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Troubleshooting
Related Manuals for Friedrich Kuhl KCS12B10A
Summary of Contents for Friedrich Kuhl KCS12B10A
- Page 1 Room Air Conditioners Kuhl ® Kuhl ® Wallmaster ® R-32 Refrigerant Kühl ® 115-Volt KCS12B10A, KHS10B10A KCM24B30A, KCL28B30A, KCL36B30A 230-Volt: Kühl ® 115-Volt: KCQ08B10A Wallmaster ® WCT16B30A THE EXPERTS IN ROOM AIR CONDITIONING 93001406_00...
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Page 2: Table Of Contents
TABLE OF CONTENTS Table of Contents TABLE OF CONTENTS INTRODUCTION Important Safety Information Personal Injury Or Death Hazards Control Options Component Identification User Interface Model And Serial Number Location Model Number Reference Guide Serial Number Reference Guide SPECIFICATIONS Dimensions Electrical Data Electrical Data -Power Cord OPERATION Airflow Selection and Adjustment -Kuhl... - Page 3 Refrigerant Charging Compressor Replacement Compressor Replacement -Special Procedure in Case of Compressor Burnout Replace The Reversing Valve WIRING DIAGRAMS INTERACTIVE PARTS VIEWER Available Accessories APPENDIX Appendix 1 Thermistor Resistance Values (This Table Applies to All Thermistors) FRIEDRICH AUTHORIZED PARTS DEPOTS...
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Page 4: Introduction
Installation procedures are not given in this manual. They are given in the Installation/Operation manual which can be acquired on the Friedrich website. Click the Link or scan the QR code to be directed to the Professional page where you can locate our technical literature. - Page 5 CAUTION: Do Not Operate Equipment During Active Stages Of Construction To ensure proper operation, Friedrich requires that all equipment is not operated during active construction phases. This includes active stages of completing framing, drywalling, spackling, sanding, painting, flooring, and moulding in the equipment’s designated conditioning space. The use of this equipment during construction could result in premature failure of the components and/or system and is in violation of our standard warranty guidelines.
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Page 6: Personal Injury Or Death Hazards
INTRODUCTION Personal Injury Or Death Hazards WARNING AVERTISSEMENT ADVERTENCIA SAFETY Do not remove, disable Ne pas supprime, désacti- No eliminar, desactivar o or bypass this unit’s ver ou contourner cette pasar por alto los dispositi- FIRST safety devices. Doing so l´unité... - Page 7 INTRODUCTION PERSONAL INJURY OR DEATH HAZARDS • 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. •...
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Page 8: Control Options
Customizable Programming Options: Customizable timers, with up to four temperature adjustments per day, can be set using Friedrich Connect for one or multiple units. This service manual is designed to be used in conjunction with the installation and operation manuals provided with each air conditioning system. -
Page 9: Component Identification
INTRODUCTION Component Identification Compressor Accumulator Reversing Valve Fan Blade Electronic Control Board Condenser Coil Evaporator Coil Fan/Blower Motor Control Key Pad (User Interface) Blower Wheel Figure 101 (Kuhl Component Identification) Condensor Coil Compressor Relay Board Sleeve User Interface Condenser Fan Blade Blower Motor Evaporator Coil Blower Wheel... -
Page 10: Model And Serial Number Location
MODEL NUMBER AIR CONDITIONING CO. YS10M10A SAN ANTONIO, TEXAS SERIAL NUMBER ASSEMBLED IN MEXICO LICY00008 Figure 103 (Kuhl Model and Serial Number Location) FRIEDRICH AIR CONDITIONING CO. SAN ANTONIO, TX Assembled in Mexico MODEL NUMBER SYSTEM EQ08N11-A MODE SERIAL NUMBER... -
Page 11: Model Number Reference Guide
INTRODUCTION Model Number Reference Guide K C M 21 B 3 0 A - A ENGINEERING REVSION LETTER INDICATES AN ENGINEERING MODIFI- CATION TO AN EXISTING MODEL TYPE MODEL K - KUHL W - WALLMASTER MARKETING SUFFIX LETTER INDICATES MODIFICATION TO FUNCTION AN EXISTING MODEL C - COOL ONLY... -
Page 12: Serial Number Reference Guide
FIRST UNIT OF EACH MONTH = 00001 27 = 2027 28 = 2028 MONTH OF MANUFACTURE 01 = JANUARY FACTORY DESIGNATION 02 = FEBRUARY M = FRIEDRICH MTY 03 = MARCH 04 = APRIL 05 = MAY 06 = JUNE 07 = JULY... -
Page 13: Specifications
