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6. Slide blower forward on rails toward front of unit until
motor wire connections at terminal block on motor can
easily be reached and disconnected.
7. Disconnect motor wires at terminal block on motor and then
disconnect 2 red wires connected to auxiliary limit control
mounted on opposite side of blower.
8. Swing control box out of way of blower and remove blower
from unit.
CAUTION: Be sure blower is adequately supported
when sliding out of mounting rails, especially in horizon-
tal positions, in order to prevent dropping blower and
injuring yourself or damaging blower!
9. Reverse items 1 through 8 to reinstall blower. Refer to
wiring diagram (Fig. 11) of this instruction or diagram
located on inside of louvered door to properly rewire unit.
V. KEEPING FILTERS CLEAN
WARNING: Never operate unit without a filter or with
filter access door removed. Failure to adhere to this
warning could lead to a hazardous condition which could
lead to equipment damage and bodily harm.
As a homeowner, keeping filters clean is your most important
responsibility. A dirty filter reduces efficiency of your system,
causes erratic performance of controls, and could result in damage
to motor or heating equipment.
1. Inspect filters at regular intervals depending upon dirt
conditions. For new homes, check filters every week for 4
consecutive weeks. In all cases, inspect filters at least every
3 to 4 weeks when system is in constant operation. Replace
or clean filter at least at beginning of each season (heating
and cooling) and thereafter as needed.
UNIT
BLOWER
SIZE
SPEED
High
036075
Medium
Low
High
036105
Medium
Low
High
048125
Medium
Low
High
060155
Medium
Low
NOTES: 1. Airflow values in cubic ft per minute (CFM) rounded to nearest 5 CFM.
2. Data taken without filters in place.
→ TABLE 5—AIRFLOW DATA (CFM)
0.1
0.2
0.3
1530
1475
1410
1240
1200
1150
870
850
830
1635
1560
1500
1470
1425
1365
1280
1245
1205
1965
1915
1865
1695
1645
1615
1340
1330
1320
2240
2170
2085
2000
1965
1890
1535
1495
1450
2. If the permanent filter supplied with filter rack becomes
dirty, it can be cleaned with cold water and soap.
Be sure that filter is thoroughly dry before installing back into
furnace.
Minimum filter size and suggested filter material are indicated in
Fig. 8. If different type filter is used, it must be an equivalent high
airflow capacity.
yyy
yyy
→ MINIMUM FILTER DIMENSIONS (IN.)
UNIT
SIZE
036075
036105
048125
060155
Fig. 8—Suggested Filter Material and Dimensions
EXTERNAL STATIC PRESSURE IN. WC
0.4
0.5
0.6
1340
1255
1170
1110
1065
1000
805
765
720
1425
1365
1260
1290
1220
1140
1145
1085
1010
1805
1745
1665
1565
1530
1465
1290
1270
1215
1980
1935
1820
1795
1755
1690
1420
1365
1330
—11—
FILTER SIZE
Side Return
End Return
18-1/8 X 25
20-1/8 X 25
18-1/8 X 25
20-1/8 X 25
18-1/8 X 30
20-1/8 X 30
18-1/8 X 30
20-1/8 X 30
0.7
0.8
0.9
1075
970
855
920
830
705
660
590
480
1165
1040
945
1030
935
825
935
835
710
1590
1515
1445
1410
1335
1255
1180
1125
1045
1750
1665
1590
1625
1555
1480
1275
1205
1125
A95103
1.0
705
555
360
785
695
590
1345
1165
990
1510
1375
1035
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