Daikin DCG Series, Installation And Maintenance Manual

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21
Preventive maintenance is the best way to avoid unnecessary ex-
pense and inconvenience. Have this system inspected at regular
intervals by qualified service personnel, at least twice a year. Rou-
tine maintenance should cover the following items:
1. Tighten all belts, set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically or with
cold water, if necessary. Usually any fouling is only matted
on the entering air face of the coil and can be removed by
brushing.
3. Lubricate motor bearings.
4. Align or replace belts as needed.
5. Replace filters as needed (see below).
6. Check for blockage of condensate drain.
7. Check power and control voltages.
8. Check running amperage.
9. Check operating temperatures and pressures.
10. Check and adjust temperature and pressure controls.
11. Check and adjust damper linkages.
12. Check operation of all safety controls.
13. Examine gas furnaces (see below and the User’s
Information Manual).
14. Check condenser fans and tighten set screws.
F
ILTERS
T
O PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OF EQUIPMENT
EFFICIENCY OR EQUIPMENT DAMAGE DUE TO DUST AND LINT BUILD UP
ON INTERNAL PARTS
,
NEVER OPERATE UNIT WITHOUT AN AIR FILTER
INSTALLED IN THE RETURN AIR SYSTEM
.
CAUTION
Every application may require a different frequency of replace-
ment of dirty filters. Filters must be replaced at least every three
(3) months during operating seasons.
Dirty filters are the most common cause of inadequate heating or
cooling performance. Filter inspection should be made at least
every two months; more often if necessary because of local condi-
tions and usage.
Dirty throwaway filters should be discarded and replaced with a
new, clean filter.
Disposable return air filters are supplied with this unit. See the
unit Specification Sheet or Technical Manual for the correct size
and part number. To remove the filters, remove the filter access
panel on return side of the unit.
C
ABINET
F
INISH
M
AINTENANCE
Use a fine grade automotive wax on the cabinet finish to maintain
the finish’s original high luster. This is especially important in in-
stallations with extended periods of direct sunlight.
C
ONDENSER AND
I
NDUCED
D
RAFT
M
OTORS
Bearings on the condenser fan motors and the combustion fan
motor are permanently lubricated. No additional oiling is required.
L
UBRICATION
The fan shaft bearings and the supply fan motor have grease fit-
tings that should be lubricated during normal maintenance checks.
C
LEAN
O
UTSIDE
C
OIL
(Q
UALIFIED
S
ERVICER
O
NLY
)
The coil with the outside air flowing over it should be inspected
annually and cleaned as frequently as necessary to keep the finned
areas free of lint, hair and debris.
F
LAME
S
ENSOR
(Q
UALIFIED
S
ERVICER
O
NLY
)
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
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.
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 nec-
essary 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 three 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.