Service Manual SM-MDS_(i) Multi Digital Scroll System Engineered for flexibility and performance TM
The data and suggestions in this document are believed current and accurate at the time of publication, but they are not a substitute for trained, experienced and professional service. 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.
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 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.
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.
1.0 Introduction 1 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.
1 PWM 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 1. Digital Scroll Compressor is the leading compressor which will turn ON first. 2.
1 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.
1 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.
1 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_(i) 5
1 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.
2.0 System and Control 2.1 MDS Outdoor System and Control General Circuit Diagram 2 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.
2 Piping and Components Layout General layout of MDS system piping and components PWM Valve Control PWM (Pulse Width Modulation) valve is an ON/OFF valve. When signal is send from 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. EXV4 Control EXV4 governs the sub-cool circuit of MDS system.
Fan Speed Control 2 Outdoor fan speed control (cooling mode) Outdoor fan speed control (heating mode) Protection Devices MDS system has several sensor and pressure switch for protection purpose: • Discharge pressure protection (switch) • Suction pressure protection (sensor) • Discharge temperature protection for Digital Scroll Compressor • Compressor overload protection • Fan motor overload protection Others For Fix Scroll Compressor: • Minimum 3 minutes of start-up delay protection is available.
2.2 MDS Indoor System and Control 2 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. EXV Control The modulation of indoor EXV is controlled by the readings of Tin and Tout of the indoor unit.
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.
2.4 Heater Control 2 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). User can choose to install one or two heaters. The control algorithm of the heaters is shown below: 1 Heater -1 Ts Tr 0.5 When the set temperature (Ts) is higher than room temperature (Tr) by 0.
2.5 Outdoor Ball Valve Operation 2 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.
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.
16 MDS-M PCB 17 18 19 20 21 1 2 15 3 3 4 14 8 7 9 5 6 10 13 Remark: No 1 7 Segment LED Display 2 Reset Button 3 PCB Software Version 4 MDS-M PCB 5 Ain & Bin (To indoor) 6 Apc & Bpc (Centralize Control) 7 Dipswitch 1 (S1) 8 Dipswitch 2 (S2) 9 Dipswitch 3 (S3) 10 K1, K2, K3 & K4 Buttons 11 FIX - Fix compressor DIG - Digital compressor 12 LO FAN HI FAN 4WV - Four way valve 13 PWM - Pulse Width Modulation 12 11 No 14 15 16 17 18 19 20 21 FX1-OL - Fix compressor overload DIG-OL - Digital
3.2 MDS Indoor Unit PCB There are two types of PCB for MDS indoor unit, namely MC200-C and MC201-C.
10 MC201-C 17 18 19 20 11 1 21 2 12 3 13 15 3 14 4 16 5 6 7 8 Remark: No 1 Steping Motor 2 EXV2 3 EXV1 4 Apc & Bpc (Centralize Control) 5 Ain & Bin (Outdoor Communication) 6 T_Room - Room temperature 7 T_IN - Inlet coil temperature T_MID - Midlet coil temperature T_OUT - Outlet coil temperature 8 MC301 Wired Hanset Connector 9 Display Board & IR Receiver 10 Reset Button 9 No 11 12 13 14 15 16 17 18 19 20 21 Dipswitch 3 (SW3) Dipswitch 4 (SW4) Dipswitch 1 (SW1) Dipswitch 2 (SW2) MC201-C PC
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. The wire used for all will be the same.
MDOM PCB 3 For MDOM PCB, the communication terminals are already wired from the PCB to terminal block. Connect the wire accordingly (Ain outdoor to Ain indoor, Bin outdoor to Bin 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. Current models are having the label of Ain and Bin on the terminal block. However, older model has different terminal number (as shown below).
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. It may cause the outdoor model to trip after some time of operation. The communication jumper is labeled with the name JP1 and the location is shown below. 3 Location of jumper JP1 on indoor PCB MC200-C (left) and MC201-C (right) 3.3.
3.3.3 Wiring Connection Between MDS Master and Slave Unit Master Slave 3 For master & slave model, the communication connection is slightly different. From the master unit Ain & Bin, the communication wiring need to connect to the salve unit Apc & Bpc before connect to the indoors. Similarly, to ease installation, these communication terminals are already wired from the PCB to terminal block. Different model has different terminal number.
