Carrier 58GS - Manual (Page 12)

8. 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.
9. Lubricate motor.
a. Remove dust caps or plugs from oil ports
located at each end of motor.
b. Use a good grade of SAE 20 nondetergent
motor oil and put 16 to 25 drops in each oil
port.
c. Allow time 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.
10. 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 cutoff plate from housing.
c. Lift blower wheel from housing thru
opening.
11. Clean blower wheel and motor by using vacuum
with soft brush attachment. Care must be exer­
cised not to disturb balance weights (clips) on
blower wheel vanes. Also, do not drop or bend
wheel, as balance will be affected.
12. Reassemble blower by reversing procedures 10a
thru c. Be sure wheel is positioned for proper
rotation.
13. Reassemble motor and blower by reversing
procedures 4 thru 8. If motor has ground wire,
be sure it is connected as before.
14. Reinstall blower assembly in furnace.
15. Connect electrical leads to Molex speed
selector. Please note that connections are
polarized for assembly — do not force.
16. Turn on electrical power and check for proper
rotation and speed changes between heating
and cooling.
Cleaning Heat Exchanger — If it becomes neces­
sary to clean the heat exchanger because of carbon
deposits, soot, etc., proceed as follows:
1. Turn off gas and electrical supply.
2. Remove access panels.
3. Remove vent connector and draft diverter.
Screws are located inside draft diverter opening.
Remove chokes.
FLUE b a f f l e s
4.
5.
6
.
7.
Remove flue baffles from flue outlets of heat
exchanger. See Fig. 13.
Remove secondary air baffle and burners. To
remove pilot burner, disconnect pilot supply
tube at gas valve.
Clean flue ways with brush and/or vacuum.
Check heat exchanger for leaks and cracks.
Replace if necessary.
Fig. 13 — Removing Baffles
8. Replace flue baffles and chokes. Be sure all
screws are in place and tight.
9. Replace draft diverter and vent connector. Be
sure screws are replaced and tight.
10. Replace secondary air baffle and burners.
11. Turn on gas and electricity. Check for gas leaks.
WARNING: Never use a match or other open
flame to check for gas leaks. Use a soap-and-
water solution.
Pilot — Pilot should be checked and cleaned if
necessary at the beginning of each heating season.
Pilot flame should be high enough for proper
impingement of the flame sensing probe. Remove
accumulation of soot, dirt, and carbon from probe
and electrode if necessary.
Electrical Controls and Wiring
NOTE: There may be more than one electrical
supply to unit.
With power disconnected to unit, check all
electrical connections for tightness. Tighten all
screws on electrical connections. If any smoky or
burned connections are noticed, disassemble the
connection, clean all parts and stripped wire, and
reassemble properly and securely. Electrical con­
trols are difficult to check without proper instru­
mentation. Therefore, reconnect electrical power to
unit and observe unit thru one complete operating
cycle. If there are any discrepancies in the operating
cycle, contact your Dealer and request service.
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