Friedrich Kuhl KCQ06A10A User manual

1 PB
Service Manual
Room Air Conditioners
Q Chassis Models
Kühl KCQ06A10A, KCQ08A10A, KCQ10A10A,
KCQ10A10B
115-Volt:
Kühl +
Electric Heat
115-Volt:
93001404_03
KEQ08A11A

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Table of Contents
INTRODUCTION 3
Important Safety Information 3
Personal Injury Or Death Hazards 4
Kühl Control Options 6
Component Identication 7
User Interface 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 11
Electrical Data 12
Circuit Rating/ Breaker/ power cord/ wall Receptacle 12
OPERATION 14
Airow Direction 14
User Interface 15
Control Panel 27
Remote Control 28
Unit 29
General Knowledge Sequence Of Refrigeration 32
ROUTINE MAINTENANCE 33
REMOVE AND INSTALL THE FRONT COVER 33
REMOVE AND INSTALL THE CHASSIS 36
TROUBLESHOOTING 37
Diagnostic Codes 38
Tips 40
COMPONENT TESTING 45
Compressor Checks 45
Capillary Tube Assy (Cool Only Units) 47
Capacitors 48
Heating Element 49
Drain Pan Valve 49
Testing the User Interface and Electronic Control Board 50
Thermistors Description 50
Replace the Electronic Control Board 52
Replace the User Interface 52
R-410A SEALED SYSTEM REPAIR 53
Undercharged Refrigerant Systems 55
Overcharged Refrigerant Systems 56
Restricted Refrigerant System 57
Sealed System Method of Charging/ Repairs 58
Compressor Replacement 59
Compressor Replacement -Special Procedure in Case of Compressor Burnout 60
WIRING DIAGRAMS 61
INTERACTIVE PARTS VIEWER 63
Available Accessories 64
APPENDIX 65
Appendix 1 - Thermistor Resistence Values (This Table Applies to All Thermistors) 65

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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 fol-
lowed.
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 service 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 proce-
dures required for installation and repair, and who is equipped with the proper tools and test instruments required
to service this product.
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 encoun-
tered. 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, désactiver ou
contourner cette l´unité des
dispositifs de sécurité, faire vous
risqueriez de provoquer le feu, les
blessures ou la mort.
No eliminar, desactivar o pasar
por alto los dispositivos 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
opening 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
moderate 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,
ushing etc.
• MECHANICAL HAZARDS:
• Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting,
handling, 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

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INTRODUCTION
Kühl Control Options
The new Kühl gives you a variety of options for control, programming, and scheduling including wireless capabilities.
Wireless Programming and Control:
Friedrich Connect allows you to conveniently control, program, and monitor your air conditioning unit remotely from a smartphone
or computer.
Pre-Programmed Timer Options:
Your unit’s digital control comes equipped with a 24-hour timer.
24-Hour Timer
The 24-hour timer allows you to set 2 temperature changes at pre-set times on the unit control panel.
Customizable Programming Options:
Customizable timers, with up to four temperature adjustments per day, can be set using Friedrich Connect for one or multiple units.
See www.friedrich.com for complete details on Friedrich Connect.
Figure 101 (New Kuhl Options)

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INTRODUCTION
This service manual is designed to be used in conjunction with the installation and operation manuals provided
with each air conditioning system.
This service manual was written to assist the professional service technician to quickly and accurately diagnose
and repair malfunctions.
Installation procedures are not given in this manual. They are given in the Installation/Operation manual which can
be aquired on the Friedrich website.
Model and Serial Number Location
Component Identication
Figure 102 (Component Identication)
Figure 103 (Model and Serial Number Location)
FRIEDRICH
AIRCONDITIONING CO.
SANANTONIO, TX
MODELNUMBER
SERIALNUMBER
VOLTS60 HZ/ 1PH
115
103 VOLT MIN.
COOLING:
BTU/HR
HEATING:
BTU/HR
7500
EER
9.8
AMPS
6.9
4000
EER
AMPS
11.2
MAXAMPS:
23.5 OZS.
DESIGNPRESSURES
600 PSIG HS
300 PSIG LS
U.S. PATENTS
D458, 229 S
5,634,346
IFCONNECTED TO
AFUSE PROTECTED
CIRCUIT, USEA 12 A
TIMEDELAY FUSE
LISTED 183H
AALY00219
EQ08N11-A
ROOM AIR
CONDITIONER
FRIEDRICH
Assembled in Mexico
MODEL NUMBER
AIR CONDITIONING CO.
SAN ANTONIO, TX
SERIAL NUMBER
VOLTS 60 HZ/ 1PH
AALY00219
EQ08N11-A
SYSTEM
MODE
FAN
Condensor Coil
Sleeve
Condensor Fan Blade
Blower Motor
Blower Wheel
Evaporator Coil
User Interface
Relay Board
Compressor