* KHS10A10A heat pump operates on 115 volt and is not equipped with supplemental heat. Will not provide heat at temperatures below 40˚F. Friedrich room air conditioners are designed to operate in cooling mode with outdoor temperatures from 60˚F to 115˚F. -
Page 14: Dimensions
SPECIFICATIONS Dimensions Depth Shell Window Width In-wall Installation Carton Dimensions Minimum Minimum with Front Depth INCHES Finished Hole Inches Inches Extension Extension Inches to Louvers Max. Depth Width Into Room* Outside Height Inches Sleeve Inches Inches Inches * Inches Minimum** Maximum Height Width... -
Page 15: Electrical Data
SPECIFICATIONS Electrical Data WARNING NOTICE ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. FIRE HAZARD All electrical connections and wiring MUST be electrically unsafe conditions which could cause moderate the National Electrical Code and all local codes or serious property damage. -
Page 16: Electrical Data -Power Cord
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. -
Page 17: Operation
OPERATION Airflow Selection and Adjustment -Kuhl The airflow 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 airflow positioning. To adjust airflow 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. -
Page 18: Airflow Selection And Adjustment -Kuhl Q
OPERATION Airflow Selection and Adjustment -Kuhl Q The airflow 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 airflow positioning. To adjust airflow 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. -
Page 19: Airflow Selection And Adjustment -Wallmaster
OPERATION Airflow Selection and Adjustment -Wallmaster The airflow 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 airflow positioning. To adjust airflow direction left or right, 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. -
Page 20: User Interface-Kuhl
OPERATION User Interface-Kuhl All of the control panel function buttons and mode icons can be viewed in Figures 302 and 303. 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. -
Page 21: User Interface - Kuhl Q
OPERATION User Interface - Kuhl Q All of the control panel function buttons and mode icons can be viewed in Figure 305. 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. -
Page 22: User Interface- Wallmaster
OPERATION User Interface- Wallmaster All of the control panel function buttons and mode icons can be viewed in Figures 307. Power On – Press the button to turn on the air conditioner. The power button illuminates to indicate that the power is on. -
Page 23: User Interface - All Models
OPERATION User Interface - All Models Accessing Sub-Menus The MENU button accesses the sub-menu. Press the Menu Button to enter the Menu. See Figure 308. The arrow buttons navigate the 6 menu options. See Figure 309 – LIM – LOCK –... - Page 24 OPERATION User Interface - All Models Navigating Inside the Sub-Menus The MENU button moves you forward through the sub-menu. See Figure 311 The return button moves you backward once inside the LIM and TM menus. See Figure 312. Figure 311 MENU RETURN Figure 312 MENU RETURN...
- Page 25 OPERATION User Interface - All Models The LIM Menu (LIMIT) This is the limit menu. See Figure 313. Upon entering the menu, the first option will be to set the lower set-point limit using the arrow buttons. See Figure 314. Then you can set the higher set-point limit using the arrow buttons.
- Page 26 OPERATION User Interface - All Models The TM Menu (Timer) This is the TM menu used to set a timer. See Figure 317. In the menu, you set the current time using the arrow buttons. See Figure 318. (Note: These two “set clock” steps will be skipped if the unit is already connected to Wi-Fi.) First, set the hour.
- Page 27 OPERATION User Interface - All Models The TM Menu (Timer) continued Auto mode selected. See Figure 321. Set the cool set-point for your first timer period using the arrow buttons. The cooling mode timer only sets the cool set-point. See Figure 322.
- Page 28 OPERATION User Interface - All Models The TM Menu (Timer) continued Set the cool set-point for the second scheduled timer. See Figure 325. Set the heat set-point for the second timer. Set the time to start the second timer period. See Figure 326. Press the MENU button to complete the time timer setup.
- Page 29 OPERATION User Interface - All Models The F-C Menu (Fahrenheit/ Celsius) This menu is used to toggle between Fahrenheit and Celsius. See Figure 328. Using the arrow buttons on the right side switches it from Fahrenheit to Celsius. See Figures 329 and 330. Figure 328 MENU RETURN Figure 329...
