McQuay MDS Series Service Manual
  1. Manuals
  2. Brands
  3. McQuay Manuals
  4. Compressor
  5. MDS Series
  6. Service manual
McQuay MDS Series Service Manual

McQuay MDS Series Service Manual

Multi digital scroll system
Hide thumbs
Table of Contents

Advertisement

Quick Links

SM-MDS_(ii)
Service Manual
M
u
l
t
i
D
i
g
i
t
a
l
S
c
r
o
l
l
S
y
s
t
e
m
M
u
l
t
i
D
i
g
i
t
a
l
S
c
r
o
l
l
S
y
s
t
e
m
Engineered for flexibility and performance
TM

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MDS Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for McQuay MDS Series

Summary of Contents for McQuay MDS Series

  • Page 1 SM-MDS_(ii) Service Manual Engineered for flexibility and performance...
  • Page 3 Individual applications and site variations can significantly affect the results and effectiveness of any information, the reader must satisfy him/herself regarding the applicability of any article and seek professional evaluation of all materials. McQuay disclaims any responsibility for actions based on this document.

  • Page 4: Table Of Contents

    Table of Content Preface…………………………………………………………………………..…………………….iv 1.0 Introduction………………………………………………………………………………………..1 1.1 Digital Scroll Compressor………………………………………………………..………..1 1.2 Operating Range…………………………………………………………………………..2 1.3 Basic Layout of MDS System…………………………………………………………….3 1.4 Maximum Connectible Indoor…………………………………………………………..3 1.5 Maximum Piping Length…………………………………………………………………..4 1.6 Refnet and Distributor……………………………………………………………………..4 1.7 EXV Box………………………………………………………………………………….…6 2.0 System and Control………………………………………………………………………………..7 2.1 MDS Outdoor System and Control………………………………………………………7 2.2 MDS Indoor System and Control……………………………………………………….10 2.3 MDS System Piping Connection………………………………………………………..11 2.4 Heater Control…………………………………………………………………………….12...
  • Page 5 5.0 Commissioning……………………………………………………………………………………45 5.1 Obtain Design Drawing and Report…………………………………………………….46 5.2 Check Piping Routing, Wiring Routing & Connection………………………………...46 5.3 Add in Additional Refrigerant……………………………………………………………47 5.4 Confirm Indoor Dipswitch Setting……………………………………………………….48 5.5 Power Up All Indoor……………………………………………………………………...50 5.6 Confirm Outdoor Dipswitch Setting…………………………………………………….52 5.6.1 Setting Up MDOM PCB………………………………………………………..52 5.6.2 Setting Up MDS-M PCB……………………………………………………….55 5.7 Power Up Outdoor………………………………………………………………………..57 5.8 Start All Indoors…………………………………………………………………………..59...

  • Page 6: Preface

    Preface This manual provides a guideline for service personnel to perform start-up/commissioning on the MDS system. Besides providing the details on the system wiring method, termination connection and PCB setting, this manual also consists of information and working instruction on the Smart Commander Service Version. This service manual contains all the information needed (such as complete list of error code with troubleshooting flow chart for possible root cause) to do necessary repair, maintenance and troubleshooting task for the MDS air conditioner system.

  • Page 7: Introduction

    1.0 Introduction 1.1 Digital Scroll Compressor MDS system is utilizing the digital scroll compressor technology to modulate its supply capacity to meet most indoors requirement closely. MDS system offers in both R22 and R410A refrigerant, the product line up, together with number of compressors in one outdoor unit is as follow: Compressor Quantity Model...

  • Page 8: Operating Range

    Valve Digital Scroll Compressor Fix Scroll Compressor Digital Scroll Compressor can be easily identified by the presence of PWM valve. On the other hand, Fix Scroll Compressors do not have any PWM valve for modulation purpose. The combination of Digital and Fix Scroll Compressor work according to the following principle: Total Capacity Required...

  • Page 9: Basic Layout Of Mds System

    1.3 Basic Layout of MDS System Generally, MDS system consists of outdoor unit, indoor unit, refnet or distributor and EXV box. 1.4 Maximum Connectable Indoor MDS system is very flexible and versatile as one outdoor unit can be connected to multiple indoor units. The table below shows the maximum connectable indoor units for each outdoor: R22 Model R410A Model...

  • Page 10: Maximum Piping Length

    1.5 Maximum Piping Length The presence of sub-cooling circuit within MDS system has allowed the system to qualify for long piping application. Besides that, MDS system is designed to ease oil return to the compressor and this has further improved the maximum connectable piping length for each system. R-22 R-410A Length (m)
  • Page 11 Dimension of refnet model MDS-Y5-A, MDS-Y6-A and MDS-Y7-A Distributor MDS-C1 Distributor MDS-C2 and MDS-C3 Service Manual SM-MDS_(ii)

  • Page 12: Exv Box

    1.7 EXV Box (MEX) For MDS system, every indoor has an individual EXV box which will control and regulate the refrigerant flow. Different indoor unit has different pipe size, therefore different EXV box model. Indoor models offered, together with their pipe diameter and respective EXV box model are shown in the table below: Liquid Pipe Diameter (Inch) MEX Model Indoor Model...

