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• TROUBLESHOOTING GUIDE • CIRCUIT DIAGRAM • EXPLODED VIEW AND SERVICE PARTS LIST CAUTION - BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. - ONLY FOR AUTHORIZED SERVICE PERSONNEL. Sears, Roebuck and Co., Hoffman Estates, IL. 60179 U.S.A.
1. PREFACE This service manual provides various service information, including the mechanical and electrical 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 FEATURES •...
1.3 LOCATIONS OF CONTROLS • MODEL: 79053 • MODEL: 79074 FAN "gOOOL ,. ow HIGH_ HIGH HIGH F-_--------_-. _ HIGH FANFF " -oooL LOW /r r COOL 2• _ FAN 3 _i FAN'I !"cOOL TEMP MODE MODE • MODEL: 79122/79184 3•...
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• MODEL: 79056 DISPLAY REMOCON SIGNAL RECEIVER TEMPERATURE SETTING y' Th s buttoncan automaticay contro the temperatureof the room. The temperaturecan be set withina rangeof 60°F to 86°F by I°F. Selectthe lowernumberfor lowertemperatureof the room. The fan stopswhen the compressor stopscooling. •...
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REMOTE CONTROL Precaution: The Remote Controller will not operate propedy if strong light strikes the sensor window of the air conditioner or if there are obstacles behveen the Remote Controller and the air conditioner. ON/OFF TIMER - STOPPING OPERATION • Everytime you push this button, when the set is operating, timer is set as follows.
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• MODEL: 79188 DISPLAY -- ON/OFF TIMER • Everyfime you pushthisbutton, t imerisset as follows, • This button can automatically (1Hour-2Hours - 3Hours - *4Hours_ 5Hours-6Hours - control t heairflowdirection. 7Hours_ 8Hours - *9Hours - *10Hours - *11 Hours - 12Hours- C ancel) UTO SWING •...
REMOTE CONTROL Precaution: The Remote Controller will not operate properly if strong light strikes the sensor window of the air conditioner or if there are obstacles between the Remote Controller and the air conditioner, AUTO SWING • Presstheairflowdirection control b utton forthe verticalIouver's to swingautomatically, ON/OFF TIMER - STOPPINGOPERATION •...
2. DISASSEMBLY INSTRUCTIONS • MODEL: 79053/79056 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Disconnect the unit from the power source. 2. Remove the two knobs by pulling them off. Using a screwdriver, remove the screw that secures the front grille to control board. (See Figure 1) 3.
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2.2 AIR HANDLING PARTS 2.2.1 ORIFICE 1. Disconnect the unit from the power source. 2. Remove the front gdlle. (Refer to Section 2.1.1) 3. Remove the cabinet. (Refer to Section 2.1.2) 4. Remove the control board. (Refer to Section 2.1.3) 5.
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2.2.3 AIR GUIDE AND MOTOR 1. Disconnect the unit from the power source. 2. Remove the front grille. (Refer to Section 2.1.1) 3. Remove the cabinet. (Refer to Section 2.1.2) 4. Remove the control board. (Refer to Section 2.1.3) 5. Remove the orifice. (Refer to Section 2.2.1 ) 6.
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2.3.2 COMPRESSOR 1. Remove the cabinet. (Refer to Section 2.1.2) 2. Discharge the refrigerant by using a refrigerant recovery system, 3. Remove the overload protector. (Refer to Section 2.3.1) 4. After discharging the unit completely, unbrace the suction and discharge pipes at the compressor connections.
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2.3.6 FAN MOTOR 1. Disconnect the unit from the power source. 2. Remove the front grille. (Refer to Section 2.1.1 ) 3. Remove the cabinet. (Refer to Section 2.1.2) 4. Remove the control board. (Refer to Section 2.1.3) 5. Remove the orifice. (Refer to Section 2.2.1) 6.
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2.4.2 EVAPORATOR 1. Remove the cabinet. (Refer to Section 2.1.2) 2. Discharge the refrigerant by using a refrigerant recovery system. 3. Remove the orifice. (Refer to Section 2.2.1) 4. After discharging the refrigerant completely, unbraze the interconnecting tube at the evaporator connections, 5.
• Model: 79074 -- Before the following disassembly, POWER SWITCH is set to OFF and disconnect the power cord. 2.5 MECHANICAL PARTS 2.5.1 FRONT GRILLE 1. Open the Inlet grille downward and remove the air filter. 2. Remove the screw which fastens the front grille. 3.
