Service Manual 2007 Room Air Conditioners Tempe rature Cooler Warme r Cool Powe r Fan Fan Only Timer On/Off RAC-Svc-07 (4-07) Money Speed Saver ® Opera tion Start Stop Set Hr.
TABLE OF CONTENTS Introduction / Typical Unit Components....................................................................................................................................... 3 Warranty ....................................................................................................................................................................................... 4 Routine Maintenance .......................................................................................................
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. This manual will deal with subjects in a general nature. (i.e. all text will not pertain to all models).
Friedrich Air Conditioning Company P.O. Box 1540 San Antonio, TX 78295 210.357.4400 www.friedrich.com ROOM AIR CONDITIONERS LIMITED WARRANTY FIRST YEAR 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.
ROUTINE MAINTENANCE NOTE: Units are to be inspected and serviced by qualified service personnel only. Routine maintenance is required annually or semi-annually, depending upon annual usage. 1. Clean the unit air intake filter at least every 250 to 300 fan hours of operation or when the unit’s indicator light is on if so equipped. Clean the filters with a mild detergent in warm water and allow to dry thoroughly before reinstalling. 2.
UNIT IDENTIFICATION Model Number Code S S 08 L 1 0 A 8th Digit – Engineering 1st Digit – Function Major change 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 7th Digit – Options 0 = Straight Cool & Heat Pump Models 1 = 1 KW Heat Strip, Normal 3 = 3 KW Heat Strip, Normal 4 = 4 KW Heat Strip, Normal 5 = 5 KW Heat Strip, Normal 2nd Digit C = Casement Q = Q-Star S = Small Chassis M = Medium Chassis
Q-Chassis S-Chassis M-Chassis L-Chassis HazardGard XQ05L10A-B XQ06L10A-A XQ08L10A-A XQ10L10A-A XQ12L10A-A EQ08L11A-A YQ07L10A-A YQ07L10A-B SS08L10-C SS08L10-D SS10L10-C KS12L10-C SS12L10-D KS15L10-B SS14L10-C SS12L30-C SS12L30-D SH15L30-B SS16L30-C ES12L33-B ES12L33-C ES16L33-B YS09L10-D YS13L33-B YS13L33-C KM24L30-B YM18L34-B YM18L34-C EM18L34-B KM18L30-B SM18L30A-B SM18L30A-C SM21L30-C SM21L30-D EM24L35-B SM24L30-B SL28L30-C SL36L30A-C EL36L35A-C YL24L35-C YL24L35-D SH15L30-B SH20L30-B PERFORMANCE D
ELECTRICAL DATA Wire Size Use ONLY wiring size recommended for single outlet branch circuit. Fuse/Circuit Use ONLY type and size fuse or HACR Breaker circuit breaker indicated on unit’s rating plate. Proper current protection to the unit is the responsibility of the owner. ELECTRIC SHOCK HAZARD. Turn off electric power before service or installation.
FUNCTIONAL COMPONENT DEFINITIONS MECHANICAL COMPONENTS ELECTRICAL COMPONENTS cont’d 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. MoneySaver® switch When engaged, it sends the power supply to the fan motor through the thermostat, which allows for a cycle-fan operation.
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. Activate test mode by pressing at the same time the “MONEY SAVER” button and the “CHECK FILTER” button on QME models. LED for the Filter Alert will blink 1 bps while Test Mode is active.
REFRIGERATION SYSTEM SEQUENCE OF OPERATION 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. “Heat always flows from a warmer body to a cooler body.” 2.
EQUIPMENT REQUIRED 1. Voltmeter 2. Ammeter 3. Ohmmeter 4. E.P.A. Approved Refrigerant Recovery System. 5. Vacuum Pump (capable of 200 microns or less vacuum.) 6. Acetylene Welder 7. Electronic Halogen Leak Detector (G.E. Type H-6 or equivalent.) 8. Accurate refrigerant charge measuring device such as: a. Balance Scales - 1/2 oz. accuracy b. Charging Board - 1/2 oz. accuracy 9. High Pressure Gauge - (0 - 400 lbs.) 10. Low Pressure Gauge - (30 - 150 lbs.) 11.
