Midea C Series Technical & Service Manual
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Midea C Series Technical & Service Manual

Fan coil unit 220-240v, 50hz
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Technical Service Manual
Fan Coil Unit
220-240V, 50Hz

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Summary of Contents for Midea C Series

  • Page 1 Technical Service Manual Fan Coil Unit 220-240V, 50Hz...
  • Page 2 Midea 50Hz AC Fan Coil Unit 2-Pipe Wall-mounted Series Technical Service Manual Midea reserves the right to discontinue, or change specification or designs at any time without notices and without incurring obligations...

  • Page 3: Table Of Contents

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Content 1.INTRODUCTION ................2 2.NOMENCLATURE ................. 2 3.PRODUCT SCHEDULE ..............2 4.EXTERNAL APPEARANCE ............3 5.FEATURE ..................3 6.SPECIFICATIONS ................. 5 7.DIMENSIONS ................9 8.SERVICE SPACES ..............10 9.WIRING DIAGRAMS ..............11 10.CAPACITY TABLES ..............

  • Page 4: Introduction

    Midea MKG series fan coil unit has been tested by national AC quality supervise testing center, as low noise level, high efficiency, stable operation and low power consumption make it as the advanced production in the world,. Due to their reduced dimensions and pleasing design, these units are ideally suited for Commercial and Residential environments.

  • Page 5: External Appearance

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 4. External Appearance C panel S panel 5. Feature Multi-connection outlet pipe method: left/right/rear, more flexible for installation.  Left piping Left back piping Right piping Right back piping Wind direction adjustment can be in horizontal and vertical way for auto swing louver ...
  • Page 6 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Built-in 3-way electromagnetic valve.  Cross flow fan creates quiet and comfortable environment.  Easy maintenance has been realized as the front panel can be removed for easy access. ...

  • Page 7: Specifications

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 6. Specifications Model MKG- H/M/L 425/360/320 510/430/380 680/580/510 Air flow H/M/L 250/210/190 300/250/220 400/340/300 Capacity H/M/L 2.2/1.84/1.65 2.64/2.24/2.05 3.08/2.62/2.27 Cooling Water flow rate Water pressure drop Capacity H/M/L 3.02/2.6/2.23 3.69/3.25/2.77 4.34/3.86/3.25...
  • Page 8 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Specifications Model MKG- H/M/L 850/720/640 1020/870/770 Air flow H/M/L 500/420/380 600/510/450 Capacity H/M/L 4.07/3.73/3.24 4.45/4.18/3.74 Cooling Water flow rate Water pressure drop Capacity H/M/L 5.69/5.12/4.32 6.3/5.67/4.73 Heating Water pressure drop 25.1...
  • Page 9 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Specifications Model MKG-250-B MKG-300-B MKG-400-B Power supply V/Ph/Hz 220-240/1/50 425/390/350 510/470/390 680/550/460 Air flow (H/M/L) 250/230/205 300/275/230 400/325/270 Capacity (H/M/L) 2.63/2.41/2.16 2.97/2.47/2.12 3.28/2.83/2.41 Cooling Water flow rate Water pressure drop 29.4...
  • Page 10 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Specifications Model MKG-500-B MKG-600-B Power supply V/Ph/Hz 220-240/1/50 850/745/620 1020/915/780 Air flow (H/M/L) 500/440/365 600/540/460 Capacity (H/M/L) 4.25/3.85/3.32 5/4.47/3.97 Cooling Water flow rate Water pressure drop 31.8 42.5 Capacity (H/M/L) 5.81/5.17/4.43...

  • Page 11: Dimensions

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 7. Dimensions C-panel Model MKG-250 MKG-300 MKG-400 MKG-500 MKG-600 1070 1070 S-panel MKG-250-B, MKG-300-G, MKG-400-B - 9 -...

  • Page 12: Service Spaces

    MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MKG-500-B, MKG-600-B 8. Service Spaces - 10 -...

  • Page 13: Midea 50Hz Ac Fan Coil Unit Two-Pipe Wall-Mounted Series Mcac-Utsm

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 9. Wiring Diagrams - 11 -...

