Daikin DCG Series Service Instructions Manual page 41

SCHEDULED MAINTENANCE
F S (Q
LAME ENSOR UALIFIED
A drop in the flame current can be caused by a nearly invisible
coating on the flame sensor. This coating, created by the fuel
or combustion air supply, can be removed by carefully
cleaning the flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should be stable
and in the range of 4 - 6 microamps DC.
F P (Q
LUE ASSAGES UALIFIED
At the start of each heating season, inspect and, if neces-
sary, clean the unit flue passage.
L
UBRICATION
The fan shaft bearings, the 1 to 2 HP supply fan motors, the
condenser fan motors and compressors are permanently
lubricated.
I & C
NSPECTION 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 exami-
nation is necessary for continued safe operation. Particular
attention should be given to deterioration from corrosion or
other sources. This examination 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
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 outward from the burner without curling, floating or
lifting off.
S O )
ERVICER NLY
S O )
ERVICER NLY
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,
DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY
C
ADJUSTMENT. 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 P
UNCTIONAL ARTS
Refer to the unit Parts Catalog for a list of functional parts.
Parts are available from your distributor.
2
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
WARNING
41