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INTRODUCTION
Model Number Reference Guide
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.
Figure 104 (Model Number Reference Guide)
MODEL TYPE
K - KUHL
W - WALLMASTER
FUNCTION
C - COOL ONLY
E - ELECTRIC HEAT
APPLICATION
Q - PORTABLE
APPROXIMATE COOLING
BTU / HR
ENGINEERING REVSION
LETTER INDICATES AN
ENGINEERING MODIFI-
CATION TO AN EXISTING
MODEL
MARKETING SUFFIX LETTER
INDICATES MODIFICATION TO
AN EXISTING MODEL
HEAT STRIP
0 - STRAIGHT COOL
1 -1.15 KW HEAT STRIP, NOMINAL
VOLTAGE
1 - 115 VOLTS
MODEL INTRODUCTORY
CHARACTER
A - 2019
B - 2020
C - 2021
D - 2022
K C M 21 A 1 0 A - A

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INTRODUCTION
Serial Number Reference Guide
Figure 105 (Serial Number Reference Guide)
YEAR OF MANUFACTURE
17 = 2017 18 = 2018
19 = 2019 20 = 2020
21 = 2021 22 = 2022
MONTH OF MANUFACTURE
01 = JANUARY
02 = FEBRUARY
03 = MARCH
04 = APRIL
05 = MAY
06 = JUNE
07 = JULY
08 = AUGUST
09 = SEPTEMBER
10 = OCTOBER
11 = NOVEMBER
12 = DECEMBER
FACTORY DESIGNATION
M = FRIEDRICH MTY
NUMERIC SEQUENCE
FIRST UNIT OF EACH MONTH = 00001
17 12 M 00001

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SPECIFICATIONS
Refrigeration Systems Performance Data
Conden-
sor Temp
Deg. F
Discharge
Temp
Deg F
Suction
Temp
Deg F
Electrical Ratings
R-410A
REF. Breaker
Model
AMPS
COOL
AMPS
HEAT
LOCKED
ROTOR
AMPS
CHARGE
IN OZ Volt age
60
HERTZ
AMPS
Kühl®(Cool Only)
KCQ06A10A 119 148 55 4.8 25.2 18.8 115 15
KCQ08A10A 116 150 56 6.5 30.5 15.2 115 15
KCQ08A10A-A
KCQ08A10A-B
KCQ08A10A-C
KCQ08A10A-E
KCQ08A10A-F
116 150 56 6.5 30.5 15.2 115 15
KCQ08A10A-D 116 150 56 6.5 30.5 16.7 115 15
KCQ08A10A-G 116 150 56 6.5 30.5 16.7 115 15
KCQ10A10A 119 161 52 8.6 49 19.4 115 15
KCQ10A10B
Kühl®+ (Electric Heat)
KEQ0811A 114 145 48 6.4 11.2 30.5 15.6 115 15
*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all systems use R-410A.
Test done at highest unit fan speed.
Figure 201 (Refrigeration Systems Performance Data)
Model UPC
Cooling
Btu
Heating
Btu Volts
Cooling
Amps
Cooling
Watts
Heating
Amps
Heating
Watts EER CEER
Moisture
Removal-
Pints/HR CFM Sleeve
Kühl®(Cool Only)
KCQ06A10A 724587436570 6000 — 115 4.8 492 — — 12.2 12.1 1.5 190
Q
KCQ08A10A 724587436587 8000 — 115 6.5 661 — — 12.1 12.0 2.1 200
KCQ10A10A 724587436594 9500
— 115 8.6 864 — — 11.0 10.9 3.2 250
KCQ10A10B 9700
Kühl®+ (Electric Heat)
KEQ08A11A 724587432749 7700 4000 115 6.4 694 11.2 1290 11.1 11.0 2.1 200 Q
Figure 202 (Specications)

