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GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY IN ORDER TO
PROPERLY DIAGNOSE PROBLEMS AND TO SAFELY
PROVIDE QUALITY SERVICE ON THESE DRYERS.
MODEL : TCD1870QGS
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the
prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by
this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright ©
2014 - 2017
LG Electronics Inc. All rights reserved. Only training and service purposes.
TCD1870CGS
TCD1870QGG
TCD1870CGG
CONFIDENTIAL
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Table of Contents
Related Manuals for LG TCD1870QGS
Summary of Contents for LG TCD1870QGS
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Page 1: Gas Dryer
Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual. -
Page 2: Table Of Contents
18-2. Drum &Motor Assembly ....................62 18-3. Case Assembly ......................63 19. PCB PICTURE ........................64 19-1. PCB Layout (Main) ....................... 64 19-2. PCB Layout (Sub) ......................65 Copyright © 2014 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes. - Page 3 Warning : For your safety the information in this manual must be followed to mini- mize the risk of fire or explosion or to prevent property damage, personal injury or death. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
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Page 4: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS RECONNECT ALL GROUNDING DEVICES If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened. ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. -
Page 10: Specifications
SPECIFICATIONS SPECIFICATIONS ■ Type : Gas Dryer ■ Rating : Please refer to the rating label regarding detailed information. ■ Single dryer size : 737mm (W)x 1090mm (D)x 1022mm (H) 29in (W)x 42 in (D)x 40 in (H) ■ Stack dryer size : 737mm(W) x 1090mm(D) x 2040mm(H) in (D)x 80 in (H) 29in (W)x 42... - Page 11 TCD1870CGS (single) TCD1870CGS (single) ITEM REMARK TCD1870CGG (stack) TCD1870CGS (stack) TYPE POWER SUPPLY 120V/60Hz Color Silver stone Porcelain (Single Model) Top plate Painted &Porcelain (Stack Model) MATERIAL & Door Trim Stainless Deco FINISH Door frame Chrom (Hairline) C/Panel Color Silver stone Drum Motor 385W Stack is double...
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Page 12: Features And Benefits
SPECIFICATIONS FEATURES AND BENEFITS ■ COIN/OPL TYPE - SIDE BY SIDE(TCD1870CGS) ■ STACK (TCD1870CGG) - UPPER - LOWER 1. DISPLAY LED 3. START BUTTON 2. CYCLE BUTTON 4. STATUS LED... - Page 13 ■ COIN TYPE - SIDE BY SIDE(TCD1870QGS) ■ STACK (TCD1870QGG) - UPPER - LOWER 1. DISPLAY LED 3. START BUTTON 2. CYCLE BUTTON 4. STATUS LED...
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Page 14: Initial Steps For Installing Your Dryer
INITIAL STEPS FOR INSTALLING YOUR DRYER... -
Page 15: Leveling The Dryer
LEVELING the Dryer. Leveling Feet... -
Page 16: Procedure For Reversing The Door
Procedure for Reversing the Door Door and latch should be aligned at the center when closed. Otherwise, the door will not open, lose, or latch properly. - Page 17 Connecting the Exhaust The dryer must be installed wih a proper exhaust duct connection to the outside. and Venting System. The dryer must be installed with provisions for adequate combustion and make-up air supply.
- Page 18 Connection of Gas Supply Electrical Plug Connection...
- Page 19 Preparation of the Dryer Dryer Airflow Confirming Heat Source Operation...
- Page 20 High Altitude Burner Orifice Sizing * Heating Value [Btu/ft3 ] LNG:1017,LPG:2573...
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Page 21: Debit System Installation Instructions
DEBIT SYSTEM INSTALLATION INSTRUCTIONS Coindrop Installation - Install the coindrop to the control panel of upper dryer Connecting coindrop and machines - Connect the lower coin harness to right coindrop. - Connect the upper coin harness to left coindrop. - Page 22 - Install the blue and white connector of the control panel to upper dryer. - Assemble the control panel of upper dryer. - Assemble the control panel of lower washer/dryer.
