40
441 01 2121 01
h. Re−install vent connector.
NOTE: Should switch remain open longer than 3 minutes,
furnace control board will lockout the furnace for 3 hours. To
reset furnace control board, turn thermostat below room
temperature or from HEAT to OFF and turn 115−v power
OFF, then back ON.
3. Check Pressure Switch(es)
This control proves operation of the draft inducer
blower.
a. Turn off 115−v power to furnace.
b. Disconnect inducer motor lead wires from wire har-
ness.
c. Turn on 115−v power to furnace.
d. Set thermostat to “call for heat” and wait 1 minute.
When pressure switch is functioning properly, hot
surface igniter should NOT glow and control dia-
gnostic light flashes a status code 32. If hot surface
igniter glows when inducer motor is disconnected,
shut down furnace immediately.
e. Determine reason pressure switch did not function
properly and correct condition.
f. Turn off 115−v power to furnace.
g. Reconnect inducer motor wires, replace outer door,
and turn on 115−v power.
h. Blower will run for 90 seconds before beginning the
call for heat again.
i. Furnace should ignite normally.
Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify that switches SW1−1 and SW1−6 are OFF and
other setup switches are set as desired. Verify that
switches SW1−7 and SW1−8 for the blower OFF
DELAY are set as desired per Table 10.
3. Verify that blower and burner access doors are prop-
erly installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer’s in-
structions.
6. Review User’s Guide with owner.
7. Attach literature packet to furnace.
SERVICE AND MAINTENANCE
PROCEDURES
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
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in
environmental pollution.
Remove and recycle all components or materials (i.e.
oil, refrigerant, control board, etc.) before unit final
disposal.
CAUTION
!
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.
!
WARNING
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.
CAUTION
!
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 Figure 4, you must revise your orientation
to component location accordingly.
Electrical Controls and Wiring
ELECTRICAL SHOCK 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.
!
WARNING
The electrical ground and polarity for 115−v wiring must be
properly maintained. Refer to Figure 25 for field wiring
information and to Figure 56 for furnace wiring information.
NOTE: If the polarity is not correct, the STATUS LED on the
control will flash status code 10 and 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 Figure 26) 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 turn off 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) to aid in installation,
servicing, and troubleshooting. Status codes can be viewed
at the sight glass in blower access door. The amber furnace
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