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3
Introduction
This service manual is designed to be used in conjunction with the installation manuals provided with each air
conditioning system component. Air conditioning systems consist of BOTH an evaporator (indoor section) and a
condenser (outdoor section) in one closed system, and a room thermostat. When so equipped, accessories such as
electric strip heaters are also considered part of the system.
This service manual was written to assist the professional HVAC service technician to quickly and accurately diagnose
and repair any malfunctions of this product.
This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).
IMPORTANT: It will be necessary for you to accurately identify the unit you are
servicing, so you can be certain of a proper diagnosis and repair.
(See Unit Identifi cation.)
The information contained in this manual is intended for use by a qualifi ed service technician who is familiar
with the safety procedures required in installation and repair, and who is equipped with the proper tools and
test instruments.
Installation or repairs made by unqualifi ed persons can result in hazards subjecting the unqualifi ed person
making such repairs to the risk of injury or electrical shock which can be serious or even fatal not only to them,
but also to persons being served by the equipment.
If you install or perform service on equipment, you must assume responsibility for any bodily injury or property
damage which may result to you or others. Friedrich Air Conditioning Company will not be responsible for any
injury or property damage arising from improper installation, service, and/or service procedures.
WARNING