21
NOTE:
After cleaning, the microamp signal should be stable and in
the range of 4 - 6 microamps DC.
F
LUE
P
ASSAGES
(Q
UALIFIED
S
ERVICER
O
NLY
)
At the start of each heating season, inspect and, if necessary, clean
the unit flue passage.
L
UBRICATION
The fan shaft bearings, the 1 to 2 HP supply fan motors, the con-
denser fan motors and compressors are permanently lubricated.
I
NSPECTION
& C
LEANING
All flue product carrying areas of the furnace, its vent system, and
main burners should be examined by a qualified service agency
before the start of each heating season. This examination is neces-
sary for continued safe operation. Particular attention should be
given to deterioration from corrosion or other sources. This ex-
amination is accomplished in the following manner.
1. Disconnect power to the unit and remove furnace section
access panel.
2. Remove burner assembly:
a. Disconnect the wires from the gas valve after noting which
wires are connected to each terminal.
b. Disconnect wires from the flame rod and ignition
electrode.
c. Disconnect the gas piping at the union.
d. The entire burner assembly can now be removed from
the unit.
NOTE:
Use all screws that were removed; they are necessary for
safe and proper operation of the unit.
3. Inspect and periodically clean the vent outlet (bird screen)
on the access panel.
NOTE:
Periodic observation of the flame and a log of C0
2
measurements are recommended. This will aid in determining
whether the furnace is operating efficiently or if the furnace
requires cleaning.
Flames should be stable, soft and blue (dust may cause orange
tips but must not be yellow). The flames must extend directly out-
ward from the burner without curling, floating or lifting off.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
WARNING
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,
DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY
ADJUSTMENT.
C
ONTACT A QUALIFIED SERVICER AT ONCE IF AN ABNORMAL
FLAME SHOULD DEVELOP.
At least once a year, prior to or during the heating season, make a
visual check of the burner flames.
NOTE:
This will involve removing and reinstalling the heat
exchanger door on the unit, which is held by two screws. If you are
uncertain about your ability to do this, contact a qualified servicer.
If a strong wind is blowing, it may alter the airflow pattern within
the unit enough that an inspection of the burner flames is not
possible.
F
UNCTIONAL
P
ARTS
Refer to the unit Parts Catalog for a list of functional parts. Parts
are available from your distributor.
TROUBLESHOOTING
I
GNITION
C
ONTROL
E
RROR
C
ODES
The following presents probable causes of questionable unit op-
eration. Refer to
Diagnostic Indicator Chart
for an interpretation
of the signal and to this section for an explanation.
Remove the control box access panel and note the number of di-
agnostic LED flashes. Refer to
Diagnostic Indicator Chart
for an
interpretation of the signal and to this section for an explanation.
Internal Control Failure
If the integrated ignition control in this unit encounters an inter-
nal fault, it will go into a “hard” lockout and turn off the diagnostic
LED. If diagnostic LED indicates an internal fault, check power sup-
ply to unit for proper voltage, check all fuses, circuit breakers and
wiring. Disconnect electric power for five seconds. If LED remains
off after restoring power, replace control.
A
BNORMAL
O
PERATION
- H
EATING
C
ODES
External Lockout (1 FLASH CODE)
An external lockout occurs if the integrated ignition control deter-
mines that a measurable combustion cannot be established within
three (3) consecutive ignition attempts. If flame is not established
within the seven (7) second trial for ignition, the gas valve is
deenergized, 15 second inter-purge cycle is completed, and igni-
tion is reattempted. The control will repeat this routine three times
if a measurable combustion is not established. The control will
then shut off the induced draft blower and go into a lockout state.
If flame is established but lost, the control will energize the circu-
lator blower at the heat speed and then begin a new ignition se-
quence. If flame is established then lost on subsequent attempts,
the control will recycle for four (4) consecutive ignition attempts
(five attempts total) before locking out.