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Page 23: Electrical Requirements For Gas Dryers
ELECTRICAL REQUIREMENTS FOR GAS DRYERS 120 Volt, 60Hertz, with 3-prong Grounding Plug Following are additional instructions regarding electrical connections and requirements for gas dryers. WARNING: The wiring and grounding must conform to all applicable local regulations. Please contact a qualified electrician to check your home’s wiring and fuses to ensure that your home has adequate electrical power to operate the dryer. -
Page 24: Gas Requirements And Instructions
GAS REQUIREMENTS AND INSTRUCTIONS Following are important instructions and information concerning the requirements for the gas supply and service for gas dryers. IMPORTANT WARNING : THE GAS SUPPLY AND SERVICE FOR A GAS DRYER MUST COMPLY WITH ALL LOCAL CODES AND ORDINANCES. IN THE ABSENCE OF ANY LOCAL CODES OR ORDINANCES IN YOUR AREA, THE GAS SUPPLY AND SERVICE FOR YOUR GAS DRYER MUST COMPLY WITH THE LATEST EDITION OF THE NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA 54(USA) OR CANADIAN GAS INSTALLATION CODE CAS B149.1(CANADA) -
Page 25: Exhaust Requirements And Maintenance
EXHAUST REQUIREMENTS AND MAINTENANCE Dryer maintenance : 1.Check all pipe connections to inspect for gas leakage twice a year using non-corrosive leak detection fluid. DO NOT use an open flame to inspect for gas leakage. 2. Check Blower fan noise and vibration twice a year. Clean carefully the blower fan if there are sticked lints and other things. -
Page 26: Exhaust Duct
EXHAUST DUCT • The exhaust duct must be smooth on the inside (low air resistance). The exhaust duct must have gentle bends. • It applies to the installation of several dryers on a shared exhaust duct that: The exhaust duct diameter must increase after each dryer. - Page 27 Over area A Exit Inspection * LG exhaust Duct Diameter: ø6"(153mm) • Use the exhaust duct over the inner diameter of exhaust pipe. • Do not use too small inner diameter of exhaust pipe or too long exhaust duct, Because it makes bad ventilation and low drying performance and it will be cause of trouble.
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Page 28: Cleaning The Lint Screen
Exhaust and Dryer Maintenance Cleaning the Lint Screen 1. Clean the lint filter daily. Always make sure the WARNING lint filter is clean, because a clogged lint filter may increase drying times. • Disconnect the dryer’s electric power prior to any cleaning or maintenance. 2. -
Page 29: Dryer Cycle Process
DRYER CYCLE PROCESS Default Conditions of operation and termination Drying Cooling Cycle Temp- Display erature time Electro- Temp- Default Temp- Level sensor Control time Control** WHITES AND 5 min/ HIGH More Dry Saturation 68– 4 ° C 2 min. 47– 5¡C COLORS Time PERMANENT... -
Page 30: Component Testing Information
COMPONENT TESTING INFORMATION WARNING ailure to follow these instructions can result in death or electric shock. Component Test Procedure Check result Remark NT101 2. Safely limits thermostat (Manual reset) Open at 110 (110 NT102 3. Outlet Thermostat Measure resistance of terminal Blow housing - ( Thermal cut off) to terminal... -
Page 31: Motor Diagram And Schematic
MOTOR DIAGRAM AND SCHEMATIC... -
Page 32: Control Lay - Out
CONTROL LAY - OUT PWB ASSEMBLY DISPLAY LAY-OUT PWB ASSEMBLY LAY-OUT... - Page 33 PWB ASSEBMBLY SUB LAY-OUT...
