Carrier 58DH - Manual (Page 9)

3. Check electrical connections for tightness and
controls for proper operation each heating
season. Service as necessary.
\\ \ n w i i l i .m\ nici li.itin.al n|i!ip-
ment. personal in|iir\ can result from sharp
metal edges, etc. Be careful when rcmo\ing
Air Filter — Each furnace accommodates 2 filters
which are installed in return-air duct. See Fig. 10
and 11. To clean or replace filters:
1. Disconnect electrical power before removing
access panel
2. Remove upper access panel.
3. Reach up behind top plate, tilt filters toward
center of return-air plenum, remove filters. Re­
place or clean as needed.
4. Furnaces are equipped with permanent, wash­
able filters. Clean filters as follows:
a. Clean with tap water.
b. Rinse and let dry. No oiling or coating of
filters is required.
c. Reinstall filters with cross-hatch binding
facing blower.
Blower Motor Wheel
1. Remove blower access panel.
2. Remove vent pipe enclosure.
3. Disconnect vent pipe and remove short piece of
pipe from furnace.
4. Disconnect wires from auxiliary limit on blower
housing.
NOTE: For ease of blower removal, it may be
necessary to remove control box on some sizes.
5. Remove blower assembly from furnace.
6. Remove motor from blower housing.
7. Lubricate motor using good grade of SAE 20
nondetergent motor oil. Put one teaspoon, 5cc,
3 /16 oz., or 16 to 25 drops in each oil port.
8. Remove blower wheel from housing and clean
by using vacuum with soft brush attachment. Be
careful not to disturb balance weights (clips) on
blower wheel vanes.
( \l I ION IR ^UIc muliM i N i u . ) p L i l \ noM-
li.)ii..d !■! Plnw^i hoiiMiii' MnU'i oil ports
iiiiisi hr. at a m m i m i i m oi 4^ aho noii-
/ontal centerline ot motor after blower
assemblv has been reinstalled in lurnace.
9. Reassemble furnace by reversing above
procedures.
When more detailed servicing procedure is re­
quired, see furnace Service Manual available from
dealer.
Fig. 17 — Dual Blower With Left-Hand
Housing and Wheel Removed
Cleaning Heat Exchanger
NOTE: Deposits of soot and carbon indicate that a
problern exists. Action must be taken to correct
the problem.
To clean heat exchanger of carbon deposits,
soot, etc.:
1. Turn off gas and power to furnace.
2. Remove control and blower access doors.
3. Remove vent pipe enclosure and disconnect
vent pipe from relief box.
4. Remove 4 screws that secure relief box to
blower shelf.
5. Disconnect 2 wires from safeguard switch.
6. Disconnect wire harness edge connector from
side of inducer control box.
7. Remove 8 screws that secure flue collector box
to center panel. Use care not to damage sealant.
8. Remove complete inducer assembly from fur­
nace, exposing flue openings.
9. Remove flue choke.
10. Clean cells using field-supplied small wire
brush, steel spring cable, reversible electric drill
and vacuum cleaner:
< a. Assemble wire brush and steel spring cable.
1) Use 4 ft of 1/4-in. diameter high-grade
steel spring cable (commonly known as
drain cleanout or Roto-Rooter cable).
2) Use 1/4-in. diameter wire brush (com­
monly known as 25-caliber rifle cleaning
brush).
NOTE: Items called for in Steps 1 and 2
may be purchased at local hardware store.
3) Remove metal screw fitting from wire
brush to allow insertion into cable.
4) Insert twisted wire end of brush into end
of spring cable, and crimp tight with
crimping tool or strike with ball-peen
hammer. Tightness is very important.
b. Clean each heat exchanger cell.
1) Attach variable-speed reversible drill to
end of spring cable (end opposite brush).