PG80MSU: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
31
Consult your local dealer about proper frequency of maintenance and the
availability of a maintenance contract.
The minimum maintenance on this furnace is as follows:
1. Check and clean/replace air filter each month or more frequently if
required. Replace if torn.
2. Check burner inlet elbow opening for cleanliness and any visible
debris. Burner assembly removal should only be performed for
troubleshooting and diagnosis of operational issues. Refer to
troubleshooting and service guide.
3. Check blower motor and wheel for cleanliness each heating and
cooling season. Clean as necessary.
4. Check electrical connections for tightness and controls for proper
operation each heating season. Service as necessary.
5. Inspect the vent pipe/vent system before each heating season for
rust, corrosion, water leakage, sagging pipes or broken fittings.
Have vent pipes/vent system serviced by a qualified service agency.
6. 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 arrangement will vary depending on the application. The
filter is exterior to the furnace casing.
NOTE:
If the filter has an airflow direction arrow, the arrow must point
towards the blower.
Table 20 – Filter Size Information (In. / mm)
Media cabinet filter procedures:
1. Turn off electrical supply to furnace before removing filter access
door.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable 3/4-in. (19 mm) 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. See
for size information.
5. If equipped with factory-specified disposable media filter, replace
only with media filter having the same part number and size. For
expandable replacement media, refer to the instructions included
with the replacement media.
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
Blower Motor and Wheel Maintenance
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. These motors can be identified by the absence of
oil ports on each end of the motor.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove outer door.
3. Remove two screws from blower access door and remove blower
access door.
4. All factory wires can be left connected, but field thermostat
connections may need to be disconnected depending on their length
and routing.
5. Remove two screws holding blower assembly to blower deck and
slide blower assembly out of furnace.
6. 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.
7. Vacuum any loose dust from blower housing, wheel and motor.
8. 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 power choke wires (if used) and 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).
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Turn off the gas and electrical supplies to the unit and install lockout tag
before performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace.
WARNING
!
CARBON MONOXIDE POISONING AND FIRE
HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
Never operate unit without a filter or with filter access door removed.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts and servicing furnaces.
FURNACE
CASING
WIDTH
In. (mm)
FILTER SIZE (In. / mm)
FILTER TYPE
Side Return
Bottom Return
17-1/2 (445)
16 X 25 X 3/4 (406
x 635 x 19)
16 X 25 X 3/4
(406 x 635 x 19)
Washable
*
*. Recommended
21 (533)
16 x 25 x 3/4
(406 x 635 x 19)
20 X 25 X 3/4
(508 x 635 x 19)
Washable
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.
