Friedrich Kuhl KCM21A30A Service Manual
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Friedrich Kuhl KCM21A30A Service Manual

Room air conditioners r-410a refrigerant
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Kuhl
Room Air Conditioners
R-410A Refrigerant
Standard Chassis Models
Kühl
Kühl +
Electric Heat
Kühl +
Heat Pump
93001403_05
1
Series
®
115-Volt:
KCS08A10A, KCS10A10A, KCS12A10A, KCS14A10A, KCM14A10A
230-Volt:
KCS12A30A, KCS16A30A, KCM18A30A, KCM21A30A KCL24A30A,
KCL24A30B, KCL28A30A, KCL36A30A
230-Volt:
KES12A33A, KES16A33A, KEM18A34A, KEL24A35A, KEL24A35B,
KEL24A35C, KEL36A35A
115-Volt:
230-Volt:
THE EXPERTS IN ROOM AIR CONDITIONING
KHS10A10A
KHM12A33A, KHM18A34A, KHL24A35A

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  • Page 1 Kuhl Series ® Room Air Conditioners R-410A Refrigerant Standard Chassis Models Kühl 115-Volt: KCS08A10A, KCS10A10A, KCS12A10A, KCS14A10A, KCM14A10A 230-Volt: KCS12A30A, KCS16A30A, KCM18A30A, KCM21A30A KCL24A30A, KCL24A30B, KCL28A30A, KCL36A30A Kühl + 230-Volt: KES12A33A, KES16A33A, KEM18A34A, KEL24A35A, KEL24A35B, KEL24A35C, KEL36A35A Electric Heat Kühl + 115-Volt: KHS10A10A KHM12A33A, KHM18A34A, KHL24A35A...

  • Page 2: Table Of Contents

    Table of Contents INTRODUCTION Important Safety Information Personal Injury Or Death Hazards New Kühl Control Options Component Identification Model and Serial Number Location Model Number Reference Guide Serial Number Reference Guide SPECIFICATIONS Refrigeration Systems Performance Data Installation Electrical Data OPERATION Airflow Selection and Adjustment User Interface Control Panel...

  • Page 3: Introduction

    INTRODUCTION Important Safety Information The information in this manual is intended for use by a qualified 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.

  • Page 4: 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 5 INTRODUCTION PERSONAL INJURY OR DEATH HAZARDS • 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.

  • Page 6: New Kühl Control Options

    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. www.friedrich.com for complete details on Friedrich Connect.

  • Page 7: Component Identification

    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. Component Identification Compressor...

  • Page 8: Model Number Reference Guide

    INTRODUCTION Model Number Reference Guide K C M 21 A 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 9: Serial Number Reference Guide

    19 = 2019 20 = 2020 21 = 2021 22 = 2022 MONTH OF MANUFACTURE 01 = JANUARY FACTORY DESIGNATION 02 = FEBRUARY M = FRIEDRICH MTY 03 = MARCH 04 = APRIL 05 = MAY 06 = JUNE 07 = JULY...

  • Page 10: Specifications

    SPECIFICATIONS Refrigeration Systems Performance Data R-410A Electrical Ratings REF. Breaker Condensor Discharge Suction LOCKED Temp Temp Temp AMPS AMPS ROTOR CHARGE HERTZ Model Deg F. Deg. F Deg F COOL HEAT AMPS IN OZ Voltage AMPS Kühl (Cool Only) ® KCS08A10A 30.5 24.5...
  • Page 11 * KHS10A10A heat pump operates on 115 volt and is not equipped with supplemental heat. Will not provide heat at tem- peratures below 40˚F. Friedrich room air conditioners are designed to operate in cooling mode with outdoor temperatures from 60˚F to 115˚F. Figure 202 (Specifications)

  • Page 12: Installation

    SPECIFICATIONS Installation 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 13: 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 electically unsafe conditions which could cause moderate the National Electrical Code and all local codes or serious property damage.
  • Page 14 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.

