Room Air Conditioner SERVICE MANUAL MODEL: BWC186MBAB0 / BWC226NBAB0 (Applied to new Refrigerant R-410A) CAUTION - BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. - ONLY FOR AUTHORIZED SERVICE.
1.4 FEATURES • Designed for cooling only. • Side air-intake, side cooled-air discharge. • Powerful and quiet cooling. • Built in adjustable THERMOSTAT. • Slide-in and slide-out chassis for the simple • Washable one-touch filter. installation and service. • Compact size. 1.5 CONTROL LOCATIONS Part B •...
2. DISASSEMBLY INSTRUCTIONS — Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord. 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Open the inlet grille upward. 2. Remove the screw which fastens the front grille. 3.
2.2 AIR HANDLING PARTS 2.2.1 COVER (AT THE TOP) 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the cabinet. (Refer to section 2.1.2) 3. Remove 11 screws which fasten the brace and covers. 4. Remove the covers and the brace. (See figure 4) 5.
2.2.4 SHROUD 1. Remove the fan. (Refer to section 2.2.3) 2. Remove the 2 screws which fasten the shroud. 3. Remove the shroud. (See figure 8) 4. Re-install the component by referring to the removal procedure, above. Figure 8 2.3 ELECTRICAL PARTS 2.3.1 MOTOR 1.
2.3.3 CAPACITOR 1. Remove the control box. (Refer to section 2.1.3) 2. Remove the screw and knobs which fasten the display panel. 3. Disconnect the 2 leads from the rocker switch and remove the panel. 4. Remove a screw and unfold the control box. (See figure 11) 5.
2.3.6 ROTARY SWITCH 1. Remove the control box. (Refer to section 2.1.3) 2. Unfold the control box. (Refer to section 2.3.3) 3. Remove 2 screws which fasten the rotary switch. 4. Disconnect all the leads of the rotary switch terminals. 5.
2.4 REFRIGERATION CYCLE CAUTION • This unit is charged with R-410A, pay attention not to charge R-22. 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. Remove 6 screws which fasten the condenser. 4.
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NOTES — Replacement of the refrigeration cycle. 6. Recharge as follows : CAUTION 1) Refrigeration cycle systems are charged from the Do not use the existing charge set for R-22. High-side. If the total charge cannot be put It is necessary to use new charge set for R-410A. in the High-side, the balance will be put in the The pressure of R-410A is 1.6 times higher than suction line through the access valve which you...
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Equipment needed: • The tools must be used according to the type of refrigerant. Never use the gauge manifold, charge hose, charge cylinder or vacuum pump with other refrigerants. Always carry out the work with dedicated tools. • 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.
3. TROUBLESHOOTING GUIDE 3.1 OUTSIDE DIMENSIONS 675(770) 3.2 PIPING SYSTEM CONDENSER COIL DRIER CAPILLARY TUBE MOTOR COMPRESSOR MUFFLER MUFFLER BLOWER EVAPORATOR COIL Following is a brief description of the important components and their functions in the refrigeration system. Refer to figure 19 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. ROOM AIR CONDITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS...
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 runs but poor cooling Ineffective Cooling Check of cold air circulation...
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Fails to Start Check of power source. Check of circuit breaker and fuse. Check of control switch Gas leakage of feeler bulb setting. of thermostat Check of control switch. Only compressor fails to Only fan fails to start. start. Improper wiring. Drop of power voltage.
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COMPLAINT CAUSE REMEDY Fan motor will not run. No power Check voltage at outlet. Correct if none. Power supply cord Check voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open. Rotary switch Check switch continuity. Refer to wiring diagram for terminal identification.
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COMPLAINT CAUSE REMEDY Compressor will not run, Voltage Check voltage. See the limits on the preceding. but fan motor runs. page. If not within limits, call an electrician. Wiring Check the wire connections, if loose, repair or replace the terminal. If wires are off, refer to wiring diagram for identification, and replace.
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REMEDY COMPLAINT CAUSE Capacitor Test capacitor. Wiring Check the terminals. If loose, repair or replace. Refrigerating system Check the system for a restriction. Air filter Insufficient cooling or If restricted, clean of replace. Exhaust damper door heating Close if open. Unit undersized Determine if the unit is properly sized for the area to be cooled.
4. SCHEMATIC DIAGRAM 4.1 CIRCUIT DIAGRAM POWER INPUT BK(BR) WH(BL) (Plain) (Ribbed) SYNC. M. WIRING DIACRAM ROCKER SWITCH LOCATION NO. DESCRIPTION Q'TY PER SET REMARKS POWER CORD ROTARY SWITCH FAN MOTOR CAPACITOR THERMOSTAT COMPRESSOR —19—...