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McQuay MWM Service Manual

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Summary of Contents for McQuay MWM

  • Page 1 SERVICE GUIDE BOOK...

  • Page 2: Table Of Contents

    © 2012 Mcquay International. All rights reserved throughout the world. Bulletin illustrations cover the general appearance of Mcquay International products at the time of publication. We reserve the right to change design and construction specification at any time without notice...

  • Page 3: Model Name

    MCQUAY Service Guide Book Model Name 1.0 MODEL NAME 1.1 Product Name Description Description Generic Model Name MCQUAY Brand Wall Mounted Fan Coil Unit WM / 5WM MWM / M5WM Wall Mounted AC Inverter Fan Coil Unit MWMV Wall Mounted DC Inverter Fan Coil Unit...

  • Page 4: Conversion Table 2.1 Conversion Table

    MCQUAY Service Guide Book Conversion Table 2.0 CONVERSION TABLE 2.1 Conversion Table Capacity Btu/hr kCal/Hr 0.001 0.252 0.293 x 10 1000 0.293 3.968 0.004 1.162 x 10 3412 3.412 860.04 Pressure W.G. Pascal kg/cm (in.) (ft.) (Pa) 0.07 27.7 2.309 0.69 x 10...

  • Page 5: Product Mainboard Vs Handset Matrix

    MCQUAY Service Guide Book Product Mainboard vs. Handset Matrix 3.0 PRODUCT MAINBOARD VS. HANDSET MATRIX 3.1 Product Mainboard vs. Handset Matrix Main Board 2P2065 Handset R_1_ W_2_ C_2_ Type No. L2.0 VA2.0 VA3.0 Model 69-4 SB125 Standard Optional WM - F Series...
  • Page 6 MCQUAY Service Guide Book Product Mainboard vs. Handset Matrix Type Main Board (IC) Handset MC1.0 LWS2 APM01CB APM02D Standard Optional Model WM – GW Series SLM3+AC5300/Netware 3/SLM8 CK – AW/MWH/CW Series SLM3+AC5300/Netware 3/SLM8 CE – DW Series SLM3+AC5300/Netware 3/SLM8 CW FCU CE –...

  • Page 7: Handset Operating Guide

    MCQUAY Service Guide Book Handset Operating Guide 4.0 HANDSET OPERATING GUIDE 4.1 G6 Operation Guide 1. “ON/OFF” Switch 2. Temperature Setting 5. Timer Setting • Press button to activate the timer setting Press button to increase or decrease (from 1 hour to 15 hour) of the air the set temperature.
  • Page 8 MCQUAY Service Guide Book Handset Operating Guide 4.2 G7 Operation Guide 10. Sleep Mode Setting • This function is available under COOL, 1. Transmission Source HEAT & AUTO mode. • 2. Signal Transmission Indication When it is activated in COOL mode, •...

  • Page 9: G11

    MCQUAY Service Guide Book Handset Operating Guide 4.3 G11 8. Sleep Mode Setting • This function is available under COOL, HEAT and AUTO mode. • When the unit is operating under cooling mode, the set temperature is increased by 0.5°C after 30 minutes, 1°C after an hour, and 2°C after 2 hours.

  • Page 10: G17

    MCQUAY Service Guide Book Handset Operating Guide 4.4 G17 6a. Silent Function (For WM – J Series only) • Press for quiet operation. • Fan speed turn to minimum speed. • Press again to deactivate the function. 6b. Ionizer Function (For WM - G series only) •...

  • Page 11: Gs01

    MCQUAY Service Guide Book Handset Operating Guide 4.5 GS01 Operation Guide Swing mode selection (for CK-E model) • Press SWING button for 4 seconds to 1. Transmission Source enter field setting mode. • While in field setting mode, it will only 2.
  • Page 12 MCQUAY Service Guide Book Handset Operating Guide • Any change of fan speed will deactivate this function. • The Turbo function is unavailable for chilled water system and remote control with SWING MODE function. 8. OFF timer setting 9. Quiet function (model dependant) •...

