SERVICE MANUAL This parts etc. This room air conditioner was manufactured and assembled under a strict quality control system. The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit. 1.1 SAFETY PRECAUTIONS 1.
The thermostat automatically controls cooling or heating, but the fan runs continuously whenever the air conditioner is in operation. If the room is too warm, turn the thermostat control clockwise. If the room is too cool, turn the thermostat control counterclockwise.
2. DISASSEMBLY INSTRUCTIONS — Prior to disassembling the unit, make sure that the POWER switch is set to OFF and the power cord is unplugged from the wall receptacle. 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Open the inlet grille downward. 2.
2.2 AIR HANDLING PARTS 2.2.1 ORIFICE, HEATER ASSY AND TURBO FAN 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the cabinet. (Refer to section 2.1.2) 3. Remove the 2 screws which fasten the evaporator at the left side and the right side. (See Fig.
2.2.3 SHROUD 1. Remove the fan. (Refer to section 2.2.2) 2. Remove the screw which fastens the shroud. 3. Remove the shroud. (See Fig. 9) 4. Re-install the components by referring to the removal procedures, above. 2.3 ELECTRICAL PARTS 2.3.1 MOTOR 1.
2.3.4 POWER CORD 1. Remove the control box. (Refer to section 2.1.3) 2. Unfold the control box. (Refer to section 2.3.3) 3. Disconnect the grounding screw from the control box. 4. Disconnect 2 receptacles. 5. Remove a screw which fastens the clip cord. 6.
2.4 REFRIGERATION CYCLE CAUTION Discharge the refrigerant system using a Freon Recovery System. Install a valve for the recovery before venting the Freon. Remove the valve when finished. 2.4.1 CONDENSER 1. Remove the cabinet. (Refer to section 2.1.2) 2. Remove the brace and the shroud cover. (Refer to section 2.2.1) 3.
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NOTES — Replacement of the refrigeration components 1. When replacing the refrigeration components, be sure todischarge the refrigerant system using a FreonTM recovery System. Install a valve for the recovery before venting the Freon. Remove the valve when finished. 2. After discharging the unit completely, remove the desired component, and unbrace the pinch-off tubes.
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Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pinch-off tool capable of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve. Figure 18A-Pulling Vacuum Figure 18B-Charging —11—...
Refer to Fig.19 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. EVAPORATOR COILS COOLED LIQUID PRESSURE DROP " ROOM AIR CONDITIONER CYCLE OF REFRIGERATION SUCTION LIME COMPLETE LIQUID COOL LOW PRESSURE VAPOR BOIL OFF POINT ROOM AIR HEAT LOAD...
3.3 TROUBLESHOOTING GUIDE In general, possible trouble is classified in two causes. The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application. Unit is running but cooling is ineffective Check cold air circulation for smooth flow.
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Check power source. Check control switch setting. Only compressor fails to start. Drop in power voltage. Defective compressor capacitor. Check capacitor. Replacement. Irregular motor resistance ( ) Irregular motor insulation ( ) Replacement of compressor (Motor damaged) Fails to Start Improper thermostat setting Loose terminal connection.
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COMPLAINT Fan motor will not run. No power Power supply cord Rotary switch Wire disconnected or connection loose Capacitor (Discharge capacitor before testing.) Will not rotate Fan motor runs Revolves on overload. intermittently Fan motor noise. Grommets Turbo fan Loose set screw Worn bearings CAUSE Check voltage at outlet.
Rotary Thermostat Capacitor (Discharge capacitor before servicing.) Compressor Overload ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING 115V 208/230V CAUSE Check voltage. See the limits at the bottom of this page. If not within limits, call an electrician. Check the wire connections, if loose, repair or replace the terminal.
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COMPLAINT Compressor cycles Voltage on overload. Overload Fan motor Condenser air flow restriction Condenser fins (damaged) Capacitor Wiring Refrigerating system Insufficient cooling or Air filter heating Exhaust damper door Unit undersized Excessive noise. Blower or fan Copper tubing CAUSE Check the voltage. See the limits on the preced- ing page.
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FRIEDRICH AIR CONDITIONING CO. Visit our web site at www.friedrich.com Post Office Box 1540 • 4200 N. Pan Am Expressway • San Antonio, Texas 78295-1540 • (210) 357-4400 • FAX (210) 357-4480 P/NO.:3828A20040G Printed in the U.S.A UE08/UE10/UE12 (05/05)
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