  • Page 13: System And Control

    2.0 System and Control 2.1 MDS Outdoor System and Control General Circuit Diagram General outdoor circuit diagram for cooling mode General outdoor circuit diagram for heating mode Note: For more detailed refrigerant circuit diagram, please refer to Appendix 7.13. Service Manual SM-MDS_(ii)
  • Page 14 Piping and Components Layout General layout of MDS system piping and components PWM Valve PWM (Pulse Width Modulation) valve is an ON/OFF valve. When signal is send from Control outdoor PCB, the pulse voltage will react on the coil and generate a rotating magnetic field. This will allow the rotor to drives the valve to move up or down and hence opening or closing the valve.
  • Page 15 Fan Speed Control Outdoor fan speed control (cooling mode) Outdoor fan speed control (heating mode) Protection MDS system has several sensor and pressure switch for protection purpose:  Devices Discharge pressure protection (switch)  Suction pressure protection (sensor)  Discharge temperature protection for Digital Scroll Compressor ...

  • Page 16: Mds Indoor System And Control

    2.2 MDS Indoor System and Control Sensor Location Indoor coil sensors’ location and naming for cooling (left) and heating (right) The indoor unit for MDS system is slightly different with indoor unit of ordinary split system. For MDS indoor, there are additional sensors which allow precision control over temperature.

  • Page 17: Mds System Piping Connection

    2.3 MDS System Piping Connection MDS system provides multiple indoor unit installation through refnet and distributor connection. However, there are some limitations where installer should take note. Refer to the figures below, after the installation of distributor, the piping should directly connect to indoor unit and cannot be connected to other refnet or distributor. This is to prevent uneven refrigerant flow through the system and causing the system to become unbalance and affecting its performance.

  • Page 18: Heater Control

    2.4 Heater Control There is an optional heater for MDS indoor unit. However, this option is only applicable for ducted model (using wired controller) and it will function during heating cycle or fan mode. (Please refer to page 48 for dipswitch setting on heater application).

  • Page 19: Outdoor Ball Valve Operation

    2.5 Outdoor Ball Valve Operation Other than installer, service personnel are often required to operate the ball valve during service and maintenance work. Ball valves operation steps are as follow: 1. Operate the gas side ball valve  Uninstall the flange connector: remove the flange connector from the piping ...

  • Page 20: Pcb, Handset And Wiring

    3.0 PCB & Wiring 3.1 MDS Outdoor Unit PCB There are two types of PCB for MDS outdoor unit, namely MDOM PCB and MDS-M PCB. MDOM PCB Remark: PWM - Pulse Width Modulation NEUTRAL 4WV - Four way valve TRAN-H DIG - Digital compressor TRAN-L FIX - Fix compressor...
  • Page 21 MDS-M PCB Remark: 7 Segment LED Display FX1-OL - Fix compressor overload Reset Button DIG-OL - Digital compressor overload PCB Software Version LP - Low pressure switch MDS-M PCB HP - High pressure switch & B (To indoor) N - Neutral &...

  • Page 22: Mds Indoor Unit Pcb

    3.2 MDS Indoor Unit PCB There are two types of PCB for MDS indoor unit, namely MC200-C and MC201-C. MC200-C Remark: NEUTRAL Fan Motor - HI FAN, MI FAN, LO FAN LIVE T_IN - Inlet coil temperature Dipswitch 1 (SW1) T_MID - Midlet coil temperature Dipswitch 4 (SW4) T_OUT - Outlet coil temperature...
  • Page 23 MC201-C Remark: Steping Motor Dipswitch 3 (SW3) EXV2 Dipswitch 4 (SW4) EXV1 Dipswitch 1 (SW1) & B (Centralize Control) Dipswitch 2 (SW2) & B (Outdoor Communication) MC201-C PCB T_Room - Room temperature PCB Software Version T_IN - Inlet coil temperature Swing T_MID - Midlet coil temperature Pump...

  • Page 24: Mds System Wiring

    3.3 MDS System Wiring The wiring for MDS is very critical as MDS is a system by itself. Generally, the wiring connection can be divided into wiring connection between MDS outdoor to indoor units, wiring connection between MDS outdoor units and wiring connection between MDS master and slave unit.
  • Page 25 MDOM PCB For MDOM PCB, the communication terminals are already wired from the PCB to terminal block. Connect the wire accordingly (A outdoor to A indoor, B outdoor to B indoor) on the green color connector on indoor PCB. MDS-M PCB For MDS-M PCB, the communication terminals are also wired from the PCB to terminal block.

  • Page 26: Wiring Connection Between Mds Outdoor Units

    For the last indoor unit, the communication jumper needs to be shorted. This is to indicate to the outdoor unit that this is the last indoor unit. If the jumper is not shorted, the communication between the outdoor and indoor is not stable.

  • Page 27: Wiring Connection Between Mds Master And Slave Unit

    3.3.3 Wiring Connection Between MDS Master and Slave Unit Master Slave For master & slave model, the communication connection is slightly different. From the master unit A & B , the communication wiring need to connect to the salve unit A &...