  • Page 13: Apj1

    MCQUAY Service Guide Book Handset Operating Guide 4.6 APJ1 Operation Guide • 1. Transmission Source To cancel POWERFUL operation, press button again. disappears 2. LCD Display from the LCD. 3. ECONO button 5. Temperature Settings. • ECON operation is a function which enables efficient operation by limiting the 6.
  • Page 14 MCQUAY Service Guide Book Handset Operating Guide • • The flap (horizontal blade) will begin to To cancel OFF TIMER operation, press swing. button. will disappear from the • To set the flap at desired position, press LCD. button when the flap has reached the desired position.

  • Page 15: Slm3

    MCQUAY Service Guide Book Handset Operating Guide 4.7 SLM3 Operation Guide 1. “ ON/OFF” Switch after 30 minutes, 1°C after 1 hour and 2°C after 2 hours. If it is activated under 2. Temperature Setting “HEAT” mode operation, • temperature will be decreased 0.5°C after Setting range are between 16°C to 30°C...

  • Page 16: Slm8

    MCQUAY Service Guide Book Handset Operating Guide 4.8 SLM8 • While in field setting mode, it will only show SWING MODE • Press temperature button select SWING MODE rotation from Swing Mode 1 to Swing Mode 3. • There are 3 different SWING MODE,...
  • Page 17 MCQUAY Service Guide Book Handset Operating Guide • Set Event 1 and Event 2 Timers Press the same key again will increase • Process for Timer ON and Timer OFF is the setting to 2 hours. An indicator the same.

  • Page 18: Sequential Lcd

    MCQUAY Service Guide Book Handset Operating Guide 4.8 Sequential Controller 5. Temperature Setting • To set the desired room temperature, press to increase or decrease the set temperature in the range of 16°C to 30°C. • Press both simultaneously to toggle between °C and °F setting.

  • Page 19: Netware 3/3C

    MCQUAY Service Guide Book Handset Operating Guide 1. Time display 2. Key lock display 3. Error indication 4. Fan speed display 5. Operation mode display 6. Sleep mode display 7. Air swing display 8. Temperature set display Jumper Application 20 - 30 Set temp range : 20°C ~ 30°C...

  • Page 20: Rooftop Panel

    MCQUAY Service Guide Book Handset Operating Guide • • When it is activated in HEAT mode, the This timer can be controlled separately set temperature will be decreased 1°C through remote control as well as ON after 30mins, 2°C after 1 hour and 3°C TIMER or OFF TIMER keys.
  • Page 21 MCQUAY Service Guide Book Handset Operating Guide Operating Guide 1. LCD Display • Upon power up of the unit, the LCD 6. ECS Button displays the main display screen 7. Downward Button • Press the button once to view the...

  • Page 22: Chiller Panel

    MCQUAY Service Guide Book Handset Operating Guide 4.11 Chiller Panel Operating Guide • 1. LCD Display The panel can keep up to 20 faults/alarm • warning records. Upon power up of the unit, the LCD displays the main display screen 6.

  • Page 23: Mc301

    MCQUAY Service Guide Book Handset Operating Guide 4.12 MC301 Operating Guide 1. ON/OFF Operation • 6. Auxiliary Heater Setting Press “ON/OFF” key, the unit will be ON • or OFF, and “ON” or “OFF” will display on Under “HEAT” or “FAN” mode, press the LCD.
  • Page 24 MCQUAY Service Guide Book Handset Operating Guide • 10. Reset Exit timer setting: If there is no press on • This key is used to reset the unit. any key within 5s or press any key except “▲”, “▼”, “TIMER” and “ON/OFF” key, it 11.

  • Page 25: Mc303

    MCQUAY Service Guide Book Handset Operating Guide 4.13 MC303 Operating Guide 1. Address Register • Press the “MODE” button, the current • After communication wire is completely mode is twinkling. Press again to change connected, press “SETUP” key for 5s.
  • Page 26 MCQUAY Service Guide Book Handset Operating Guide • 10. Indoor unit lock/unlock Enter first timer setting, the timer ON or • Press “UNIT No.” key to enter the unit OFF icon will display on the left and bottom of LCD panel, the timer sequence setting, then press “▲”...