  • Page 14: Capacity Tables

    MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 10. Capacity Tables C panel Cooling capacity EWT: Enter Water Temp. (°C) Δt: Temperature Difference (°C) DB: Dry Bulb Temp. (°C) WB: Wet Bulb Temp. (°C) TC: Total Cooling Capacity (kW)
  • Page 15 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Cooling Capacity MKG-300 Air inlet condition Δt DB:26.7 WB:19.4 DB:27 WB:18 DB:27 WB:19 DB:27 WB:20 DB:29 WB:21 WF WPD TC WF WPD TC WF WPD TC WF WPD TC WF WPD 3.36 2.03 0.96 81.2 3.09 2.23 0.88 68.3...
  • Page 16 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Cooling Capacity MKG-400 Air inlet condition Δt DB:26.7 WB:19.4 DB:27 WB:18 DB:27 WB:19 DB:27 WB:20 DB:29 WB:21 WF WPD TC WF WPD TC WF WPD TC WF WPD TC WF WPD 3.92 2.36 1.13 99.2...
  • Page 17 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Cooling Capacity MKG-500 Air inlet condition Δt DB:26.7 WB:19.4 DB:27 WB:18 DB:27 WB:19 DB:27 WB:20 DB:29 WB:21 WF WPD TC WF WPD TC WF WPD TC WF WPD TC WF WPD 5.19 3.12 1.49 117.3 4.76 3.44 1.36 98.7 5.08 3.26 1.46 112.5 5.37 3.12 1.54 125.9 5.67 2.98 1.63 140.3...
  • Page 18 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Cooling Capacity MKG-600 Air inlet condition Δt DB:26.7 WB:19.4 DB:27 WB:18 DB:27 WB:19 DB:27 WB:20 DB:29 WB:21 WF WPD TC WF WPD TC WF WPD TC WF WPD TC WF WPD 5.67 3.42 1.63 130.8 5.2...
  • Page 19 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 C panel Heating Capacity Δt: Temperature Difference (℃) TH: Total Heating Capacity (kW) WF: Water Flow (m WPD: Water Pressure Drop (kPa) MKG-250 Air inlet temp. (20℃ DB) Water inlet temp. (℃) Δt...
  • Page 20 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Heating capacity modification coefficient table: Speed High 0.86 0.88 0.89 0.90 0.90 0.74 0.75 0.75 0.76 0.75 Altitude modification coefficient table: Altitude 0.98 0.95 0.95 1000 0.97 0.91 0.91 1500 0.95...
  • Page 21 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 S panel Cooling Capacity EWT: Enter Water Temp. (°C) Δt: Temperature Difference (°C) DB: Dry Bulb Temp. (°C) WB: Wet Bulb Temp. (°C) TC: Total Cooling Capacity (kW) SC: Sensible Cooling Capacity (kW)
  • Page 22 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Cooling Capacity MKG-300-B Air inlet condition Δt DB:21 WB:15 DB:26.7 WB:19.4 DB:27 WB:19 DB:29 WB:21 DB:33 WB:25 WF WPD WF WPD WF WPD WF WPD WF WPD 2.46 1.78 0.70 67.6 3.78 2.28 1.08 160.5 3.71 2.38 1.06 154.1 4.14 2.17 1.19 192.1 5.57 2.70 1.60 348.0 2.31 1.68 0.50 33.6 3.64 2.21 0.78 83.5 3.58 2.31 0.77 80.8 3.98 2.10 0.86 99.7 5.40 2.61 1.16 183.9...
  • Page 23 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Cooling Capacity MKG-400-B Air inlet condition Δt DB:21 WB:15 DB:26.7 WB:19.4 DB:27 WB:19 DB:29 WB:21 DB:33 WB:25 WF WPD WF WPD WF WPD WF WPD WF WPD 2.71 1.97 0.78 82.6 4.18 2.52 1.20 196.2 4.09 2.63 1.17 188.3 4.57 2.40 1.31 234.8 6.15 2.98 1.76 425.2 2.55 1.86 0.55 41.1 4.02 2.44 0.86 102.0 3.95 2.55 0.85 98.7 4.39 2.32 0.94 121.9 5.96 2.89 1.28 224.7...
  • Page 24 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Cooling Capacity MKG-500-B Air inlet condition Δt DB:21 WB:15 DB:26.7 WB:19.4 DB:27 WB:19 DB:29 WB:21 DB:33 WB:25 WF WPD WF WPD WF WPD WF WPD WF WPD 3.51 2.55 1.01 60.4 5.42 3.26 1.55 143.4 5.30 3.40 1.52 137.6 5.92 3.11 1.70 171.6 7.97 3.86 2.29 310.8 3.31 2.41 0.71 30.1 5.21 3.16 1.12 74.6 5.12 3.31 1.10 72.1 5.69 3.01 1.22 89.1 7.73 3.74 1.66 164.3...
  • Page 25 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Cooling Capacity MKG-600-B Air inlet condition Δt DB:26.7 WB:19.4 DB:27 WB:18 DB:27 WB:19 DB:27 WB:20 DB:29 WB:21 WF WPD WF WPD WF WPD WF WPD WF WPD 4.13 3.00 1.19 80.7 6.37 3.84 1.83 191.7 6.24 4.00 1.79 183.9 6.97 3.66 2.00 229.4 9.38 4.55 2.69 415.4 3.89 2.84 0.84 40.2 6.13 3.72 1.32 99.7 6.02 3.89 1.30 96.4 6.70 3.54 1.44 119.1 9.09 4.40 1.95 219.5...
  • Page 26 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series S panel Heating Capacity Δt: Temperature Difference (℃) TH: Total Heating Capacity (kW) WF: Water Flow (m WPD: Water Pressure Drop (kPa) MKG-250-B Air inlet temp. (20℃ DB) Water inlet temp. (℃) Δt...
  • Page 27 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Heating capacity modification coefficient table: Speed High 0.86 0.88 0.89 0.90 0.90 0.74 0.75 0.75 0.76 0.75 Altitude modification coefficient table: Altitude 0.98 0.95 0.95 1000 0.97 0.91 0.91 1500 0.95...

