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www.mideaaircon.com 31 

 

10.2.3  Drive-by-wire controller failure (LE). 

 

Error Code: 

LE 

 
 

Malfunctioning conditions: 

1. 

Electric heating signal or compressor signal is on, but fan 
signal is off. 

2. 

Electric heating and compressor signals are on, but 4-way 
valve signal is off. 

3. 

Cooling only models have heating signal, or the 4-way 
valve and compressor signals are on at the same time. 

 

Possible causes: 

●

 

Wiring error 

●

 

Faulty wire controller 

●

 

Wire controller doesn’t match 

 

Troubleshooting: 

 

 

DIP Switch Terminal 

Designation 

24V Controller 

FC(L) 

Front desk control terminal L 

 

FC(N) 

Front desk control terminal N 

 

LOW-FAN 

Low fan speed 

GL 

HI-FAN 

High fan speed 

GH 

4-WAY 

4-way valve(for heat pump model) 

B 

HEAT2 

Electrical heater 2 

W 

HEAT1 

Electrical heater 1 

(W) 

COMP 

Compressor 

Y 

24V(N) 

24VAC terminal N  COM 

C 

24V(L) 

24VAC terminal L 

R 

Содержание MP12HMB63

Страница 1: ...SERVICE MANUAL PTACSERIES 7 000 15 000 BTU H ...

Страница 2: ... Function 7 1 Terms and Definitions 7 2 Electric Control WorkingEnvironment 7 3 Protection Function 7 4 Operation of Fan Motor 7 5 Operation ofCompressor 7 6 DIP Switches and Jumper Selection 8 Operations Characteristics 8 1 Cooling Operation 8 2 Heating Operation 9 Power Connection Options 10 Troubleshooting 10 1Error Display 10 2Troubleshooting 1 3 1 1 3 3 4 5 15 5 7 7 8 9 15 16 20 21 21 25 21 2...

Страница 3: ...d exposed sharp edges especially the casing edges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install the product on a defective installation stand Be sure the installation area does not deteriorate with age to avoid the base collapsing Do not let the air conditioner run for a long period of time when there is high ...

Страница 4: ...l product where noise or hot air from the outdoor unit can bother others or damage property In order to avoid personal injury use two or more people to lift and transport product Do not install the product where it will be directly exposed to ocean breeze salt spray It may cause corrosion which particularly on the condenser and evaporator fins could cause product malfunction or inefficient operati...

Страница 5: ...r dispose of them in a fire If the liquid from the batteries touches exposed skin and or gets on clothing wash with clean water Do not use the remote if the batteries have leaked 2 Dimensions Dimensions W x H x D inches Dimension 1 No sleeve rear grille or rear net 42 x 15 9 x 20 9 Dimension 2 Includes sleeve with no rear grille and rear net 42 x 16 x 22 8 Dimension 3 Includes sleeve and rear net ...

Страница 6: ...www mideaaircon com 4 3 Unit Components Decomposition Figure ...

Страница 7: ...www mideaaircon com 5 4 Installation Details 4 1 How to Install Unit ...

Страница 8: ... To avoid vibration and noise make sure the unit is installed securely and firmly When installing the sleeve make certain there is nothing within 20 inches of the back that would interfere with heat radiation and exhaust airflow See Fig 2 Fig 2 Refer to the installation instruction of sleeve assembly for more details UNIT INSTALLATION Carefully remove shipping tapes from the front panel See Fig 3 ...

Страница 9: ...n an undesirable location an accessory drain kitshould be installed and connected to drain system 4 2 Care and Cleaning FRONT PANEL AND CASE Turn unit off and disconnect from power supply To clean use water and a mild detergent Do not use bleach or abrasive materials Some commercial cleaners may damage the plastic parts OUTDOOR COIL Coil on outdoor side of unit should be checked regularly Unit wil...

Страница 10: ...ll out the vent door steel wire from the hole of the vent door then take off the vent door and filter See Fig 12 Clean the filter Dry thoroughly before replacing Replace the vent door reinstall the four screws Reinsert the vent door steel wire To clean air filters o Vacuum off heavy soil o Run water through filter and o Dry thoroughly before replacing CAUTION UNIT DAMAGE HAZARD Failureto followthi...

Страница 11: ...www mideaaircon com 9 4 3 Other Installations Optional Wired Wireless Digital Wall Stat and EMS systems DIP SWITCH 24V WIRED CONTROL Digital Wired Wireless Wall Stat Terminal ...