  • Page 28: Wireless Handset

    3.4.1 Wireless Handset G17 1. Transmission Source 2. Signal Transmission Indication  Blink to confirm that the last setting has been transmitted to the unit. 3. Temperature Setting  Temperature setting range is from 16° C to 30° C (optional setting 20° C to 30° C). 4.
  • Page 29 10. “ON/OFF” Button 11. Timer Cancel 12. OFF Timer Setting 13. ON Timer Setting 14. Turbo Function  Press for fast cooling.  Fan speed turn to maximum speed.  Press again to deactivate the function. 15. Clock Time Setting ...

  • Page 30: Wired Controller Mc301

    3.4.2 Wired Controller MC301 1. ON/OFF Operation  Press “ON/OFF” key, the unit will be ON or OFF, and “ON” or “OFF” will display on the LCD. 2. Temperature Setting  Use “▲” or “▼” keyboard to increase or decrease by 1 °C/°F, temperature range is 16-30 ° C (61-86° F). ...
  • Page 31 9. Real Time Clock Setting  Press “CLK” to enter, firstly is “week setting”; press “▲” or “▼” to change from Sunday to Saturday. If there is no any press for 5s on any key, it will exit to the displaying status. Press “CLK”...

  • Page 32: Central Controller Mc303

    3.4.3 Central Controller MC303 1. Address Register  After communication wire is completely connected, press “SETUP” key for 5s. Address will be automatically registered and a number from 60 to 0 will be shown on the display LCD. 2. View Actual Address ...
  • Page 33 8. Swing Setting  Press “SWING” key to active swing function. “SWING” will display on LCD. 9. Sleep Setting  Press “SLEEP” key, “SLEEP” will display on LCD, which means this function is active. 10. Indoor unit lock/unlock  Press “UNIT No.” key to enter the unit setting, then press “▲” or “▼” to choose the unit number to be set or choose “_ _”...

  • Page 34: Handsets Wiring

    3.4.4 Handsets Wiring For Central Controller MC303, wiring work is needed between indoor units and the controller for communication purpose. The communication wire used should comply with UL2547 or UL2791 standard (refer to Section 3.3, page 18). Communication wire is wired from the controller to indoor units (through the orange connector, A ) through daisy chain connection.

  • Page 35: Smart Commander

    4.0 Commissioning Software 4.1 Introduction Smart Commander is the MDS software use to perform commissioning and troubleshooting of MDS system. It is recommended that service personnel to use this software while commissioning MDS system. Inside the commissioning kit from factory, it consists of a CD (Smart Commander Service Version), a USB Dongle Key (Purple), a MC501 gateway with power connection, a cable connected from the gateway to serial port and a manual.
  • Page 36 Step 2: To set up the USB Dongle Key driver, the user is required to initiate the setup file in Install USB Dongle the SPI730 folder, which is located inside the Key_driver folder. Key Driver After initiated the setup file, just follow through the instruction on the prompt up screen to install the driver.

  • Page 37: Wiring Connection

    4.4 Wiring Connection MC501 gateway acts as a bridge in converting and transmitting signals and allows communication between computer and MDS system. The wiring connection is basically divided into two sections: a) Wiring connection between outdoor and gateway (length must <1000m between last outdoor and gateway) b) Wiring connection between gateway and computer (length must <2m) For wiring connection between outdoor and gateway, the communication cable is directly connected from outdoor terminal to the gateway, where A...
  • Page 38 Wiring connection for MDS system with more than one outdoor unit For wiring connection between MC501 gateway and computer, it can be done by using the cable provided to connect the gateway to serial port of computer. If serial port is not available in the computer, a RS232 (Serial Port) to USB converter cable can be use.

  • Page 39: Setup Of Smart Commander

    4.5 Setup of Smart Commander After completing the wiring connection for MC501 gateway, setup process continue to determine the communication port which will be sending and receiving signals between computer and gateway. If you are using the serial port cable provided from factory, you may jump straight to step 6 and set COM 1 as your port number. If you are using the Serial port to USB converter cable, please go through all the following steps.
  • Page 40 Step 4 A new window will prompt out, showing the list of hardware which is available in your PC. User will need to expand the Port (COM & LPT) to locate the communication port. From the example below, the USB to RS232 or Serial Port is COM3. Please note that the communication port (COM) on each laptop will be different.
  • Page 41 Step 6 Go to Start, ALL Programs, Smart Commander, Smart Commander_EN to launch the Smart Commander program. The path to execute the Smart Commander program may vary depends on the installation location and version of Smart Commander. Step 7 Once the software is finished initiated, the user will need to set the COM port setting. To do this, please go to Function(E) and select Parameter Setting.
  • Page 42 Step 9 After the setting of COM port is completed, the user can connect to the system. Go to drop down menu Function (E) again and select Initiating to connect to the MDS system. Once the software is connected to the system, all available parameter of the system (Indoor and Outdoor) will be visible.