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2.6 AIR HANDLING PARTS 2.6.1 AIR GUIDE 1. Remove the front grille. (Refer to section 2.5.1) 2. Remove the cabinet. (Refer to section 2.5.2) 3. Pull the cover E.P.S upward. 4. Remove 3 screws which fasten the UPPER AIR GUIDE 5.
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2.6.3 FAN, SHROUD 1. Remove the cabinet. (Refer to section 2.5.2) 2. Remove the 4 screws which fasten the condenser, 3. Move the condenser sideward carefully. 4. Remove the clamp which secures the FAN with a hand plier. 5. Remove the FAN, 6.
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2.7.3 CAPACITOR 1. Remove the control box. (Refer to section 2.5.3) 2. Remove the screw and the clamp which fastens the capacitor. 3. Disconnect all the leads of capacitor terminals. 4. Re-instan the components by referring to the removal procedure, above. 2.7.4 POWER CORD 1.
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2.7.7 MOTOR 1. Remove the cabinet. (Refer to section 2.5.2) 2. Remove the air guide. (Refer to section 2.6.1) 3. Remove the blower, (Refer to section 2.6.2) 4. Remove the fan. (Refer to section 2.6.3) 5, Remove the shroud. (Refer to section 2.6.3) 6, Remove the control box.
• MODEL: 79122 -- Before the following disassembly, POWER SWITCH is set to OFF and disconnect the power cord. 2.9 MECHANICAL PARTS 2.9,1 FRONT GRILLE Type A Screw 1. Open the inlet gdlle downward. (See Figure 41) 2. Remove the screw which fastens the front gdlle. 3.
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2.10 AIR HANDLING PARTS 2.10.1 AIR GUIDE AND BLOWER 1, Remove the front grille. (Refer to section 2.9.1) 2. Remove the cabinet, (Refer to section 2.9.2) 3. Remove the control box. (Refer to section 2.9,3) 4. Remove the 4 screws which fasten the brace, 5.
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2.10.3 SHROUD 1. Remove the fan. (Refer to section 2.10.2) 2. Remove the screw which fastens the shroud. 3. Remove the shroud. (See Figure 47) 4. Re-install the component by referring to the removal procedure, above. Figure 47 2.11 ELECTRICAL PARTS 2.11.1 OVERLOAD PROTECTOR...
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2.11.3 CAPACITOR 1. Remove the control box. (Refer to section 2.9,3) 2. Remove the screw which located in the front, 3. Open the bottom side of control box. 4. Remove the screw and the clamp which fastens the capacitor. 5. Disconnect all the leads of capacitor terminals. 6.
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2.11.7 MOTOR 1. Remove the cabinet. (Refer to section 2.9.2) 2. Remove the evaporator. 3, Remove the orifice. (Refer to section 2.10,1 ) 4. Remove the blower. (Refer to section 2.10.1) 5. Remove the fan. (Refer to section 2.10.2) 6. Remove the control box cover and disconnect 5 or 4 wires of motor housing.
• MODEL: 79184/79188 -- Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord. 2.13 MECHANICAL PARTS 2.13.1 FRONT GRILLE 1. Open the inlet grille downward. 2. Remove the screw which fastens the front grille. 3.
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2.14 AIR HANDLING PARTS 2.14.1 COVER (AT THE TOP) 1. Remove the front grille. (Refer to section 2.13.1) 2. Remove the cabinet. (Refer to section 2.13.2) 3. Remove 11 screws which fasten the brace and covers. 4. Remove the covers and the brace. (See Figure 60) 5.
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2.14.4 SHROUD 1. Remove the fan. (Refer to section 2.14.3) 2. Remove the 2 screws which fasten the shroud. 3. Remove the shroud. (See Figure 64) 4. Re-install the component by referring to the removal procedure, above. Figure 64 2.15 ELECTRICAL PARTS 2.15.1 MOTOR 1.
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2.15.3 CAPACITOR 1. Remove the control box. (Refer to section 2.13.3) 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 67) 5.
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2.1 5.6 ROTARY SWITCH 1. Remove the control box. (Refer to section 2.13.3) 2. Unfold the control box. (Refer to section 2.15.3) 3. Remove 2 screws which fasten the rotary switch. 4. Disconnect all the leads of the rotary switch termi- nals.
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NOTES Replacement of the refrigeration cycle. 1. When replacing the refrigerating cycle, be sure to discharge the refrigerant by using a refrigerant recovery sys- tem. 2. After discharging the unit completely, remove the desired components, and unbraze the pinch-off tubes. 3.
