Friedrich Kuhl KCM21A30A User manual

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Service Manual
Standard Chassis Models
Kühl KCS08A10A, KCS10A10A, KCS12A10A, KCS14A10A, KCM14A10A
KCS12A30A, KCS16A30A, KCM18A30A, KCM21A30A KCL24A30A,
KCL24A30B, KCL28A30A, KCL36A30A
KHS10A10A
KHM12A33A, KHM18A34A, KHL24A35A
115-Volt:
230-Volt:
Kühl +
Electric Heat
Kühl +
Heat Pump
230-Volt:
93001403_05
KES12A33A, KES16A33A, KEM18A34A, KEL24A35A, KEL24A35B,
KEL24A35C, KEL36A35A
115-Volt:
230-Volt:
THE EXPERTS IN ROOM AIR CONDITIONING
Kuhl ® Series
Room Air Conditioners
R-410A Refrigerant

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Table of Contents
INTRODUCTION 3
Important Safety Information 3
Personal Injury Or Death Hazards 4
New Kühl Control Options 6
Component Identication 7
Model and Serial Number Location 7
Model Number Reference Guide 8
Serial Number Reference Guide 9
SPECIFICATIONS 10
Refrigeration Systems Performance Data 10
Installation 12
Electrical Data 13
OPERATION 15
Airow Selection and Adjustment 15
User Interface 16
Control Panel 28
Remote Control 29
Unit 30
General Knowledge Sequence Of Refrigeration 36
ROUTINE MAINTENANCE 37
Remove And Install The Front Cover 37
Standard Filter Removal / Installation Instructions 39
REMOVE AND INSTALL THE CHASSIS 41
TROUBLESHOOTING 43
Cooling Sizing Guide 43
Diagnostic Codes 44
Troubleshooting Tips 45
COMPONENT TESTING 53
Capillary Tube and Check Valve Assy (Heat Pump Units) 53
Capillary Tube Assy (Cool Only Units) 54
Reversing Valve Description And Operation 55
Testing The Reversing Valve Solenoid Coil 56
Checking The Reversing Valve 57
Touch Test Chart : To Service Reversing Valves 58
Compressor Checks 59
Fan Motor 61
Capacitors 61
Heating Element 62
Drain Pan Valve 62
Testing the User Interface and Electronic Control Board 63
Thermistors Description 63
Electronic Control Board Identication 64
Replace the Electronic Control Board 65
Replace the User Interface 65
R-410A SEALED SYSTEM REPAIR 66
Refrigerant Charging 67
Undercharged Refrigerant Systems 68
Overcharged Refrigerant Systems 69
Restricted Refrigerant System 70
Sealed System Method of Charging/ Repairs 71
Compressor Replacement 72
Replace The Reversing Valve 74
WIRING DIAGRAMS 75
INTERACTIVE PARTS VIEWER 86
Available Accessories 87
APPENDIX 88
Appendix 1 Thermistor Resistence Values (This Table Applies to All Thermistors) 88

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Your safety and the safety of others is very
important.
We have provided many important safety messages in this manual and on your appliance. Always
read and obey all safety messages.
This is a safety Alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol with the word
“WARNING”
or “CAUTION”. These words mean:
Indicates a hazard which, if not avoided, can result in severe personal
injury or death and damage to product or other property.
Indicates a hazard which, if not avoided, can result in personal injury and
damage to product or other property.
All safety messages will tell you what the potential hazard is, tell you
how to reduce the chance of injury, and tell you what will happen if the
instructions are not followed.
Indicates property damage can occur if instructions are not followed.
WARNING
Refrigeration system
under high pressure
Do not puncture, heat, expose to ame or
incinerate.
Only certied refrigeration technicians
should service this equipment.
R410A systems operate at higher pressures
than R22 equipment. Appropriate safe ser-
vice and handling practices must be used.
Only use gauge sets designed for use with
R410A.
Do not use standard R22 gauge sets.
NOTICE
CAUTION
WARNING
The information in this manual is intended for use by a qualied technician who is familiar with the safety procedures
required for installation and repair, and who is equipped with the proper tools and test instruments required to
service this product.
Due to continuing research in new energy-saving technology, all information in this manual is subject to change
without notice.
Installation or repairs made by unqualied persons can result in subjecting the unqualied person making such
repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical shock which
can be serious or even fatal.
Safety warnings have been placed throughout this manual to alert you to potential hazards that may be encountered.
If you install or perform service on equipment, it is your responsibility to read and obey these warnings to guard
against any bodily injury or property damage which may result to you or others.
Important Safety Information INTRODUCTION

