Room Air Conditioner
Contents
1. Room Air Conditioner SERVICE MANUAL MODEL BWC186MBABO BWC226NBABO Applied to new Refrigerant R 410A CONTENTS 1 PREFACE 1 1 SAFETY 2 0 2 1 2 INSULATION RESISTANCE TEST 2 1 3 SPECIFICATIONS order 3 1 4 FEATURES sea 4 1 5 CONTROL EOGATIONS aa 4 2 DISASSEMBLY INSTRUCTIONS 2 1 MECHANICAL 5 2 1 1 FRONT GRILLE c dati ciere 5 2 a itd a 5 2 1 3 CONTROL BOX 5 2 2 AIR HANDLING 6 2 2 1 COVER AT THE 6 2BLOWER 6 Po GAB 6 2 2 4 SHROUD 7 2 3 ELECTRICAL PARTS euere 7 23 1 MOTOR none 7 2 3 2 COMPRESSOR 7 2 3 3 CAPACITOR 8 2 3 4 POWER CORD wists sea 8 2 3 5 THERMOSTAT tette 8 2 3 6 ROTARY 9 2 3 7 SYNCHRONOUS MOTOR 9 1 PREFACE 2 4 REFRIGERATION CYCLE 10 2 4 1 CONDENSER adno 10 242 EVAPORATOR 10 2 4 3 CAPILLARY TUBE ias dte beris 10 3 TROUBLESHOOTING GUIDE 3 1 OUTSIDE DIMENSIONS 13 3 2 PIPING SYSTEM nina 13 3 3 TROUBLESHOOTING GUIDE 14 4 SCHEMATIC DIAGRAM 4 1 CIRCUIT DIAGRAM eene 19 5 EXPLODED 20 6 REPLACEMENT PARTS LIST2. CAPILLARY TUBE EE d E Low PRESSURE VAPOR LIQUID REFRIGERANT Figure 19 13 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 for smooth flow Dirty indoor coil Heat exchanger Y Malfunction of fan Clogged of air filter Obstruction at air outlet Stop of auto air swing Correct above trouble Check clogging in refrigeration circuit Repair clogging in refrigeration circuit Y Check of outdoor coil heat exchanger amp the fan Check heat load increase operation Check gas leakage Unexpected residue Repair gas leak Overloaded Circuit r Replacement of unit if the unit is beyond repair Check of inside gas Y pressure Adjusting of refrigerant charge Malfunction of compressor Replacement of compressor Satisfactory operation
3. 21 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 SAFETY PRECAUTIONS 1 When servicing the unit set the ROTARY SWITCH or POWER SWITCH to OFF and unplug the power cord 2 Observe the original lead dress If a short circuit is found replace all parts which have been overheated or damaged by the short circuit 3 After servicing the unit make an insulation resistance test to protect the customer from being exposed to shock hazards 1 2 INSULATION RESISTANCE TEST 1 Unplug the power cord and connect a jumper between 2 pins black and white 2 The grounding conductor green or green amp yellow is to be open 3 Measure the resistance value with an ohm meter between the jumpered lead and each exposed metallic part on the equipment at all the positions except OFF or O of the ROTARY SWITCH 4 The value should be over 1 2 1 3 SPECIFICATIONS SPEC AT 230V iue BWC186MBABO BWC226NBABO POWER SUPPLY 10 220 240V 50Hz COOLING CAPACITY Btu h 18 000 21 000 INPUT W 2 250 2 730 RUNNING CURRENT A 10 1 12 5 REFRIGERANT R 410A CHARGE g 780 780 OPERATING INDOOR C 27 DB 19 WB TEMPERATURE OUTDOOR C 3
4. continue when running or loose replace the motor If the motor hums or noise appears to be internal while running replace motor 16 COMPLAINT CAUSE REMEDY Compressor will not run but fan motor runs Voltage Check voltage See the limits on the preceding 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 is open Thermostat Check the position of knob If not at the coldest setting advance the knob to this setting and restart unit Check continuity of the thermostat Replace thermostat if circuit is open Capacitor Discharge capacitor before servicing Check the capacitor Replace if not within 10 of manufacturers rating Replace if shorted open or damaged Compressor Check the compressor for open circuit or ground If open or grounded replace the compressor Overload Check the compressor overload if externally mounted Replace if open If the compressor temperature is high remove the overload cool it and retest Compressor cycles on overload Voltage Check the voltage See the limits on the preced ing page If
