17. Use a stiff brush and vacuum cleaner to clean inside of
primary drum.
CAUTION:
Never use incendiary type cleaners (smoke
sticks) for cleaning!
WARNING:
For all heat exchanger plates that have
been removed, the gaskets MUST be replaced. Failure to
replace gaskets could lead to heat exchanger leakage,
sooting, and a hazardous condition which could lead to
bodily harm.
18. Before reassembly, heat exchanger and combustion cham-
ber should be inspected to determine if replacement is
required. After cleaning, place combustion chamber back
into primary drum and secure with "B" screws. Ensure that
cover plate gasket is in place before tightening screws. Care
must be taken not to damage combustion chamber. The "B"
screws should be tightened to 35-45 lb-in.
19. Tighten "A" nuts to 30 lb-in. of torque (firm, but not overly
tight).
20. Replace intermediate panel, observation tube collar, obser-
vation door, limit wiring, and oil burner.
21. Replace collector box on secondary tube flange, ensuring
proper placement of gasket. Tighten screws to 35-45 lb-in.
of torque.
22. Replace top partition, inside collar on flue pipe, top rear
panel, outside flue collar, and blower door.
23. Reconnect flue pipe and oil line(s).
24. Readjust burner for proper operation. Check limit operation
as outlined in Limit Control Check section.
IV.
BLOWER OILING AND REMOVAL
Periodic oiling of blower motor may be necessary. Check for
instructions on inside of blower access door.
If it is ever necessary to remove blower from furnace:
1. Turn off all electrical power to furnace.
2. Remove blower door.
3. Remove screws securing blower legs to blower rails
mounted on bottom panel of furnace.
4. Slide blower forward on rails toward rear of unit until motor
wire connections at terminal block on motor can easily be
reached and disconnected.
5. Disconnect motor wires at terminal block on motor.
6. Remove blower from unit.
7. Reverse items 1 through 6 to reinstall blower. Refer to
wiring diagram (Fig. 7) of these instructions 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 element.
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.
2. If a permanent filter is used, it can be cleaned with cold
water and soap.
Be sure that filter is thoroughly dry before installing back into
furnace.
→
TABLE 5—AIRFLOW DATA (CFM)
UNIT
SIZE
BLOWER
SPEED
EXTERNAL STATIC PRESSURE IN. WC
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
036105
High
1795
1735
1675
1605
1550
1485
1425
1350
1275
1220
Medium
1365
1335
1305
1275
1255
1215
1155
1105
1050
985
Low
995
965
945
925
900
870
825
775
725
670
048125
High
1905
1845
1770
1695
1630
1565
1490
1425
1325
1220
Medium
1750
1675
1620
1560
1500
1440
1370
1305
1235
1130
Low
1390
1350
1305
1260
1220
1180
1120
1060
985
880
060155
High
2025
1960
1905
1850
1800
1665
1575
1500
1415
1315
Medium
1885
1825
1760
1705
1640
1565
1500
1430
1350
1265
Low
1555
1490
1445
1410
1350
1280
1230
1155
1085
1005
NOTES: 1. Airflow values in cubic ft per minute (CFM) rounded to nearest 5 CFM.
2. Data taken without filters in place.
Fig. 4—Removing Combustion Chamber
A96398
A
B
A95103
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—8—
