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Service Manual
2006
Room Air Conditioners
RAC-Svc-06 (3-06)
Exhaust
PM
SUPER HIGH EFFICIENCY
P Oo n/w Oe ffr
Cool
Fan ®
Speed Mode MoneySaver
Fan Only
Clock
Timer Set Start
On/Off Hour
Stop
Temp/Hour Vent shut
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TABLE OF CONTENTS INTRODUCTION This service manual is designed to be used in conjunction with Warranty ............................................................................. 3 the installation manuals provided with each air conditioning system component. Routine Maintenance ......................................................... 4 This service manual was written to assist the professional Unit Identifi cation / Nomenclature ......................................5 RAC service technic
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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. Any additional labor cost for removing inaccessible units and/or charges fo
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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. 1. 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. Clean the fi lters with a mild detergent in warm water and allow to dry thoroughly before reinstalling. 2. The indoor coil (evaporator coil), the outdoor coil (conden
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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 7th Digit – Options R = Straight Cool 0 = Straight Cool & X = Straight Cool Heat Pump Models W = Thru-the Wall, 1 = 1 KW Heat Strip, Normal WallMaster Series 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 6th Digit – Vol
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PERFORMANCE DATA OPERATING R-22 BREAKER EVAPORATOR CONDENSER DISCHARGE SUCTION SUPER SUB- ELECTRICAL RATINGS PRESSURES REF. FUSE AIR TEMP °F TEMP °F TEMP TEMP HEAT COOLING Voltage Model Locked Temp Amps Amps Rotor Charge Discharge 60 Hertz Air Drop °F Suction Discharge Cool Heat Amps in OZ. Amps Q-Chassis XQ05L10-A 54 27 120 150 68 17 19 85 256 4.8 – 28.0 18.3 115 15 XQ06L10-A 55 26 121 157 65 13 27 87 261 5.0 – 24.0 21.0 115 15 XQ08L10-A 52 29 128 167 60 13 33 81 283 6.8 – 36.2 22.1 115 15
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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 ELECTRIC SHOCK HAZARD. is the responsibility of the owner. Turn off electric power before service or installation. Grounding Unit MUST be grounded from branch All electrical connections and wiring MUST be circuit through service cord to unit, or installe
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FUNCTIONAL COMPONENT DEFINITIONS MECHANICAL COMPONENTS ELECTRICAL COMPONENTS cont’d ® Bellows condensate valve Temperature-sensitive valve MoneySaver switch When engaged, it sends the power that opens up to drain off condensate water when the outside supply to the fan motor through the thermostat, which allows temperature falls below 40°F and closes when the outside for a cycle-fan operation. temperature reaches 58°F. Fan Motor Dual-shafted fan motor operates the indoor Vent door Allows i
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ELECTRONIC CONTROLS TESTING THE ELECTRONIC CONTROL TESTING THE ELECTRONIC CONTROL XQ/WS BOARDS & QME BOARDS ERROR CODE LISTINGS Activating Test Mode: Activate test mode by pressing at E1 SHORT CYCLE SITUATION: Keyboard is fine. the same time the “MODE” button and the temperature Investigate and defi ne short cycling problem. “DOWN” button on XQ & WS models. LEDs for Hour, Start, E2 KEYBOARD STUCK ERROR: If key button(s) are and Stop will blink 1 bps while Test Mode is active. pressed conti
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REFRIGERATION SYSTEM SEQUENCE OF OPERATION A good understanding of the basic operation of the refrigera- the liquid refrigerant leaves the metering device entering tion system is essential for the service technician. Without the evaporator coil. As it enters the evaporator coil, the this understanding, accurate troubleshooting of refrigeration larger area and lower pressure allows the refrigerant to system problems will be more diffi cult and time consuming, expand and lower its temperature (h
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EQUIPMENT REQUIRED H ERMETIC COMPONENT REPLACEMENT cont’d 1. Voltmeter 6. Pressurize system to 30 PSIG with proper refrigerant and boost refrigerant pressure to 150 PSIG with dry nitrogen. 2. Ammeter 7. Leak test complete system with electric halogen leak 3. Ohmmeter detector, correcting any leaks found. 4. E.P.A. Approved Refrigerant Recovery System. 8. Reduce the system to zero gauge pressure. 5. Vacuum Pump (capable of 200 microns or less vacuum.) 9. Connect vacuum pump to high sid
