On all installations without a coil, a removable access panel is recom- mended in the outlet duct such that smoke or reflected light would be observable inside the casing to indicate the presence of leaks in the heat exchanger. This access cover shall be attached in such a manner as to prevent leaks.
The duct system must be properly sized to obtain the correct airflow for the furnace size that is being installed.
Refer to Table 6, "Ratings & Physical / Electrical Data" or the fur- nace rating plate for the correct rise range and static pressures.
If the ducts are undersized, the result will be high duct static pres- sures and/or high temperature rises which can result in a heat exchanger OVERHEATING CONDITION. This condition can result in premature heat exchanger failure, which can result in personal injury, property damage, or death.
DUCT FLANGES
Four flanges are provided to attach ductwork to the furnace. These flanges are rotated down for shipment. In order to use the flanges, remove the screw holding an individual flange, rotate the flange so it is in the upward position and reinstall the screw then repeat this for all 4 flanges.
If the flanges are not used, they must remain in the rotated down posi- tion as shipped.
For duct attachment, | Factory |
if needed. | installed |
FIGURE 1: Duct Attachment
DUCTWORK INSTALLATION AND SUPPLY PLENUM CONNECTION - UPFLOW/HORIZONTAL
Attach the supply plenum to the furnace outlet. The use of an approved flexible duct connector is recommended on all installations. This connection should be sealed to prevent air leakage. The sheet metal should be crosshatched to eliminate any popping of the sheet metal when the indoor fan is energized.
FLOOR BASE AND DUCTWORK INSTALLATION - DOWNFLOW
Installations on combustible material or directly on any floors must use a combustible floor base shown in Figure 8, "Combustible Floor Base Accessory". Follow the instruc- tions supplied with the combustible floor base accessory. This combustible floor base can be replaced with a match- ing cooling coil, properly sealed to prevent leaks. Follow the instructions supplied with the cooling coil cabinet for install- ing the cabinet to the duct connector. Plug intake and vent pipe holes in bottom panel and move grommet to desired vent side exit.
Downflow Air Conditioning Coil Cabinet
The furnace should be installed with coil cabinet part number specifi- cally intended for downflow application. If a matching cooling coil is used, it may be placed directly on the furnace outlet and sealed to pre- vent leakage. For details of the coil cabinet dimensions and installation requirements, refer to the installation instructions supplied with the coil cabinet.
Attach the air conditioning coil cabinet to the duct connector, and then position the furnace on top of the coil cabinet. The connection to the fur- nace, air conditioning coil cabinet, duct connector, and supply air duct must be sealed to prevent air leakage.
COIL INSTALLATION
On all installations without a coil, a removable access panel is rec- ommended in the outlet duct such that smoke or reflected light would be observable inside the casing to indicate the presence of leaks in the heat exchanger. This access cover shall be attached in such a manner as to prevent leaks.
COIL/FURNACE ASSEMBLY - MC/FC/PC SERIES COILS
Furnace
Furnace
UPFLOWDOWNFLOW
FIGURE 2: Vertical Applications
FURNACE ASSEMBLY - MC & FC SERIES COILS
These coils are factory shipped for installation in either upflow or down- flow applications with no conversion.
Position the coil casing over or under the furnace opening as shown in Figure 2, "Vertical Applications" after configuring coil flanges as required see “Coil Flange” section below.
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