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WARNING
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN SEVERE PERSONAL INJURY
OR DEATH.
WARNING
LABEL ALL WIRES PRIOR TO DIS-
CONNECTION WHEN SERVICING
THE UNIT. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGER-
OUS OPERATION RESULTING IN
FIRE, ELECTRICAL SHOCK,
PROPERTY DAMAGE, SEVERE
PERSONAL INJURY OR DEATH.
instructions, 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 pre-
vent overheating.
COOLING SECTION MAINTENANCE
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. Open the control/filter access panel and remove filters. Also, remove blower
access panel. In downflow applications remove the horizontal return to gain
access.
2. Shine a flashlight on the evaporator coil (both sides) and inspect for accumula-
tion 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, vac-
uum 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
solution. Rinse the coil thoroughly with water. IMPORTANT: Do not use exces-
sive 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 condenser access end panel and/or compressor access louver
panel. Disconnect the wires to the condenser fan motor in the control box (see
wiring diagram).
2. The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vac-
uum it with a soft brush attachment. Be careful not to bend the coil fins.
3. If the coil is coated with oil or grease, clean it with a mild detergent-and-water
solution. Rinse the coil thoroughly with water. IMPORTANT: Do not use exces-
sive 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.
4. The venturi should also be inspected for items of obstruction such as collections
of grass, dirt or spider webs. Remove any that are present.
5. Inspect the circulating air blower wheel and motor for accumulation of lint, dirt or
other obstruction and clean it necessary. Inspect the blower motor mounts and
the blower housing for loose mounts or other damage. Repair or replace if nec-
essary.
Re-assembly
1. Reconnect fan motor wires per the wiring diagram attached to the back of the
control cover.
2. Replace the control box cover.
3. Close the filter/control access panel and replace the blower/evaporator coil
access panels.
4. Restore electrical power to the unit and check for proper operation, especially the
condenser fan motor.
IX. WATER HEATING SECTION MAINTENANCE
LIME AND SCALE FLUSHING PROCEDURE
Periodic flushing is required for the refrigerant-to-water heat exchanger contained in
the Rheem H
AC rooftop unit to remove lime and scale buildup and to prevent
2
degradation of water heating performance. How often this is required depends on the
39
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Troubleshooting
