Maintenance - Daikin DFG Series Installation Instructions Manual

MAINTENANCE

ELECTRIC SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or property
damage. Improper servicing could result in dangerous
operation, serious injury, death or property damage.
• Before servicing, disconnect all electrical power to
furnace.
• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
• Verify property operation after servicing.
HIGH VOLTAGE
Disconnect all power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
To prevent personal injury or death due to improper
installation, adjustment, alteration, service or maintenance,
refer to this manual. For additional assistance or
information, consult a qualified installer, service agency or
the gas supplier.
Sheet metal parts, screws, clips and similar items inherently
have sharp edges, and it is necessary that the installer and
service personnel exercise caution.
This unit must be ISOLATED from the gas supply piping sys-
tem by closing its individual manual shutoff valve during
any pressure testing equal to or less than 1/2 psig.
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, set screws, and wire connections.
2. Clean evaporator mechanically or with cold water, if nec-
essary. Usually any fouling is only matted on the entering
air face of the coil and can be removed by brushing.
3. Replace filters as needed (see below).
4. Check for blockage of condensate drain.
5. Check power and control voltages.
6. Check running amperage.
7. Check operating temperatures and pressures.
8. Check and adjust temperature and pressure controls.
9. Check and adjust damper linkages.
WARNING
WARNING
WARNING
CAUTION
CAUTION
10. Check operation of all safety controls.
11. Examine gas furnaces (see below and the User's Informa-
tion Manual).
12. Check condenser fans and tighten set screws.
Filters
To prevent property damage due to fire and loss of equip-
ment 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.
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 con-
ditions 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.
Cabinet Finish Maintenance
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.
Condenser and Induced Draft Motors
Bearings on the condenser fan motors and the combustion fan
motor are permanently lubricated. No additional oiling is re-
quired.
Lubrication
The fan shaft bearings and the supply fan motor have grease
fittings that should be lubricated during normal maintenance
checks.
Clean Outside Coil
The coil with the outside air flowing over it should be inspect-
ed annually and cleaned as frequently as necessary to keep the
finned areas free of lint, hair and debris. NOTE: clean the coil in
the opposite direction of air flow.
Maintenance of MicroChannel Heat Exchangers
(MCHE)
Frequent servicing is essential to maintaining the required MCHE
performance. For every installed Danfoss MCHE, service records
must be documented.
22
CAUTION