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. Proper refrigerant charge is essential to proper unit operation.
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 undercharge of refrigerant, always suspect a leak. The leak must be repaired before charging the unit. To check for an undercharged system, turn the unit on, allow the compressor to run long enough to establish working pressures in the system (15 to 20 minutes).
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. Frost may continue on the suction line back to the compressor.
TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES RIGHT Pilot Capillary Tube 1 2 3 4 5 6 Cool Cool as (2) Hot as (1) *TVB TVB Cool Hot as (1) Cool as (2) *TVB TVB Hot Hot Tube to INSIDE COIL LEFT Pilot Capillary Tube Normal Heating Tube to OUTSIDE COIL Normal Cooling SUCTION TUBE to Compressor VALVE OPERATING CONDITION DISCHARGE TUBE from Compressor NORMAL FUNCTION OF VALVE NOTES: * TEMPERATURE OF VALVE BODY ** WARMER THAN VALVE BODY POSSIBLE CAUSES CORRECTIONS MALF
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Compressor does not run Possible Cause Low voltage Check voltage at compressor. 115V & 230V units will operate at 10% voltage variance T-stat not set cold enough or inoperative Set t-stat to coldest position. Test t-stat & replace if inoperative Compressor hums but cuts off on B10 overload Hard start compressor. Direct test compressor.
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Unit does not run Possible Cause Fuse blown or circuit tripped Replace fuse, reset breaker. If repeats, check fuse or breaker size. Check for shorts in unit wiring & components Power cord not plugged in Plug it in System switch in "OFF" position Set switch correctly Inoperative system switch Test for continuity in each switch position Loose or disconnected wiring at switch or other components Check wiring & connections.
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Compressor runs for short periods only. Cycles on overload Possible Cause Overload inoperative. Opens too soon Check operation of unit. Replace overload if system operation is satisfactory Compressor restarted before system pressures equalized Allow a minimum of 2 minutes to allow pressures to equalize before attempting to restart. Instruct customer of waiting period Low or fluctuating voltage Check voltage with unit operating.
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Possible Cause Sublimation: When unconditioned saturated, outside air mixes with conditioned air, condensation forms on the cooler surfaces Ensure that foam gaskets are installed in between window panes & in between the unit & the sleeve.
HEAT / COOL ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Possible Cause Heat anticipator (resistor) shorted (on applicable models) Room temperature uneven (Heating cycle) Disconnect power to unit. Remove resistor from t-stat bulb block. Plus in unit & allow to operate. Feel resistor for heat. If not heat, replace resistor Wide differential - partial loss of t-stat bulb charge Replace t-stat & check Refer to appropriate wiring diagram. Resistor is energized during "ON" cycle of compressor or fan.
HEAT / COOL ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Unit cools when heat is called for Possible Cause Incorrect wiring Refer to applicable wiring diagram Defective solenoid coil Check for continuity of coil Reversing valve fails to shift Block condenser coil & switch unit to cooling. Allow pressure to build up in system, then switch to heating. If valve fails to shift, replace valve.
TROUBLESHOOTING CHART — HEATING REFRIGERANT SYSTEM DIAGNOSIS – HEATING Low Suction Pressure High Suction Pressure Low Head Pressure High Head Pressure Low Airflow Across Outdoor Coil Outdoor Ambient Too High for Operation in Heating Refrigerant System Restriction Outdoor Ambient Too High For Operation In Heating Refrigerant System Restriction Reversing Valve not Fully Seated Reversing Valve not Fully Seated Low Airflow Across Indoor Coil Undercharged Overcharged Undercharged Overcharged Mois
MODELS XQ05L10-A,B; XQ06L10-A,B,C,D; XQ08L10-A,B; XQ10L10-A,B; XQ12L10-A,B 24
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 25
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 26
MODEL SL36L30-A 27
MODEL SL28L30-A 28
MODELS SL36L30-B 29
MODEL EQ08L11-A 30
MODELS ES12L33-A, ES16L33-A, EM18L34-A, EM24L35-A 31
MODEL EL36L35-A 32
MODEL YS09L10-A, YS09L10-B 33
MODELS YS13L33-A, YM18L34-A 34
MODELS YL24L35-A 35
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.