LG TB-H488RSS5 Service Manual Download | Manualshive

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Ceiling Duct Type

Air Conditioner

SERVICE MANUAL

MODELS: TB-H488RSS5

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Summary of Contents for TB-H488RSS5

Page 1: ...Ceiling Duct Type Air Conditioner SERVICE MANUAL MODELS TB H488RSS5 ...

Page 2: ...5 Operation Details 51 Installation of Indoor Outdoor Unit 54 Test running 66 Optional Operation 68 External Static Pressure air Flow 70 3 way Valve 71 Cycle 74 Cycle Troubleshooting Guide 78 Electronic Parts Troubleshooting Guide 79 Electronic control device 82 Exploded View and Replacement Parts List 83 2 ...

Page 3: ...iring Radio Frequency Control Optional Each controller can control 16 units and 8 controllers can be connected It operates maximum 16 units with the help of only one wired remote controller and each unit can be randomly started to prevent overcurrent Room temperature sensor Thermistor Maintains the room temperature in accordance with the Setting Temperature Indoor fan is delayed for 5 seconds at t...

Page 4: ...Program Cooling model only Heating model only Low Med High Cooling Operation Mode Heating Operation Mode Auto Operation Mode Soft Dry Operation Mode Fan Operation Mode HI MED LO Program Holiday SET CLR Min Hour Week Timer Cancel Timer Cancel High 39 C ļ LOW 11 C Only the Fan is in operation Cooling Heating Down to 18 C Up to 30 C Down to 16 C Up to 30 C ...

Page 5: ...1 Specifications 1 1 Indoor unit 5 5 5 ...

Page 6: ...ble included Earth No x mm2 AWG 5C x 3 5 12 White W x H x D mm 900 1 165 370 W x H x D inch 35 7 16 45 7 8 14 9 16 kg lbs 95 0 209 4 Scroll Model x No SB061YAB x 1 Three Phase Induction Motor W x No 4 050 x 1 R22 g oz 3 600 141 1 m ft 7 5 24 6 g m oz ft 65 0 76 Capillary SUNISO 4GSI or NM56M cc x No 1 650 x 1 2 26 17 2 Propeller m3 min x No 52 5 x 2 AC W x No 77 x 2 Cooling Rated dB A 61 Heating R...

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Page 9: ...ion Ø19 05 2 way Flare Connection Ø9 52 2 way Flare Connection Cooling Heating BY PASS 4 way Valve Accumulator Condenser out Capillary Tube Cooling Capillary Tube Evaporator in Capillary Tube Heating Capillary Tube M M M M Thermistor for Suction Air temperature Thermistor for evaporator outlet temperature Thermistor for evaporator outlet temperature Thermistor for Suction Air temperature 5 65 3 Pi...

Page 10: ...2 Soft Dry Operation The indoor fan speed is automatically set to the low so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by Micom Control 3 Cooling Mode Operation When selecting the Cooling Mode Operation the unit will operate according to remote controller settings and the operation diagram is as following 10 Intake Air temp SET...

Page 11: ...erates at seleted fan speed when it becomes lower than 39 C the fan operates at low speed 4 Heating Mode Operation Except Cooling Model The unit will operate according to the remote controller settings and the operation diagram is shown as following Hot Start Low Selecting Fan Speed minimum 3min Selecting fan speed minimum 10sec 1min A A minimum 10sec B 5 Hot Start Control The indoor fan stops unt...

Page 12: ...ntact your dealer if the remote controller displays this message CHECK Rectify the problem as shown in the table below before restarting operation During the normal operation CHECK won t be displayed in the remote controller Remote controller LCD Accident Point CH 01 Indoor room temperature thermistor error CH 02 Indoor piping thermistor error CH 03 Indoor main body Remote controller unit communic...

Page 13: ...ld easily connect with the outdoor unit The place where the unit is not affected by an electrical noise The place where air circulation in the room will be good There should not be near the unit any heat source or steam 2 Outdoor unit If an awning is built over the unit to prevent direct sunlight or rain exposure be careful that heat transfer from the condenser is not restricted There should be no...