  • Page 15: Operation

    OPERATION Airflow Selection and Adjustment 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 16: User Interface

    OPERATION User Interface 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 17 OPERATION User Interface Accessing Sub-Menus The MENU button accesses the sub-menu. See Figure 10. Press the Menu Button to enter the Menu. See Figure 304. The arrow buttons navigate the 6 menu options. See Figure 305. – LIM – LOCK –...
  • Page 18 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...
  • Page 19 OPERATION User Interface The LIM Menu (LIMIT) This is the limit menu. See Figure 309. Upon entering the menu, the first 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.
  • Page 20 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.
  • Page 21 OPERATION User Interface The TM Menu (Timer) continued Auto mode selected. See Figure 317. Set the cool setpoint for your first 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 first 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.
  • Page 22 OPERATION User Interface The TM Menu (Timer) continued Set the cool setpoint for the second scheduled timer. See Figure 321. Set the heat setpoint for the second timer. Set the time to start the second timer period. See Figure 322. Press the MENU button to complete the time timer setup.
  • Page 23 OPERATION User Interface The F-C Menu (Fahrenheit/ Celsius) This menu is used to toggle between Fahrenheit and Celsius. See Figure 324. Using the arrow buttons on the right side switches it from Fahrenheit to Celsius. See Figures 325 and 326. Figure 324 MENU RETURN Figure 325...
  • Page 24 OPERATION User Interface The Lock Menu This menu is used to lock the settings with a four(4) digit passcode. This is the Lock Menu. See Figure 327. The menu lock is defaulted to off. Use the arrows to toggle between off and on. See Figure 328. This is LOCK on.
  • Page 25 OPERATION User Interface 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 331. Enter the password in the same manner it was created. See Figure 332. Entering the correct password will give the user access to all of the sub-menus.
  • Page 26 OPERATION User Interface The diAG Menu This menu is used to access the diagnostic codes. See Figure 337. Selecting this sub-menu shows the E that represents “Error.” See Figure 338. Toggle through the error codes using the arrow keys. See Figure 339. Figure 337 MENU RETURN Figure 338...
  • Page 27 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 335. 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.

  • Page 28: 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 29: Remote Control

    OPERATION Remote Control Remote Control - Refer to Figure 340A 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 340B for effectiveness). Press the power button to turn the remote on.

  • Page 30: 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 31 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 32 OPERATION Unit Heat Control Operation - Heat Pump Only Unit (KHS10A10 has no electric heat back-up) 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 33 OPERATION Unit Heat Control Operation - HeatPump With Electric Heat This heating is more complex due to the possibility of two heating methods. If the ambient indoor temperature is below the heat demand threshold (1.5˚F below the heat set point temperature), and the compressor is not locked out, turn on compressor.
  • Page 34 OPERATION Unit Heat Control Operation - Heat Pump With Electric Heat (Continued) Automatic Emergency Heat If the sealed system fails with a bad reversing valve or anything that causes the indoor coil to get colder than the indoor ambient temperature: 1) If the indoor coil thermistor senses a 5 degree temperature drop as compared to the ambient temperature thermistor and this lasts up to 5 minutes, the control board will switch the unit to electric heat and continue heating with it.
  • Page 35 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.

  • Page 36: 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.

  • Page 37: Routine Maintenance

    ROUTINE MAINTENANCE Remove And Install The Front Cover 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 the tool provided (see figure below), loosen the four (4) captive screws as shown in figure 401 Location of the Grill Removal Tool Figure 401 (Remove and Install the Front Cover)
  • Page 38 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 degreaser. The use of harsh cleaning materials may lead to deterioration of the aluminum fins or the coil end plates.

  • Page 39: Standard Filter Removal / Installation Instructions

    ROUTINE MAINTENANCE Standard Filter Removal / Installation Instructions Swing the door open, See Figure 402, and remove the filter by grasping the filter grip and pushing the filter holder upward and outward. See Figure 403. Slide the filter grip out from the filter as shown in Figure 404. NOTE: Make sure the front frame with the mesh filter is facing you.
  • Page 40 ROUTINE MAINTENANCE Premium Carbon Filter Removal / Installation Instructions Remove the filter per Standard Filter Removal Installation Refer to Figure 402 and 403. Hold the filter at the top and slide the grip out as shown on Figure 405. If you already have a carbon filter installed remove the dirty filter by laying the filter down and swinging open the front frame as shown in Figure 406.

