Rheem A18AZ Series - Outdoor Unit Maintenance; Outdoor Coil Cleaning; Cabinet Cleaning and Care

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Table 20: Heating Mode Trouble Shooting Tips
SYSTEM
PROBLEM
INDICATORS
DISCHARGE
PRESSURE
SUCTION
PRESSURE
SUPERHEAT
Normal: 5°–15°F
[2.8° – 8.3°C]
SUBCOOLING
Normal: See
Charging Chart
Overcharge
High High OK High
Undercharge
Low Low OK or High Low
Liquid Restriction
(Filter Drier)
Low Low High High
Low Outdoor Airow
Low Low Low Low
Dirty Indoor Coil High High Low Low
Low Indoor Ambient
Temperature
Low Low OK High
Inefcient
Compressor
Low High High High
Bad Outdoor Suction
Pressure Transducer or
Faulty Measurement
Low Low High High
Poorly Insulated
Outdoor Vapor Line
Thermistor or Bad
Thermistor
High High Low Low
DiagnosticsMaintenance
10.1 Outdoor Coil Cleaning
The outdoor fan draws air across the coil during
operation which results in contaminants collecting on
and between the aluminum fins. These contaminants
restrict the air-flow through the coil resulting in
reduced capacity and efficiency and increases the
temperature of the components that can reduce their
life. Therefore, it is recommended that the outdoor
coil be cleaned at least annually by a qualified service
technician using a non- corrosive coil cleaner and low
pressure water hose sprayer. Care must be taken not
to damage or flatten out the fins by spraying the fins
from an angle. Washing from the top of the coil down
from the inside out is the most effective method of
cleaning the coil. The exterior louver panels and unit
top are easily removable to facilitate the coil cleaning
task.
WARNING:
Disconnect electrical power to the unit before
removing the top panel or any electrical panel
as the fan motor could start at any time and live
electrical connections will be exposed.
10.2 Cabinet Cleaning and Care
Annual cleaning of the exterior cabinet is
recommended using a mild detergent, water, and
cloth/sponge to remove dust, mold, and potentially
corrosive contaminants that have collected on the
cabinet. It is also recommended to apply a good
quality automotive wax to the painted metal cabinet
parts annually to protect the finish and to restore the
gloss of the paint. Do not apply wax to the plastic
parts.
10.3 Motor Lubrication
The ball bearings in the outdoor motor are pre-
lubricated by the motor manufacturer and do not have
oiling ports. The motor will run for an indefinite period
of time without additional lubrication.
10.4 Replacement Parts
Any replacement part used to replace parts originally
supplied on equipment must be the same as or an
approved alternate to the original part supplied. The
manufacturer will not be responsible for replacement
parts not designed to physically fit or operate within
the design parameters the original parts were
selected for.
10.0 OUTDOOR UNIT MAINTENANCE