  • Page 27: Controller Setting

    MCQUAY Service Guide Book Controller Configuration 5.0 CONTROLLER SETTING 5.1 Auto Random Restart 5.2 Hot Keep Selection • Three selections available: Shorted at JH/JP1/J_LST jumper at main a. Fan stop if indoor coil temperature < 30°C board for auto restart (supplied).
  • Page 28 MCQUAY Service Guide Book Controller Configuration L2 Models L208A / LWS2.0 models Two selections are available: There are 2 tables setting for HT_KP & MODEL jumpers as shown as below. a. Fan ON: - If the indoor coil temperature > 40°C, the indoor fan will run at speed.

  • Page 29: Sequential Board (Sq2.0)

    MCQUAY Service Guide Book Controller Configuration 5.3 Sequential Board (SQ2.0) Dip switch setting of sequential controller are as the following: Dip switch 3 Dip switch 4 a. Default b. 0.5°C c. 1.0°C d. 1.5°C Note: 1.5°C only valid for 2 and 3 compressors model.
  • Page 30 MCQUAY Service Guide Book Controller Configuration 6. Defrost Option Select whether compressor will turn off or remain on when 4WV changes at beginning of defrost cycle. Dip switch 8 a. Compressor off b. Compressor on On (C2.4 spec) 7. Summary of Models available...

  • Page 31: Chilled Water Fan Coil Unit - W1V3

    MCQUAY Service Guide Book Controller Configuration 5.4 Chilled Water Fan Coil Unit (W1V3) The standard W1V3 board comes with a VALVE jumper. The system can be configured as the jumper selection listed below: Model: MCK 20-50AW, MCK 15-25BW, MCK 10-...

  • Page 32: Chilled Water Fan Coil Unit - W2.0

    Valve less √ : Jumper Remained X : Jumper Removed VALVE & HEAT Jumper Location Model: MWM - G2W / 301W Heat 1. VALVE jumper is plugged into JVLV Jumper connector on the emergency switchboard.

  • Page 33: Hardware Setting - Slm8

    MCQUAY Service Guide Book Controller Configuration 5.6 Hardware Setting – SLM8 There are 2 jumpers on SLM8 option to control the board function as shown in Picture below. 20-30C TURBO_ QUIET Summary of Hardware Setting as table below: Jumper Short...

  • Page 34: Conversion Configuration

    MCQUAY Service Guide Book Controller Configuration 6.0 CONVERSION CONFIGURATION 6.1 Auxiliary Heater Conversion U1.5 Heatpump with Auxiliary Heater To convert the standard U1.5 heatpump PCB to 1. Heater relay (240V/20A) auxiliary heater application, following 2. Transistor, 2SC945 components need to be added onto the PCB: 3.
  • Page 35 MCQUAY Service Guide Book Controller Configuration SB125 Heatpump with Auxiliary Heater To convert SB125 heatpump PCB to auxiliary 1. Place the JM Relay (240V/20A) on the heater application, only need to add one heater RY_HTR location relay as shown below: 2.
  • Page 36 MCQUAY Service Guide Book Controller Configuration W2 Heatpump with Auxiliary heater To convert SB125 heatpump PCB to auxiliary 1. Shunt jumper heater application, the following components 2. JM Relay 240VAC/ 20A need to be added onto the PCB: Step 1:- Place the shunt jumper at jumper header M2.

  • Page 37: Multi Split Conversion

    Controller Configuration 6.2 Multi Split Conversion Cooling Only Model (L2.0 / L208A) Heatpump Models (L208A) MWM-G, MCK-A/B/C/E, MCM-E, MCC-C which MCK-AR/BR/CR/ER, MCM-ER, MCC-CR are using L2 control board can be switched to multi split units without any modification needed. The multisplit can be selected by using shunt jumper and short jumper header MODEL_KP between pin 1 &...

  • Page 38: U1.5 L208A Conversion

    MCQUAY Service Guide Book Controller Configuration 6.3 U1.5 L208A Conversion All single split indoor units with U1.5 PCB cannot 1. L2 08A Heat Pump PCB. be directly replaced by the new L208A PCB 2. Room sensor, indoor coil sensor inter-...

  • Page 39: Wmf U1.4 To L2Ef Conversion

    MCQUAY Service Guide Book Controller Configuration 6.4 WMF U1.4 to L2EF Conversion 1. The U1.4 PCB can be replaced directly by the 3. only the display panel or On/Off switch board new L2EF PCB because no modification from U1.4 to L2EF or L2EF to U1.4.