Page 14: ...y study the following installation locations 1 In places such as restaurant and kitchen considerable amount of oil steam and flour adhere to the fan the fins of the heat exchanger resulting in heat exchange reduction spraying dispersing of water drops etc In such cases take the following actions Make sure that the ventilation fan for smoke collecting hood on a cooking table has sufficient capacity...

Page 15: ... after receiving customer s consent The room temperature sensor is built in the indoor unit This remote controller equipped with liquid crystal display If this position is higher or lower display is difficult to see The standard height is 1 2 1 5m high Routing of the remote controller cord Keep the remote controller cord away from the refrigerant pipe and drain pipe To protect the remote controlle...

Page 16: ...ps on the wall by ø 3 tapping screws accessory Fix the remote control cord WIRED REMOTE CONTROL INSTALLATION REMOTE CONTROL PREPARATION OPTIONAL DISASSEMBLING ELECTRICAL WIRING HOW TO MOUNT ONTO A WALL HOW TO INSERT BATTERIES Wire and make sure that terminal numbers are matched on unit side and remote controller side The maximum length of the cord is 100m If the length of the cord exceeds 50m use ...

Page 17: ...tralia the length of power supply cord measured from the entry of the power supply cord to the middle of live pin on the power plug should be over 1 8m If the supply cord is damaged it must be replaced by a special cord or assembly availible from the manufacturer of its service agent CAUTION 2 0 m m 2 0 m m N YL G N YL G NORMAL CROSS SECTIONAL AREA 0 75mm 2 18k 24k 30k 36k 42k 1 25mm2 48k 60k Capa...

Page 18: ...screws Use the cord clamper to fix the cord Perform the electrical wiring work according to the electrical wiring connection All wiring must comply with local requirements Select a power source that is capable of supply ing the current required by the air conditioner Use a recognized circuit breaker between the power source and the unit A disconnection device to adequately disconnect all supply li...

Page 19: ... 19 Preparation of Piping 6 Connecting Pipes to the Indoor Unit ...

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Page 22: ...ownward inclination 1 50 to 1 100 Prevent any upward flow or reverse flow in any part 5mm or thicker formed thermal insulator shall always be provided for the drain pipe 1 Declined installation of the indoor unit is very important for the proper drainage in the duct type air conditioner 2 Minimum thickness of the insulation for the connecting pipe shall be 5mm The unit must be horizontal or declin...

Page 23: ...AL INSULATION 5 7mm Indoor Outdoor WALL Make sure that there is no clearance here Overlap with thermal insulator for piping Thermal insulator for refrigerant pipe Local supply Thermal insulator for piping Local supply Hose crip for thermal insulator Local supply Union for liquid pipe Orifice Refrigerant pipe and thermal insulator Local supply Union for gas pipe Thermal insulator for refrigerant pi...

Page 24: ...checking button and down timer button for 3 sec onds at the same time To cancel the test run press any button After completing work be sure to measure and record trial run properties and store measured data etc The parameter to be measured are room temperature outside temperature suction temperature blow out temperature wind velocity wind volume voltage current presence of abnormal vibration and n...

Page 25: ...ting voltage is maintained at more than 90 percent of the rated voltage marked on the name plate 7 Confirm that the cable thickness is as specified in the power sources specification Particularly note the relation between cable length and thickness 8 Never fail to equip a leakage breaker where it is wet or moist 9 The following troubles would be caused by voltage drop down Vibration of a magnetic ...

Page 26: ... body and of remote controller sensor 3 Move the slide switch to set position 4 Close the rear cover and check if it works normally TH R14H SW TH REMO MAIN 2TH OP7 R18H R17H OP6 LO STAND SW HIGH HI R03S C070 R04S R02S R01S OP3 OP2 OP1 R19H R11H R13H R12H OP5R16H OP4 R15H CO1H REMO Room Temp sensor 2TH MAIN Position 2 Position 1 Position 3 Slide switch for 2Thermistor Select the position after coun...