  • Page 43: Smart Commander Software Interface

    4.6 Smart Commander Software Interface Smart Commander Service version has two different windows. The first window is named Circuit Monitor. User is allows to control and monitor the indoor and outdoor parameter under this windows. The Server Monitor window allows user to plot graph using the data already obtain when the Smart Commander is connected to the MDS system.
  • Page 44 i) Outdoor Unit Monitoring Items that can be monitor on an outdoor unit are as follow: Item Display Identity : Type of model: Single / Master / Slave Mode : Operating Mode: Cooling / Heating / Defrost Edition : The program version of the outdoor : Outdoor Capacity (Unit: HP) Outdoor unit superheat (Unit: °...
  • Page 45 ii) Outdoor Refrigerant Diagram Outdoor address Outdoor Model Red Line: Heating Sensor location Green Line: Cooling / Dry Black Line: Stop This allows the user to understand the refrigerant circuit within the outdoor unit. The different colors on the refrigerant line indicate the type of mode the outdoor unit is operating. It also shows the sensors location which helps if the user cannot remember the function of the sensor shows in the outdoor unit monitoring chart.
  • Page 46 Indoor Address Location Take note that only 8 indoor units can be shown in the circuit monitor page. There are three ways to scroll to other unit if it is not shown in the screen:  Click on the Up / Down button, the indoor unit will ascend or descend accordingly. ...

  • Page 47: Service Monitor

    4.6.2 Service Monitor Service monitor interface is used to plot graph by using the MDS system parameter. By viewing the graph, it will provide observation on the system operation condition. Total 5 parameters (outdoor or indoors) can be selected. Service Monitor Window in Smart Commander There are 6 function buttons at the bottom of Service Monitor screen.

  • Page 48: Additional Function

    4.6.3 Additional Function Unit setting may be modified by clicking Modify Outdoor Unit Parameter under Circuit Monitor screen. It is advisable not to change any data unless under the instruction from the factory side. The default value set had been decided after numerous testing conducted by R&D and should be suitable for most condition. A new window will prompt out when the user click on the Modify Outdoor Unit Parameter button in circuit monitor page.
  • Page 49  Defrost Finish Temperature: The defrost cycle will stop once TH9 exceed this set point. The lower the temperature, the faster the defrost cycle will end. The allowable range is from 10° C to 50° C (Default value for (5)MDS80-240B/BR is 15° C for (5)MDS260-500B/BR is 18° C). ...
  • Page 50  Connection Param 1: Not applicable (for future provision).  Connection Param 2: Refers to compensation for long piping application. Default setting is 10 (Setting range from 10 to 50). It is used to increase capacity of outdoor during low load condition (only a few indoors are turned ON).

  • Page 51: Commissioning

    5.0 Commissioning In order to commission MDS, there are some necessary steps to follow. These steps help to streamline the possible problem that may occur during commissioning. The flow chart below provides a general guide line for commissioning MDS system. This is useful whether for first timer as reference or experience technicians / engineers as check list.

  • Page 52: Obtain Design Drawing And Report

    5.1 Obtain Design Drawing and Report During the design of MDS system by using the selection software, the user will draw the equipment layout on the software workplace. After completed the drawing, the software will select the appropriate outdoor model base on the user requirement.

  • Page 53: Add In Additional Refrigerant

    5.3 Add in additional refrigerant Even though the MDS outdoor unit is pre-charged with refrigerant from the factory, but additional refrigerant is still required. This is because the pre-charge of refrigerant from the factory may not be sufficient to ensure the whole system to work according to design condition due to different piping length.

  • Page 54: Confirm Indoor Dipswitch Setting

    5.4 Confirm Indoor Dipswitch Setting For MDS system, every unit is assigned with an address for communication and signal transmission purpose. Both indoor and outdoor unit address need to be set manually through the dipswitch located on the PCB. Other than address, other setting such as unit model and capacity are also set through the dipswitch.
  • Page 55 Dipswitch 2 (SW2) OFF (0) OFF (0) 1 2 3 4 5 6 1 2 3 4 5 6 Address Address Dipswitch 2 is for address setting. Each indoor unit within the same outdoor unit must have different address. The table below shows the indoor address setting. S2.1 S2.2 S2.3...

  • Page 56: Power Up All Indoor

    Dipswitch 3 (SW3) OFF (0) 1 2 3 4 5 6 7 8 Capacity Model Dipswitch 3 is for model and capacity setting. It is advisable that the commissioner to check all the indoors during every commissioning. The tables below show the respective setting for indoor type and indoor capacity.
  • Page 57 Auto-Random ON – °F Restart for OFF – °C Wired Controller (MC301) Not applicable. Reserved for future. ON– Wired handset with real time clock (come as standard) OFF – Wired handset without real time clock ON– Auto restart ON OFF – Auto restart OFF For wired handset (MC301), there are 4 dipswitches on the back of the PCB.

  • Page 58: Confirm Outdoor Dipswitch Setting

    5.6 Confirm Outdoor Dipswitch Setting Similar to indoor, there are also some settings need to be done for outdoor unit. The unit capacity and model type are usually set before ship out from the factory. However, it is advisable to check on the dipswitch again before power up the outdoor.
  • Page 59 Set up Dipswitch 2 (J2) For dipswitch 2, there are 2 main functions. The first will be the type of model (J2.6) and the second will be the outdoor address setting (J2.1 to J2.5). Dipswitch J2.7 is for refrigerant type and J2.8 is reserved for future provision.
  • Page 60 Set up To set up indoor quantity, you will need to utilize the K2 and K1 button (refer to page 14) and Indoor follow the procedure below: Quantity 1. Power up the outdoor. 2. Press K2 for 5 second to enter parameter setting mode. The 7 segments LED display will show [- - - -].

