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Thru-the-Wall Series
Service and Parts
Manual
Thru-the-Wall Series
115 Volts US08B10A:Starting with serial number LFMK00001
US10B10A:Starting with serial number LGBK00003
US12B10A:Starting with serial number LGBK00001
230 Volts US10B30A
US14B30A
Starting with serial number LGBK00001
US12B30B:
Unifit. Cool (03/07)
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CONTENTS 2.4 REFRIGERATION CYCLE.................................10 1. PREFACE 2.4.1 CONDENSER ......................................10 1.1 SAFETY PRECAUTIONS ...............................2 2.4.2 EVAPORATOR ....................................10 1.2 INSULATION RESISTANCE TEST.................2 2.4.3 CAPILLARY TUBE...............................10 1.3 SPECIFICATIONS ..........................................3 1.4 FEATURES .....................................................5 3. TROUBLESHOOTING
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1.3 SPECIFICATIONS 1.3.1 FOR US08B10A/US10B10A/US12B10A MODELS US08B10A US10B10A US12B10A REMARK ITEMS POWER SUPPLY 1Ø, 115V, 60Hz COOLING CAPACITY (Btu/h) 8,000 9,800 11,500 INPUT (W) 830 1,110 1,310 RUNNING CURRENT (A) 7.5 10.2 12.0 E.E.R (Btu/w.h) 9.6 8.8 8.8 REFRIGERANT (R-22) CHARGE(g) 545g(19.2OZ) 470g(16.6OZ) 500g(17.6OZ) OPERATING INDOOR (°C) 26.7(DB) 19.4(WB) TEMPERATURE OUTDOOR (°C) 35(DB) 23.9(WB) EVAPORATOR 2 ROW 12STACKS 3 ROW 12STACKS CONDENSER 2ROW 17STACKS, L-BENDING TYPE LOUVERE
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1.3.2 FOR US10B30A/US12B30B/US14B30A MODELS US10B30A US12B30B US14B30A REMAR ITEMS 1Ø, 230/208V, 60Hz POWER SUPPLY 10,000/9,800 11,500/11,200 13,200/12,800 COOLING CAPACITY (Btu/h) 1,060/1,040 1,310/1,270 1,550/1,500 INPUT (W) 4.7/5.2 6.0/6.4 7.1/7.6 RUNNING CURRENT (A) 9.4/9.4 8.8/8.8 8.5/8.5 E.E.R. (Btu/W.h) 480g(16.9OZ) 485g(17.1OZ) 545g(19.2OZ) INDOOR (°C) OPERATING TEMPERA-TURE 26.7(DB) 19.4(WB) OUTDOOR (°C) 35(DB) 23.9(WB) REFRIGERANT (R-22) CHARGE(g)
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1.4 FEATURES • Designed for cooling only. • Built in adjustable THERMOSTAT. • Washable one-touch filter. • Powerful and quiet. • Slide out chassis for the simple installation and service. • Compact size. 1.5 CONTROL LOCATIONS 1.5.1 COOLING ONLY MODEL • OPERATION REMOTE CONTROL SIGNAL RECEIVER TEMPERATURE SETTING • Use this button to automatically control the temperature of the room. The temperature can be set within a range of 60°F to 86°F by increments of 1°F. • The setting appears in the dis
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2. DISASSEMBLY INSTRUCTIONS — Prior to disassembling the unit, make sure that the POWER is 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. Remove the screw which fastens the front grille. 3. Pull the front grille from the right side. 4. Remove the front grille. (See Fig. 1) 5. Re-install the component by referring to the removal procedure. Figure 1 2.1.2 CABINET 1. After disassembling the FRONT GRILLE, re
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2.2 AIR HANDLING PARTS 2.2.1 ORIFICE, 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. 4) 4. Move the evaporator to the side carefully. Figure 4 5. Remove the orifice. (See Fig. 5) Figure 5 8. Using handheld pliers, remove the clamp which secures the turbo fan. (See Fig. 6) Figure 6 9. Remove the turbo fan with pliers or your hand, w
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2.2.3 SHROUD 1. Remove the fan. (Refer to section 2.2.2) 2. Remove the shroud. (See Fig. 9) 3. Re-install the components by referring to the removal procedures, above. 2.3 ELECTRICAL PARTS 2.3.1 MOTOR 1. Remove the cabinet. (Refer to section 2.1.2) Figure 9 2. Remove the clamp cord and disconnect the wire housing in control box. (Refer to section 2.1.3) 3. Remove the turbo fan. (Refer to section 2.2.2) 4. Remove the fan. (Refer to section 2.2.2) 5. Remove the 4 or 2 screws which fasten the motor
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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 Base pan. 4. Disconnect 2 receptacles. 5. Remove a screw which fastens the clip cord. 6. Pull the power cord. (See Fig. 13) 7. Re-install the components by referring to the removal procedure, above. (Use only one ground-marked hole, , for ground connection.) 8. If the supply cord of this appliance is damaged, it must be replaced w
