Service Manual
Standard Chassis R-410AModels
Room Air Conditioners
Cool Only
Table Of Contents
IMPORTANT SAFETY INFORMATION
PERSONAL INJURY OR DEATH HAZARDS
ELECTRICAL HAZARDS
MECHANICAL HAZARDS
REFRIGERATION SYSTEM REPAIR HAZARDS
PROPERTY DAMAGE HAZARDS
FIRE DAMAGE HAZARDS
WATER DAMAGE HAZARDS
INTRODUCTION
MODEL AND SERIAL NUMBER LOCATION
Register the air conditioner
Model Number Code
UNIT IDENTIFICATION
RAC Serial Number Identification Guide
S S 08 M 1 0 A
PERFORMANCE DATA
SPECIFICATIONS
Kühl
Kühl + Heat Pump
Keep the filter clean
Installation Information / Sleeve Dimensions
Proper installation of seal gasket
Unit placement
ELECTRICAL DATA
NOTICE
ELECTRIC SHOCK HAZARD
FIRE HAZARD
Test the power cord
Make sure the wiring is adequate for your unit
WARNING: Before Operating Your Unit
DO NOT use an extension cord
Figure
Control Panel Operation
CHECK FILTER
Special Functions
Press the UP to go to the next menu BAND
DIGITAL CONTROL PANELS ACCESS CODES SUMMARY
Key Sequence
Action
Remote Effectiveness
Remote Control Operation
SIDE VIEW
TOP VIEW
Figure
Remote Control Operation Continued
Testing the Display
ELECTRONIC CONTROL SYSTEM MAINTENANCE
Introduction
Display
To Enter the Maintenance Section
Electronic Control System Maintenance Operation
Maintenance Sub-Menus
Temperature Low Limit
Temperature High Limit
M3 – Test Mode Access
The Following functions Can be Tested
M4 – Switch Access Unit Configuration
FACTORY USE ONLY
M5 – Error Codes & History
To Clear Error Codes’ History
Front Panel
UNIT OPERATION
System Set Point Mapping Figure
COOL-HEATSET POINTS
Compressor and Reversing Valve Control
ELECTRONIC CONTROL SEQUENCE OF OPERATION
Cooling Mode
Compressor Operation
Heating Mode Control Operation
Heat Control Operation Heat Pump Only
Heat Control Heat Pump Only
Heat Pump With Electric Heat Operation
If Electric Heat is Available
Condition
Heat Pump With Electric Heat Operation Continued
Automatic Change Over Delay Cool with Heat Units
System Mode Auto
Condition
Heating Fan Delay
Cooling Fan Delay
Fan Speed Change Delay
Compressor Lock Out Time
Fan ICON Detail
Fan Operation Front Panel Mode
Fan Mapping
Mode
Front Panel Display Operation in Wall-StatMode
UNIT OPERATION WITH A WALL-STAT
Thermostat terminals requirements
During Heat Mode
REMOVING THE CHASSIS
REMOVING THE FRONT COVER
ELECTRIC SHOCK HAZARD
ELECTRIC SHOCK HAZARD
REPLACING THE CONTROL BOARD
REPLACING THE INDOOR COIL THERMISTOR
ELECTRIC SHOCK HAZARD
Up Swing Out
Low Voltage Interface Connector
Connecting a Remote Wall Thermostat
Adding a Remote Wall Thermostat
Interface Connector Location Figure Table
Remote Wall Thermostat Location
Air flow direction adjustment
Fresh air and exhaust control
Airflow Selection and Adjustment
CAPACITORS
COMPONENTS TESTING
Capacitor Check with Capacitor Analyzer
Capacitor Connections
NOTE: Always replace with the exact replacement
COMPONENTS TESTING
TESTING THE HEATING ELEMENT
HEATING ELEMENT
REFRIGERATION SEQUENCE OF OPERATION
Refrigeration system under high pressure
R-410ASEALED SYSTEM REPAIR CONSIDERATIONS
Refrigerant Charging
R-410ASEALED REFRIGERATION SYSTEM REPAIRS
EQUIPMENT REQUIRED
EQUIPMENT MUST BE CAPABLE OF
BURN HAZARD
Method Of Charging / Repairs
FREEZE HAZARD
BURN HAZARD
Overcharged Refrigerant Systems
Undercharged Refrigerant Systems
ELECTRIC SHOCK HAZARD
HIGH PRESSURE HAZARD
Restricted Refrigerant System
METERING DEVICE
HERMETIC COMPONENTS CHECK
CHECK VALVE
Capillary Tube Systems
ELECTRIC SHOCK HAZARD
REVERSING VALVE DESCRIPTION/OPERATION
CHECKING THE REVERSING VALVE
TESTING THE REVERSING VALVE SOLENOID COIL
ELECTRIC SHOCK HAZARD
HIGH PRESSURE HAZARD
NOTICE
Procedure For Changing Reversing Valve
Touch Test in Heating/Cooling Cycle
BURN HAZARD
Single Phase Connections
COMPRESSOR CHECKS
Single Phase Running and L.R.A. Test
Locked Rotor Voltage L.R.V. Test
ELECTRIC SHOCK HAZARD
Single Phase Resistance Test
GROUND TEST
CHECKING COMPRESSOR EFFICIENCY
Recommended procedure for compressor replacement
COMPRESSOR REPLACEMENT
HIGH TEMPERATURES
NOTICE
ELECTRIC SHOCK HAZARD
HIGH PRESSURE HAZARD
EXPLOSION HAZARD
EXCESSIVE WEIGHT HAZARD
ROUTINE MAINTENANCE
BLOWER WHEEL / HOUSING / CONDENSER FAN / SHROUD
NOTICE
ROUTINE MAINTENANCE Continued
STEP
ROUTINE MAINTENANCE Continued
Figure
STEP
NOTE: This is a warm weather appliance
CONTROL PANEL BATTERY CHANGE PROCEDURE
Condensation is normal
Frosting
Available Accessories
Service and Assistance
If you require further assistance
Our specialists are able to assist you with
GOOD
HOW IS ALL OF THE INSTALLATION?