Страница 12: ...llation To install wired thermostat plug it in directly to the unit as shown below Controller for Wired Stat Hook up wall stat connector with the digital stat controller circled in red 24V Controller for PRO1 wireless or other wired modules ...

Страница 13: ...www mideaaircon com 11 Hook up wall stat connector to the unit as shown in the image It is advisable to affix wall stat wire with tape to avoid any damage while installing the unit ...

Страница 14: ...tal Wall Stat Configuration Follow the steps below 1 Power OFF the unit 2 Turn OFF all the DIP switches by pushing themdown 3 Turn ON S3 the second switch on the second block from right by pushing it up Circled in red below 4 Detach the controller cover ...

Страница 15: ...www mideaaircon com 13 5 Connect the wireless or wired module with controller Use the table below as guidance ...

Страница 16: ...www mideaaircon com 14 6 Jump the connection between Heat 1 and Heat 2 as shownbelow 7 After connecting the stat with unit apply double sided tape on the back of wireless module ...

Страница 17: ...dure below Press and hold and on thermostat until it displays CA 1 Then press them again to get either CO b or CO 0 If CO 0 is displayed then press to change it to CO If CO b is displayed then wait for the thermostat to return to temperature screen 11 Replace the cover and assemble the unit 12 Turn ON the unit and allow 3 minutes for responsetime ...

Страница 18: ...according to the difference between the set temperature and the ambient temperature The fan motor cycles on and off with the compressor and electric heater FAN Fan operation only without heating and cooling NOTE The reverse cycle and electric heater cannot run at the same time It is normal for the reverse cycle heat mode not to operate in the following cases 1 When the outdoor temperature is lower...

Страница 19: ... When receiving the wired remote control signal display LC Or when wired remote control signal is not received within the panel key operation for 5 seconds to display LC FC Front deskcontrol Error codes AS Open or short circuit of ambient temperature sensor T1 ES Open or short circuit of evaporator temperature sensor T2 CS Open or short circuit of condenser temperature sensor T3 OS Open or short c...

Страница 20: ...re is lower than 32 F HI Room temperature is higher than 99 F E4 Communication failure between main control board and display board LE Wire Controller mode failure DIP Switches Configurations and functions of each DIP switch position are explained below ...

Страница 21: ...e unit this DIP switch must be moved to the Wall Thermostat Enable position in order for the wall thermostat to function Set point Temperature Limits Provides a restricted range of temperature control Heat and Cool Fan CON CYC DIP switches Allows the fan to operate in continuous or cycle mode while the unit is in heating or cooling mode o Continuous CON Allows fan to run continuously circulating a...

Страница 22: ...lack White Black White PTAC 1 PTAC 2 PTAC N SUGGESTIONS 1 To size a transformer use the followingequation Quantity of PTAC units x 1 VA Transformer Size VA Example 110 PTAC units x 1 VA 110 VA Transformer 2 Below are the American Wire Gauge AWG recommendedsizes AWG WIRE SIZE NO MAX LENGTH FT 24 400 22 600 20 900 18 1500 16 2000 ...

Страница 23: ...t Pump Cycle 7 Electronic Function 7 1 Terms and Definitions T1 Temperature of indoor ambient T2 Temperature of evaporator T3 Temperature of condenser T4 Temperature of outdoor ambient TS Set temperature DAT Discharge air temperature T5 DAT Discharge air temperature T6 LIQUID SIDE CHECK VALVE Heating Model only CAPILIARY TUBE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER GAS SIDE ACCUMULATOR RE...

Страница 24: ...or is off when compressor is off Except the T2 high Temp protection If there is only one speed for the fan motor use the high speed instead of the low speed 7 4 2 The fan motor operating in cooling only mode see Fig A If T4 T01 and lasts for 1 minute the fan motor will operate at high speed If T4 T02 and lasts for 1 minute the fan motor will operate at low speed If T02 T4 T01 o If fan motor was in...

Страница 25: ...t initialspeed 7 4 4 The high temperature protection of evaporator at heat pump and cooling mode If T2 TE7 the unit will turn the protection of compressor off and stop this protection when T2 TE9 If T2 TE8 it will turn the protection of fan motor off and stop this protection when T2 TE9 If T2 TE15 fan motor will operate at low speed by force then stop and determine the high or low speed according ...