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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. COMPOUND GAUGE MANIFOLD GAUGE CONDENSER (HIGH PRESSURE SIDE) BELOW COMPRESSOR EVAPORATOR (LOW PRESSURESIDE) CAPILLARY TUBE...
3. INSTALLATION - MODEL: 79053/79056 ITEM • HOW TO INSTALL 1. Insert the sliding panels (ITEM H) into the guides of the air conditioner. Fasten the curtains to the unit with screws (ITEM B), as shown in Figure 73. ITEM S Figure 73 2.
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6. SECURE THE SLIDING PANELS Extend the sliding panels to fill the window open- WINDOW FRAME ing using 4 screws (ITEM C) to secure them, as shown in Figure 79. 1/4_" SEAL UPPER GUIDE 7. INSTALL THE SASH SEAL AND SASH LOCK BO'FI-OMGUIDE •...
• MODEL: 79074/79122 HOW TO INSTALL 1. Remove the screws which fasten the cabinet at both sides and at the back. Figure 81 2. Slide the unit out of the cabinet by gripping the base pan handle and pull forward while bracing the cabinet.
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(_)Screw(Type 8. Select the position that will place the sill supports near the outer most point on sill (See Figure 88). Attach the sill supports to the cabinet track hole in relation to the selected position using TYPE A screw @. Cabinet OUTDOOR fNDOOR...
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17. The vent control handle must be straightened before the decorative front is attached. Pull down part ® to align with part ®. • 18. FRONT INSTALLATION Vent Control Installation • Hook upper tabs of front grille into slots on the Installing Bottom Rail Seal cabinet top.
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• MODEL: 79184/79188 3.5 HOW TO INSTALL 1. Remove the screws which fasten the cabinet at the back and side of the unit. Figure 100 2. Slide the unit out of the cabinet by gripping the base pan handle and pull forward while bracing the cabinet.
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Window sash 8. Pull the bottom window sash down behind the Top retainer bar upper guide until they meet. NOTE: Foam-PE 4 • Do not pull the window sash down so tightly that the movement of sliders is restricted. Attach the Cabinet Frame curtain cabinet to the window stool by driving the TYPE B...
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14. Front Installation install the front grille with the cabinet as follows: • Hook upper tabs of front grille into slots on the cabinet top. (See Figure 113) • Push front grille's tips toward the cabinet in order to snap side tabs into the cabinet. (See Figure 113) •...
4.2 PIPING SYSTEM CONDENSER COILS CAPILLARY MOTOR TUBE BLOWER EVAPORATOR COILS Following is a brief descdption of the important components and their function in what is called the refrigeration system. Reference should be made to Figure 117 to follow the refrigerating cycle and the flow of the refrigerant in the cooling cycle.
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4.3 TROUBLESHOOTING GUIDE In general, possible trouble is classified in two kinds. The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air Conditioning caused from a defect in the refrigeration circuit and improper application. UNIT IS RUNNING COOLING...
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Fails to Stad Check of circuit breaker Check of power source. and fuse. Check of control switch Gas leakage of feeler bulb of thermostat. setting. Check control switch. Compressor fails only to Fan only fails to start. start. Improper wiring. Drop of power voltage.
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CAUSE COMPLAINT REMEDY Check voltage at outlet. Correct if none. No power -'an motor will not run. Check voltage to rotary switch. If none, check Power supply cord power supply cord. Replace cord if circuit is open. Check switch continuity. Refer to widng diagram Rotary switch for terminal identification.
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CAUSE REMEDY COMPLAINT If cracked, out of balance, or partially missing, Fan motor noise. replace it. Blower If cracked, out of balance, or partially missing, replace it. Loose set screw Tighten it. If knocking sounds continue when running or Worn bearings loose, replace the motor.
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CAUSE REMEDY COMPLAINT Fan motor If not running, determine the cause. Replace if Compressor cycles on overload required. Condenser air flow Remove the cabinet, inspect the interior surface restriction of the condenser. If restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush.
• MODEL : 79188 POWER INPUT WH(BL) _ BK(BR) i ...... - _j_GN<G_,_ "r.E.MISTOR , BK MOTOR CAPACITOR OR(BR) PART NO. Ol"Y L0cA'n0N DESCRIPTION 79188 PER SEI 5417AR2652A COMPRESSOR 6120AR2194D(6+30pF, 370/400VAC) CAPACITOR 4681AR6033B ; FAN MOTOR 3H02932C SPRING CLIP(FORBLOWER,FAN) 5834AR1599A BLOWER 5900AR1508A 6871A20037J...