  • Page 61: Setting Up Mds-M Pcb

    5.6.2 Setting Up MDS-M PCB Setting up MDS-M PCB is simpler and requires 3 steps as well: 1. Set up dipswitch 1 (S1) 2. Set up dipswitch 2 (S2) 3. Set up dipswitch 3 (S3) Please refer to page 15 for the location of the dipswitches. Set up ON (1) Dipswitch 1...
  • Page 62 Set up ON (1) ON (1) Dipswitch 2 OFF (0) OFF (0) (S2) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Outdoor address Outdoor address Outdoor Capacity Outdoor Capacity Reserved Reserved Master / Slave Master / Slave For Dipswitch 2, the main function is to set the outdoor address if the outdoor is connected in a network of outdoors or Central Wired Controller (MC303).

  • Page 63: Power Up Outdoor

    Set up Dipswitch 3 (S3) OFF (0) OFF (0) 1 2 3 4 1 2 3 4 Outdoor unit capacity Outdoor unit capacity For Dipswitch S3, the main function is to determine the MDS-B series outdoor capacity. Besides this dipswitch, dipswitch S2.3 is also interrelated. The setting of the capacity is as follow: 5.7 Power Up Outdoor After the outdoor unit setting has completed, we may power up the outdoor unit to see if the wiring connection is correct.
  • Page 64 If commissioning software is not available, commissioner may manually check the MDS system by observing the parameter shown on the 7 segment LED display which is located on the outdoor PCB. During this time, we need to check and observe the system to ensure it is running normally without any error. The 7 segment LED display located on the outdoor PCB will display related information such as running parameters and error code (if any).

  • Page 65: Start All Indoors

    5.8 Start All Indoors After confirming that the MDS system is ready in standby mode without any faulty operation or error code, turn on all indoor units one by one. This can be done through the commissioning software or manually turn on each indoor unit individually.

  • Page 66: Troubleshooting

    6.0 Troubleshooting 6.1 Locating Error Code Error code will show on both indoor and outdoor units when the system malfunctions. For decorative type indoor such as wall mounted, ceiling cassette and ceiling convertible, the error code will display via the blinking of the LED.

  • Page 67: Error Code For Decorative Type Indoor

    6.2 Error Code for Decorative Type Indoor Page Error Code #1 Cool/Heat Sleep/Fan Dry/Timer BLINKING Description Communication error  Indoor and outdoor communication wire broken Possible causes  Indoor and outdoor communication wire loose  Indoor and outdoor communication wire A and B reversed ...
  • Page 68 Error Code #6 Cool/Heat Sleep/Fan Time/Dry BLINKING BLINKING Description High/low pressure switch trip  High pressure trip Possible causes - outdoor unit motor broken - outdoor circulating air short (cooling) - outdoor heat exchanger too dirty (cooling) - outdoor ball valve not open - indoor circulating air short (heating) - indoor heat exchanger too dirty (heating) - indoor unit filter web blocked (heating)

  • Page 69: Indoor Error Code For Wired Controller Mc301

    6.3 Indoor Error Code for Wired Controller MC301 Error Description Possible Causes Page Code  System malfunction High pressure malfunction occur 3 times within 1 hour - outdoor unit motor broken (cooling) - outdoor circulating air short (cooling) - outdoor heat exchanger too dirty (cooling) - outdoor ball valve not open - indoor circulating air short (heating) - indoor heat exchanger too dirty (heating)
  • Page 70  TH12 open/short circuit Outdoor suction temperature sensor TH12 broken or loose (suction)  Emergency run On the premise that part of the indoor unit communication malfunction and either one (or both) of the following error occurs (unit will shut down): System sub heat <1º...
  • Page 71  Master unit and slave Master unit and slave unit communication wire reversed unit communication  Master unit and slave unit communication wire broken or loose malfunction  Slave unit toggle switch set wrongly  Master and slave unit PCB version conflict / different ...
  • Page 72  Low pressure sensor Low pressure sensor connecting wire broken broken  Outdoor PCB LS port broken  Indoor and outdoor Outdoor work normal, but all indoor communication abnormal communication  System malfunction Slave unit high pressure malfunction occurred 3 times (slave unit) ...
  • Page 73  Ambient temperature is Ambient temperature is out of operation limit range out of operation limit Cooling ambient temperature range: 0º C – 43º C range (slave unit) Heating ambient temperature range: -15º C – 16º C  Outdoor slave unit circulating air short-circuit Result in ambient temperature raising to exceed operation limit range when cooling Result in ambient temperature falling down to exceed operation limit range when heating...