Страница 26: ...urn on and operate at low speed After 30 seconds it will change to the set speed If the DAT temperature is higher than the protection temperature when the heater is operating the fan motor will turn off automatically If T1 2 F more than Ts and the heater is off and the fan motor will continue working at set speed If the DAT temperature is lower than the protection temperature and the fan motor has...

Страница 27: ...t pump The four way valve is always on If T1 Ts 2 F the compressor is on If T1 Ts 2 F the compressor will be off The fan motor also works in correlation to whether the compressor is in operation If T2 TE7 the compressor will turn off When the DAT protection is triggered it will prevent the compressor from operating 7 6 DIP Switches and Jumper Selection Note This switchboard is optional 8 Operation...

Страница 28: ...30V units and be within reach of the service cord The standard cord connected 265V units require an accessory electrical subbase for operation Power Cord Protection The power cord for 230 208v units provide power cord fire protection The unit s power automatically disconnects when unsafe conditions are detected Power to the unit can be restored by pressing the reset button on plug Upon completion ...

Страница 29: ...P 07EEN1 MK9 MWDUP 09AEN1 MK3 6 20P 20A 240V MWDUP 09EEN1 MK3 MWDUP 12AEN1 MJ5 6 30P 30A 240V MWDUP 12EEN1 MJ7 MWDUP 15AEN1 MI6 MWDUP 15EEN1 MI5 265 V 265 V MWDUP 07AEN1 UK9 7 20P 20A 277V MWDUP 07EEN1 UK9 MWDUP 09AEN1 UK3 MWDUP 09EEN1 UK3 MWDUP 12AEN1 UJ5 7 30P 30A 277V MWDUP 12EEN1 UJ7 MWDUP 15AEN1 UI6 MWDUP 15EEN1 UI5 115V MWEUP 09EEN1 BK3 5 15P 15A 120V MWEUP 12EEN1 BJ7 ...

Страница 30: ...temperature sensor Lo Temperature is lower than display range 32 F HI Temperature is higher than display range 99 F E4 Communication malfunction between main control board and display board LE Drive by wire control failure 10 2 Troubleshooting 10 2 1 Open circuit or short circuit of temperature sensor diagnosis and solution AS E5 CS oS HS Error Code AS ES CS OS HS Malfunctioning conditions If the ...

Страница 31: ...www mideaaircon com 29 T5 T T4 T3 T2 T1 ...

Страница 32: ... 120 seconds Possible causes Wiring error Faulty display board Faulty main control board Troubleshooting Communication malfunction between main control boardand display board Replace the main control board Check signal wire between the display board and main board Is it properly connected No Yes Reconnect and retry Is error still showing No Yes Replace display board Is error still showing No Yes T...

Страница 33: ...al or the 4 way valve and compressor signals are on at the same time Possible causes Wiring error Faulty wire controller Wire controller doesn t match Troubleshooting DIP Switch Terminal Designation 24V Controller FC L Front desk control terminal L FC N Front desk control terminal N LOW FAN Low fan speed GL HI FAN High fan speed GH 4 WAY 4 way valve for heat pump model B HEAT2 Electrical heater 2 ...

Страница 34: ...for C instead of F UNIT MAKING NOISES Clicking gurgling and whooshing noises are normal during operation WATER DRIPPING OUTSIDE If a drain kit has not been installed condensation runoff during hot and humid weather is normal See Note 2 below If a drain kit has been installed and is connected to a drain system check gaskets and fittings around drain for leaks and plug them WATER DRIPPING INSIDE Wal...

Страница 35: ...3 127 3 0707 0 32 35 2024 27 81 9 1245 54 129 2 959 1 33 8 33 3269 28 82 8 7198 55 131 2 8442 2 35 6 31 5635 29 84 8 3357 56 133 2 7382 3 37 4 29 9058 30 86 7 9708 57 135 2 6368 4 39 2 28 3459 31 88 7 6241 58 136 2 5397 5 41 26 8778 32 90 7 2946 59 138 2 4468 6 42 8 25 4954 33 91 6 9814 60 140 2 3577 7 44 6 24 1932 34 93 6 6835 61 142 2 2725 8 46 4 22 5662 35 95 6 4002 62 144 2 1907 9 48 2 21 8094...

Страница 36: ...GD Midea Air Conditioning Equipment Co Ltd RAC Overseas Sales Company Midea headquarter building No 6 Midea Avenue Beijiao ShunDe Foshan GuangDong P R C 528311 Website www mideaaircon com ...

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