Carrier FDT21 Operation & Installation Manual page 10

MAINTENANCE
MAINTENANCE SCHEDULE
Your air conditioner is designed and built with reliable components to provide years of trouble free
dependable service. To preserve your investment for many years to come it is in your interest to
ensure the unit is properly maintained and regularly services as per the schedule stated below.
By End User
Air filter cleaning
Air filter inspection
Remote (battery) – if any
By Licensed Technician
Air filter inspection
Indoor coil
Outdoor coil
Refrigerant charge
Air Filter
It is important to check air filters as per the recommendation above and replace as necessary.
Dirty air filter will not allow the correct amount of air to pass through the cooling/ heating coil,
which effectively will reduce the rated capacities, affect the refrigerant superheating and the overall
operation of your air conditioner.
Indoor Coil
When the air filter is cleaned as per recommended, the indoor coil will require minimal cleaning. The
life span of the indoor coil will be pro-longed for effective heat transfer.
Outdoor Coil
The outdoor coil is required for effective heat transfer between the air conditioner and the external
environment, if the external environment air is dirty the frequency of cleaning should be increased
from the recommendation.
Refrigerant
The refrigerant is the "blood line" of the air conditioning system, the air conditioner will work
efficiently and effectively with the correct amount of refrigerant charge. Systems that run short on
refrigerant charge may eventually cause a compressor burn out.
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OPERATION INSTRUCTIONS
Yearly
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