- Page 30 OPERATION User Interface - All Models The Lock Menu This menu is used to lock the settings with a four(4) digit passcode. This is the Lock Menu. See Figure 331. The menu lock default is off. Use the arrows to toggle between off and on. See Figure 332. This is LOCK on.
- Page 31 OPERATION User Interface - All Models The Lock Menu continued The ON on the right side of the display shows the lock function is active. To go back into the menu, select the menu button again. See Figure 335. Enter the password in the same manner it was created. See Figure 336. Entering the correct password will give the user access to all of the sub-menus.
- Page 32 OPERATION User Interface The diAG Menu This menu is used to access the diagnostic codes. See Figure 339. Selecting this sub-menu shows the E that represents “Error.” See Figure 340. Toggle through the error codes using the arrow keys. See Figure 341. Figure 339 MENU RETURN Figure 340...
- Page 33 OPERATION User Interface The CnCT Menu (WiFi Connection) This menu is used to turn on Wi-Fi connection. This is the CnCT menu. Pressing the menu button will activate Wi-Fi. See Figure 342. To setup WiFi, refer to Wi-Fi setup instructions. The Wi-Fi symbol in the top right corner of the display shows Wi-Fi connection is on.
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Page 34: Control Panel
OPERATION Control Panel SYSTEM - The MODE button allows you to sequentially select up to four modes of operation: AUTO Available on select models COOL HEAT Available on select models FAN ONLY AUTO FAN (No Cooling Demand) When in AUTO mode, the fan only operates when the system has a demand to cool or heat the room. In the ON fan mode, the fan operates all the time. -
Page 35: Remote Control
OPERATION Remote Control Remote Control - Refer to Figure 344 during operation description. Getting Started - Install two (2) AAA batteries in the battery compartment located on the back of the unit. Operation - The remote control should be within 25 feet of the air conditioner for operation (refer to Figure 345 for effectiveness). -
Page 36: Unit
Noises Friedrich units are designed to operate as quietly as possible. An air conditioner mounted in a wall is quieter than one mounted in a window. It is important to ensure that the chassis seal gasket is properly installed (refer to SPECIFICATIONS FIGURE 205). -
Page 37: Unit Cooling Mode
OPERATION Unit Cooling Mode Once the indoor ambient temperature rises past the cool demand threshold (Cool Set Point + 1.5 ˚F) (see figure below), and the compressor is not locked out, the cooling cycle begins. As shown in the figure below, the fan is started 5 seconds prior to the compressor. -
Page 38: Unit Heat Control Operation - Heat Pump Only Unit
OPERATION Unit Heat Control Operation - Heat Pump Only Unit Once the ambient temperature falls below the Heating Demand Threshold (1.5 ˚F Below the Heat Set Point Temperature), the heating cycle begins. The fan is turned on 5 seconds before. Once the ambient temperature has been raised to the Heat Satisfied Point (Set point + .25 ˚F), the compressor is turned off. - Page 39 OPERATION Heating Fan Delay This is only for fan Mode Auto (Fan cycles with cool/heat operation) and not for continuous fan mode. When unit cycles Heating ON – starts the fan 5 seconds EARLY. When unit cycles Heating OFF – DELAYS the fan off for 15 seconds. Fan Speed Change Delay Relay activation is delayed by a minimum number of seconds.
