Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for Friedrich 2007
Summary of Contents for Friedrich 2007
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Page 1: Service Manual
Service Manual 2007 Room Air Conditioners RAC-Svc-07 (4-07) -
Page 2: Table Of Contents
If you install or perform service on equipment, you must assume responsibility for any bodily injury or property damage which may result to you or others. Friedrich Air Conditioning Company will not be responsible for any injury or property damage arising from improper installation, service, and/or service procedures. -
Page 3: Introduction / Typical Unit Components
INTRODUCTION This service manual is designed to be used in conjunction with the installation manuals provided with each air conditioning system component. This service manual was written to assist the professional RAC service technician to quickly and accurately diagnose and repair malfunctions. -
Page 4: Warranty
ANY PART: If any part supplied by FRIEDRICH fails because of a defect in workmanship or material within twelve months from date of original purchase, FRIEDRICH will repair the product at no charge, provided room air conditioner is reasonably accessible for service. -
Page 5: Routine Maintenance
NOTE: Units are to be inspected and serviced by qualifi ed service personnel only. Routine maintenance is required annually or semi-annually, depending upon annual usage. Clean the unit air intake fi lter at least every 250 to 300 fan hours of operation or when the unit’s indicator light is on if so equipped. -
Page 6: Unit Identifi Cation / Nomenclature
1st Digit – Function S = Straight Cool, Value Series Y = Heat Pump E = Electric Heat K = Straight Cool R = Straight Cool X = Straight Cool W = Thru-the Wall, WallMaster Series 2nd Digit C = Casement Q = Q-Star S = Small Chassis M = Medium Chassis... -
Page 7: Performance Data
PERFORMANCE DATA Q-Chassis S-Chassis M-Chassis L-Chassis HazardGard *Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity. -
Page 8: Electrical Data
The consumer - through the AHAM Room Air Conditioner Certifi cation Program - can be certain that the AHAM Certifi cation Seal accurately states the unit’s cooling and heating capacity rating, the amperes and the energy effi... -
Page 9: Functional Component Defi Nitions
FUNCTIONAL COMPONENT DEFINITIONS MECHANICAL COMPONENTS Bellows condensate valve Temperature-sensitive valve that opens up to drain off condensate water when the outside temperature falls below 40°F and closes when the outside temperature reaches 58°F. Vent door Allows introduction of fresh air into the room and/or exhausts stale room air outside (on select models.) Plenum assembly Diffuser with directional louvers used to direct the conditioned airfl... -
Page 10: Electronic Controls
ELECTRONIC CONTROLS TESTING THE ELECTRONIC CONTROL XQ/WS BOARDS & QME BOARDS Activating Test Mode: Activate test mode by pressing at the same time the “MODE” button and the temperature “DOWN” button on XQ & WS models. LEDs for Hour, Start, and Stop will blink 1 bps while Test Mode is active. -
Page 11: Refrigeration System Sequence Of Operation
REFRIGERATION SYSTEM SEQUENCE OF OPERATION A good understanding of the basic operation of the refrigera- tion system is essential for the service technician. Without this understanding, accurate troubleshooting of refrigeration system problems will be more diffi cult and time consuming, if not (in some cases) entirely impossible. -
Page 12: Hermetic Component Replacement
EQUIPMENT REQUIRED Voltmeter Ammeter Ohmmeter E.P.A. Approved Refrigerant Recovery System. Vacuum Pump (capable of 200 microns or less vacuum.) Acetylene Welder Electronic Halogen Leak Detector (G.E. Type H-6 or equivalent.) Accurate refrigerant charge measuring device such as: a. Balance Scales - 1/2 oz. accuracy b. -
Page 13: Refrigerant Charging
REFRIGERANT CHARGING NOTE: BECAUSE THE RAC SYSTEM IS A SEALED SYSTEM, SERVICE PROCESS TUBES WILL HAVE TO BE INSTALLED. FIRST INSTALL A LINE TAP AND REMOVE REFRIGERANT FROM SYSTEM. MAKE NECESSARY SEALED SYSTEM REPAIRS AND VACUUM SYSTEM. CRIMP PROCESS TUBE LINE AND SOLDER END SHUT. DO NOT LEAVE A SERVICE VALVE IN THE SEALED SYSTEM. - Page 14 REFRIGERANT CHARGING cont’d UNDERCHARGED REFRIGERANT SYSTEMS An undercharged system will result in poor performance (low pressures, etc.) in both the heating and cooling cycle. Whenever you service a unit with an under charge of refrigerant, always suspect a leak. The leak must be repaired before charging the unit.