  • Page 28: Sound Levels

    MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 11. Sound Levels Noise level under three speeds of fan [dB(A)] Series Model MKG-250 MKG-300 C panel MKG-400 MKG-500 MKG-600 MKG-250-B MKG-300-B MKG-400-B S panel MKG-500-B MKG-600-B - 26 -...

  • Page 29: Exploded View

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 12. Exploded View C panel Part Name Quantity Part Name Quantity Filter Louver Evaporator I Panel dalle Evaporator II Panel Evaporator Panel frame ass'y Ⅲ Coil temp sensor Stepper motor...
  • Page 30 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series S panel Part Name Quantity Part Name Quantity Panel ass'y Pipe clamp Panel decorative plates Chassis ass'y Electrical cover Drainage pan ass'y Panel frame ass'y Cross fan Screw cover Bearing block...

  • Page 31: Installation

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 13. Installation 13.1 Installation Attention ※ Warning: • Be sure only trained and qualified service personnel to install, repair or service the equipment. Improper installation, repair, and maintenance may result in electric shocks, short-circuit, leaks, fire or other damage to the equipment.
  • Page 32 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series • Connect the outdoor unit wires, then connect the indoor unit wires. You are not allowed to connect the air conditioner with the power source until wiring and piping the air conditioner is done.

  • Page 33: Inspecting And Handling The Unit

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 13.2 Accessory Name Shape Quantity Function Installation board Screw ST3.9x25 for installation board Secure the installation board Plastic expanded tube Wrapping tape Drain pipe Sealing clay Wall conduit cover Remote controller (including operation manual)
  • Page 34 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series  A place which provides the space around the indoor unit as required right in the diagram.  There is strong electromagnetic wave existing.  A place which is far from heat, steam and inflammable gas.
  • Page 35 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 When connection extension drain hose, insulate the connecting part of extension drain hose with a shield pipe.  Connection pipe 1. When install the water pipe of G unit, please following it a) Put down two screws between the pipe holder and unit, and then get down pipe holder.
  • Page 36 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 2. For the left-hand and rear-left-hand piping, install the piping as shown. Bend the connective pipe to be laid at 43mm height or less from the wall. 3. Fix the end of the connective pipe.

  • Page 37: Water Pipe Installation

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 side to see that it is securely hooked. • Piping can easily be made by lifting the indoor unit with a cushioning material between the indoor unit and the wall. Get it out after finish piping.
  • Page 38 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 13.6 Wiring Cautions: • The reserved function is indicated in broken line table, users can select it when necessary. • An all-pole disconnection device which has at least 3mm separation distance in all pole and a residual current device (RCD) with the rating of above 10mA shall be incorporated in the fixed wiring according to the national rule.
  • Page 39 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Please adopt the shielded twisted-pair wire, and connect the shielded layer to E Insert 2 & 3 together is OK The reserved wire control function is indicated in broken line table, users can purchase the wire controller when necessary.
  • Page 40 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 13.7 Trouble-shooting Malfunction code Malfunction DC motor malfunction T2 evaporator sensor malfunction T1 evaporator sensor malfunction Water-level alarm malfunction EEPROM communication error EE: Water-level alarm malfunction Exist Water-level switch connecting wire Reconnect and ensure that the between switch and main board gets loose.
  • Page 41 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 E3: T1 evaporator sensor malfunction Exist T1 connecting wire between sensor and Reconnect and ensure that the mainboard gets loose. connection is reliable. Exist Temperature sensor is short-circuited or Replace sensor.