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2.4 REFRIGERATION CYCLE CAUTION TM 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. (Refer to section 2.2.1) 3. Remove the 7 screws which fasten the condenser. 4. After discharging the refrigerant completely into a TM Freon Recovery System, unbraze the interconnecting tube at the condenser connections. 5. R
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NOTES — Replacement of the refrigeration cycle. 1. When replacing refrigeration components, be sure 6. Recharge as follows : TM to discharge the refrigerant system using a Freon 1) Refrigeration cycle systems are charged from the recovery System. High-side. If the total charge cannot be put Install a valve for the recovery, before venting the in the High-side, the balance will be put in the Freon, remove the valve when finished. suction line through the access valve which you 2. After dischar
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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 17A-Pulling Vacuum Figure 17B-Charging —12— COMPOUND GAUGE CONDENSER (HIGH PRESSURE SIDE) MANIFOLD GAUGE B A CAPILLARY TUBE SEE INSETS BELOW EVAPORATOR (LOW PRESSURE SIDE) COMPRESSOR LOW HI A B B A EXTERNAL VACUUM PUMP CHARGING CYLINDER C
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3. TROUBLESHOOTING GUIDE 3.1 OUTSIDE DIMENSIONS 3 24" 20- /32" (499mm) (610mm) 3.2 PIPING SYSTEM CONDENSER COILS FAN CAPILLARY TUBE MOTOR COMPRESSOR TURBO FAN EVAPORATOR COILS Following is a brief description of the important components and their functions in the refrigeration system. Refer to Fig. 18 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. ROOM AIR CONDITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS CONDENSER COILS VAPOR INLET SUCTION LINE HOT
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3.3 TROUBLESHOOTING GUIDE In general, possible trouble is classified in two causes. 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/or improper application. Unit is running but cooling is ineffective Ineffective Cooling Check cold air circulation Check outdoor coil Check heat load increase. for smooth flow. (heat exchanger) & the fan operation. Unexpected residue Dirty in
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Fails to Start Check power source. Check circuit breaker and fuse. Check control switch setting. Check control board Only compressor fails to Only fan fails to start. start. Improper wiring. Drop in power voltage. Improper thermostat setting Defect of fan motor capacitor. Defective compressor capacitor. Loose terminal connection. Irregular motor resistance ( ). Check capacitor. Irregular motor insulation ( ). Improper wiring Replacement. Replacement of fan motor Irregular motor resistance
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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. Replace switch if defective. Wire disconnected or Connect wire. Refer to wiring diagram for terminal connection loose identification. Repair or replace loose terminal. Capacitor (Discharge Test
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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. Check wire locations. If not per wiring diagram, correct. Rotary Check for continuity, refer to the wiring diagram for terminal identification. Replace the switch if circuit i
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REMEDY COMPLAINT CAUSE Compressor cycles Voltage Check the voltage. See the limits on the preced- on overload. ing page. If not within limits, call an electrician. Overload Check overload, if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.) Fan motor If not running, determine the cause. Replace if required. Condenser air flow Remove the cabinet. Inspect the interior surface restriction of the condenser; if restricted, clean care
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4. SCHEMATIC DIAGRAM 4.1 CIRCUIT DIAGRAM • MODEL : US08B10A, US10B10A, US12B10A, US10B30A, US12B30B,US14B30A —19—
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Cool ' F F 1 L O W Energy F F 2 3 M H E I G D H Saver Fan TEM P Tim er FAN M O DE TIM ER SPEED POW ER 5. EXPLODED VIEW • MODEL: US08B10A, US10B10A, US12B10A, US10B30A, US12B30B,US14B30A 749180 E 152302 147581 147582-1 135303 147582-2 130900 149980 135312 359012 W48602 W48602 559010 435301 346811 435301 435300 352380 349600 731273 147900 130410 A 264110 W6631 268714 B 263230 C 567502 268712 W0CZZ 550140 238310 237200 267110 —20 —