  • Page 40: Sq Board For Wiring Up To 1000M Conversion

    MCQUAY Service Guide Book Controller Configuration 6.5 SQ Board for Wiring up to 1000m Conversion Comparison of Sequential Main Board SQMB01 Before & After conversion: Before IC:MAX1483 J1 removed J2 removed After Work Indication (WI): PART: 2051-MAX1483 IC :MAX1483 Step 1: Remove Jumper J1 and J2.
  • Page 41 MCQUAY Service Guide Book Controller Configuration Sequential LCD conversion for wiring up to 1000m Work Indication (WI): Step 1: Dismantle the BACK cover of Sequential LCD. Step 2: Remove Jumper J1, J2. Step 3: Add Chip Resistor 1/10W 5% 200K to R8, R9 and R10.

  • Page 42: Room Sensor On Netware

    MCQUAY Service Guide Book Controller Configuration 6.6 Room Sensor on Netware 3 There is a temperature sensor located at TH1 on the Netware 3 controller board as shown in the picture below. The temperature sensor is optional and can be used as room sensor, so that room...

  • Page 43: Service Diagnosis

    MCQUAY Service Guide Book Diagnosis 7.0 SERVICE DIAGNOSIS 7.1 LED Lights Diagnosis Table Wall Mounted F Series Cooling Only Model Board Handset MWM 10/15/20/25F, 311 D2.0 MWM 07/10/15/20/25F L2EF POWER SLEEP TIMER Operation / Faulty Action Indication (Green) (Red) (Orange)
  • Page 44 MCQUAY Service Guide Book Diagnosis Wall Mounted F Series Heat Pump Model Board Handset MWM 10/15/20/25FR, 301R U1.5 G7 / SLM3 / Netware 3 / SLM8 MWM 07/10/15/20/25FR, 311/301R L2EF COLD HEAT SLEEP Error Code Operation / (SLM3 / Faulty...
  • Page 45 MCQUAY Service Guide Book Diagnosis Wall Mounted G Series Model Board Handset MWM 10/15/20/25G/GR L2.2 G17 / SLM3 / Netware 3 / SLM8 SLEEP POWER TIMER IONIZER Error Operation / Faulty Code Action Indication (SLM3 / (Red) (Orange) (Green) Netware 3)
  • Page 46 MCQUAY Service Guide Book Diagnosis Wall Mounted J Series Model Board Handset MWM 09/15J/JR L2GSN SLEEP POWER TIMER Error Operation / Faulty Action Code Indication (Red) (Green/Red) (Orange) Cooling mode Green Heating mode Auto mode in heating operation Auto mode in cooling...
  • Page 47 MCQUAY Service Guide Book Diagnosis Ceiling Cassette A / B / C Series Model Model Board Handset MCK 20/25/30/40/50A/AR U1.5 G7 / SLM3 / Netware 3 / SLM8 MCK 15/20/25B/BR U1.5 G7 / SLM3 / Netware 3 / SLM8 MCK 10/15/20C/CR U1.5...
  • Page 48 MCQUAY Service Guide Book Diagnosis Ceiling Cassette A / B / C/ E Series Model Model Board Handset MCK 20/25/30/40/50A/AR L208A G17 / SLM3 / Netware 3 / SLM8 MCK 15/20/25B/BR L208A G17 / SLM3 / Netware 3 / SLM8...
  • Page 49 MCQUAY Service Guide Book Diagnosis Ceiling Exposed D Series Model Model Board Handset MCM 20/25/30/40/50D/DR U1.5 G7 / SLM3 / Netware 3 / SLM8 COOL HEAT Error Code Operation / Faulty (SLM3 / Action Indication Netware 3) (Green) (Orange) (Green)
  • Page 50 MCQUAY Service Guide Book Diagnosis Ceiling Exposed D / E Series Model Model Board Handset MCM 20/25/30/40/50D/DR L208A G17 / SLM3 / Netware 3 / SLM8 MCM 15/20/25/28E/ER L208A G17 / SLM3 / Netware 3 / SLM8 COOL HEAT Error Code...
  • Page 51 MCQUAY Service Guide Book Diagnosis Chilled Water Fan Coil Unit Model Board Handset MWM 05 – 25FW, 301W W1V3 G7 / SLM3 / Netware 3 / SLM8 MCK 20 – 50AW/MWH W1V3 G7 / SLM3 / Netware 3 / SLM8 MCK 15 –...
