Carrier 170 Series Service And Maintenance Instructions page 4

MOUNTING
SCREWS
RELIEF
BOX
GAS
VALVE
CONTROL
→Fig. 6—Model 58PAV Upflow
7. Remove screws holding blower assembly to blower deck and
slide blower assembly out of furnace.
8. Clean blower wheel and motor using a vacuum with soft brush
attachment. Do not remove or disturb balance weights (clips)
on blower wheel blades. The blower wheel should not be
dropped or bent as balance will be affected.
9. If a greasy residue is present on blower wheel, remove wheel
from the blower housing and wash it with an appropriate
degreaser. To remove wheel:
a. Mark blower wheel location on shaft before disassembly to
ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE: Mark blower mounting arms, motor, and blower housing
so motor and each arm is positioned at the same location during
reassembly.
c. Mark blower wheel orientation and cutoff plate location to
ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoff
plate from housing.
e. Remove bolts holding motor and motor mounts to blower
housing and slide motor and mounts out of housing.
Disconnect capacitor and ground wire attached to blower
housing before removing motor. Motor mount belly band
need not be removed unless motor is to be replaced.
f. Remove blower wheel from housing.
The blower wheel should not be dropped or bent as balance
will be affected.
10. Reassemble motor and blower by reversing items 9a through
9f. Be sure to reattach ground wire.
11. Reinstall blower assembly in furnace.
12. Reinstall control and transformer support assembly in furnace.
13. Reconnect blower leads to furnace control and auxiliary limit
switch leads (downflow only).
Refer to furnace wiring diagram, and connect thermostat leads
if previously disconnected. (see Fig. 12.)
FLUE
COLLAR
BLOCKED
VENT
SAFEGUARD
PRESSURE
SWITCH
FLUE
COLLECTOR
BOX
FILTER
RETAINER
WASHABLE
FILTER
A00261
4
AUXILIARY
LIMIT
SWITCH
(WHEN USED)
MOUNTING
SCREWS
RELIEF
BOX
GAS
VALVE
Fig. 7—Model 58RAV Downflow
NOTE: Refer to Table 3 for motor speed lead relocation if leads
were not identified before disconnection.
Table 3—Speed Selector
COLOR SPEED
Black
Yellow (When
Medium-High
present)
Blue Medium-Low
Red
White Common
Heating air speed selection MUST be adjusted to provide
proper air temperature rise as specified on the rating plate.
Failure to adjust the heating speed may shorten heat ex-
changer life.
14. Downflow furnaces only: Reinstall internal vent pipe and
enclosure by reversing items 3a through 3d.
NOTE: A releasing agent such as PAM cooking spray or equiva-
lent (must not contain corn or canola oil, aromatic or halogenated
hydrocarbons or inadequate seal may occur) and RTV sealant
(G.E. 162, 6702, or Dow-Corning 738) are needed before starting
installation. DO NOT substitute any other type of RTV sealant.
G.E. 162 (P771-9003) is available through RCD in 3-oz. tubes.
15. Reinstall vent connector to furnace flue collar. After fully
assembling vent connector to furnace flue collar, securely
fasten vent connector to flue collar with 2 field-supplied,
corrosion-resistant, sheet metal screws located 180° apart and
midway up the collar.
16. Turn on electrical supply. Manually close blower access door
switch. Use a piece of tape to hold switch closed. Check for
proper rotation and speed changes between heating and
cooling by jumpering R to W and then R to Y on furnace
control thermostat terminals.
FLUE
COLLAR
VENT PIPE
ENCLOSURE
CONTROL
BLOCKED
VENT
SAFEGUARD
PRESSURE
SWITCH
MANUAL
RESET LIMIT
SWITCHES
FACTORY-
ATTACHED TO
High Cool
Spare
Heat
Low Spare
L2/COM
A99285