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.
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SERVICE AND MAINTENANCE PROCEDURES
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. A qualified service person should inspect
the furnace once a year.
GENERAL
These instructions are written as if the furnace is installed in an upflow
application. An upflow furnace application is where the blower is
located below the combustion and controls section of the furnace, and
conditioned air is discharged upward. Since this furnace can be installed
in any of the 4 positions shown in
, you must revise your
orientation to component location accordingly.
ELECTRICAL CONTROLS AND WIRING
The electrical ground and polarity for 115-V wiring must be properly
maintained. Refer to
for field wiring information and to
for furnace wiring information.
NOTE:
If the polarity is not correct, the STATUS LED on the control
will flash rapidly and Status code (
10.1
) is displayed. This will prevent
the furnace from heating.
The control system also requires an earth
ground for proper operation of the control and flame-sensing electrode.
The 24-V circuit contains an automotive-type, 3-amp. fuse located on
the control, see
. Any shorts of the 24-V wiring during
installation, service, or maintenance will cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp. fuse.
The control LED will
display status code (
24.1
) when fuse needs to be replaced.
Proper instrumentation is required to service electrical controls. The
control in this furnace is equipped with a Status Code LED
(Light-Emitting Diode)
and Major/Minor 3 digit codes
to aid in
installation, servicing, and troubleshooting. The furnace control LED is
either
ON continuously, rapid flashing
or displaying a code composed of
2 digits
.
The major status code is displayed on the LED indicator
through the door with the first digit being the number of short flashes
and the second digit being the number of long flashes. The major status
code is displayed in the first 2 digits of the display. The minor status
code is displayed in the third digit.
For an explanation of status codes, refer to service label located on
blower access door or
and the troubleshooting guide by scanning
the QR code or see FIG # for a brief Troubleshooting Guide.
Retrieving Stored Fault Codes
The stored status code will not be erased from the control memory, if
115-V or 24-V power is interrupted. See the Service Label
for
more information.
1. To retrieve the last 7 fault codes, proceed with the following:
NOTE:
NO thermostat signal may be present at control, and all
blower-OFF delays must be completed.
a. Leave 115-V power to furnace turned on.
b. Remove outer access door.
c. Remove the inner blower door.
d. Depress blower door switch to energize the control board.
e. Press menu/select button until (
FLt
) is displayed.
f. Press Next/Option button to cycle through the fault history.
Faults remain in memory for 72 hours of powered operation after
the last fault occurs. Faults may be manually cleared by selecting
(
CLr
) with the menu/select button.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equipment
failure, periodic maintenance must be performed on this equipment.
WARNING
!
FIRE, INJURY, OR DEATH HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
The ability to properly perform maintenance on this equipment requires
certain knowledge, mechanical skills, tools, and equipment. If you do
not possess these, do not attempt to perform any maintenance on this
equipment other than those procedures recommended in the User’s
Manual.
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal injury or death.
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.
CAUTION
!
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in improper furnace operation
or failure of furnace.
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
There may be more than one electrical supply to the furnace. Check
accessories and cooling unit for additional electrical supplies that must
be shut off during furnace servicing. Lock out and tag switch with a
suitable warning label.
CAUTION
!
SHOCK HAZARD
Failure to follow this caution could result in personal injury.
Do not tape or permanently allow the door switch to be bypassed.
Temporarily press the door switch with one hand while accessing the
service buttons with your other hand. Do not touch uninsulated
electrical components.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
Never store anything on, near, or in contact with the furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners,
or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning compounds,
plastic or plastic containers, gasoline, kerosene, cigarette lighter
fluid, dry cleaning fluids, or other volatile fluids.
3. Paint thinners and other painting compounds, paper bags, or other
paper products.