  • Page 41: Remove And Install The Chassis

    REMOVE AND INSTALL THE CHASSIS Remove The Chassis 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 42 REMOVE AND INSTALL THE CHASSIS Install The Chassis 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 43: 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 44: 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 Than 20 Seconds switch 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 45: Troubleshooting Tips

    TROUBLESHOOTING Troubleshooting Tips Problem Possible Cause Possible Solution Push the power button on and raise or lower The power button is off or the set point tem- temperature setting (as appropriate) to call for perature is satisfied. operation. Plug into a properly grounded 3 prong receptacle. The LCDI power cord is unplugged.
  • Page 46 TROUBLESHOOTING Tips continued COMPLAINT CAUSE SOLUTION Do not try to operate your air conditioner in the Operating in Cooling mode while the cooling mode when the outside temperature is outside temperature is below 60 °F below 60 °F (16 °C). The unit will not cool prop- (16 °C).
  • Page 47 TROUBLESHOOTING COMPLAINT CAUSE SOLUTION Test button & replace user interface if inopera- Inoperative system button tive Broken, loose or incorrect wiring Refer to applicable wiring diagram Fan motor does not run. Open capacitor Test capacitor & replace if inoperative Fan speed button defective Replace user interface if inoperative Test fan motor &...
  • Page 48 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 49 TROUBLESHOOTING COMPLAINT CAUSE SOLUTION Ensure that foam gaskets are installed in Sublimation: between window panes & in between the unit & When unconditioned saturated, outside the sleeve. Also, ensure that fresh air mixes with conditioned air, conden- air/exhaust vents (on applicable models) are in sation forms on the cooler surfaces the closed position &...
  • Page 50 TROUBLESHOOTING Cool with Heat Units COMPLAINT CAUSE SOLUTION Check diagnostic codes. Check Thermistors. Bad indoor ambient thermistor Room temperature uneven Replace as needed. (Heating cycle) Fan speed too low Set at higher fan speed. Check if operating properly. Instruct customer Exhaust or fresh air door open on proper use of control Dirty filter...
  • Page 51 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 52 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 High Load Conditions Low Load Condi�ons Low Air Flow Across High Air Flow Across Refrigerant System Low Airflow Across...

  • Page 53: 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 54: 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 55: 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.

  • Page 56: 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 57: 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 proper protective clothing must be worn when working with refrigerants. Failure to follow these procedures could result in serious injury or death.

  • Page 58: 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 59: 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 60 COMPONENT TESTING 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 proper protective clothing must be worn power applied.

  • Page 61: Fan Motor

    COMPONENTS TESTING Fan Motor A single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan. A self- resetting overload is located inside the motor to protect against high temperature and high amperage conditions. (See Figure 23) Figure 23 WARNING Blower/Fan Motor...

  • Page 62: Heating Element

    COMPONENTS TESTING Heating Element WARNING Heating Element Example 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 63: Testing The User Interface And Electronic Control Board

    COMPONENTS TESTING Testing the User Interface and Electronic WARNING Control Board ELECTRIC SHOCK HAZARD If the User Interface does not turn on: Turn off electric power before service or 1. Make sure the unit has the proper voltage and that it is installation.

  • Page 64: Electronic Control Board Identification

    COMPONENTS TESTING Electronic Control Board Identification USER INTERFACE AMB TEMP SENSOR ID COIL TEMP SENSOR OD COIL TEMP SENSOR DISCH AIR TEMP SENSOR HIGH PRESSURE SWITCH/JUMPER Reversing L2 / RV2 Valve Relay FAN 1 LOW SPEED RELAY L2 / RV2 FAN 2 RELAY HEATER...

  • Page 65: Replace The Electronic Control Board

    COMPONENT TESTING Replace the Electronic Control Board 1. Unplug the unit 2. Remove the Front Cover. Refer to Routine Maintenance, Figure 401. 3. Remove three (3) screws from Control Box Panel . 4. If necessary, cut wire ties and remove one(1) CIRCUIT BOARD PIN X4 screw from electronic holder to create slack in wiring.

  • Page 66: R-410A Sealed System Repair

    11. Introduce liquid refrigerant charge into the high side of the system. 12. For low side pressure charging of R-410A, use a charging adaptor. 13. Use Friedrich approved R-410A filter dryers only. NOTE: SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

  • Page 67: Refrigerant Charging

    R-410A SEALED SYSTEM REPAIRS Refrigerant Charging WARNING WARNING HIGH PRESSURE HAZARD RISK OF ELECTRIC SHOCK Sealed Refrigeration System contains refrigerant Unplug and/or disconnect all electrical power and oil under high pressure. to the unit before performing inspections, maintenances or service. Proper safety procedures must be followed, and proper protective clothing must be worn Failure to do so could result in electric shock,...

  • Page 68: Undercharged Refrigerant Systems

    R-410A SEALED SYSTEM REPAIRS Undercharged Refrigerant Systems NOTE: Ensure fan is on high speed during testing. WARNING An undercharged system will result in poor performance (low pressures, etc.) in both the heating RISK OF ELECTRIC SHOCK and cooling cycle. Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenances or service.

