Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for LG TB-H488RSS5
Summary of Contents for LG TB-H488RSS5
- Page 1 Ceiling Duct Type Air Conditioner SERVICE MANUAL MODELS: TB-H488RSS5...
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Page 2: Table Of Contents
Contents Functions ..........................3 Product Specifications ......................5 Dimensions ..........................11 Refrigeration Cycle Diagram ....................31 Wiring Diagram ........................35 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... -
Page 3: Functions
Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) Room temperature control • Maintains the room temperature in accordance with the Setting Temperature. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Time Delay Safety Control •... - Page 4 Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode ( Soft Dry Operation Mode ( Heating Operation Mode ( Auto Operation Mode ( (Cooling (Heating model only) model only) Fan Speed Selection (Low) (Med) (High) Room Temperature Display : High:39°C LOW:11°C Temperature Setting Down to 18°C...
- Page 5 1. Specifications 1.1 Indoor unit...
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Page 6: Dimensions
1. Specifications 1.2 Outdoor Unit Outdoor unit TBUH488RSS5 Rated 14.0 Cooling Rated Btu/h 48,000 Capacity Rated 15.2 Heating Rated Btu/h 52,000 Cooling Rated 5.30 Power Input Heating Rated 5.00 EER / COP W / W 2.65 / 3.05 Power Supply V / Ø... - Page 9 3.Piping diagrams Model No.: TB-H488RSS5 Outdoor Unit Indoor Unit Thermistor for Thermistor for evaporator Suction Air temperature outlet temperature Ø9.52 / 3 way Ø9.52 / 2 way Flare Connection Flare Connection ← Evaporator in Cooling Capillary Tube Condenser out Capillary Tube...
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Page 10: Operation Details
Operation Details (1) The function of main controls/controller 1. Time Delay Safety Control • 3min ... The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle. (Protection of compressor) • 30sec ... The 4-way valve is ceased for 30sec. to prevent the abnormal noise of the refrigerant gas when the Heating operation is OFF or switched to the other operation mode while compressor is off. - Page 11 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. Intake Air temp. minimum 3min Setting temp.+3°C (Compressor OFF) Setting temp. (Compressor ON) minimum minimum 1min 10sec.
- Page 12 6. Defrost Control • Defrost control is available for 45 minutes since heating mode operation is started, and it will not prolong over 10 minutes. • Defrost control is carried out when the outdoor pipe temp. falls below -6°C for more than 3 minutes after 45 minutes are passed from starting of heating operation.
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Page 13: Installation Of Indoor, Outdoor Unit
Installation of Indoor, Outdoor Unit 1. Selection of the best location 1) Indoor unit Top view Select location Inspection hole (unit: mm) Install the air conditioner in the location that satis- (450X450) fies the following conditions. Control box • Place should easily bear a load exceeding four times the indoor unit’s weight. - Page 14 2. Indoor unit installation Installation of Unit Install the unit above the ceiling correctly. CASE 1 POSITION OF SUSPENSION BOLT • Apply a joint-canvas between the unit and duct to absorb unnecessary vibration. • Apply a filter Accessory at air return hole. (Unit:mm) Drainage hole •...
- Page 15 3. The Indoor Unit Installation • Select and mark the position for fixing bolts. • Drill the hole for set anchor on the face of ceiling. Old building New building • Insert the set anchor and washer onto the suspen- sion bolts for locking the suspension bolts on the ceil- ing.
- Page 16 WIRED REMOTE CONTROL INSTALLATION DISASSEMBLING • Separate the under plate from Remote control box. Front case Lever carefully Remote control the box open box body using a screw • Fix the cord clamps on the wall by ø 3 tapping driver, etc.
- Page 17 5. Connecting Cables between Indoor Unit and Outdoor Unit 1) Connecting cables to the Indoor Unit Connect the wires to the terminals on the control board individually according to the outdoor unit connection. • Ensure that the color of the wires of outdoor unit and the terminal No. are the same as 48k Btu/h •...
- Page 18 Perform the electrical wiring work according to the electrical wiring ELECTRICAL WIRING connection. • All wiring must comply with local requirements. Circuit Breaker • Select a power source that is capable of supply- Use a 35A(60K) circuit breaker or time ing the current required by the air conditioner.
- Page 19 6. Connecting Pipes to the Indoor Unit • Preparation of Piping –19–...
- Page 20 –20–...
- Page 21 –21–...
- Page 22 CAUTION 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. Front of view • The unit must be horizontal or declined to the drain hose connected when finished installation. Ceiling CORRECT INCORRECT...
