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935SA: Installation, Start-up, Operating and Service Maintenance Instructions
5. Inspect any accessories attached to the furnace such as a humidifier
or electronic air cleaner. Perform any service or maintenance to the
accessories as recommended in the accessory instructions.
Cleaning and/or Replacing Air Filter
The air filter type may vary depending on the application or orientation.
The filter is external to the furnace casing. There are no provisions for an
internal filter with this furnace. See "Filter Arrangement" under the
"Installation" section of this manual.
NOTE: If the filter has an airflow direction arrow, the arrow must point
toward the blower.
To clean or replace filters, proceed as follows:
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death,
or property damage.
Before installing, modifying, or servicing system, main electrical
disconnect switch must be in the OFF position and install a lockout tag.
There may be more than one disconnect switch. Lock out and tag
switch with a suitable warning label. Verify proper operation after
servicing. Always reinstall access doors after completing service and
maintenance.
1. Turn off electrical supply to furnace.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable filter, clean filter by spraying
cold tap water through filter in opposite direction of airflow. Rinse
filter and let dry. Oiling or coating of the filter is not recommended.
5. If equipped with factory specified disposable media filter, replace
only with a factory specified media filter of the same size.
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
Blower Motor and Wheel Maintenance
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Blower access door switch opens 115-v power to control. No
component operation can occur unless switch is closed. Caution must
be taken when manually closing this switch for service purposes.
NOTE: The blower wheel should not be dropped or bent as balance will
be affected. The following steps should be performed by a qualified
service agency.
To ensure long life and high efficiency, clean accumulated dirt and
grease from blower wheel and motor annually.
The inducer and blower motors are pre-lubricated and require no
additional lubrication.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove blower door.
3. All factory wires can be left connected, but field thermostat
connections may need to be disconnected depending on their length
and routing.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4. Remove two screws holding blower assembly to blower deck and
slide blower assembly out of furnace.
NOTE: On 66100E21 size, the top screw securing blower to shelf must
be removed in order to remove the blower. (See
5. Clean blower wheel and motor using a vacuum with soft brush
attachment. Blower wheel blades may be cleaned with a small paint
or flux brush. Do not remove or disturb balance weights (clips) on
blower wheel blades.
6. Vacuum any loose dust from blower housing, wheel and motor.
7. 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:
NOTE: Before disassembly, mark blower motor, and blower housing so
motor and each arm is positioned at the same location during
reassembly.
a. Disconnect ground wire attached to blower housing.
b. Remove screws securing cutoff plate and remove cutoff plate
from housing.
c. Loosen set screw holding blower wheel on motor shaft (160+/-20
in.-lb. when reassembling).
d. Remove bolts holding motor to blower housing and slide motor
out of wheel (40+/-10 in.-lb. when reassembling).
e. Remove blower wheel from housing.
f. Clean wheel and housing.
8. Reassemble motor and blower by reversing steps 7d finishing with
7a. Be sure to reattach ground wire to the blower housing.
NOTE: On 66100E21, ensure that the blower wrapper sits on top of the
two tabs on blower sidewalls.
9. Verify that blower wheel is centered in blower housing and set
screw contacts the flat portion of the motor shaft. Loosen set screw
on blower wheel and reposition if necessary.
10. Spin the blower wheel by hand to verify that the wheel does not rub
on the housing.
11. Reinstall blower assembly in furnace.
12. Reinstall two screws securing blower assembly to blower deck.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in shortened heat exchanger
life.
Heating fan speed(s) MUST be adjusted to provide proper air
temperature rise as specified on the rating plate. Recommended
operation is at the midpoint of the rise range or slightly above. Refer to
"SET TEMPERATURE RISE" under START-UP, ADJUSTMENT, and
SAFETY CHECK.
NOTE: Refer to motor speed lead relocation if leads were not identified
before disconnection
(Table
13. Refer to furnace wiring diagram, and connect thermostat leads if
previously disconnected.
14. To check blower for proper rotation:
a. Turn on electrical supply.
52
Fig.
65)
(Fig.
65)
CAUTION
11).
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