Lubrication; Cooling Section Maintenance - Rheem RKNA SERIES Installation Instructions Manual

22
WARNING
!
DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPT-
ING MAINTENANCE. FAILURE TO DO SO MAY RESULT IN ELECTRICAL
SHOCK OR SEVERE PERSONAL INJURY OR DEATH.

LUBRICATION

IMPORTANT: DO NOT attempt to lubricate the bearings on the blower motor or the
induced draft blower motor. Addition of lubricants can reduce the motor life and void the
warranty.
The blower motor and induced draft blower motor are prelubricated by the manufacturer
and do not require further attention.
A qualified installer, service agency or the gas supplier must periodically clean the
motors to prevent the possibility of overheating due to an accumulation of dust and dirt
on the windings or on the motor exterior. And, as suggested elsewhere in these instruc-
tions, the air filters should be kept clean because dirty filters can restrict air flow and the
motor depends upon sufficient air flowing across and through it to prevent overheating.

COOLING SECTION MAINTENANCE

WARNING
!
DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPT-
ING MAINTENANCE. FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK
RESULTING IN SEVERE PERSONAL INJURY OR DEATH.
It is recommended that at the beginning of each cooling season a qualified installer or
service agency inspect and clean the cooling section of this unit. The following areas
should be addressed: evaporator coil. condenser coil, condenser fan motor and venturi
area.
To inspect the evaporator coil:
1. Remove the filter access panel and the blower/evaporator coil access panel.
Remove the filters.
WARNING
!
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING THE UNIT.
WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION
RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, SEVERE
PERSONAL INJURY OR DEATH.
2. Shine a flashlight on the evaporator coil (both sides) and inspect for accumulation of
lint, insulation, etc.
3. If coil requires cleaning, follow the steps shown below.
Cleaning Evaporator Coil
1. The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vacuum
it with a soft brush attachment. Be careful not to bend the coil fins.
2. If the coil is coated with oil or grease, clean it with a mild detergent-and-water solu-
tion. Rinse the coil thoroughly with water. IMPORTANT: Do not use excessive water
pressure. Excessive water pressure can bend the fins and tubing of the coil and lead
to inadequate unit performance. Be careful not to splash water excessively into unit.
3. Inspect the drain pan and condensate drain at the same time the evaporator coil is
checked. Clean the drain pan by flushing with water and removing any matters of
obstructions which may be present.
4. Go to next section for cleaning the condenser coil.
Cleaning Condenser Coil, Condenser Fan, Circulation Air Blower and Venturi
1. Remove the compressor access panel. Disconnect the wires to the condenser fan
motor in the control box (see wiring diagram). Remove the wires from the opening in
the bottom of the control box.
2. Remove the screws securing the condenser top panel and remove the panel with
condenser fan motor and grille attached.
3. The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vacuum
it with a soft brush attachment. Be careful not to bend the coil fins.
4. If the coil is coated with oil or grease, clean it with a mild detergent-and-water solu-