Carrier 58DP - Manual (Page 10)

9. Units with motor capacitor, loosen screw in strap hold­
ing capacitor to blower housing and slide capacitor
from under strap.
10. Mark blower wheel, motor, and motor support in rela­
tion to blower housing before disassembly, to insure
proper reassembly.
11. Loosen setscrew holding blower wheel onto motor
shaft.
12. Remove bolts holding motor mount to blower housing
and slide motor and mount out of housing. Some
motors have a ground wire attached to blower housing;
disconnect it also.
13. Lubricate motor.
a. Remove dust caps or plugs from oU ports located at
each end of motor.
b. Use good grade of SAE 20 nondetergent motor oU
and put one teaspoon, 5cc, 3/16 oz., or 16 to 25
drops in each oil port.
c. Allow tune for total quantity of oil to be absorbed
by each bearing.
d. After oiling motor, be sure to wipe excess oil from
motor housing.
e. Replace dust caps or plugs on oil ports.
14. Remove blower wheel from housing.
a. Mark blower wheel orientation and cutoff location
to insure proper reassembly.
b. Remove screws holding cutoff plate and remove cut­
off plate from housing.
c. Lift blower wheel from housing through opening.
15. Clean blower wheel and motor by using vacuum with
soft brush attachment. Care must be exercised not to
disturb balance weights (clips) on blower wheel vanes.
Also do not drop or bend wheel, as balance will be
affected.
16. Reassemble blower by reversing procedures 14a thru
14c. Be sure wheel is positioned for proper rotation.
17. Reassemble motor and blower by reversing procedures
8 thru 12. If motor has ground wire, be sure it is con­
nected as before. Be sure the blower wheel setscrew is
on the flat of the motor shaft when tightening the
setscrew.
18. Reinstall blower assembly in furnace.
19. Reinstall vent enclosure back.
20. Reinstall vent pipe through opening in top plate, secure
to drafthood and connect remainder of vent pipe
assembly.
21. Reinstall vent enclosure front, and secure with screw.
22. Reinstall access panel.
C. Cleaning Heat Exchanger
If it becomes necessary to clean the heat exchanger because
of carbon deposits, soot, etc., proceed as follows:
1. Turn off gas and electrical supply to furnace.
2. Remove front access doors.
3. Remove vent pipe enclosure front and flue pipe.
4. Remove draft diverter. Screws are located inside draft
diverter opening.
5. Remove flue baffles from flue outlets of heat
exchanger.
A79080
Fig. 16—Position of Electrode to Pilot
6. Remove secondary-air shield and burners. To remove
pilot burner, disconnect pilot supply tube (and thermo­
couple on 100% shut-off models) at gas valve.
7. Clean flue ways writh brush and or vacuum. Check heat
exchanger for leaks and cracks. Replace if necessary.
8. Replace flue baffles. Be sure aU screws are in place emd
tight.
9. Replace draft diverter and vent connector. Be sure
screws are replaced and tight.
10. Using vacuum cleaner wdth soft brush attachment,
clean burners. After cleaning, replace burners and
secondary-air shield.
11. Turn on gas and electricity. Check for gas leaks.
A WARNING
Never use a match or other open flame to check for gas
leaks. Use a soap-and-water solution. A failure to
adhere to this warning can cause an explosion, fire, per­
sonal injury, or death.
D. Pilot
Check the pilot and clean if necessary at the beginning of
each heating season. The pilot flame should be high enough
for proper inipingement of the safety element and to light
the burners. Remove the accvunulation of soot and carbon
from the thermocouple safety element or sensing probe.
E. Electrical Controls and Wiring
NOTE:
There may be more them one electrical supply to
unit.
With power disconnected to unit, check aU electrical connec­
tions for tightness. Tighten any screws or electrical connec­
tions. If any smoky or burned connections are noticed, dis­
assemble the connection, clean all parts, and stripped wore,
and reassemble properly and securely. Electrical controls
are difficult to check without proper instrumentation; there­
fore, reconnect electrical power to unit and observe unit
through one complete operating cycle. If there are any dis­
crepancies in the operating cycle, contact your Dealer and
request service.
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