipe if reduction from the 6-in. elbow
is desired.
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If furnace is installed in upflow position, flue pipe clearance
knock-out in top panel should be removed. Install flue elbow so
that it exits furnace cabinet through that opening. For horizontal
installations, 1 of the side panel knock-outs is used. Refer to
Changing from Upflow to Horizontal section.
I. PRE-INSTALLATION VENT SYSTEM INSPECTION
Before furnace is installed, it is highly recommended that any
existing vent system be completely inspected.
For any chimney or vent, this should include the following:
1. Inspection for any deterioration in chimney or vent. If
deterioration is discovered, chimney must be repaired or
vent must be replaced.
2. Inspection to ascertain that vent system is clear and free of
obstructions. Any blockage must be cleared before install-
ing furnace.
3. Cleaning chimney or vent if previously used for venting a
solid fuel burning appliance or fireplace.
4. Confirming that all unused chimney or vent connections are
properly sealed.
5. Verification that chimney is properly lined and sized per the
applicable codes. (Refer to list of codes in Safety Consid-
erations section.)
II. MASONRY CHIMNEY
This furnace can be vented into an existing masonry chimney. This
furnace must not be vented into a chimney servicing a solid fuel
burning appliance. Before venting furnace into a chimney, the
chimney MUST be checked for deterioration and repaired if
necessary. The chimney must be properly lined and sized per local
or national codes.
If furnace is vented into a common chimney, the chimney must be
of sufficient area to accommodate the total flue products of all
appliances vented into chimney.
The following requirements are provided for a safe venting
system:
1. Be sure that chimney flue is clear of any dirt or debris.
2. Be sure that chimney is not servicing an open fireplace.
3. Never reduce pipe size below minimum certified furnace
pipe size shown in Table 2.
TABLE 2—MINIMUM CERTIFIED FURNACE PIPE SIZE
UNIT SIZE
036075
036105
048125
060155
4. All pipe should be supported using proper clamps and/or
straps. These supports should be at least every 4 ft.
5. All horizontal runs of pipe should have at least 1/4 in. per
ft of upward slope.
6. All runs of pipe should be as short as possible with as few
turns as possible.
7. Seams should be tightly joined and checked for leaks.
8. The flue pipe must not extend into chimney but be flush
with inside wall.
9. The chimney must extend 3 ft above highest point where it
passes through the roof of a building and at least 2 ft higher
than any portion of a building within a horizontal distance
of 10 ft. It shall also be extended at least 5 ft above highest
connected equipment flue collar.
10. Check local codes for any variance.
III. FACTORY-BUILT CHIMNEYS
Listed factory-built chimneys may be used. Refer to chimney
manufacturer's instructions for proper installation.
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MINIMUM PIPE DIAMETER (IN.)
5
5
5
6
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