PROCEDURE 5—FILTER ARRANGEMENT
WARNING: Never operate unit without a filter or with filter access door removed. Failure to follow this warning can cause fire, personal injury, or death.
The air filter arrangement will vary due to application, furnace orientation, and filter type. The filter may be installed in an external Filter/Media cabinet (if provided) or the furnace blower compartment. Factory supplied washable filters are shipped in the blower compartment.
If a
If installing the filter in the furnace blower compartment, determine location for filter and relocate filter retaining wire if necessary. See Table 2 to determine correct filter size for desired filter location. Table 2 indicates filter size, location, and quantity shipped with this furnace. See Fig. 2 for location and size of bottom and side
Table 2—Filter Information
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE | FILTER SIZE (IN.)* |
| FILTER | |
CASING |
|
|
| |
Side Return |
| Bottom Return | TYPE | |
WIDTH (IN.) |
| |||
|
| |||
(1) 16 X 25 X 1† |
| (1) 16 X 25 X 1† | Cleanable | |
21 | (1) 16 X 25 X 1 |
| (1) 20 X 25 X 1† | Cleanable |
(1 or 2) 16 X 25 X 1 |
| (1) 24 X 25 X 1† | Cleanable | |
|
|
|
|
|
*Filters may be field modified by cutting filter material and support rods (3) in filters. Alternate sizes and additional filters may be ordered from your dealer.
†
CAUTION: Use care when cutting support rods in filters to protect against flying pieces and sharp rod ends. Wear safety glasses, gloves, and appropriate protective clothing. Failure to follow this caution could result in personal injury.
CAUTION: For airflow requirements above 1800 CFM, see Air Delivery table in Product Data literature for specific use of single side inlets. The use of both side inlets, a combination of 1 side and the bottom, or the bottom only will ensure adequate return air openings for airflow requirements above 1800 CFM.
NOTE: Side
WASHABLE
FILTER
FILTER
RETAINER
A93045
Fig. 23—Filter Installed for Side Inlet
PROCEDURE 6—BOTTOM CLOSURE PANEL
These furnaces are shipped with bottom enclosure panel installed in bottom
To remove bottom closure panel, perform the following:
1.Tilt or raise furnace and remove 2 screws holding front filler panel. (See Fig. 25.)
2.Rotate front filler panel downward to release holding tabs.
3.Remove bottom closure panel.
4.Reinstall front filler panel and screws.
PROCEDURE 7—GAS PIPING
Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC in the United States. Canadian installations must be made in accordance with NSCNGPIC and all authorities having jurisdiction.
Gas supply line should be a separate line running directly from meter to furnace, if possible. Refer to Table 3 for recommended gas pipe sizing.