  • Page 74: Outdoor Error Code For Mdom Pcb

    6.4 Outdoor Error Code for MDOM PCB Error Description Possible Causes Page Code  Communication failure Indoor and outdoor communication wire broken between outdoor and all  Indoor and outdoor communication wire loose indoor  Indoor and outdoor communication wire A and B reversed ...
  • Page 75  General system failure High pressure malfunction occur 3 times within 1 hour - outdoor unit motor broken (cooling) - outdoor circulating air short (cooling) - outdoor heat exchanger too dirty (cooling) - outdoor ball valve not open - indoor circulating air short (heating) - indoor heat exchanger too dirty (heating) - indoor unit filter web blocked (heating) - indoor unit EXV not turn on properly (heating)

  • Page 76: Outdoor Error Code For Mds-M Pcb

    6.5 Outdoor Error Code for MDS-M PCB Error Description Possible Causes Page Code  Wrong combination of PCB hardware is designed for R22 but software for R410A unit is installed into it. PCB and software  R410 Wrong combination of PCB hardware is designed for R410A but software for R22 unit is installed into it.
  • Page 77  ER55 System error High pressure malfunction occur 3 times within 1 hour - outdoor unit motor broken (cooling) - outdoor circulating air short (cooling) - outdoor heat exchanger too dirty (cooling) - outdoor ball valve not open - indoor circulating air short (heating) - indoor heat exchanger too dirty (heating) - indoor unit filter web blocked (heating) - indoor unit EXV not turn on properly (heating)
  • Page 78  ER63 Slave outdoor unit Master and slave communication wire broken communication failure  Master and slave communication wire loose  Master and slave communication wire A B reversed  Slave unit power not on  Master and slave jump wire not correct, still on update status ...

  • Page 79: Troubleshooting Flow Chart

    6.6 Troubleshooting Flow Chart Indoor/outdoor sensor failure Error code: Decorative Error code #2 and #4, E1 to EC, F1 to F5, 11 to 1C (For MC301), E0 to E6 (For MDOM PCB), ER64 to ER75 (For MDS-M PCB) Turn off the unit Connect correctly and operate Is the sensor correctly again...
  • Page 80 Outdoor pressure sensor error Error Code: Decorative Error code #5, H5, L2, 35, 42 (For MC301), ER76 and ER77 (For MDS-M PCB) Turn off the unit Replace the wire and restart the Is the wire connection system to pressure sensor broken? Check the HS/LS port Fix the port/replace PCB and restart the system...
  • Page 81 Indoor pump error Error Code: Decorative Error code #3, FB (For MC301) Turn on the unit Replace the water level switch Check the water level switch. Is it functioning normally? Check the drain hose and pump Check the indoor pump. for blockage.
  • Page 82 Communication error Error Code: Decorative Error code #1, FC, L3 (For MC301), C- to CX (For MDOM PCB), EC00 to EC47, EC78 (For MDS-M PCB) Turn on the unit Is the PCB turned on? Check the power supply Turn off the unit. Check Tighten the wire and restart the is the connection of system...
  • Page 83 Compressor overload Error Code: Decorative Error code #7, H0 to H3, 30 to 33 (For MC301), H2 to H3 (For MDOM PCB), ER48 to ER51 (For MDS-M PCB) Turn off the unit Is the overload protector Reset and restart the system current setting correct? Refer wiring diagram.
  • Page 84 High/low pressure switch trip error Error Code: Decorative Error code #6, H4, H6, L1, 34, 41 (For MC301), E7, H1, L1 (For MDOM PCB), ER52 to ER53, ER56 (For MDS-M PCB) Turn on the unit Check on power supply and wiring connection.
  • Page 85 Master unit and slave unit communication error Error Code: FE (For MC301), ER63 (For MDS-M PCB) Turn off the unit Check the connection of Reconnect and restart the system the communication wire. Is it connected correctly? Replace the wire and restart the Is the communication system wire broken or loose?
  • Page 86 System malfunction error Error Code: Decorative Error code #8, E0, 10 (For MC301), E8 (For MDOM PCB), ER55 (For MDS-M PCB) Turn on the unit Replace outdoor fan motor Outdoor fan motor working? Ensure no obstacle around the unit Sufficient airflow? and conduct inspection on coil and filter Is the coil sensor and...
  • Page 87 Is the compressor overload protector protecting value Reset the overload protecting parameter correct? Change Measure compressor Measure compressor compressor running amp. winding resistance. Within spec ? Within spec ? Change Is compressor short compressor body? Measure suction Release or charge the unit with refrigerant pressure.
  • Page 88 Outdoor storage malfunction Error Code: F0, 20 (For MC301), ER54 (For MDS-M PCB) Turn on the unit Turn off the unit Restart the unit to confirm does the Press the reset button. error still persist Error still remains? Solder the loose component back Examine the PCB for and retest again loose components...
  • Page 89 Indoor and controller communication error Error Code: F6 (For MC301) Turn off the unit Is the wired controller Connect correctly and operate again connection loose? Is the wire exceed Connect correctly and operate again 10m length? Is the version of controller Change controller or upgrade the compatible with the indoor software for controller/indoor unit PCB.
  • Page 90 Ambient temperature beyond limit Error Code: F7, 27 (For MC301), ER59 (For MDS-M PCB) Turn off the unit Contact contractors for advice as Check the ambient condition is not suitable for the unit temperature, is it out to operate of specification? Check the surrounding of Ensure no obstacle around the unit units.
  • Page 91 Wired controller storage problem Error Code: FA (For MC301) Turn on the unit Press the reset button Restart the system and verify again on the wired controller. Is the error still exists? Replace wired controller Service Manual SM-MDS_(ii)
  • Page 92 Superheat protecting value too small Error Code: L0, 40 (For MC301), ER61 (For MDS-M PCB) Turn on the unit Indoor fan motor Replace indoor/outdoor fan motor (Cooling) / Outdoor fan motor (Heating) working? Is the sensor and pressure sensor correctly connected? Is the coil sensor (ID), Connect correctly and operate TH12 sensor (OD) and...
  • Page 93 Emergency Run Error Code: EF, 1F (For MC301), ER60 (For MDS-M PCB) Restart the unit Find the root cause for Is there any communication communication error and solve it. error captured by the system? Restart the unit Is the resistance for Replace sensor and restart the sensor TH12 normal? system...
  • Page 94 Wrong Hardware and Software combination Error Code: R22 (For MDS-M PCB) Turn off the unit Check the connector on outdoor PCB. Replace an outdoor PCB and Refer Appendix 7.6 re-program the PCB Is there any connection? Is the sensor and pressure sensor correctly connected? Remove the wire connection and restart the system...
  • Page 95 PCB Setting Error Error Code: ERSE (For MDS-M PCB) Turn off the unit Check the outdoor Correct the dipswitch and dipswitch setting, restart the unit is it correct? Is the sensor and pressure sensor correctly connected? Check whether the outdoor PCB is faulty.