5. 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 Compressor cycles on overload Cont d Fan motor If not running determine the cause Replace if required Condenser air flow restriction Remove the cabinet inspect the interior surface of the condenser if restricted clean carefully with a vacuum cleaner do not damage fins or brush Clean the interior base before reassembling Condenser fins damaged If condenser fins are closed over a large area on the coil surface head pressures will increase causing the compressor to cycle Straighten the fins or replace the coil COMPLAINT CAUSE REMEDY Capacitor Test capacitor Wiring Check the terminals If loose repair or replace Refrigerating system Check the system for a restriction Insufficient cooling or heating Air filter If restricted clean of replace Exhaust damper door Close if open Unit undersized Determine if the unit is properly sized for the area to be cooled Excessive noise Blower or fan Check the set screw or clamp If loose or missing correct If the blower or fan is hitting air guide rearrange the air handling parts Copper tubing Remove the cabinet and carefully rearrange tubing not to contact cab
6. receptacles Remove a screw which fastens the clip cord Pull the power cord See figure 12 Re install the component by referring to the removal procedure above Use only one ground marked hole for ground connection If the supply cord of this appliance is damaged it must be replaced by the special cord The special cord means the cord which has the same specification marked on the supply cord Figure 12 fitted to the unit 2 3 5 THERMOSTAT 1 2 3 4 5 6 Remove the control box Refer to section 2 1 3 Unfold the control box Refer to section 2 3 3 Remove the 2 screws which fasten the thermostat Disconnect all the leads of thermostat terminals Remove the thermostat See figure 13 Re install the components by referring to the removal procedure above Figure 13 2 3 6 ROTARY SWITCH 1 2 3 4 Remove the control box Refer to section 2 1 3 Unfold the control box Refer to section 2 3 3 Remove 2 screws which fasten the rotary switch Disconnect all the leads of the rotary switch terminals Remove the rotary switch See figure 14 Re install the components by referring to the above removal procedure above 2 3 7 SYNCHRONOUS MOTOR 1 2 3 4 Remove the control box Refer to section 2 1 3 Unfold the control box Refer to section 2 3 3 Remove the crankshaft Disconnect all the leads of the synchronous motor Remove the 2 screws which fasten t
7. with temperature difference of inlet amp outlet air 7 10 C 14 Fails to Start Y Check of power source Check of control switch setting Only compressor fails to start Drop of power voltage Defect of compressor capacitor Check capacitor Replacement Check of circuit breaker and fuse Gas leakage of feeler bulb of thermostat Check of control switch Y Only fan fails to start Y Improper wiring Improper thermostat setting Y Defect of fan motor Loose terminal connection capacitor Improper wiring Irregular motor resistance Q Irregular motor insulation Q Y Replacement of fan motor Irregular motor resistance Q Irregular motor insulation 0 Replacement of compressor Motor damaged 15 Regular but fails to start Replacement of compressor locking of rotor metal 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