  • Page 52 MCQUAY Service Guide Book Diagnosis Water Source Split Unit – Wall Mounted G Series Model Model Board Handset M5WMWS 10/15/20/25GR LWS2.0 G17 / SLM3 / Netware 3 / SLM8 SLEEP POWER TIMER IONIZER Error Code Operation / Faulty (SLM3 /...
  • Page 53 MCQUAY Service Guide Book Diagnosis Water Source Split Unit – Ceiling Cassette A / B / C Series Model Model Board Handset M5CKWS 20/25/30/40/50AR LWS2.0 G17 / SLM3 / Netware 3 / SLM8 M5CKWS 10/15/20CR LWS2.0 G17 / SLM3 / Netware 3 / SLM8...
  • Page 54 MCQUAY Service Guide Book Diagnosis Wall Mounted F Cooling Only Inverter-X Model Model Board Handset MWMX 10/15F VA2.0 G17 / SLM3 TIMER SLEEP POWER Error Operation / Faulty Code Action Indication (SLM3) (Orange) (Red) (Green) (Orange) Timer On Sleep mode On...
  • Page 55 MCQUAY Service Guide Book Diagnosis Wall Mounted F Heatpump Inverter-X Model Model Board Handset MWMX 10/15FR VA2.0 G17 / SLM3 STAND- Error COOL/DRY HEAT BY/FAN TIMER Operation / Faulty Code Action Indication (SLM3) (Green) (Red) (Orange) (Orange) Cooling mode Dry mode...
  • Page 56 MCQUAY Service Guide Book Diagnosis Wall Mounted G Series Inverter-X Model Model Board Handset MWMX 10/15/20/25G/GR VA2.0 G17 / SLM3 SLEEP POWER TIMER IONIZER Error Operation / Faulty Code Action Indication (SLM3) (Red) (Orange) (Green) (Green/Red) Cooling mode Heating mode / Standby...
  • Page 57 MCQUAY Service Guide Book Diagnosis Ceiling Cassette A/C Series Inverter-X Model Model Board Handset MCKX 20/25A/AR VA3.0 G17 / SLM3 MCKX 10/15/20C/CR VA3.0 G17 / SLM3 POWER TIMER SLEEP HEAT Error Operation / Faulty Code Action Indication (SLM3) (Green) (Orange)
  • Page 58 MCQUAY Service Guide Book Diagnosis Ceiling Convertible E Series Inverter-X Model Model Board Handset MCMX 15/20/25E/ER VA3.0 G17 / SLM3 COOL HEAT Error Operation / Faulty Code Action Indication (SLM3) (Green) (Orange) (Green) (Red) Cooling mode Dry mode Fan mode...
  • Page 59 MCQUAY Service Guide Book Diagnosis Inverter - X Outdoor Unit Model Board MLCX 10/15/20/25C/CR VB2.0 MMSV 25/35A VB2.0 AMSX 20/25/30A/AR VB2.0 Normal running / compressor running RED LED blinking No. of Blinks Blinking Indication Normal running, with no limitation Voltage limit...
  • Page 60 MCQUAY Service Guide Book Diagnosis Inverter-Y Model Indoor Series Model Board Handset M5WMY 10/15/20/25 JR W_2_03A GS01 / G17 M5CKY 10/15/20CR C_2_01A GS01 / G17 / Netware 3C M5CKY 20/25/28/40/50 ER C_2_01A GS01 / G17 / Netware 3C A5CMY 62 CR...
  • Page 61 MCQUAY Service Guide Book Diagnosis Single Split Inverter – Y Outdoor Unit Model Board M5LCY 10/15 DR S_2_03A M5LCY 20/25 CR S_2_04A M5LCY 30/40/50/60 FR Error code diagnosis by Outdoor 7-segment Display In the Y-series model, the 7-segment display section on the outdoor unit indicates the following: 1.
  • Page 62 MCQUAY Service Guide Book Diagnosis Multi Split Inverter – Y Outdoor Unit Model Board M5MSY 20/25/30 BR The outdoor unit LED indicates the running condition of the system: LED INDICATION Green Description NORMAL ● ● ● ● INSTALLATION ERROR ANTIFREEZE (OTHER ROOMS) HEAT SINK OVERHEAT ●...