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Page 40: General Knowledge Sequence Of Refrigeration
OPERATION General Knowledge Sequence Of Refrigeration A good understanding of the basic operation of the refrigeration system is essential for the service technician. Without this understanding, accurate troubleshooting of refrigeration system problems will be more difficult and time consuming, if not (in some cases) entirely impossible. The refrigeration system uses four basic principles (laws) in its operation they are as follows: 1. -
Page 41: Routine Maintenance
ROUTINE MAINTENANCE Remove and Install Front Cover -Kuhl WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. Remove the decorative front cover. 1. Using a 1/4” nut driver loosen the four (4) captive screws as shown in figure 401 Figure 401 (Remove and Install the Front Cover) Install the decorative front cover. -
Page 42: Routine Maintenance
ROUTINE MAINTENANCE Remove and Install Front Cover -Kuhl Q Remove the decorative front cover. WARNING 1. Remove screws if installed. EntryGard™ 2. Open the decorative front cover door. ELECTRIC SHOCK HAZARD 3. Locate and disconnect electronic control power Disconnect power to the unit before cable harness. -
Page 43: Routine Maintenance
ROUTINE MAINTENANCE Remove and Install Front Cover -Wallmaster WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. Remove the decorative front cover. 1. Remove the FRONT PANEL. Using the handles, pull panel out until it is released from the two retaining snaps. Place the cover aside carefully. - Page 44 ROUTINE MAINTENANCE Coils & Chassis NOTE: Do not use a caustic (alkaline) or acidic cleaning agent on coils or base pan. Use a biodegradable cleaning agent and de greaser. The use of harsh cleaning materials may lead to deterioration of the aluminum fins or the coil end plates. The indoor coil and outdoor coils and base pan should be inspected periodically (annually or semi-annually) and cleaned of all debris (lint, dirt, leaves, paper, etc.) as necessary.
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Page 45: Standard Filter Removal / Installation Instructions - Kuhl
ROUTINE MAINTENANCE Standard Filter Removal / Installation Instructions - Kuhl 1. Swing the door open, See Figure 404, and remove the filter by grasping the filter grip and pushing the filter holder upward and outward. See Figure 405. 2. Slide the filter grip out from the filter as shown in Figure 406. NOTE: Make sure the front frame with the mesh filter is facing you. -
Page 46: Premium Carbon Filter Removal / Installation Instructions -Kuhl
ROUTINE MAINTENANCE Premium Carbon Filter Removal / Installation Instructions -Kuhl 1. Remove the filter per Standard Filter Removal Installation Refer to Figure 404 and 405. 2. Hold the filter at the top and slide the grip out as shown on Figure 406. 3. -
Page 47: Filter Removal / Installation Instructions - Kuhl Q
ROUTINE MAINTENANCE Filter Removal / Installation Instructions - Kuhl Q Swing the door open, See Figure 410,and remove the filter by grasping the filter grips and pulling the bottom towards you. . See Figure 411. Clean the front frame by removing the carbon filter (if installed) and washing the dirt from the filter. Use a mild soap solution if necessary. Allow filter to dry. NOTE: The carbon filter is not a reusable filter, and needs to be replaced every three months for optimum efficiency. -
Page 48: Remove And Install The Chassis
REMOVE AND INSTALL THE CHASSIS Remove The Chassis - Kuhl CAUTION Do not push, pull, Use Handle or lift from Locations center of support (both sides) WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. -
Page 49: Install The Chassis -Kuhl
REMOVE AND INSTALL THE CHASSIS Install The Chassis -Kuhl CAUTION Do not push, pull, Use Handle or lift from Locations center of support (both sides) 1. Carefully team lift the chassis and set it into the cabinet. 2. Slide the chassis stopping approximately 3” from full insertion. 3. -
Page 50: Kuhl Q
REMOVE AND INSTALL THE CHASSIS Kuhl Q WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. Remove the chassis 1. Remove the EntryGard™ Screws. (Refer to Figure 504) 2. -
Page 51: Wallmaster
8. Check that filter is properly installed, and reinstall front panel. WEATHER PANEL. Reverse grille. Place lower edge into sleeve tab (Friedrich logo facing out). Align slots with the screw holes. Secure grille with screws. A. Check the anchor screw. There should be four (4) in the WSE SLEEVE (two in each side). -
Page 52: Troubleshooting
IS THE FRESH / EXHAUST AIR VENT OPEN? _____ ____ AREA TO BE APPROXIMATE IS A FRIEDRICH SLEEVE INSTALLED? _____ ____ CONDITIONED COOLING BTU IS A FRIEDRICH OUTDOOR GRILLE INSTALLED? _____ ____ IN SQ. FT. REQUIRED IS MAINTENANCE BEING PERFORMED? _____ ____ 100 - 150 5000... -
Page 53: Diagnostic Codes
TROUBLESHOOTING Diagnostic Codes DIAG PROBLEM CONTROL BOARD'S ACTION CODE Front Panel Button Stuck For More Continue to monitor for "OPEN" (Unstuck) switch. Do not process switch Than 20 Seconds input. ENSURE FRONT COVER DOES NOT DEPRESS BUTTONS Indoor Temperature Sensor is Open Set temp to 75°F in COOLING or 68°F in HEATING. -
Page 54: Troubleshooting Tips
TROUBLESHOOTING Troubleshooting Tips Problem Possible Cause Possible Solution The power button is off or the set point tem- Push the power button on and raise or lower temperature setting (as perature is satisfied. appropriate) to call for operation. Plug into a properly grounded 3 prong receptacle. (See Electrical Rating The LCDI power cord is unplugged. - Page 55 TROUBLESHOOTING Tips continued COMPLAINT CAUSE SOLUTION Operating in Cooling mode while the Do not try to operate your air conditioner in the cooling mode outside temperature is below 60 °F when the outside temperature is below 60 °F (16 °C). The unit (16 °C).