8. 5 DB 24 WB EVAPORATOR 2 ROW 15 STACKS 3ROW 15 STACKS CONDENSER 2 ROW 19 STACKS FAN INDOOR TURBO FAN FAN OUTDO PROPELLER TYPE FAN WITH SLINGER RING FAN SPEEDS FAN COOLING 2 3 FAN MOTOR 6 POLES OPERATION CONTROL ROTARY SWITCH ROOM TEMP CONTROL THERMOSTAT AIR DIRECTION CONTROL VERTICAL LOUVER RIGHT amp LEFT HORIZONTAL LOUVER UP amp DOWN CONSTRUCTION SLIDE IN OUT CHASSIS COMPRESSOR INTERNAL OVERLOAD PROTECTOR POWER CORD PROTECTOR FAN MOTOR INTERNAL THERMAL PROTECTOR 1 5m 3 WIRE WITH GROUNDING ATTACHMENT PLUG CORD CONNECTED TYPE DRAIN SYSTEM DRAIN PIPE OR SPLASHED BY FAN SLINGER NET WEIGHT Ibs kg 130 59 152 69 OUTSIDE DIMENSION inch 26 1627 32 x 26946 26 x 1627 32 x 305 16 WxHxD mm 660 x 428 x 675 660 x 428 x 770 3 1 4 FEATURES Designed for cooling only Powerful and quiet cooling Slide in and slide out chassis for the simple installation and service 1 5 CONTROL LOCATIONS VENTILATION The ventilation lever must be in the CLOSE position in order to maintain the best cooling conditions When a fresh air is necessary in the room set the ventilation lever to the OPEN position The damper is opened and room air is exhausted NOTE Before using the ventilation feature make the lever as shown First pull down part amp to horizontal line with part B THERMOS
9. TAT Thermostat will automatically control the temperature of the room Select the higher number for the lower temperature of the room The temperature is selected by positioning the knob to the desired position The 5 or 6 position middle position is a normal setting for average conditions OPERATION OFF 0 Turns the air conditioner off MED FAN 99 Permits the medium fan speed operation without cooling LOWFAN the low fan speed operation without cooling HIGH COOL 6 Permits cooling with the high fan speed operation MED COOL 3k Permits cooling with the medium fan speed operation LOW COOL x Permits cooling with the low fan speed operation AUTO SWING ON Air swing is operated while OPERATION knob is set to the COOL position OFF 1 Stops the operation of air swing Side air intake side cooled air discharge Built in adjustable THERMOSTAT Washable one touch filter Compact size CLOSE VENT OPEN Thermostat Operation Auto Swing Off D Low Cool 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 Remove the screw which fastens the front grille Pull the front grille from the right side Remove the front grille See figure 1 Re i
10. X 3551A30015A 3551A30015A R 135515 COVER ASSEMBLY TOP INDOOR 3551A30001A 3551A30001A R 137215 PANEL ASSEMBLY CONTROL 3721A20002A 3721A20002A R 146812 MOTOR ASSEMBLY SYNC 2H01102A 2H01102A R 147581 1 LOUVER HORIZONTAL 5990A20032A 5990A20032A R 147581 2 LOUVER HORIZONTAL 5990A20033A 5990A20033A R 147582 LOUVER VERTICAL 4758AR6157A 4758AR6157A R 148000 BRACE 4800AR7272A 4800AR7271A R 149410 KNOB ASSEMBLY 4941A30001A 4941A30001A R 149980 SHROUD 4998A10027A 4998 10027 R 152302 FILTER ASSEMBLY A C 5231AR6159A 5231AR6159A R 249950 CONTROL BOX ASSEMBLY SINGLE ABQ32714903 ABQ32714903 R 264110 POWER CORD ASSEMBLY 6411A20049P 6411A20049P R 266002 SWITCH ROCKER 2H01316C 2H01316C R 266003 SWITCH ROTARY 2 00598 2H00598E R 269310 THERMOSTAT ASSEMBLY 2H01109L 2H01109M R 346811 MOTOR ASSEMBLY SINGLE 4681A20081C 4681A20130A R 349001 DAMPER VENTILATION 4900AR7265A 4900AR7265A R 349480 ORIFICE 4948A20016A 4948A20016A R 349600 MOUNT MOTOR 4960 1596 4960A10006A R 352113 TUBE ASSEMBLY DISCHARGE 5211A20805Y AJR33016803 R 352390 AIR GUIDE ASSEMBLY AEC33842501 AEC33842501 R 354210 EVAPORATOR ASSEMBLY FIRST ADL33751201 5421A20017N R 359012 FAN TURBO 5900A20027A 5900A20027A R 550140 ISOLATOR COMP 4830AR4335A 4022U L005A R 552102 TUBE CAPILLARY 5210A30040K MJU39967801 R 554031 CONDENSER ASSEMBLY FIRST 5403A20112A 5403A20112A R NOTE Please ensure GCSC since these parts may be changed depending up
11. e left side and the top side Move the evaporator sideward carefully Remove the orifice from the air guide carefully Remove the clamp which secures the blower with plier See figure 5 Remove the blower with plier or your hand without touching blades See figure 6 Re install the components by referring to the removal procedure above 2 2 3 FAN 1 2 3 4 5 6 7 Remove the cabinet Refer to section 2 1 2 Remove the brace and shroud cover Refer to section 2 2 1 Remove the 5 screws which fasten the condenser Move the condenser sideways carefully Remove the clamp which secures the fan Remove the fan See figure 7 Re install the components by referring to the removal procedure above Figure 6 Figure 7 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 Remove the cabinet Refer to section 2 1 2 2 Remove the cover control and disconnect a wire F 972 housing control box Refer to section 2 1 3 gt 2 3 Remove the blower Refer to section 2 2 2 Remove the fan Refer to section 2 2 3 5 Remove the 4 screws which fasten the motor See figure 9 Remove the motor 7 Re install the components by referrin