  • Page 69: Overcharged Refrigerant Systems

    R-410A SEALED SYSTEM REPAIRS Overcharged Refrigerant Systems WARNING NOTE: Ensure fan is on high speed during testing. RISK OF ELECTRIC SHOCK Compressor amps will be near normal or higher. Unplug and/or disconnect all electrical power to the unit before performing inspections, Noncondensables can also cause these symptoms.

  • Page 70: Restricted Refrigerant System

    R-410A SEALED SYSTEM REPAIRS Restricted Refrigerant System NOTE: Ensure fan is on high speed during testing. Troubleshooting a restricted refrigerant system can be difficult. The following procedures are the more common problems and solu- tions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions. A partial restriction allows some of the refrigerant to circulate through the system.

  • Page 71: Sealed System Method Of Charging/ Repairs

    R-410A SEALED SYSTEM REPAIRS Sealed System Method of Charging/ Repairs CAUTION WARNING FREEZE HAZARD BURN HAZARD Proper safety procedures must be followed, Proper safety procedures must be followed, and proper protective clothing must be worn and proper protective clothing must be worn when working with liquid refrigerant.

  • Page 72: Compressor Replacement

    R-410A 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 WARNING replacing. 2. Recover all refrigerant from the system though the process ELECTRIC SHOCK HAZARD tubes.
  • Page 73 R-410A SEALED SYSTEM REPAIRS Compressor Replacement -Special Procedure in Case of Compressor Burnout 1. Recover all refrigerant and oil from the system. 2. Remove compressor, capillary tube and filter drier from the WARNING system. HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant 3.

  • Page 74: Replace The Reversing Valve

    R-410A SEALED SYSTEM REPAIRS Replace The Reversing Valve WARNING NOTICE FIRE HAZARD HIGH PRESSURE HAZARD The use of a torch requires extreme care and proper Sealed Refrigeration System contains refrigerant judgment. Follow all safety recommended precautions and and oil under high pressure. Proper safety procedures must be followed, notice could result in moderate to serious property damage.

  • Page 75: Wiring Diagrams

    WIRING DIAGRAMS Figure 801 (Wiring Diagrams)
  • Page 76 WIRING DIAGRAMS Figure 802 (Wiring Diagrams)
  • Page 77 WIRING DIAGRAMS Figure 803 (Wiring Diagrams)
  • Page 78 WIRING DIAGRAMS WIRING DIAGRAM ELECTRONIC CONTROL AMB TE MP S ENSOR ID COIL TE MP S ENSOR COMPRESSOR OD COIL TEMP SE NSOR DIS CH TEMP SE NSOR TO CHASSIS IF APPLICABLE RELAY BLUE RELAY BLACK RELAY LINE_L2 BLACK COMP RELAY LCDI POWER SUPPLY...
  • Page 79 WIRING DIAGRAMS Figure 804 (Wiring Diagrams)
  • Page 80 WIRING DIAGRAMS Figure 805 (Wiring Diagrams)
  • Page 81 WIRING DIAGRAMS Figure 806 (Wiring Diagrams)
  • Page 82 WIRING DIAGRAMS Figure 807 (Wiring Diagrams)
  • Page 83 WIRING DIAGRAMS Figure 808 (Wiring Diagrams)
  • Page 84 WIRING DIAGRAMS Figure 809 (Wiring Diagrams)
  • Page 85 WIRING DIAGRAMS Figure 810 (Wiring Diagrams)

  • Page 86: 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 Assistence contact Friedrich customer service at (1-800-541-6645).

  • Page 87: 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. KWCFQ KCQ and KEQ KCS, KES and KHS KWCFS KCM, KEM and KHM KWCFM KCL, KEL and KHL KWCFL...

  • Page 88: Appendix

    APPENDIX Appendix 1 Thermistor Resistence 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 89 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;...
  • Page 90 THIS PAGE LEFT INTENTIONALLY BLANK.
  • Page 91 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. This information is used to identify product failure trends, initiate corrective action, and improve product quality, thereby further reducing warranty expenses while increasing customer satisfaction levels.

This manual is also suitable for:

Kuhl kcs08a10aKuhl kcs10a10aKuhl kcs12a10aKuhl kcs14a10aKuhl kcm14a10aKuhl kcs12a30a ... Show all

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