- Page 56 TROUBLESHOOTING COMPLAINT CAUSE SOLUTION Inoperative system button Test button & replace user interface if inoperative Broken, loose or incorrect wiring Refer to applicable wiring diagram Open capacitor Test capacitor & replace if inoperative Fan motor does not run. Fan speed button defective Replace user interface if inoperative Test fan motor &...
- Page 57 TROUBLESHOOTING Tips continued COMPLAINT CAUSE SOLUTION Compressor relay contacts stuck Replace electronic control board Incorrect wiring Refer to appropriate wiring diagrams Electronic control board does not turn unit off Unit undersized for area to be cooled Refer to industry standard sizing chart Defective thermistor Replace thermistor or electronic control board Incorrect wiring...
- Page 58 TROUBLESHOOTING COMPLAINT CAUSE SOLUTION Sublimation: Ensure that foam gaskets are installed in between window When unconditioned saturated, panes & in between the unit & the sleeve. Also, ensure that outside air mixes with conditioned fresh air, condensation forms on the cooler air/exhaust vents (on applicable models) are in the closed surfaces position &...
- Page 59 TROUBLESHOOTING Cool with Heat Units COMPLAINT CAUSE SOLUTION Check diagnostic codes. Check Thermistors. Replace as Bad indoor ambient thermistor Room temperature uneven needed. (Heating cycle) Fan speed too low Set at higher fan speed. Check if operating properly. Instruct customer on proper use Exhaust or fresh air door open of control Dirty filter...
- Page 60 TROUBLESHOOTING HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE Outdoor Ambient Too Outdoor Ambient Too Refrigerant System Low Airflow Across High For Operation In High for Operation in Restriction Outdoor Coil...
- Page 61 TROUBLESHOOTING AIR CONDITIONERS: TROUBLE SHOOTING TIPS REFRIGERANT SYSTEM DIAGNOSIS – COOLING CYCLE LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE Low Load Condi�ons High Load Conditions Low Load Condi�ons High Load Conditions Low Air Flow Across High Air Flow Across Refrigerant System Low Airflow Across...
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Page 62: Component Testing
COMPONENT TESTING Capillary Tube and Check Valve Assy (Heat Pump Units) WARNING WARNING BURN HAZARD CUT/SEVER HAZARD Proper safety procedures must be followed, Be careful with the sharp edges and corners. and proper protective clothing must be worn when working with a torch. Wear protective clothing and gloves, etc. -
Page 63: Capillary Tube Assy (Cool Only Units)
COMPONENT TESTING Capillary Tube Assy (Cool Only Units) Test the Capillary Tube and Check Valve Assy 1. Check the capillary tube temperature by hand where the refrigerant enters the capillary tube. A partial restriction of the capillary tube will be indicated by frost or freezing in that area. 2. -
Page 64: Reversing Valve Description And Operation
COMPONENT TESTING Reversing Valve Description And Operation The Reversing Valve controls the direction of refrigerant flow to the indoor and outdoor coils. It consists of a pressure-operated, main valve and a pilot valve actuated by a solenoid plunger. The solenoid is energized during the heating cycle only. The reversing valves used in the RAC system is a 2-position, 4-way valve. -
Page 65: Testing The Reversing Valve Solenoid Coil
COMPONENT TESTING Testing The Reversing Valve Solenoid Coil WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. The solenoid coil is an electromagnetic type coil mounted on the reversing valve and is energized during the operation of the compressor in the heating cycle. -
Page 66: Checking The Reversing Valve
COMPONENT TESTING Checking The Reversing Valve WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure. Proper safety procedures must be followed, and PPE must be utilized when working with refrigerants. Failure to follow these procedures could result in serious injury or death. -