  • Page 96: Appendix

    7.0 Appendix 7.1 Compatibility Chart for Indoor and Outdoor PCB MDOM PCB (Outdoor) with MC200-C / MC201-C PCB (Indoor) MDS-M PCB (Outdoor) with MC200-C / MC201-C PCB (Indoor) MDS-M PCB (R410A Outdoor) with MC200-C / MC201-C PCB (Indoor) Legend: Not compatible Compatible Service Manual SM-MDS_(ii)

  • Page 97: Compatibility Chart For Wired Handset Mc301

    Remark: 1. Only replace existing PCB with same or newer software version PCB. 2. When replacing outdoor PCB V2.5 and below with V2.6 and above (for R22 MDS-B model), replacing outdoor PCB V4.4 and below with V4.5 and above (for R22 MDS-A model) or replacing outdoor PCB V2.4A and below with V2.5A and above (for R410A model), please check the existing discharge temperature sensor TH1.

  • Page 98: Pressure Sensor Voltage And Resistance Value

    7.3 Pressure Sensor Voltage and Resistance Value High pressure sensor Service Manual SM-MDS_(ii)

  • Page 99: Character Reference For 7 Segment Led

    Low pressure sensor 7.4 Character Reference for 7 Segment LED Service Manual SM-MDS_(ii)

  • Page 100: Temperature Sensor Resistance Value

    7.5 Temperature Sensor Resistance Value Remark: Exclude discharge temperature sensor (TH1) and ambient temperature sensor (TH8) = 10KΩ ± 1% 25º C Service Manual SM-MDS_(ii)

  • Page 101: Hardware Configuration For 5Mds Outdoor

    7.6 Hardware Configuration for 5MDS Outdoor Remark: The marked wire should be connected only for R410A MDS model on outdoor MDS-M PCB. Service Manual SM-MDS_(ii)

  • Page 102: R22 Mds-A Series Cooling Cycle Reference

    7.7 R22 MDS-A Series Cooling Cycle Reference Service Manual SM-MDS_(ii)
  • Page 103 Service Manual SM-MDS_(ii)

  • Page 104: R22 Mds B Series Cooling Cycle Reference

    7.8 R22 MDS B Series Cooling Cycle Reference Service Manual SM-MDS_(ii)
  • Page 105 Service Manual SM-MDS_(ii)
  • Page 106 Service Manual SM-MDS_(ii)
  • Page 107 Service Manual SM-MDS_(ii)

  • Page 108: R22 Mds A Series Heating Cycle Reference

    7.9 R22 MDS A Series Heating Cycle Reference Service Manual SM-MDS_(ii)
  • Page 109 Service Manual SM-MDS_(ii)
  • Page 110 Service Manual SM-MDS_(ii)

  • Page 111: R22 Mds B Series Heating Cycle Reference

    7.10 R22 MDS B Series Heating Cycle Reference Service Manual SM-MDS_(ii)
  • Page 112 Service Manual SM-MDS_(ii)
  • Page 113 Service Manual SM-MDS_(ii)
  • Page 114 Service Manual SM-MDS_(ii)

  • Page 115: R410A Mds B Series Cooling Cycle Reference

    7.11 R410A MDS B Series Cooling Cycle Reference Service Manual SM-MDS_(ii)
  • Page 116 Service Manual SM-MDS_(ii)
  • Page 117 Service Manual SM-MDS_(ii)
  • Page 118 Service Manual SM-MDS_(ii)
  • Page 119 Service Manual SM-MDS_(ii)
  • Page 120 Service Manual SM-MDS_(ii)
  • Page 121 Service Manual SM-MDS_(ii)