- Page 23 • Drill the piping hole with 70mm dia, hole core drill. WALL • Piping hole should be slightly slant to the Indoor Outdoor outdoor side. 5~7mm INSULATION, OTHERS Insulate the joint and tubes completely. THERMAL INSULATION All thermal insulation must comply with local requirements. INDOOR UNIT Union for liquid pipe Thermal insulator for refrigerant pipe...
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Page 24: Test Running
FORM THE PIPINGS Seal a small opening around the pipings 1. Wrap the connecting portion of indoor unit with with gum type sealer. the Insulation material and secure it with two Plastic Bands. (for the right pipings) • If you want to connect an additional drain hose, the end of the drain-outlet should be kept at a distance Drain hose from the ground. - Page 25 2) Connection of power supply 1. Connect the power supply cord to the independent power supply. • Circuit breaker is required. 2. Operate the unit for fifteen minutes or more. 3) Evaluation of the performance 1. Measure the temperature of the intake and discharge air. 2.
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Page 26: Optional Operation
Optional Operation 1) Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode. (2) Select one of three selectable modes as follows. • Position 1: The room temperature is controlled by the thermistor of the main body. •... - Page 27 2) Group Control(Optional Wiring) • You can use a group control operation after connecting the brown and yellow wire of each air-conditioner. • Remove the resistor "OP 7" in remote controller. • It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent overcurrent.
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Page 28: 3-Way Valve
3-way Valve 1. Pumping down Liquid side Indoor unit Outdoor unit Open 3-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner in cooling mode (1) Confirm that both liquid side and gas side and stop it when the gauge indicates valves are set to the open position. - Page 29 1) Re-air purging (Re-installation) Liquid side Indoor unit Closed Outdoor unit 3-Way valve Gas side Closed 3-Way valve Gas cylinder OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas cylin- (1) Confirm that both the liquid side valve and the der, and set the 2-way and 3-way valves to the gas side valve are set to the closed position.
- Page 30 2) Balance refrigerant of the 3-way valve (Gas leakage) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (1) Confirm that both the liquid side and gas side (3) Open the valve (Lo side) on the charge set valves are set to the back seat.
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Page 31: Cycle
Cycle 1. Installation (Connecting the piping between indoor and outdoor unit) Liquid side Indoor unit Outdoor unit Gas side Gas cylinder Purge the air • Installation (1) Connect the piping between the indoor and out- (5) If there is no leakage, discharge R22 in piping com- door unit firmly. - Page 32 2. Disconnection (on moving) Liquid side Indoor unit Outdoor unit Gas side Retrieving Tank • Disconnection (1) Attach the charging hose (manifold gauge) to (6) Disconnect the piping between indoor and the service port. outdoor unit and then put on service cap to –...
- Page 33 3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure (1) Connect the vacuum pump to the center hose (3) Close the valve (Lo side) on the charge set, of charge set center hose turn off the vacuum pump, and confirm that the gauge needle does not move (approxima-...
- Page 34 4. Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure This is different from previous procedures. (1) Connect the charge hose to the charging Because you are charging with liquid refrigerant cylinder.
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Page 35: Cycle Troubleshooting Guide
Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. 0°C After all amount of refrigerant leaked Current : less than 80% of out, check refrigeration cycle rated current Temp. -
Page 36: Electronic Parts Troubleshooting Guide
Electronic Parts Troubleshooting Guide : The unit does not operate. Possible Trouble 1 Check the FUSE Is the input voltage and the wiring diagram. of transformer AC230V? Is the input voltage Check the main P.C.B of IC03D about AC12V? pattern. Is the output voltage Exchange IC03D. - Page 37 Possible Trouble 2 : The indoor fan does not operate. Is it in the HOT It is normal operation. START mode? Is IC01M operated Exchange IC01M. normally? Does Relay Exchange Relay. malfunctions. Check the fan motor and connector.(CN-MOTOR) Possible Trouble 3 : Ineffective Heating Adjust operation mode.
- Page 38 Possible Trouble 4 : Wired remote controller does not operate. Check the parts of Is the LCD operated communication. normally? Connect CN-Remo, and Is the terminal of wired terminals of wired Remocon T2 DC12V? Remocon exactly. Check the wired Remocon Is the pin 39, 40 of PCB and DC 12V pattern.
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Page 39: Electronic Control Device
Electronic control device MAIN P.C.B ASM –39–... - Page 40 • Models: TBNH488RSS5 346810 359012 336610-1 336610-2 W0CZZ-1 263230-1 263230-2 267110 354210 249941 268711-2 268711-1 152302 552111 352118 330870 –40–...
- Page 41 • Models: TBUH488RSS5 552203A 552203B 437212 554160 552112 552113 352111 552111 552116 649950 430411 554031-1 554031-2 552114 548490 447910 549610 546810 546810 137213B 435511 559010 559010 435512 435311 437211 –41–...