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