Lubrication; Cooling Section Maintenance - Rheem RRNL Installation Instructions Manual

32
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.
C. 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.
D. COOLING SECTION MAINTENANCE
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.
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.
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. Unplug the wires from the circulating air blower and the limit control. Remove the
two screws and slide the blower out of the unit sideways.
3. Shine a flashlight on the evaporator coil (both sides) and inspect for accumulation of
lint, insulation, etc.
4. If coil requires cleaning, follow the steps shown below.
Cleaning Evaporator Coil
1. Remove screws from condenser fan grille assembly and lay grille over on the unit
top panel.
2. Remove the controls access panel and the control box cover.
3. Disconnect the outdoor fan motor wiring from the compressor contactor and capaci-
tor. Remove the strain relief in the bulkhead and pull the fan motor wires through.
Set grille assembly to the side.
4. Remove the screws that secure the unit top to the unit. Remove the top and set the
unit top to the side.
5. The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vacu-
um it with a soft brush attachment. Be careful not to bend the coil fins.
6. 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.
7. Go to next section for cleaning the condenser coil.
Cleaning Condenser Coil, Drain Pan, Condensate Drain, Condenser Fan,
Circulation Air Blower and Venturi
1. Remove the screws from the condenser coil protective grille and remove the grille
from the unit. Ensure the filter access panel is still removed to access all of the
screws securing the grille.
2. 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.