  • Page 122: R410A Mds B Series Heating Cycle Reference

    7.12 R410A MDS B Series Heating Cycle Reference Service Manual SM-MDS_(ii)
  • Page 123 Service Manual SM-MDS_(ii)
  • Page 124 Service Manual SM-MDS_(ii)
  • Page 125 Service Manual SM-MDS_(ii)
  • Page 126 Service Manual SM-MDS_(ii)
  • Page 127 Service Manual SM-MDS_(ii)
  • Page 128 Service Manual SM-MDS_(ii)

  • Page 129: R22 Mds Bhc Series Cooling Cycle Reference

    7.13 R22 MDS BHC Series Cooling Cycle Reference Service Manual SM-MDS_(ii)
  • Page 130 Service Manual SM-MDS_(ii)
  • Page 131 Service Manual SM-MDS_(ii)
  • Page 132 For Master & Slave Combination (MDS220-280BHC), please refer to the base model for reference. Service Manual SM-MDS_(ii)

  • Page 133: Refrigerant Circuit Diagram

    7.14 Refrigerant Circuit Diagram MDS 30/40/50/60A MDS 70A Service Manual SM-MDS_(ii)
  • Page 134 MDS 30/40/50/60AR MDS 70AR Service Manual SM-MDS_(ii)
  • Page 135 MDS 80/100/120B MDS 80/100/120BR Service Manual SM-MDS_(ii)
  • Page 136 MDS 150B MDS 150BR Service Manual SM-MDS_(ii)
  • Page 137 MDS 180B MDS 180BR Service Manual SM-MDS_(ii)
  • Page 138 MDS 200/220/240B MDS 200/220/240BR Service Manual SM-MDS_(ii)
  • Page 139 MDS 260B Service Manual SM-MDS_(ii)
  • Page 140 MDS 260BR Service Manual SM-MDS_(ii)
  • Page 141 MDS 280/300/320B Service Manual SM-MDS_(ii)
  • Page 142 MDS 280/300/320BR Service Manual SM-MDS_(ii)
  • Page 143 5MDS 50/60/70B 5MDS 50/60/70BR Service Manual SM-MDS_(ii)
  • Page 144 5MDS 80/100/120B 5MDS 80/100/120BR Service Manual SM-MDS_(ii)
  • Page 145 5MDS 140/160/180B 5MDS 140/160/180BR Service Manual SM-MDS_(ii)
  • Page 146 5MDS 200/220/240B 5MDS 200/220/240BR Service Manual SM-MDS_(ii)
  • Page 147 5MDS 260/280/300B Service Manual SM-MDS_(ii)
  • Page 148 5MDS 260/280/300BR Service Manual SM-MDS_(ii)
  • Page 149 5MDS 320/340/360B Service Manual SM-MDS_(ii)
  • Page 150 5MDS 320/340/360BR Service Manual SM-MDS_(ii)
  • Page 151 5MDS 380/400/420B Service Manual SM-MDS_(ii)
  • Page 152 5MDS 380/400/420BR Service Manual SM-MDS_(ii)
  • Page 153 5MDS 440/460/480/500B Service Manual SM-MDS_(ii)
  • Page 154 5MDS 440/460/480/500BR Service Manual SM-MDS_(ii)
  • Page 155 MDS 080/100/120BHC MDS 140BHC Service Manual SM-MDS_(ii)
  • Page 156 MDS 160/180BHC MDS 200BHC Service Manual SM-MDS_(ii)
  • Page 157 MDS 220BHC Service Manual SM-MDS_(ii)
  • Page 158 MDS 240BHC Service Manual SM-MDS_(ii)
  • Page 159 MDS 260BHC Service Manual SM-MDS_(ii)
  • Page 160 MDS 280BHC Service Manual SM-MDS_(ii)

  • Page 161: Key Card Access Feature

    7.15 Key Card Access Feature For indoor PCB (MC200-C or MC201-C) with software version 2.7 and above, it is come equipped with an additional function called as “Key Card Access Feature”. This feature is particularly useful for application such as hotel room which requires the unit to be in standby and only allow user to operate the air conditioning unit when the hotel room card is inserted.
  • Page 162 The wiring diagram for this feature is as shown below: Indoor PCB T_OUTID2 Factory Installation On Site Installation Junction Box/Relay KEYCARD INTERCONNECTION WIRE Power Supply 240V/50Hz/1Ph 240V/50Hz/1Ph Contactor Remark: 1. When the T_IDOUT2 connector is OPEN, the indoor unit can be operated by handset. When the T_IDOUT2 connector is CLOSED, the indoor unit will stop operates and goes into standby mode.

  • Page 163: Error Code For Phase Protector

    7.16 Error Code for Phase Protector MDS unit is equipped with Scroll Compressor which can only rotate in one direction. For this reason, a protective device (phase protector) is fitted to prevent incorrect wiring of the electrical phases. When the three phases are not connected correctly, the phase protector operates, and the unit will not start.
  • Page 164 Service Manual SM-MDS_(ii)
  • Page 166 Products manufactured in an ISO certified facility. This document contains the most current product information as of this printing. For the most up-to-date product information, please go to www.mcquayup.com © 2012 McQuay International www.mcquayup.com...

This manual is also suitable for:

Mds 030aMds 040aMds 050aMds 060aMds 070aMds 080b ... Show all

Table of Contents

Save PDF