  • Page 42: Controller

    MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series Before asking for serving or repairing, check the following points. Symptoms Causes Solution When the automatic mode is • Check whether the MODE indicated selected, the air conditioner will on the display is “AUTO”.

  • Page 43: Mcac-Utsm

    Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606  Introduction of Function Buttons on the Remote Controller 1. TEMP DOWN Button: Push the TEMP DOWN button to decrease the indoor temperature setting or to adjust the timer in a counter-clockwise direction.
  • Page 44 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series  Introduction of Indicators Display Panel AUTO COOL HIGH HEAT 1. TRANSMISSION Indicator: This indicator lights when remote controller transmits signals to indoor unit. 2. MODE Display: Shows the current operation mode - AUTO, COOL, DRY or HEAT. HEAT only available for heat pump model.
  • Page 45 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 indoor unit lights. The operating mode of AUTO FAN SPEED is automatically set and there are no indicators shown on the display panel of the remote controller. 4. Push the ON/OFF button again to stop the unit.
  • Page 46 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series to the Air Conditioner. Then after approximately another 2 seconds, the set temperature will re-appear on the digital display. 3. Set the STARTING & STOPPING time 1) Please press the CANCEL button to cancel any former settings.
  • Page 47 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Mode select button (MODE) Press MODE button to select “COOL”, “DRY” , "HEAT", or "FAN ONLY" mode.(HEAT is invalid for COOL ONLY wire controller.) 2. Fan speed button (FAN SPEED) Press FAN SPEED to select fan speed from "AUTO", "LOW","...
  • Page 48 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 3. Timer off button Push the button to set TIMER OFF, each time you push the button the time moves forward by 0.5 hours. When the set time is over 10 hours, each time you push the button the time moves forward by 1 hour. If want to cancel the TIMER OFF, then adjust the time of TIMER OFF as 0.0.
  • Page 49 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Infraed Pipe Wire Joint, 5p 5-Core Shield Cable, the length is decided by installation Indoor Unit Switch Board Indoor Unit Installation description: When the air conditioner needs the constant frequency wire Controller, be sure adding a Wire Joint with 5 terminal...
  • Page 50 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 14.2.2 Wired Controller: KJR-12B Name and Function of LCD display on the controller  Operation mode indication Follow me function ON/OFF indication Fan speed indication Lock Timer ON/OFF Temperature display zone 1.
  • Page 51 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 display in fan mode.  Name and functions of buttons on the controller ON / OFF BUTTON ⑦ MODE BUTTON ① ② ⑧ ADJUST BUTTON ▲ TIMER ON BUTTON TIMER...
  • Page 52 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series First press “start swing”; second press “stop swing”. (Match to some model with swing function). 11. Economy operation button Press this button, the indoor unit operates in economy mode, press again, exit this mode (it may be ineffective for some models) 12.
  • Page 53 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 Caution: The connecting wire should be a little longer as to take away the switch board easily for maintenance The connecting wire should be a little longer as to take away the controller easily for maintenance.
  • Page 54 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series  Liquid crystal matrix display description - 52 -...
  • Page 55 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series MCAC-UTSM-201606 1. The liquid crystal matrix is composed of 4×64 grids, and each grid is composed of two blocks of different sizes (as shown in the above figure). 2. The matrix includes horizontal coordinates 00-15 on the upper side and vertical coordinates 00+, 16+, 32+ and 48+ on the left side, which indicate the address of the indoor unit.
  • Page 56 MCAC-UTSM-201606 Midea 50Hz AC Fan Coil Unit Two-pipe Wall-mounted Series 2. Description of the query page 1) The LCD displays the query page, and the air conditioner with the address of 08 is being queried. Mode of the air conditioner with the address 01 is: Cooling, strong air, swing on, indoor temperature 22°C, set temperature 20°C, cooling mode “lock”.
  • Page 57 Commercial Air Conditioner Division Midea Group Address: Midea Headquarters Building, 6 Midea Avenue, Beijiao, Shunde, Foshan, Guangdong, China Midea CAC After-service Application Midea CAC News Application Postal code: 528311 Tel: +86-757-26338346 Fax: +86-757-22390205 cac.midea.com global.midea.com Note: The data in this book may be changed without notice for further improvement on...

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