12. g to the removal procedure above gt 9 2 3 2 COMPRESSOR 1 Remove the cabinet Refer to section 2 1 2 2 Discharge the refrigerant system using Freon Recovery System If there is no valve to attach the recovery system install one such as a WATCO A 1 before venting the Freon Leave the valve in place after servicing the system 3 Disconnect the 3 leads from the compressor 4 After purging the unit completely unbrace the suction and discharge tubes at the compressor connections 5 Remove the 3 nuts and the 3 washers which fasten the compressor Figure 10 6 Remove the compressor See figure 10 7 Re instill the components by referring to the removal procedure above 2 3 3 1 2 3 Remove the control box Refer to section 2 1 3 Remove the screw and knobs which fasten the display panel Disconnect the 2 leads from the rocker switch and remove the panel Remove a screw and unfold the control box See figure 11 Remove the screw and the clamp which fastens the capacitor See figure 11 Disconnect all the leads of capacitor terminals Re install the components by referring to the removal procedure above Figure 11 2 3 4 POWER CORD 1 2 3 NOOO Remove the control box Refer to section 2 1 3 Unfold the control box Refer to section 2 3 3 Disconnect the grounding screw from the control box Disconnect 2
13. he synchronous motor See figure 15 Re install the components by referring to the removal procedure above Figure 14 Figure 15 2 4 REFRIGERATION CYCLE 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 After discharging the refrigerant completely unbraze the interconnecting tube at the condenser connections 5 Remove the condenser 6 Re install the components by referring to notes See figure 16 DOTT G 7 27 D GHGS 2 4 2 EVAPORATOR 1 Remove the cabinet Refer to section 2 1 2 2 Remove the top cover and the brace Refer to section 2 2 1 3 Discharge the refrigerant completely 4 Remove the 3 screws which fasten the evaporator at the left side and the top side 5 Move the evaporator sideward carefully and then unbraze the interconnecting tube at the evaporator connectors 6 Remove the evaporator 7 Re install the components by referring to notes See figure 17 Figure 17 2 4 3 CAPILLARY TUBE 1 Remove the cabinet Refer to section 2 1 2 2 Remove the brace Refer to section 2 2 1 3 After discharging the refrigerant completely unbraze the interconnecting tube at the capillary tube 4 Remove the capilla
14. inet compressor shroud and barrier Auto air swing fails Rotary switch Set the knob to HIGH COOL or LOW COOL while rocker switch is ON Wiring Synchronous motor Check terminals If loose repair or replace Check the synchronous motor for open circuit 18 4 SCHEMATIC DIAGRAM 4 1 CIRCUIT DIAGRAM ROTARY SWITCH 3854 2206 WIRING POWER INPUT Ribbed WH BR ROCKER SWITCH BK IBK BR I LOCATION NO DESCRIPTION Q TY PER SET REMARKS POWER CORD ROTARY SWITCH FAN MOTOR CAPACITOR THERMOSTAT 2 10 1 COMPRESSOR m 19 5 EXPLODED VIEW 20 6 REPLACEMENT PARTS LIST MODEL BWC186MBABO BWC226NBABO DESCRIPTION ER 01 186 0 226 0 130410 BASE ASSEMBLY SINGLE AAN32860201 32860602 R 130910 CABINET ASSEMBLY SINGLE ABQ32714903 3091AR6056N R 135312 GRILLE ASSEMBLY FRONT AEB33008902 AEB33008902 R 135313 GRILLE INLET 3530A10189A 3530A10189A R 135500 COVER CONTROL BO