3.4.1 Wireless Handset G17 3 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. Personalize Setting • Press and hold for 3s, then will blink. Press again to cycle between and .. • Set the desire setting, then leave the handset for 4s without pressing any key and it will save the setting into the program.
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. 3 15. Clock Time Setting and hold to set the clock time.
3.4.2 Wired Controller MC301 3 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). • Press “FAN” for 5s to alter between °C and °F. 3. Fan Speed Setting • Press “FAN” key to adjust fan speed follows by: High→Auto→Low→Medium→High. • When the mode is “Fan”, there is no “Auto” speed.
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” again is the “CLOCK SET” icon will display and the current real time clock is twinkling. At this time, press “▲” to increase the hour, press “▼” to increase minutes，if there is not any press for 5s, it will exit without saving the changed real time.
3.4.3 Central Controller MC303 3 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 • Press “MODE” key for 5s then press “▲” or “▼” to view all the units. • Actual address has four figures; first two where show on minute previously are for outdoor unit, last two where show error previously at the right bottom corner are for indoor unit.
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 “_ _” for group setting and press “ENTER” to confirm.
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, Apc and Bpc) through daisy chain connection. One end of the screen layer should be earthed to protect the signal transmission.
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. 4 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. 4.
Step 2: Install USB Dongle Key Driver To set up the USB Dongle Key driver, the user is required to initiate the setup file in the SPI730 folder, which is located inside the Key_driver folder. 4 After initiated the setup file, just follow through the instruction on the prompt up screen to install the driver. Once the driver installation is completed, the following screen will appear. Click “finish” to complete the installation.
4.4 Wiring Connection MC501 gateway acts as a bridge in converting and transmitting signals and allows communication between computer and MDS system.
4 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. This converter cable can be obtained from any IT hardware outlet. When user purchased the RS232 to USB converter cable, it will come together with a CD which consist the driver.
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. The steps will be quite complicated.
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. If the COM port is less than 10, jump to step 6 and continue setting up the Smart Commander. If the COM port goes more than 10, kindly follow the next step to change the COM port number.
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. 4 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. Step 8 A new window will prompt up for parameter setting.
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.
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. 4.6.1 Circuit Monitor Circuit monitor interface is used to monitor all parameter of indoor and outdoor which connected to Smart Commander.
i) Outdoor Unit Monitoring Items that can be monitor on an outdoor unit are as follow: 4 Item Identity Mode Edition Cout Tsh_out Comp1/DIG Comp2/3/4/FIX FAN1/FAN2 HS / LS TH : : : : : EXV1/2/3 : EXV4 : SV1/2 : : : : : Display Type of model: Single / Master / Slave Operating Mode: Cooling / Heating / Defrost The program version of the outdoor Outdoor Capacity (Unit: HP) Outdoor unit superheat (Unit: °C) Digital compressor output percentage (Unit: %) Fixed compressor status.
ii) Outdoor Refrigerant Diagram Outdoor address Outdoor Model 4 Sensor location Red Line: Heating 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.
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. • Click on the Back Page or Next Page button, the whole set indoors will be change. • Enter the indoor address number. This will directly display the indoor the user selected to view.
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. 4 Service Monitor Window in Smart Commander There are 6 function buttons at the bottom of Service Monitor screen.
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.
• 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). • Defrost Interval Time: The interval time between defrost cycle. The smaller the value, the shorter time between the defrost cycle. The allowable range is from 25 minutes to 90 minutes. Default value is 45 minutes.
• Connection Param 1: Not applicable (for future provision). 4 • 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). For example, when it is set to 15, indoor capacity will be multiply by 1.5 times.
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.
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. Once all this is completed, user will be able to generate the report. The system layout and report is necessary in order to have a smooth running commissioning process. 5 5.
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. There are two ways to obtain the additional refrigerant required. It can be obtain from the report generated by selection software or through manual calculation.
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. These settings can be done during the installation process or before commissioning. It is advisable to check the settings before commissioning starts.