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Sleeve
Height
Inches
Width
Inches
Depth
with Front
Inches
Shell
Depth
to Louvers
Inches
Minimum
Extension
Into Room*
Inches
Minimum
Extension
Outside
* Inches
Window Width
INCHES
In-wall Installation
Finished Hole Inches
Carton Dimensions
Inches
Minimum** Maximum Height Width
Max. Depth
Height Width Depth
Q14 1/4" 19 3/4" 21 3/8" 8 1/2" 5 1/2" 10 3/4" 22" 42" 14 1/2" 20" 8 1/2" 18 3/4" 22" 25 1/2"
SPECIFICATIONS
Installation
FRONT
SIDE VIEW
SLEEVE DIMENSIONS DRAWING
Installation Clearances
Improper installation of the Air Condtioner can cause poor performance and premature wear of the unit.
Ensure that the KUHL unit is installed with proper clearances as described below.
Ensure no obstructions. or enclosures are within clearances limits to allow for proper airow.
Clearances
Top and Bottom of Unit - One (1) foot
Sides of Unit - One (1) foot
Front of Unit - Three (3) feet
Rear of Unit - Three (3) feet
Figure 203 (Installation Specications)
Figure 204 (Sleeve Dimensions)

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SPECIFICATIONS
Electrical Data
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
All electrical connections and wiring MUST be
the National Electrical Code and all local codes
which have jurisdiction.
Failure to do so can result in personal injury or
death.
NOTICE
FIRE HAZARD
electically unsafe conditions which could cause moderate
or serious property damage.
Read, understand and follow the above warning.
Circuit Rating/Breaker/power cord/ wall Receptacle
Model
Circuit Rating
Breaker or
T-D Fuse
Plug Face
(NEMA#)
Power Cord
Length (ft.)
Required Wall
Receptacle
NEMA NO.
Wall Outlet
Appearance
KCQ06A10A, KCQ08A10A,
KCQ10A10A, KCQ10A10B,
KEQ08A11A
125V - 15A 5 - 15P 65-15R
Wire Size - Use ONLY wiring size recommended by the National Electric Code (NEC) for single outlet branch
circuit.
Fuse/ Circuit Breaker - Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on
unit’s rating plate. Proper circuit protection is the responsibiity of the homeowner.
Grounding - Unit MUST be grounded from branch circuit through service cord to unit, or through separate ground
wire provided on permanently connected units. Be sure that branch circuit or general purpose outlet is grounded.
Receptacle - The eld supplied outlet must match plug on service cord and be within reach of service cord. Do
NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above for proper receptacle
and fuse type.
Figure 205 (Circuit Breaker / Plug / Receptacle / Cord Rating)

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WARNING
Electrical Shock Hazard
Make sure your electrical receptacle has the
same conguration as your air conditioner’s
plug. If different, consult a Licensed Electrician.
Do not use plug adapters.
Do not use an extension cord.
Do not remove ground prong.Always plug into
a grounded 3 prong outlet. Failure to follow
these instructions can result in death, re, or
electrical shock.
Make sure the wiring is adequate for your unit.
If you have fuses, they should be of the time delay type. Before you install or relocate this unit, be sure that the
amperage rating of the circuit breaker or time delay fuse does not exceed the amp rating listed in Table 205.
DO NOT use an extension cord.
The cord provided will carry the proper amount of electrical power to the unit; an extension cord may not.
Make sure that the receptacle is compatible with the air conditioner cord plug provided.
Proper grounding must be maintained at all times. Two prong receptacles must be
replaced with a grounded receptacle by a certied electrician.
The grounded receptacle should meet all national and local codes and ordinances. You must use the three prong plug
furnished with the air conditioner. Under no circumstances should you remove the ground prong from the plug.
Test the power cord.
All Friedrich room air conditioners are shipped from the factory with a Leakage Current
Detection Interrupter (LCDI) equipped power cord. The LCDI device on the end of the cord
meets the UL and NEC requirements for cord connected air conditioners.
To test your power supply cord:
1. Plug power supply cord into a grounded 3 prong outlet.
2. Press RESET (see Figure 206).
3. Press TEST, listen for click; the RESET button trips and pops out.
4. Press and release RESET (Listen for click; RESET button latches and remains in). The power cord is ready for use.
Once plugged in, the unit will operate normally without the need to reset the LCDI device. If the LCDI device fails to trip when
tested or if the power supply cord is damaged, it must be replaced with a new power supply cord from the manufacturer.
NOTICE
Do not use the LCDI device as an ON/OFF switch.
Failure to adhere to this precaution may cause
premature equipment malfunction.
WARNING:
TEST BEFORE EACH USE!
1. PRESS RESET BUTTON.
2. PLUG LCDI INTO POWER
RECEPTACLE.
3. PRESS TEST BUTTON,
RESET BUTTON SHOULD
POP UP.
4. PRESS RESET BUTTON
FOR USE.
DO NOT USE IF ABOVE
TEST FAILS.
RESET
TEST
Green LED
Indicator
Light
(Illuminated
when ready
for use)
SPECIFICATIONS
Electrical Data
Figure 206 (LCDI Power Cord)