  • Page 63: Error Codes Diagnosis By Handset

    MCQUAY Service Guide Book Diagnosis 7.2 Error Codes Diagnosis By Handset SLM 3 / Netware 3 / SLM 9 – On/Off Models Error Code Faulty Indication Room air sensor contact loose / short Indoor coil sensor contact open Outdoor coil sensor contact open...
  • Page 64 MCQUAY Service Guide Book Diagnosis Netware 3C / SLM 9 – Inverter Y Models (Except 5WMY-J/JR) Error Error Faulty Indication Faulty Indication Code Code Normal Outdoor air thermistor short/open Indoor PCB error Pressure sensor error Compressor discharge pipe thermistor Drain pump fault...
  • Page 65 MCQUAY Service Guide Book Diagnosis Sequential Controller (SQ LCD) – SB & RT Multi Compressors Error Error Faulty Indication Faulty Indication Code Code Require manual reset (possible causes) Indoor coil sensor 4 short Compressor 1 high temperature (overload) Indoor coil sensor 1 open...
  • Page 66 MCQUAY Service Guide Book Diagnosis Rooftop Panel Alarm Shown On The Rooftop Panel • Whenever panel received a new alarm, an alarm message will pop up on the LCD. It shows type of alarm, alarm occurred time and date. Backlight blinking (if Backlight is not OFF) and alarms buzzer produces beeping sound (if it’s set ON).
  • Page 67 MCQUAY Service Guide Book Diagnosis Condenser fan motor faulty Replace fan motor. Main PCB faulty Replace main PCB. 9. Disconnection of Poor sensor connection Connect correctly and operate again. discharge thermistor 1 / 2 10. Heat Exchanger 1 / 2...
  • Page 68 MCQUAY Service Guide Book Diagnosis Chiller Panel – Air Cooled Mini Chiller When malfunctioning occurred, the display LCD will blink. The display will show the faulty parameter and the date and time of the occurrence. When a malfunction of the unit is detected, immediately switch off the main power supply before...
  • Page 69 MCQUAY Service Guide Book Diagnosis G17 – Inverter Y Models Temperature Display Section MODE Button TIMER CANCEL Button OFF TIMER Button Diagnosis Step 1. Hold down TIMER CANCEL button for 5 seconds, a “ ” indication flashes on the temperature display section.
  • Page 70 MCQUAY Service Guide Book Diagnosis GS01 – Inverter Y Models Diagnosis Step 1. Hold down ON TIMER CANCEL button or OFF TIMER CANCEL button for 5 seconds, a “ ” indication flashes on the temperature display section. 2. Press TIMER CANCEL repeatedly until indoor buzzer produces a long beep. This indicates the error code, refers to Error Codes table and is displayed on the temperature display section.
  • Page 71 MCQUAY Service Guide Book Diagnosis Error Codes for G17 and GS01 – Inverter Y Models Error Error Error Description Error Description Codes Codes Normal Discharge pipe overheat Insufficient gas Heat exchanger overheat DC voltage out of range Compressor sensor system abnormality...
  • Page 72 MCQUAY Service Guide Book Diagnosis APJ1 –M5WMY10/15KR Indoor LED Indication Timer Cancel The operation lamp (green) flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation.

