Sharp AF-05CML Service Manual - Page 13

AF-05CML INSULATION TEST Check the resistance between the terminals and case. Reading must be more than 10MΩ at DC 500V. OVERLOAD RELAY Check continuity between terminals with volt-ohm-meter. INSULATION TEST Check resistance between terminals and the relay case. Reading must be more than 10MΩ at DC 500V. COMPRESSOR (1) Take the wires off compressor terminals. FAN CAPACITOR RUNNING CAPACITOR (2) Set selector switch of volt-ohm-meter on the resistance range. (3) Put the probes on the terminals of the compressor and check continuity between each terminal. INSULATION TEST Check the resistance between the terminals and the copper tube. Reading must be more than 10MΩ at DC 500V. TROUBLESHOOTING GUIDE Symptom Neither fan motor not compressor operate In sufficient cooling No cooling Check Defect 1) Check power supply switch or 1) Fuse open or circuit braker plug and measure the voltage open 2) Plug disconnected 3) Plug connected properly but contact defective. 1) Check thermostat 1) Knob position not properly adjusted 2) Defective thermostat 2) Check air filter Air filter clogged 3) Check for a high heat source 4) Check doors and windows 5) Check if condenser and evaporator are clean 6) Check if any object is restricting heat radiation from the condenser. 7) Undersized air conditioner 8) Sealed system 1) No temperature difference between discharge pipe and suction pipe of compressor 2) Check if temp.difference between inlet and outlet air of indoor unit is over 14˚F 1) Gas leak 2) Compressor defective 1) Equipment defective if no temp. difference 2) Outside air too high temp. 3) Air conditioner normal but heat leak excessive 3) Check indoor exchanger inlet/outlet piping temp. Sweat is less than half of coil or frost sticks to capillary tube 1) Capillary tube restricted 2) Gas leak Remedy 1) If fuse or breaker are normal, ask the power supply company for check. 2) Connect properly. 3) Change power supplym cord with plug. 1) Move thermostat knob to a higher number (toward 10). 2) Replace Clean Remove the added heat source Windows and doors must be kept closed Clean them with steam cleaner or another method Remove the object or move the air conditioner Use Cooling Load Estimate Form (Refer to page 16). Check sealed system 1) Repair gas leak 2) Change compressor 1) Change or repair defect 2) Improve ventilation, avoid sunshine 3) Calculate cooling load and change or remove heat source 1) Change capillary tube 2) Check for gas leak and repair, recharge 13