Carrier 58DX - Manual (Page 8)

and add one teaspoon (5 cc, 3/16 oz, or 16 to 25
drops) in each oil port. The use of other types or
grades of oil will damage the motor. Excessive oil­
ing can cause premature bearing failures.
c. Allow time for total quantity of oil to be absorbed
by each bearing.
d. After oiling motor, wipe excess oil from motor
housing.
e. Replace dust caps or plugs on oil ports.
13. Remove blower wheel from housing.
a. Mark blower wheel orientation and cutoff plate loca­
tion to insure proper reassembly.
b. Remove screws securing cutoff plate and remove
cutoff plate from housing.
c. Remove blower wheel from housing.
14. Clean blower wheel and motor by using a vacuum with
soft brush attachment. Be careful not to disturb bal­
ance weights (clips) on blower wheel vanes. Do not drop
or bend wheel because balance wül be affected.
15. Reassemble blower by reversing steps 13a through c.
Be sure wheel is positioned for proper rotation.
16. Reassemble motor and blower by reversing steps 7
through 11. If motor has ground wire, be sure it is
reconnected. Be sure motor oiling plugs are pointed up
when motor is installed, and wheel is centered in blower
housing. Spin blower wheel to check clearance.
17. Reinstall blower assembly in furnace.
18. Reinstall outlet elbow and extension pipe. Be sure con­
nections are tight and leak proof.
19. ReinsteJl vent pipe enclosure.
20. Connect electrical leads to blower speed selector. Note
that coimections are polarized for correct assembly—
DO NOT force.
21. Turn on electrical power and check for proper rotation
and speed changes between heating and cooling; oper­
ate unit 5 minutes and carefully check for condensate
leaks.
C. Cleaning Heat Exchangers
If it becomes necessary to clean the heat exchangers, pro­
ceed as follows:
1. Turn off gas and electrical supphes to furnace.
2. Remove control and blower access panels.
3. Loosen hose clamps on combustion-air pipe and move
air pipe aside.
4. Using backup wrench, disconnect gas supply at ground
joint union. Remove gas pipe from valve.
5. Disconnect pilot leads at 3-circuit connector outside of
burner enclosure.
6. Disconnect high-voltage lead at spark generator.
7. Disconnect electriced wires from gas valve.
8. Disconnect pressure tubing from right-hemd side of
burner enclosure and outlet end of gas VEilve.
9. Remove burner enclosure front.
10. Remove diffuser from inside top of burner enclosure.
Remove screws that secure burner enclosure to cell
panel. These screws are located inside the burner
enclosure.
11. Using care not to damage cell inlet panel gasket, re­
move gas control assembly from furnace.
12. Remove vent pipe enclosure.
13. Loosen hose clamps at vent pipe connection.
14. Loosen hose clamp and remove dredn tube from inducer
outlet elbow.
15. Disconnect edge connector from inducer control box.
16. Loosen hose clamp and remove drain tube from inducer
housing.
17. Remove mounting screws securing inducer assembly to
collector box; remove inducer assembly with outlet
elbow.
18. Remove all old sealant from parts.
19. Remove screws securing intake (upper) couphng box
and remove from furnace. Remove all old sealant from
parts.
20. Remove screws securing primary (lower) coupling box
and remove box. Clean old sealant from parts.
21. Loosen hose clamp and remove 7/8-in. drain tube from
trap.
22. Hold bucket under 7/8-in. drain tube.
23. Using garden hose, ffush each cell of the condensing
heat exchemger with water. Use care not to spray water
on to interior surfaces of control compartment. Dry
aU surfaces. When drying, be careful not to remove
sealant on face of cell panel around individual cell
opemngs.
24. Using ffeld-provided small wire brush, steel “snake”
cable, reversible electric drill, and vacuum cleaner;
clean primary heat exchanger cells. NOTE: DO NOT
use a brush (or other sharp object) to clean the condens­
ing heat exchanger. Damage to the heat exchemger
coating may result. Flush with water and a mild deter­
gent only.
D. Reassemble Furnace
1. Apply sealant releasing agent (Pam) to flange of intake
couphng box.
2. Apply a generous bead (3/16-in. dia) of G.E. RTV 122,
162, or Dow-Corning RTV 738 sealant (NO substitute
is permissible) to flange of couphng box over releasing
agent. Your Distributor should have G.E. RTV 122,
162, or Dow-Corning RTV 738 sealants in stock.
3. Being careful not to smear sealant, position intake cou­
phng box so that slot is on left-hand side and instah
couphng box.
4. Repeat steps 1 thru 3 to instah primary couphng box.
Position box so tahest end is toward right-hand side of
casing.
5. Apply sealant releasing agent (Pam) to cohector box.
6. Apply 1/8-in. diameter bead of G.E. RTV 122, 162, or
Dow-Coming RTV 738 sealant to back of inducer hous­
ing. Apply sealant euround inlet air opening. (The seal­
ant should be about 1/4 in. from the edge of the inlet air
opening.)
7. Using stainless steel screws, instah inducer assembly
on coUector box and support bracket to couphng box.
8. Connect drain tube from collector box to inducer outlet
elbow.
9. Connect smah drain tube from top of trap to fitting on
bottom of inducer housing.
10. Connect 7/8-in. drain tube to trap and coUector box,
and tighten hose clamps.
11. Reconnect vent pipe. Be sure clamps are tight.
12. Reinstah vent pipe enclosure.
13. Check condition of gasket on ceU inlet panel of burner
enclosure. Replace gasket if necessary. See Fig. 10.
14. Instah gas control assembly in furnace,
15. Instah diffuser and burner enclosure front.
16. Reconnect phot leads at 3-circuit connector.
17. Reconnect high-voltage lead to spark generator.