Page 67: Touch Test Chart : To Service Reversing Valves
COMPONENT TESTING Touch Test Chart : To Service Reversing Valves NORMAL FUNCTION OF VALVE NOTES: VALVE OPERATING * TEMPERATURE OF VALVE BODY CONDITION ** WARMER THAN VALVE BODY POSSIBLE CAUSES CORRECTIONS Cool Normal Cooling Cool *TVB as (2) as (1) Cool Normal Heating Cool... -
Page 68: Compressor Checks
COMPONENT TESTING Compressor Checks WARNING WARNING ELECTRIC SHOCK HAZARD BURN HAZARD Turn off electric power before service or installation. Proper safety procedures must be followed, All electrical connections and wiring MUST be and proper protective clothing must be worn when working with a torch. the National Electrical Code and all local codes which have jurisdiction. - Page 69 COMPONENT TESTING Compressor Checks WARNING WARNING HIGH PRESSURE HAZARD ELECTRIC SHOCK HAZARD Sealed Refrigeration System contains refrigerant Turn off electric power before service or and oil under high pressure. installation. Extreme care must be used, if it Proper safety procedures must be followed, becomes necessary to work on equipment with and PPE must be utilized power applied.
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Page 70: Fan Motor
COMPONENTS TESTING Fan Motor 7. Set multi meter to check for 115/230 vac. 8. Place black probe on N/L2 terminal. The Fan Motor installed in your Kuhl or Wallmaster unit is a dual shaft 9. Place red probe on speed relay. motor driving both the condenser fan and the indoor blower wheel. -
Page 71: Checking Capacitors
COMPONENTS TESTING Checking Capacitors WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied. Failure to do so could result in serious injury or death. -
Page 72: Thermistors Description
COMPONENTS TESTING WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied. Failure to do so could result in serious injury or death. -
Page 73: Test User Interface And Electronic Control Board
COMPONENTS TESTING Test User Interface and Electronic Control Board 5. If 24 VDC is present replace the User Interface and/ or the ribbon cable. If the User Interface does not turn on: 1. Make sure the unit has the proper voltage and that it is turned on. Check power at Terminals L1 and L2. -
Page 74: Replace The Electronic Control Board- Kuhl
COMPONENT TESTING Replace the Electronic Control Board- Kuhl WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied. Failure to do so could result in serious injury or death. -
Page 75: Replace The Electronic Control Board- Kuhl Q
COMPONENTS TESTING Replace the Electronic Control Board- Kuhl Q 6. Interchange wires from old circuit board to new circuit board WARNING 7. Remove the four (4) circuit Board pins using needle nose pliers or other suitable tool. ELECTRIC SHOCK HAZARD 7. -
Page 76: Replace The User Interface - Wallmaster
COMPONENT TESTING Replace the User Interface - Wallmaster WARNING Depress black Tabs ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied. Failure to do so could result in serious injury or death. -
Page 77: Replace The Electronic Control Board - Wallmaster
COMPONENT TESTING Replace the Electronic Control Board - Wallmaster WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied. Failure to do so could result in serious injury or death. -
Page 78: R-32 Sealed System Repair
R-32 SEALED SYSTEM REPAIR General Information WARNING: Electrical Shock Hazard Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician and conform to all codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death. - Page 79 R-32 SEALED SYSTEM REPAIR General Information Warning: No ignition sources: No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding space.