Dipswitch 2 (SW2) ON S2 (1) OFF (0) 1 2 3 4 5 6 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 S2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 S2.3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 S2.4 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 S2.5 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 S2.
Dipswitch 3 (SW3) ON S3 (1) 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. S3.1 0 1 0 0 0 1 1 0 1 1 0 0 0 5 S3.2 0 0 0 1 1 1 1 1 1 0 1 0 0 S3.3 0 1 1 0 0 0 1 1 1 0 0 0 0 S3.4 1 1 0 0 1 1 0 1 1 1 1 0 1 S3.5 0 0 0 0 0 0 0 0 0 0 1 1 1 Capacity (kW) 2.5 2.8 3.6 5.6 6.5 8.0 9.0 10.0 11.2 14.
Auto-Random Restart for Wired Controller (MC301) ON – °F OFF – °C ON OFF 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 5 OFF – Auto restart OFF For wired handset (MC301), there are 4 dipswitches on the back of the PCB. Once the auto-random restart is set, the LCD of the wired controller will have an indication.
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. As for the outdoor address, it is only required when there is a series of outdoors connected and control by the central control and monitoring software.
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. For dipswitches J2.6, model selection, it will determine whether the model is a cooling only model or a heatpump model. The reason of the needs of this selection is because the PCB is common for both cooling only model and heatpump model.
Set up Indoor Quantity To set up indoor quantity, you will need to utilize the K2 and K1 button (refer to page 14) and follow the procedure below: 1. Power up the outdoor. 2. Press K2 for 5 second to enter parameter setting mode. The 7 segments LED display will show [- - - -]. 3. You need to key in the password before you can make any changes. The password is 0755 4. Press K1 to select. Press K2 to confirm. 5. After it show [- - - -], press K1. It will show [- - - 0]. Press K2, it will show [- - 0-]. 6.
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 Dipswitch 1 (S1) ON (1) S1 OFF (0) 1 2 3 4 5 6 7 8 No. of indoor units MDS A/B Cooling only / Heatpump For dipswitch 1, there are 3 functions. S1.1 is to determine whether the PCB is use in the MDSA series or a MDS-B series. S1.
Set up Dipswitch 2 (S2) ON (1) S2 OFF (0) 1 2 3 4 5 6 7 8 Outdoor address Outdoor Capacity Reserved 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). Dipswitch S2.1 is to determine whether the outdoor is a single unit, master unit or salve unit. Dipswitch S2.3 is related to Dipswitch S3 which is used to determine the capacity of the outdoor. This will be cover in dipswitch S3. S2.
Set up Dipswitch 3 (S3) S3 ON (1) OFF (0) 1 2 3 4 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 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.
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).
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. Set the indoor temperature according to the design requirement.
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. For units that are connected to the wired controller MC301 (such as ceiling concealed), the error code will display on controller screen. For outdoor unit, the error code generated will display on the 7 segments display on outdoor PCB.
6.
Error Code #6 Description Possible causes Cool/Heat BLINKING • High pressure trip - 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) - indoor unit EXV not turn on properly (heating) - too much refrigerant - outdoor unit PCB high pressure output port malfunction - pressure sensor broke
6.
6 EC TH12 open/short circuit (suction) • Outdoor suction temperature sensor TH12 broken or loose 73 EF 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): 1. System sub heat <1ºC for 15 minutes 2.
FE Master unit and slave unit communication malfunction • • • • Master unit and slave unit communication wire reversed Master unit and slave unit communication wire broken or loose Slave unit toggle switch set wrongly Master and slave unit PCB version conflict / different 79 H0 Digital compressor overloaded • Digital compressor operating current too high, overload protector OL4 on 77 H1 Fixed compressor 1 overloaded • Fixed compressor 1 operating current too high, overload protector OL1 on H2
L2 Low pressure sensor broken • • Low pressure sensor connecting wire broken Outdoor PCB LS port broken 74 L3 Indoor and outdoor communication • Outdoor work normal, but all indoor communication abnormal 76 10 System malfunction (slave unit) • • • • Slave unit high pressure malfunction occurred 3 times Low pressure malfunction occurred 3 times Discharge temperature too high 1 times Compressor overload protector jumped for 3 times 80 11 TH1 open/short-circuit (slave unit discharge) • Slave
27 Ambient temperature is out of operation limit range (slave unit) • 84 • Ambient temperature is out of operation limit range 1. Cooling ambient temperature range: 0ºC – 43ºC 2. Heating ambient temperature range: -15ºC – 16ºC Outdoor slave unit circulating air short-circuit 1. Result in ambient temperature raising to exceed operation limit range when cooling 2.