Page 27: ...UNCTION SET TEMP Room Temp HI MED LO Heater Defrost Filter Preheat Out door Time Timer On Set no Time Off 01 03 05 07 09 11 13 15 17 19 21 23 Indoor Unit 1 Terminal Local Supply Block Terminal Local Supply Block Terminal Local Supply Block Main PCB 1 Main PCB 2 Main PCB 16 Wired Remote Controller Slide Switch OP7 Remote Controller PCB Indoor Unit 2 Main PCB Indoor Unit 16 Connector RED 12V YL SIGN...

Page 28: ...et to the service port of the 3 way valve Connect the charge hose to the service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the liquid side valve to the closed posi tion 6 Operate the air conditioner in cooling mode and stop it when the gauge indicates 1kg cm 2 g 7 Immediately set the 3 way valve to the close...

Page 29: ...lare nut on liquid side valve 4 Check for gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the gas cylinder and dis charge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylin der and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stem...

Page 30: ...discharge the refrigerant until the gauge indicates 0 kg cm 2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not run ning is higher than 1 kg cm2 G discharge the refrigerant until the gauge indicates 0 5 to 1 kg cm2 G if this is the case it will not be neces sary to apply a evacuation Discharge the refrigerant gradually if it is dis charged too suddenly the ...

Page 31: ...e port must be closed this test is only for checking whether pipe connection is ok or not 5 If there is no leakage discharge R22 in piping com pletely into tank for retrieving Complete discharge is needed for vacuuming If leakage is found please fasten the joint more tight ly 6 After closing the valve of charging hose discon nect the tank and connect the vacuum pump to charging hose and open the v...

Page 32: ...ose gas side slightly and then close it tightly 3 Operate the air conditioner for 10 15 min until cycle is stabilized 4 Close the spindle of service port liquid side high pressure and wait till pressure of gas side low pressure drops below 0kgf cm 2 5 After the needle of gauge indicates below 0 kgf cm 2 close the valve of gas side quickly and turn off the power 6 Disconnect the piping between indo...

Page 33: ...of 4 mmHg or less 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Lo Open Open Vacuum pump 3 Way valve Outdoor unit Liquid side Indoor un...

Page 34: ... approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while operating the air condition...

Page 35: ...ity is relatively higher temperature difference is smaller When the room air humidity is relatively lower tem perature difference is larger 2 Check temperature and pressure of refrigeration cycle Notice 1 The suction pressure is usually 4 5 6 0 kg cm2 G at normal condition 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty Suction press...

Page 36: ...YES Is the input voltage of transformer AC230V Check the FUSE and the wiring diagram Is the PIN 49 58 of MICOM DC5V Exchange MICOM YES NO Check the main P C B pattern NO YES Is the output voltage of IC03D DC5V NO Exchange IC03D Is the input voltage of IC03D about AC12V Check the 5V P C B pattern ...

Page 37: ...ES Does Relay malfunctions YES NO YES It is normal operation Exchange IC01M Exchange Relay YES YES NO YES Is it in Heating Mode Is the set temperature all right Change IC01M NO NO Adjust operation mode Adjust set temperature Is IC01M operated normally YES Check the connector CN OUT Check RY 4Way NO Is 4way valve operated Possible Trouble 3 Ineffective Heating ...

Page 38: ...S YES Is the LCD operated normally Is the terminal of wired Remocon T2 DC12V Is the pin 39 40 of Micom DC 5V Change the wired Remocon Check the wired Remocon PCB and DC 12V pattern NO NO Check the parts of communication Connect CN Remo and terminals of wired Remocon exactly ...

Page 39: ... 39 Electronic control device MAIN P C B ASM ...

Page 40: ... 40 Models TBNH488RSS5 346810 359012 354210 552111 152302 352118 330870 W0CZZ 1 268711 1 249941 336610 2 267110 263230 2 263230 1 336610 1 268711 2 ...

Page 41: ...11 437211 435512 437212 137213B 435511 430411 554160 554031 1 554031 2 552203B 552203A 447910 649950 549610 546810 546810 559010 559010 Models TBUH488RSS5 41 352111 552111 552114 552113 552116 552112 548490 ...

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