  • Page 73: Mds Diagnosis

    MCQUAY Service Guide Book Diagnosis 7.3 MDS Diagnosis (A)Indoor Units Model Board Handset A(5)WMD 09/10/15/20/25 G MC201-C A(5)CKD 20/25/30/40/50 A MC201-C A(5)CKD 10/15/20 C MC201-C A(5)CMD 20/25/28 E MC201-C A(5)CMD 40/50 D MC201-C A(5)CMD 62 C MC201-C A(5)CCD 10/15/20/25/30/40/50/60 C...
  • Page 74 MCQUAY Service Guide Book Diagnosis Error Diagnosis by Wired Controller (MC301) ITEM CODE DESCRIPTION Sensor Broken (indoor outlet coil) Sensor Broken (indoor return air) Sensor Broken (indoor supply air) Indoor and controller communication malfunction Ambient temp exceed the limit 4WV malfunction...
  • Page 75 MCQUAY Service Guide Book Diagnosis (B) Outdoor Units Model Board Handset MDS 30/40/50/60/70 A/AR V4.0 – V4.5 G17/ MC301 MDS 80/100/120/150/180/200/240/ V2.0 – V2.7 G17/ MC301 260/300/320 B/BR 5MDS 80/100/120/140/160/180/ 200/220/240/260/280/300/320/340/360 V2.1A – V2.6A G17/ MC301 /380/400/420/440/460/480/500 B/BR Error code diagnosis by PCB four Digit 7-Segment...

  • Page 76: General Check

    MCQUAY Service Guide Book Diagnosis 7.4 General Check When any air conditioner malfunction is noted, immediately switch off the power supply to the unit and contact the local dealer if necessary. Problem Symptom Check Item Suggested Action The unit does not...

  • Page 77: General Troubleshooting Guide

    MCQUAY Service Guide Book Diagnosis 7.5 General Troubleshooting Guide By means of pressure readings: Pressure Probable Cause Data Circuit 1. Overcharged with refrigerant. High Side 2. Non-condensable gases in refrigerant Low Side circuit (eg. Oil) 3. Obstructed air-intake / discharge.

  • Page 78: Appendix

    MCQUAY Service Guide Book Appendix APPENDIX A. Resistance – Temperature Characteristics Model ALL ON/OFF UNIT, FAN COIL UNIT Resistance R25=10.0kΩ + 1.0% - 1.0% B Value B25/30=3450K + 1.0% - 1.0% T°C Rmin (kΩ) Rnom (kΩ) Rmax (kΩ) T°C Rmin (kΩ) Rnom (kΩ)
  • Page 79 MCQUAY Service Guide Book Appendix Model M5WMY10/15KR; M5LCY10/15ER; M5LCY30/40/50/60FR Resistance R25=20.0kΩ + 1.0% - 1.0% T°C A (kΩ) B (kΩ) T°C A (kΩ) B (kΩ) T°C A (kΩ) B (kΩ) 197.81 192.08 25.01 24.45 4.96 4.87 189.53 181.16 23.91 23.37 4.79...
  • Page 80 MCQUAY Service Guide Book Appendix Model M5LCY30/40/50/60FR Discharge Pipe Sensor Resistance R25=230.0kΩ + 1.0% - 1.0% Resistance Resistance Resistance Resistance T°C T°C T°C T°C (kΩ) (kΩ) (kΩ) (kΩ) 1120.0 109.0 18.1 1002.5 100.2 16.9 898.6 92.2 15.8 806.5 84.9 14.8 724.8...

  • Page 81: Mds Compatibility

    MCQUAY Service Guide Book Appendix B. MDS Compatibility Indoor PCB vs Wired Handset MC301 MC301 B1.5 B1.6 B.17 B1.8 B1.9 B2.0 B2.1 Indoor mc201_2.0 mc201_2.1 mc201_2.2 mc201_2.3 mc201_2.4 mc201_2.5 mc201_2.6 mc201_2.7 Indoor PCB vs Outdoor PCB MDS-A/B 7HP and Below:...

  • Page 82: Mds Outdoor Capacity Dip Switch Setting

    MCQUAY Service Guide Book Appendix C. MDS Outdoor Capacity Dip Switch Setting MDS-B PCB version 2.3 and below: Dip Switch S3.1 S3.2 S3.3 S3.4 10HP 12HP 15HP 18HP 20HP 22HP 26HP 28HP 32HP MDS-B PCB version 2.4 and above: Dip Switch S2.3...

  • Page 83: Cable Length Of Wired Handset

    MCQUAY Service Guide Book Appendix D. Cable Length of Wired Handset Cable Length (m) Wired Handset Cable Type Standard Optional Maximum UL2547 SLM 3 2.2m, 7m 10m, 15m AWG26 UL2547 Netware 3 AWG26 UL2547 Netware 3C AWG26 UL2547 SQ-LCD Not Provided...
  • Page 84 ©2012 McQuay International www.mcquayup.com...

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