15. kward EXTERNAL VACUUM PUMP CHARGING CYLINDER Fitting UNF 1 2 20 Figure 18A Pulling Vacuum Figure 18B Charging 12 3 TROUBLESHOOTING GUIDE 3 1 OUTSIDE DIMENSIONS 675 770 660 428 3 2 PIPING SYSTEM CONDENSER COIL DRIER CAPILLARY TUBE MOTOR COMPRESSOR MUFFLER MUFFLER BLOWER EVAPORATOR COIL REFRIGERANT FLOW 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 CONDENSER COILS SUCTION LIME VAPOR INLET COMPLETE LIQUID HOT BOIL OFF POINT GOOL TOW PRESSURE VAPOR DISCHARGED COOLED AIR AIR a 2 ROOM AIR HEAT LOAD lt OUTSIDE COOLING a AIR FOR REFRIGERANT PASS THROUGH MOTOR Zu COMPRESSOR LIQUID PRESSURE LIQUID OUTLET DROP EZZ HIGH PRESSURE VAPOR
16. nstall the component by referring to the removal procedure oR OP Figure 1 2 1 2 CABINET 1 After disassembling the FRONT GRILLE remove the screws which fasten the cabinet at both sides 2 Remove the two screws which fasten the cabinet at back See figure 2 3 Pull the base pan forward Figure 2 2 1 3 CONTROL BOX 1 Remove the front grille Refer to section 2 1 1 2 Pull the base pan forward so that you can remove the 2 screws which fasten the cover control at the right side See figure 3 3 Remove the 3 screws which fasten the control box See figure 3 4 Discharge the capacitor by placing a 20 000 ohm resistor across the capacitor terminals 5 Disconnect two wire housings in the control box Pull the control box forward completely 7 Re install the components by referring to the removal procedure See figure 3 Refer to the circuit diagram found on page 19 in this manual and on the control box Figure 3 2 2 AIR HANDLING PARTS 2 1 2 4 Re install the components by referring to the 2 1 COVER AT THE TOP Remove the front grille Refer to section 2 1 1 Remove the cabinet Refer to section 2 1 2 3 Remove 11 screws which fasten the brace and covers Remove the covers and the brace See figure 4 removal procedure above 2 2 2 BLOWER 1 2 3 Remove the cover Refer to section 2 2 1 Remove the 3 screws which fasten the evaporator at th
17. on the buyer s request GCSC WEBSITE http biz L Gservice com 24 A OIN DESCRIPTION 5 BWC186MBABO BWC226NBABO 554160 COMPRESSOR SET 2520UTEP2AA 2520UXFP2CA R 559010 FAN ASSEMBLY AXIAL 5900AR1330B 5900AR1330B R 35211A TUBE ASSEMBLY SUCTION AJR32971903 5211A10094H R WOCZZ CAPACITOR 2 00986 2 00986 R W48602 CLAMP SPRING 3H02932C 3H02932C R W52106 1 TUBE EVAPORATOR 5210A30009X 5210A30144U R W52106 2 TUBE EVAPORATOR 5210A30009W 5210A30144V R NOTE Please ensure GCSC since these parts may be changed depending upon the buyer s request GCSC WEBSITE http biz LGservice com 22 LG Electronics Inc July 2007 P No 3828A20529G Printed in Thailand
18. open Rotary switch Check switch continuity Refer to wiring diagram for terminal identification Replace switch if defective Wire disconnected or connection loose Connect wire Refer to wiring diagram for terminal identification Repair or replace loose terminal Capacitor Discharge capacitor before testing Test capacitor Replace if not within 10 of manufacturer s rating Replace if shorted open or damaged Will not rotate Fan blade hitting shroud or blower wheel hitting scroll Realign assembly Units using slinger ring condenser fans must have 7 4 to 5 16 inch clearance to the base If it is hitting the base shim up the bottom of the fan motor with mounting screw s Check fan motor bearings if motor shaft will not rotate replace the motor Fan motor runs intermittently Revolves on overload Check voltage See limits on this page If not within limits call an electrician Test capacitor Check bearings Does the fan blade rotate freely If not replace fan motor Pay attention to any change from high speed to low speed If the speed does not change replace the motor Fan motor noise Grommets Check grommets if worn or missing replace them Fan If cracked out of balance or partially missing replace it Blower If cracked out of balance or partially missing replace it Loose set screw Tighten it Worn bearings If knocking sounds
