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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 discharge 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 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.
PROCEDURE 1—VENTING
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).
PROCEDURE 2—INSTALLATION OF FLUE ELBOW ON 075–155 SIZE UNITS
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
075, 105, and 125 size units are certified for use with 5 in. pipe if reduction from the 6 in. elbow is desired.
If 075–155 size units are installed in the 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 of these furnace sizes, 1 of the side panel knock-outs is used. The 210
size unit flue pipe exits from the rear of cabinet, and is not shipped with a flue elbow. Refer to the Changing from Upflow to Horizontal section.
PROCEDURE 3—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 decoration 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 installing furnace.
3. Clearing 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 Considerations section.)
PROCEDURE 4—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 3.
UNIT SIZE
036075
036105
048125
060155
060210
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.
INSTALLATION
Table 3–Minimum Certified Furnace Pipe Size
—5—
MINIMUM PIPE DIAMETER (IN.)
5
5
5
6
7
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