Oil Furnace Owner Information

506792-01B Page 3 of 6Issue 1216
Upow Units
To replace the lter in an upow unit, refer to the following
directions and Figure 2.
Side Return
To replace the lter in a furnace with an external lter rack
or cabinet on either side of the furnace cabinet:
1. Turn off the power to unit.
2. The lter(s) may be removed by sliding toward the front.
Replace in a reverse procedure.
Bottom Return
To replace the lter in a furnace with a bottom return air:
1. Turn off the power to unit.
2. Remove lower front panel by lifting up and pulling out.
3. The lter(s) may be removed by sliding toward the front.
Replace in a reverse procedure.
Basement Units
To replace the lter in a basement unit (see Figure 3):
1. Turn off power to unit.
2. Remove lower rear panel by lifting up and pulling out.
3. The lter(s) may be removed by sliding out through the
rear of the furnace. To reinsert, place lter on the two
lter supports and slide into unit.
Restore power to the furnace after the door or panel has
been replaced and check furnace for proper operation. If
the unit does not operate, call your dealer for service.
Lubrication
Lubrication of the bearings in the circulating air blower motor
and the combustion blower motor is not recommended.
Side Return
Bottom Return
R/A
Duct
Fi lter Rack
Filter
(slides in from front of unit)
Filter
Base
Side
Panel
Front
Panel
Upow Units: Filter Replacement
Figure 2
Filter
Rear
Of
Furnace
Filter
Supports
Basement Units: Filter Replacement
Figure 3
The unit may contain either a disposable lter or a permanent
lter. The type of lter may be indicated on a label attached
to the lter. If a disposable lter is provided, replace with the
same type and size as the original lter. If a permanent lter
is provided, clean lter and place back in furnace. To clean
a permanent lter, shake lter to remove excess dirt and/
or use a vacuum cleaner. Wash lter in soap or detergent
water and replace after lter is dry.
If your air distribution system has a central return air lter-
grille, you do not need a lter in your furnace. Be sure to
clean the lter-grille as recommended above.
Dirty lters are the most common cause of inadequate
heating or cooling performance. A clogged lter will not
permit adequate airow. This can cause heat exchanger
failure or cooling coil freeze-up along with the accompanying
costly service calls.
The dealer may have changed the filter size, so the
information provided in Table 1 may not apply to your
installation.
Always measure the original lter and replace with the same
size and type.
Table 1
Factory-Supplied Filters
Models BOLHF and BOLHR are not equipped with factory-supplied
lters. The lters for these units are supplied in the eld.
Models Size
BOLUF 16” X 25”
BOLBF, BOLBR (57/72, 84/95) 18” X 19”
BOLBF, BOLBR (112/125) 19” X 21”
BOLBR (140/168) 20-1/8” X 22-7/16
BOLBR (168/196) 24-5/8” X 24-3/8”