6.
E8 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) - too much refrigerant - outdoor unit PCB high pressure output port malfunction - pressure sens
6.5 Outdoor Error Code for MDS-M PCB Error Code 6 Description Possible Causes Page R22 Wrong combination of PCB and software • PCB hardware is designed for R22 but software for R410A unit is installed into it. 88 R410 Wrong combination of PCB and software • PCB hardware is designed for R410A but software for R22 unit is installed into it.
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) - too much refrigerant - outdoor unit PCB high pressure output port malfunction - pressure sensor broke
ER63 Slave outdoor unit communication failure • • • • • • • • Master and slave communication wire broken 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 Last outdoor unit terminal resistance of communication wire not short-circuit Master and slave PCB program not compatible.
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 NO Is the sensor correctly connected? Connect correctly and operate again YES Is the sensor resistance characteristics normal? Refer Appendix 7.
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 Is the wire connection to pressure sensor broken? YES Replace the wire and restart the system NO Fix the port/replace PCB and restart the system NO Replace the sensor and restart the system NO Check the HS/LS port on outdoor PCB. Normal? YES 6 Is the resistance of the pressure sensor normal? Refer Appendix 7.
Indoor pump error Error Code: Decorative Error code #3, FB (For MC301) Turn on the unit Check the water level switch. Is it functioning normally? NO Replace the water level switch YES Check the indoor pump. Is it functioning normally? YES Check the drain hose and pump for blockage.
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? NO Check the power supply YES Turn off the unit. Check is the connection of communication wire loose. YES Tighten the wire and restart the system NO 6 Check is the communication wire broken / shorted.
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 current setting correct? Refer wiring diagram.
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 Outdoor fan motor working? NO Check on power supply and wiring connection.
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 the communication wire.
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 Outdoor fan motor working? NO Replace outdoor fan motor YES Sufficient airflow? NO Ensure no obstacle around the unit and conduct inspection on coil and filter NO Connect correctly and operate again YES Is the coil sensor and pressure sensor correctly connected? 6 YES Is the coil sensor and pressure sensor resistance characteristics normal? Refer Appendix 7
Is the compressor overload protector protecting value correct? NO Reset the overload protecting parameter YES Measure compressor running amp. Within spec ? NO Measure compressor winding resistance. Within spec ? NO Change compressor YES Change compressor YES YES Is compressor short body? NO 6 Measure suction pressure. Within spec? NO Release or charge the unit with refrigerant according to specification.
Outdoor storage malfunction Error Code: F0, 20 (For MC301), ER54 (For MDS-M PCB) on the TurnTurn off the unitunit Press the reset button.
Indoor and controller communication error Error Code: F6 (For MC301) Turn off the unit Is the wired controller connection loose? YES Connect correctly and operate again NO Is the wire exceed 10m length? YES Connect correctly and operate again NO 6 Is the version of controller compatible with the indoor PCB? Refer Appendix 7.2 NO Change controller or upgrade the software for controller/indoor unit PCB. Restart the system to verify YES Replace the wired controller. Turn on the unit.
Ambient temperature beyond limit Error Code: F7, 27 (For MC301), ER59 (For MDS-M PCB) Turn off the unit Check the ambient temperature, is it out of specification? YES Contact contractors for advice as condition is not suitable for the unit to operate YES Ensure no obstacle around the unit and conduct inspection on coil and filter NO Replace sensor and restart the system NO Check the surrounding of units.
Wired controller storage problem Error Code: FA (For MC301) Turn on the unit Press the reset button on the wired controller.