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Page 80: Required Equipment
R-32 SEALED SYSTEM REPAIR Required Equipment Refrigeration Gauges rated for A2L Refrigerants with temp scales for R-32 refrigerant. • Gauge Manifold (Right handed threads). • A2L compatible Vacuum Gauge capable of 300 microns or less. • • Nitrogen regulator for purging and testing, rated to 800 psi. (Capable of low psi flow) •... -
Page 81: Refrigerant Removal, Recovery, And Evacuation
R-32 SEALED SYSTEM REPAIR Refrigerant Removal, Recovery, and Evacuation NOTE: When accessing the refrigerant in the system to make repairs or for any other purpose, conventional procedures shall be used. However, for FLAMMABLE REFRIGERANTS (R-32 is classified in the A2L group for mildly flammable refrigerants) it is important that best practice is followed since flammability is a consideration. -
Page 82: Component Replacement/Brazing
R-32 SEALED SYSTEM REPAIR Component Replacement/Brazing Warning: • Ensure sufficient ventilation at the repair place. Warning: Presence of fire extinguisher. If any hot work is to be conducted on the refrigerating equipment or any associated parts, have a ABC class fire extinguisher available to hand. Warning: No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. -
Page 83: Refrigerant Charging
R-32 SEALED SYSTEM REPAIRS Refrigerant Charging WARNING: Electrical Shock Hazard Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician and conform to all codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death. WARNING: This Product uses R-32 Refrigerant Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. -
Page 84: Compressor Replacement
R-32 SEALED SYSTEM REPAIRS Compressor Replacement 1. Be certain to perform all necessary electrical and refrigeration tests to be sure the compressor is actually defective before replacing. 2. Recover all refrigerant from the system though the process tubes. Refer to Section of this Refrigerant Removal, Recovery, and Evacuation WARNING... -
Page 85: Compressor Replacement -Special Procedure In Case Of Compressor Burnout
R-32 SEALED SYSTEM REPAIRS Compressor Replacement -Special Procedure in Case of Compressor Burnout 1. Recover all refrigerant and oil from the system. Refer to Refrigerant Removal, Recovery, and Evacuation Section of this manual. WARNING 2. Cut and remove compressor and capillary tube from the system. HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant CAUTION: Seal all openings on the defective compressor... -
Page 86: Replace The Reversing Valve
R-32 SEALED SYSTEM REPAIR Replace The Reversing Valve WARNING WARNING HIGH PRESSURE HAZARD EXPLOSION HAZARD Sealed Refrigeration System contains refrigerant The use of nitrogen requires a pressure and oil under high pressure. regulator. Follow all safety procedures and wear protective safety clothing etc. Proper safety procedures must be followed, and PPE must be utilized Failure to follow proper safety procedures... -
Page 87: Wiring Diagrams
WIRING DIAGRAMS Figure 901 (KHS10B10A) - Page 88 WIRING DIAGRAMS Figure 902 (KCS12B10A, KCM24B30A))
- Page 89 WIRING DIAGRAMS Figure 903 (KCL28B30A)
- Page 90 WIRING DIAGRAMS Figure 904 (KCL36B30A)
- Page 91 WIRING DIAGRAMS Figure 905 (KCQ08B10A)
- Page 92 WIRING DIAGRAMS Figure 906 (WCT16B30A)
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Page 93: Interactive Parts Viewer
INTERACTIVE PARTS VIEWER All Friedrich Service Parts can be found on our online interactive parts viewer. Please click on the link below: Interactive Parts Viewer For Further Assistance contact Friedrich customer service at (1-800-541-6645). -
Page 94: Available Accessories
AVAILABLE ACCESSORIES Premium Carbon Filters Remove odors and VOCs (volatile organic compounds). Achieve up to a MERV 6 rating when used with standard filter. 3 pack Model Kit No. KCQ and KEQ KWCFQ KCS, KES and KHS KWCFS KCM, KEM and KHM KWCFM KCL, KEL and KHL KWCFL... -
Page 95: Appendix
APPENDIX Appendix 1 Thermistor Resistance Values (This Table Applies to All Thermistors) RESISTANCE TEMP RESISTENCE (K Ohms) TOLERANCE % CENTR 210.889 225.548 240.224 6.50 6.51 178.952 190.889 202.825 6.25 6.25 151.591 161.325 171.059 6.03 6.03 128.434 136.363 144.292 5.81 5.81 108.886 115.340 121.794... - Page 96 FRIEDRICH in your Room Air Condi- tioner fails because of a defect in workmanship or material within sixty months from date of purchase, FRIEDRICH will pay a labor allowance of $100 and parts necessary to repair the Sealed Refrigeration System;...
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Page 97: Friedrich Authorized Parts Depots
CUSTOMER SATISFACTION and QUALITY ASSURANCE Friedrich is a conscientious manufacturer, concerned about customer satisfaction, product quality, and controlling warranty costs. As an Authorized Service Provider you play a vital role in these areas. By adhering to the policies and procedures you provide us with vital information on each warranty repair you complete.