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REFRIGERANT CHARGING NOTE: BECAUSE THE RAC SYSTEM IS A SEALED compressor motor. When this occurs, the motor winding SYSTEM, SERVICE PROCESS TUBES WILL HAVE TO BE temperature will increase causing the motor to overheat INSTALLED. FIRST INSTALL A LINE TAP AND REMOVE and possibly cycle open the compressor overload protector. REFRIGERANT FROM SYSTEM. MAKE NECESSARY Continued overheating of the motor windings and/or cycling SEALED SYSTEM REPAIRS AND VACUUM SYSTEM. of the overload will eventually
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REFRIGERANT CHARGING cont’d UNDERCHARGED REFRIGERANT SYSTEMS An undercharged system will result in poor performance (low Intermittent frosting and thawing of the evaporator is another pressures, etc.) in both the heating and cooling cycle. indication of a low charge, however, frosting and thawing can also be caused by insuffi cient air over the evaporator. Whenever you service a unit with an under charge of refrigerant, always suspect a leak. The leak must be repaired Checks for an undercharge
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REFRIGERANT CHARGING cont’d RESTRICTED REFRIGERANT SYSTEM A quick check for either condition begins at the evaporator. Troubleshooting a restricted refrigerant system can With a partial restriction, there may be gurgling sounds at the be diffi cult. The following proce dures are the more metering device entrance to the evaporator. The evaporator common problems and solutions to these problems. in a partial restriction could be partially frosted or have an ice There are two types of refrigerant
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TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES NORMAL FUNCTION OF VALVE NOTES: VALVE OPERATING * TEMPERATURE OF VALVE BODY CONDITION ** WARMER THAN VALVE BODY 12 3 456 POSSIBLE CAUSES CORRECTIONS Cool Hot Normal Cooling Hot Cool *TVB TVB as (2) as (1) Hot Cool Normal Heating Hot Cool *TVB TVB as (1) as (2) MALFUNCTION OF VALVE No voltage to coil. Repair electrical circuit. Check Electrical circuit and coil Defective coil. Replace coil. Low charge. Repair leak, recharge system
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COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Possible Cause Action Check voltage at compressor. 115V & 230V Low voltage units will operate at 10% voltage variance T-stat not set cold enough or inop- Set t-stat to coldest position. Test t-stat & erative replace if inoperative Compressor hums but cuts off on Hard start compressor. Direct test compressor. B10 overload If compressor starts, add starting components Compressor Open or shorted compressor wind- does not run Check
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Problem Possible Cause Action Replace fuse, reset breaker. If repeats, check Fuse blown or circuit tripped fuse or breaker size. Check for shorts in unit wiring & components Power cord not plugged in Plug it in Unit does not run System switch in "OFF" position Set switch correctly Inoperative system switch Test for continuity in each switch position Loose or disconnected wiring at Check wiring & connections. Reconnect per switch or other components wiring diagram Problem Possible Cause Actio
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Problem Possible Cause Action Overload inoperative. Opens too Check operation of unit. Replace overload if soon system operation is satisfactory Allow a minimum of 2 minutes to allow Compressor restarted before pressures to equalize before attempting to system pressures equalized restart. Instruct customer of waiting period Check voltage with unit operating. Check for other appliances on circuit. Air conditioner Compressor runs Low or fl uctuating voltage should be in separate circuit for
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Problem Possible Cause Action Sublimation: Ensure that foam gaskets are installed in When unconditioned saturated, between window panes & in between the outside air mixes with conditioned unit & the sleeve. Also, ensure that fresh air, condensation forms on the air/exhaust vents (on applicable models) are in cooler surfaces the closed position & are in tact Water "spitting" into room Follow installation instructions to ensure that Downward pitch of install
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HEAT / COOL ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS Problem Possible Cause Action Disconnect power to unit. Remove resistor Heat anticipator (resistor) shorted from t-stat bulb block. Plus in unit & allow to (on applicable models) operate. Feel resistor for heat. If not heat, replace resistor Room temperature uneven Wide differential - partial loss of Replace t-stat & check (Heating cycle) t-stat bulb charge Refer to appropriate wiring diagram. Resistor Incorrect wiring is energized du