Superheat protecting value too small Error Code: L0, 40 (For MC301), ER61 (For MDS-M PCB) Turn on the unit Indoor fan motor (Cooling) / Outdoor fan motor (Heating) working? NO Replace indoor/outdoor fan motor YES Is the coil sensor (ID), TH12 sensor (OD) and low pressure sensor correctly connected? NO Connect correctly and operate again YES 6 Is the sensors resistance characteristics normal? Refer Appendix 7.3 & 7.
Emergency Run Error Code: EF, 1F (For MC301), ER60 (For MDS-M PCB) Restart the unit Is there any communication error captured by the system? YES Find the root cause for communication error and solve it. Restart the unit NO Is the resistance for sensor TH12 normal? Refer Appendix 7.5 NO Replace sensor and restart the system YES 6 Check the refrigerant charge.
Wrong Hardware and Software combination Error Code: R22 (For MDS-M PCB) Turn off the unit Check the connector on outdoor PCB. Refer Appendix 7.6 Is there any connection? NO Replace an outdoor PCB and re-program the PCB YES Remove the wire connection and restart the system 6 Error Code: R410 (For MDS-M PCB) Turn off the unit Check the connector on outdoor PCB. Refer Appendix 7.
PCB Setting Error Error Code: ERSE (For MDS-M PCB) Turn off the unit Check the outdoor dipswitch setting, is it correct? NO Correct the dipswitch and restart the unit YES Check whether the outdoor PCB is faulty.
7.0 Appendix 7.
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. If the discharge temperature sensor is not from Minjie brand, it should be change to this brand.
7.
Low pressure sensor 7 7.
7.
7.6 Hardware Configuration for 5MDS Outdoor 7 Remark: The marked wire should be connected only for R410A MDS model on outdoor MDS-M PCB.
7.
7 Service Manual SM-MDS_(i) 97
7 7.
7 Service Manual SM-MDS_(i) 99
7 100 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 101
7 7.
7 Service Manual SM-MDS_(i) 103
7 104 Service Manual SM-MDS_(i)
7.
7 106 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 107
7 108 Service Manual SM-MDS_(i)
7.
7 110 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 111
7 112 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 113
7 114 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 115
7.
7 Service Manual SM-MDS_(i) 117
7 118 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 119
7 120 Service Manual SM-MDS_(i)
7 Service Manual SM-MDS_(i) 121
7 122 Service Manual SM-MDS_(i)
7.
MDS 30/40/50/60AR 7 MDS 70AR 124 Service Manual SM-MDS_(i)
MDS 80/100/120B 7 MDS 80/100/120BR Service Manual SM-MDS_(i) 125
MDS 150B 7 MDS 150BR 126 Service Manual SM-MDS_(i)
MDS 180B 7 MDS 180BR Service Manual SM-MDS_(i) 127
MDS 200/220/240B 7 MDS 200/220/240BR 128 Service Manual SM-MDS_(i)
MDS 260B 7 Service Manual SM-MDS_(i) 129
MDS 260BR 7 130 Service Manual SM-MDS_(i)
MDS 280/300/320B 7 Service Manual SM-MDS_(i) 131
MDS 280/300/320BR 7 132 Service Manual SM-MDS_(i)
5MDS 50/60/70B 7 5MDS 50/60/70BR Service Manual SM-MDS_(i) 133
5MDS 80/100/120B 7 5MDS 80/100/120BR 134 Service Manual SM-MDS_(i)
5MDS 140/160/180B 7 5MDS 140/160/180BR Service Manual SM-MDS_(i) 135
5MDS 200/220/240B 7 5MDS 200/220/240BR 136 Service Manual SM-MDS_(i)
5MDS 260/280/300B 7 Service Manual SM-MDS_(i) 137
5MDS 260/280/300BR 7 138 Service Manual SM-MDS_(i)
5MDS 320/340/360B 7 Service Manual SM-MDS_(i) 139
5MDS 320/340/360BR 7 140 Service Manual SM-MDS_(i)
5MDS 380/400/420B 7 Service Manual SM-MDS_(i) 141
5MDS 380/400/420BR 7 142 Service Manual SM-MDS_(i)
5MDS 440/460/480/500B 7 Service Manual SM-MDS_(i) 143
5MDS 440/460/480/500BR 7 144 Service Manual SM-MDS_(i)
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