19. p oil from foaming and being drawn into the vacuum pump 3 Operate the vacuum pump for 20 to 30 minutes until 600 microns of vaccum is obtained Close valves A and B and observe vacuum gauge for a few minutes rise in pressure would indicate a possible leak or moisture remaining in the system With valves A and B closed stop the vacuum pump 4 Remove the hose from the vacuum pump and place it on the charging cylinder See figure 18B Open valve C Discharge the line at the manifold connection 5 The system is now reagy for final charging 6 Recharge as follows 1 Refrigeration cycle systems are charged from the High side If the total charge cannot be put in the High side the balance will be put in the suction line through the access valve which you installed as the system was opened 2 Connect the charging cylinder as shown in figure 18B With valve C open discharge the hose at the manifold connection 3 Open valve A and allow the proper charge to enter the system Valve B is still closed 4 If more charge is required the high side will not take it Close valve A 5 With the unit running open valve B and add the balance of the charge a Do not add the liquid refrigerant to the Low side b Watch the Low side gauge The pressure of optimum condition is as below Cooling OUTSIDE TEMPERATURE THE PRESSURE OF LOW SIDE GAUGE 5 9 2 9 7 kgf cm G an 130 9 138 0 Ibf in G NOTE If
20. ry tube 5 Re install the components by referring to notes 10 NOTES Replacement of the refrigeration cycle EJ Do not use the existing charge set for R 22 It is necessary to use new charge set for R 410A The pressure of R 410A is 1 6 times higher than that of R 22 Thus the high pressure side gauge of charge set should be used higher pressure gauge of 50kg cm range gr When replacing the refrigeration cycle be sure to discharge the refrigerant using recovery System If there is no valve to attach the recovery system install one such as a WATCO A 1 before venting the Leave the valve in place after servicing the system After discharging the unit completely remove the desired component and unbraze the pinch off tubes Solder service valves into the pinch off tube ports leaving the valves open Solder the pinch off tubes with Service valves Evacuate as follows 1 Connect the vacuum pump as illustrated figure 18A 2 Start the vacuum pump slowly open manifold valves A and B with two full turns counterclockwise and leave the valves open The vacuum pump is now pulling through valves A and B by means of the manifold TEE Use vacuum pump equipped with check valve applied to be prevented from flowing backward high vacuum equipment is used open slowly with the two full turns counterclockwise This will kee
21. the actual pressure are higher than shown the system is most likely over charged and charge should be removed If the actual pressure are lower than shown the system is most likely undercharged and charge should be added c Turn off valve B and allow pressure to drop d Repeat steps b and c until the balance of the charge is in the system 6 When satisfied the unit is operating correctly use the pinch off tool with the unit still running and clamp on to the pinch off tube Using a tube cutter cut the pinch off tube about 2 inches from the pinch off tool Use sil fos solder and sold pinch off tube closed Turn off the unit allow it to set for a while and then test the leakage of the pinch off connection 11 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 COMPOUND GAUGE CONDENSER EM HIGH PRESSURE SIDE varoo 9 Q GAUGE te SEE INSETS BELOW CAPILLARY TUBE EVAPORATOR LOW PRESSURE SIDE COMPRESSOR CAUTION Use vacuum pump equipped with check valve applied to be prevented from flowing bac
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