= SQ/CU/FT
DATE: _______________
ERROR CODES AND ALARM STATUS
Error
Key Sequence
Problem
TROUBLESHOOTING TIPS
Possible Solution
Possible Cause
Problem
TROUBLESHOOTING TIPS Continued
Possible Solution
Possible Cause
Possible Solution
Problem
Problem
Possible Solution
Possible Solution
Problem
Problem
Possible Solution
Possible Solution
Problem
Problem
Possible Solution
Problem
Possible Solution
Problem
Problem
Possible Solution
REFRIGERANT SYSTEM DIAGNOSIS - COOLING CYCLE
TROUBLESHOOTING CHART - HEAT PUMP
Problem
Problem
REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE
ELECTRICAL TROUBLESHOOTING CHART - HEAT PUMP
HEAT PUMP
SYSTEM COOLS WHEN HEATING IS DESIRED
CORRECTIONS
POSSIBLE CAUSES
NORMAL FUNCTION OF VALVE
MALFUNCTION OF VALVE
Reversing Valve Battery Compartment Max Speed
Transformer voltage Selector Switch 115/230 Volts
User Interface connector
DISCHARGE
REMOTE WALL THERMOSTAT WIRING DIAGRAMS
COOL W/O ELECTRIC HEAT
HEAT PUMP ONLY AND HEAT PUMP WITH ELECTRIC HEAT
SS08M10A, SS10M10A, SS12M10A, SS14M10A
KUHL ELECTRONIC CONTROL COOL ONLY MODELS
SS12M30A, SS15M30A SM18M30A, SM21M30A, SM24M30A
SCHEMATIC
WIRING DIAGRAM
SL28M30A, SL36M30A
SCHEMATIC
KUHL ELECTRONIC CONTROL COOL ONLY MODELS
COOL WITH ELECTRIC HEAT MODELS ES12M33A, ES15M33A
KUHL+ ELECTRONIC CONTROL
EM18M34A, EM24M34A
SCHEMATIC
KUHL+ ELECTRONIC CONTROL
COOL WITH ELECTRIC HEAT MODEL EL36M35A
S C HE MAT IC
L E G E N D
YS10M10A
KUHL+ ELECTRONIC CONTROL HEAT PUMP ONLY MODEL
SCHEMATIC
L E G E N D
PUMP WITH ELECTRIC HEAT MODELS YS12M33A, YM18M34A
HEAT
SCHEMATIC
KUHL+ ELECTRONIC CONTROL
SCHEMATIC
HEAT PUMP WITH ELECTRIC HEAT MODEL YL24M35A
KUHL+ ELECTRONIC CONTROL
L E G E N D
This Table Applies to All Thermistors
THERMISTORS’ RESISTANCE VALUES
Kühl Remote Control
Step 4 Checking the Remote Control’s OPT # Code
Kühl Remote Control
Remote Control
Remote Control’s OPT# Code see example below Fig
Replacement Instructions
Kühl User Interface Service Kit
Ribbon cable connection Mounting screws
INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE
FORM FOR ROOM AIR CONDITIONERS
AHAM PUB. NO. RAC-1
HEAT GAIN FROM
COOLING LOAD ESTIMATE FORM
QUANTITY
FACTORS
Following is an example using the heat load form
HEAT LOAD FORM
HEATING LOAD FORM FRIEDRICH ROOM UNIT HEAT PUMPS
WINDOWS & DOORS Area, sq. ft
INFILTRATION - WINDOWS & DOORS: AVG
ROOM AIR CONDITIONERS LIMITED WARRANTY
FIRST YEAR
SECOND THROUGH FIFTH YEAR
TECHNICAL SUPPORT CONTACT INFORMATION
FRIEDRICH AIR CONDITIONING CO
Post Office Box 1540 · San Antonio, Texas
4200 N. Pan Am Expressway · San Antonio, Texas
Post Office Box 1540 · San Antonio, Texas
FRIEDRICH AIR CONDITIONING CO
4200 N. Pan Am Expressway · San Antonio, Texas
Printed in the U.S.A