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The airow path may be adjusted to distribute air independently from the left or right side of the discharge opening. Each of the
banks of louvers can be directed left, right, up, or down in order to achieve the most optimum airow positioning.
To adjust airow direction, grab the lever in the center of the louver bank and move it in the direction that you would like the air
to be directed. Please note that it is normal that airow may be stronger out of one side of the louvers than the other.
OPERATION
Airow Direction
FIGURE 301 (AIRFLOW ADJUSTMENT)
SYSTEM
MODE
FAN
LEFT AIRFLOW
LEVER
RIGHT AIRFLOW
LEVER

15 PB
OPERATION
User Interface
All of the control panel function buttons and mode icons can be viewed in Figure 302.
Power On – Press the button to turn on the air conditioner. The power button illuminates to indicate that the power is on. The
backlight on the power switch will automatically turn off after 20 seconds of inactivity. The remote control can also be used to
turn power ON / OFF (see Remote Control).
Display – The display is a high efciency LCD with a built-in backlight. After 20 seconds of inactivity, the display switches off.
Touching any button automatically changes the display to full brightness.
There are three control push buttons on each side of the display.
-AUTO-
Automatically switches
between cool & heat
CONTROL
LOCKED
WI-FI OPERATING
STATE
TEMPERATURE
UP
TEMPERATURE
DOWN
2 DIGIT DISPLAY
Shows Setting for:
- Set Point (Temperature)
- Clock (AM/PM)
FILTER
Check / clean
FAN SPEED
Sets fan speed:
LOW, MED, HIGH
FAN
Sets fan to either:
- Automatically cycle
- Continuously run
COOL HEAT FAN ONLY DISCONNECTED FROM
POWER BOARD
MODE
Cycles between
COOL, HEAT, FAN
ONLY or -AUTO-
(if equipped)
ON / OFF
Turns unit on/off
TIMER
shows on or off
Figure 302 (Control Panel and Display)

16 PB
OPERATION
User Interface
Accessing Sub-Menus
The MENU button accesses the sub-menu. See Figure 10.
Figure 304
MENU RETURN
The arrow buttons navigate the 6 menu options (See Figure 306):
– LIM – LOCK
– TM – CnCT
– F-C – diAG
The return button exits the menu. See Figure 305.
Figure 305
MENU RETURN
Figure 306
MENU RETURN

17 PB
OPERATION
User Interface
Navigating Inside the Sub-Menus
The MENU button moves you forward through the sub-menu. See Figure 307.
The return button moves you backward once inside the LIM and TM menus. See Figure 308.
Figure 307
MENU RETURN
Figure 308
MENU RETURN

18 PB
MENU RETURN
OPERATION
User Interface
The LIM Menu (Limit)
This is the limit menu. See Figure 309.
Upon entering the menu, the rst option will be to set the lower setpoint limit using the arrow buttons. See Figure 310.
Then you can set the higher setpoint limit using the arrow buttons. See Figure 311.
Pressing the menu button completes the limit setting. See Figure 312.
Figure 309
Figure 310
MENU RETURN
Figure 311
Figure 312
MENU RETURN
MENU RETURN

19 PB
MENU RETURN
MENU RETURN
OPERATION
User Interface
The TM Menu (Timer)
This is the TM menu used to set a timer. See Figure 313.
In the menu, you set the current time using the arrow buttons. See Figure 314. (Note: These two “set clock” steps will be
skipped if the unit is already connected to Wi-Fi.)
First, set the hour.
Using the MENU button, you switch to the minutes and complete setting the time. See Figure 315.
You select your mode. Either cool, heat, or auto. Toggle these using the mode button. See Figure 316. (Note: cooling-only
models skip this step.)
The process is the same for all three modes. Auto mode will be shown as the example.
Figure 313
MENU RETURN
Figure 314
MENU RETURN
Figure 315
Figure 316

20 PB
MENU RETURN
MENU RETURN
OPERATION
User Interface
The TM Menu (Timer)continued
Auto mode selected. See Figure 317.
Set the cool setpoint for your rst timer period using the arrow buttons. The cooling mode timer only sets the cool setpoint.
See Figure 318.
Next, set the heat setpoint for your rst timer period. The heating mode timer only sets the heat setpoint. See Figure 319.
Note: The auto mode timer sets both the cool and heat setpoint.
Set the time to start the rst timer period. See Figure 320.
Figure 317
Figure 318
MENU RETURN
Figure 319
Figure 320
MENU RETURN