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2
INTRODUCTION
This service manual is designed to be used in conjunction with
the installation manuals provided with each air conditioning
system component.
This service manual was written to assist the professional
RAC service technician to quickly and accurately diagnose
and repair malfunctions.
This manual will deal with subjects in a general nature.
(i.e. all text will not 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).
TABLE OF CONTENTS
Warranty ............................................................................. 3
Routine Maintenance ......................................................... 4
Unit Identifi cation / Nomenclature ...................................... 5
Performance Data ..............................................................6
Electrical Data .................................................................... 7
Functional Component Defi nitions ....................................8
Electronic Controls ......................................................... 8-9
Refrigeration Sequence of Operation ..............................10
Sealed Refrigeration Repairs ...................................... 10-11
Refrigerant Charging ................................................... 12-14
Troubleshooting ...........................................................15-22
Wiring Diagrams ......................................................... 23-35
Return Air Grille/Filter
Discharge Air
Evaporator Coil
Blower Wheel
Capillary Tube
Condenser Fan Blade
Outdoor Grille
Sleeve
Condenser Coil
Compressor
Basepan
Front Cover
System Switches
Reversing Valve
(some models)
Fresh Air
Liquid Filter Driers
Blower Motor
TYPICAL UNIT COMPONENTS
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 unqualified
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.