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Page 34: Wiring Diagram
WIRING DIAGRAM CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper Operation after servicing. GAS DRYER WIRING DIAGRAM ELECTRONIC CONTROL MAIN PWB SUB PWB POWER CORD NOISE POWER CIRCUIT FILTER MOTOR HEATER... -
Page 35: Diagnostic Test
DIAGNOSTIC TEST 1. This TEST should be used for Factory test /Service test. Do not use this DIAGNOSTIC TEST other than specified. 2. Activating the heater manually with the door open may trip the thermostat attached to the heater, therefore do not activate it manually. - Page 36 Test 1 Thermistor Test --- Measure with Power Off...
- Page 37 Test 2 Motor Test WARNING ¥ Before measuring resistance, be sure to turn power off, and do voltage discharge. (When discharging, contact the metal plug of power cord with the earth line.) ¥ Failure to follow these instructions can result in death or electric shock. Trouble Symptom Drum does not turn, and heater does not operate.
- Page 38 Test 3 Moisture Sensor WARNING...
- Page 39 Test 4 Door switch test WARNING • Before measuring resistance, be sure to turn power off, and do voltage discharge. (When discharging, contact the metal plug of power cord with the earth line.) • Failure to follow these instructions can result in death or electric shock. Door opening is not sensed.
- Page 40 Test 5 Test when Ignition is not good... check with power on. WARNING • Wear the isulated gloves before you check. • Failure to follow these instructions can result in death or electric shock. Ignition is not good. Trouble Symptom Spark is not occurred during operation. Measurement Condition Check after power on. Reset switch Push rest switch 2~3 times and operate • C heck the gas the machine. Check ignition operation and supply condition and the gas valve. spark is occurred or not. • C heck the air flow Push the micro switch in the air flow switch. switch And check spark is occurred dor not.
- Page 41 Test 6 Blower fan abnormal vibration & noise solution WARNING • Before doing maintenance. Be sure to turn power and gas off, and do voltage discharge. • Failure to follow these instructions can result in death or electric shock. Trouble Symptom Abnormal vibration and noise are occurred in the back side of the machine. Measurement Condition After turning power off, measure the resistance. Drum motor • Check supply Is there abnormal vibration and noise Voltage, the drum at the drum motor operation step on Test motor and the mode? roller. Roller Is there abnormal vibration and noise at the • C heck blower fan fan and the drum motor operation step, In the back side and clean it. after pushing start button additionally? Blower fan Check legs which is well installed or not.
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Page 42: Error Mode
ERROR MODE Meaning of Error Codes that LED displays during occurrence or problem. Check the duct blocked and fire occurred 1. Blower motor harness is disconnected 1. Check the blower motor harness. 2. Blower motor coil or hall sensor is damaged 2. -
Page 43: Change Gas Setting (Natural Gas, Propane Gas)
CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) WARNING! instructions and all applicable codes and requirements of the Authority Having Jurisdictuion. If the information proper installation of this kit. The installation is not proper and complete until the operation of the converted STEP 1 : ADJUSTMENT ①... - Page 44 A. Conversion information Manifold Inlet gas pressure Conversion Pressure Gas type Input rating Connector Marking (max rating) Minimum Maximum Natural Gas MFX62442001 55,000BTU/hr 5.0”w.c. 10.5”w.c. 3.8”w.c. Propane Gas MFX62442002 55,000BTU/hr 10.0”w.c. 13”w.c. 8.67”w.c. B. Normal operating sequence of the ignition system ①...
- Page 45 E. Instructions for checking the inlet gas Maximum pressure pressure.(See Picture 2) Minimum setting pressure ① Loosen the screw in the inlet gas pressure hole on the nut(Yellow) setting gas valve nut(Black) ② Connect a manometer tube to the inlet gas pressure hole. ③...
- Page 46 DRYING FLOW CHART ■ START KEY PUSH Drum motor ON Fan motor ON (Pre purge) Air flow E24 error with switch ON operating stop Ignition controller ON Ignition controller lock out and displaying E21 Ignition error with operating stop DRYING GAS IGNITION Thermostat Ignition...