- Page 15 REFRIGERANT CHARGING cont’d RESTRICTED REFRIGERANT SYSTEM A quick check for either condition begins at the evaporator. With a partial restriction, there may be gurgling sounds at the metering device entrance to the evaporator. The evaporator in a partial restriction could be partially frosted or have an ice ball close to the entrance of the metering device.
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Page 16: Troubleshooting
TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES VALVE OPERATING CONDITION Cool Normal Cooling Cool as (2) Normal Heating Cool as (1) Check Electrical circuit and coil Check refrigeration charge Cool Cool, Valve will not as (2) shift from cool to heat. - Page 17 COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Low voltage T-stat not set cold enough or inoperative Compressor hums but cuts off on B10 overload Compressor does not run Open or shorted compressor windings Open overload Open capacitor Inoperative system switch Broken, loose or incorrect wiring Problem Inoperative system switch...
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Page 18: Wiring Diagrams
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Fuse blown or circuit tripped Power cord not plugged in Unit does not run System switch in "OFF" position Inoperative system switch Loose or disconnected wiring at switch or other components Problem Dirty fi... - Page 19 Instruct customer of waiting period Check voltage with unit operating. Check for other appliances on circuit. Air conditioner should be in separate circuit for proper voltage & fused separately Refer to appropriate wiring diagram...
- Page 20 COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Sublimation: unconditioned saturated, outside air mixes with conditioned air, condensation forms on the cooler surfaces Water "spitting" into room Downward pitch of installation is too steep Restricted coil or dirty fi lter Problem Insuffi...
- Page 21 HEAT / COOL ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Heat anticipator (resistor) shorted (on applicable models) Room temperature uneven Wide differential - partial loss of t-stat bulb charge Replace t-stat & check (Heating cycle) Incorrect wiring Problem Incorrect wiring Defrost control timer motor not advancing (applicable models) Defrost control out of calibration (applicable models)
- Page 22 HEAT / COOL ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Incorrect wiring Defective solenoid coil Unit cools when heat is called for Reversing valve fails to shift Inoperative system switch Problem Heating capillary tube partially restricted Cooling adequate, Check valve leaking internally but heating insuffi...
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Page 23: Troubleshooting
TROUBLESHOOTING CHART — HEATING REFRIGERANT SYSTEM DIAGNOSIS – HEATING Low Suction Pressure High Suction Pressure Low Airfl ow Outdoor Ambient Too High Across Outdoor Coil for Operation in Heating Refrigerant System Reversing Valve not Restriction Undercharged Moisture in System Defective Compressor ELECTRICAL TROUBLESHOOTING CHART —... - Page 24 MODELS XQ05L10-A,B; XQ06L10-A,B,C,D; XQ08L10-A,B; XQ10L10-A,B; XQ12L10-A,B...
- Page 25 MODELS KS10L10-A, RS10L10-A, KS12L10-A, KS12L30-A, KS15L10-A, RS15L10-A, RS16L30-A, RM18L30-A, KM18L30-A, KM21L30-A, RM24L30-A, KM24L30-A...
- Page 26 MODELS SS08L10-A/B, SS10L10-A/B, SS12L10-A/B; SS12L30-A/B, SS14L10-A/B, SS16L30-A/B, SM18L30-A/B, SM21L30-A/B, SM24L30-A/B...
- Page 27 MODEL SL36L30-A...
- Page 28 MODEL SL28L30-A...
- Page 29 MODELS SL36L30-B...
- Page 30 MODEL EQ08L11-A...
- Page 31 MODELS ES12L33-A, ES16L33-A, EM18L34-A, EM24L35-A...
- Page 32 MODEL EL36L35-A...
- Page 33 MODEL YS09L10-A, YS09L10-B...
- Page 34 MODELS YS13L33-A, YM18L34-A...
- Page 35 MODELS YL24L35-A...
- Page 36 Friedrich Air Conditioning Co. Post Office Box 1540 • San Antonio, Texas 78295-1540 4200 N. Pan Am Expressway • San Antonio, Texas 78218-5212 (210) 357-4400 • FAX (210) 357-4480 www.friedrich.com Printed in the U.S.A. RAC-Svc-07 (4-07)