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SAFETY
FIRST
WARNING AVERTISSEMENT ADVERTENCIA
Do not remove, disable
or bypass this unit’s
safety devices. Doing so
may cause re, Doing so
may cause re, injuries,
or death.
Ne pas supprime, désacti-
ver ou contourner cette
l´unité des dispositifs de
sécurité, faire vous risque-
riez de provoquer le feu, les
blessures ou la mort.
No eliminar, desactivar o
pasar por alto los dispositi-
vos de seguridad de la
unidad. Si lo hace podría
producirse fuego, lesiones
o muerte.
ELECTRICAL HAZARDS:
• Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenance, or service.
• Make sure to follow proper lockout/tag out procedures.
• Always work in the company of a qualied assistant if possible.
• Capacitors, even when disconnected from the electrical power source, retain an electrical charge potential
capable of causing electric shock or electrocution.
• Handle, discharge, and test capacitors according to safe, established, standards, and approved procedures.
• Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary to test or
troubleshoot equipment with the power on to the unit.
• Do not spray water on the air conditioning unit while the power is on.
• Electrical component malfunction caused by water could result in electric shock or other electrically unsafe
conditions when the power is restored and the unit is turned on, even after the exterior is dry.
• Use air conditioner on a single dedicated circuit within the specied amperage rating.
• Use on a properly grounded outlet only.
• Do not cut or modify the power supply cord or remove the ground prong of the plug.
• Never operate the unit on an extension cord.
• Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, goggles,
clothing, properly insulated tools, and testing equipment etc.
• Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
INTRODUCTION
Personal Injury Or Death Hazards
WARNING
ALWAYS USE INDUSTRY STANDARD PERSONAL
PROTECTIVE EQUIPMENT (PPE)

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• REFRIGERATION SYSTEM REPAIR HAZARDS:
• Use approved standard refrigerant recovering procedures and equipment to relieve high pressure before open-
ing system for repair. Reference EPA regulations (40 CFR Part 82, Subpart F ) Section 608.
• Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor to moder-
ate injury.
• Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s ame or hot surfaces
can cause serious burns.
• Make certain to protect personal and surrounding property with re proof materials and have a re extinguisher
at hand while using a torch.
• Provide adequate ventilation to vent off toxic fumes, and work with a qualied assistant whenever possible.
• Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks, ush-
ing etc.
• MECHANICAL HAZARDS:
• Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting, han-
dling, or working around unit with moving and/or rotating parts.
• Be careful when, handling and working around exposed edges and corners of the sleeve, chassis, and other unit
components especially the sharp ns of the indoor and outdoor coils.
• Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.
• Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
• PROPERTY DAMAGE HAZARDS
• FIRE DAMAGE HAZARDS:
• Read the Installation/Operation Manual for the air conditioning unit prior to operating.
• Use air conditioner on a single dedicated circuit within the specied amperage rating.
• Connect to a properly grounded outlet only.
• Do not remove ground prong of plug.
• Do not cut or modify the power supply cord.
• Do not use extension cords with the unit.
• Be extremely careful when using acetylene torch and protect surrounding property.
• Failure to follow these instructions can result in re and minor to serious property damage.
• WATER DAMAGE HAZARDS:
• Improper installation, maintenance or servicing of the air conditioner unit can result in water damage to personal
items or property.
• Insure that the unit has a sufcient pitch to the outside to allow water to drain from the unit.
• Do not drill holes in the bottom of the drain pan or the underside of the unit.
• Failure to follow these instructions can result in damage to the unit and/or minor to serious property damage.
INTRODUCTION
PERSONAL INJURY OR DEATH HAZARDS