Mitsubishi FDC 6 Series Service Manual Download Page 29

Page: 29 / 34

Parts layout on the outdoor unit PCB

SW4

OFF

Function

SW5

OFF

Function

• Function of DIP switched (SW4)

• Function of DIP switched (SW5)

1 Phase model

3 Phase model

–

Rotary

Reciprocal

Scroll

OFF

(J5)

(J4)

OFF

4 (J9)

Spare

Compressor
unit
switching

1 (J3)

Defrost Switching

Actual spot

Ordinary

Enabled

Disabled

Test run

Normal

Test run for heating

Test run for cooling

Snow protection control

Test run Switch

Name

J21

With

None

Function

• Function of jumper wire

Service valve open/close check control enabled.

Service valve open/close check control disabled.

SW6

OFF

Function

• Function of DIP switched (SW6)

4-Way Valve Control

Enabled

Disabled

14˚C

18˚C

Enabled

Disabled

Enabled

Disabled

Defrost Circulation

Temperature Switching

63HI Abnormal

detection switching

3 minute delay when power

is turned on Switching

(J17)

(J18)

(J19)

(J20)

X01

R10

X05

X09

X08

CNA2

X07

X02

CNF

X03

X04

R12

R11

SW5

SW3

52C

20S

SV2

CF1

CF2

63H1

63H2

CNA1

CT1

CNL

CNQ

CNE

CNR

LED-D

LED-R

J20

SW6

J19

J18

J17

SW4

PCB power supply connector

(Primary side)

PCB power supply connector

(Secondary side)

Inspection display lamp

(LED·Red)

Inspection display lamp

(LED·Green)

SW5

SW3

SW6

SW4

Summary of Contents for FDC 6 Series

Page 1: ...ems and to provide information for maintenance and fault finding Including outdoor unit FDC 6 Series and 8 Series AIR CONDITIONING HEAT PUMP SYSTEMS S E R V I C E G U I D E FDT 4 Way Cassette FDEN Ceiling Suspended FDKN Wall Mounted FDR Ducted Cassette FDU Ducted High Static ...

Page 2: ...puter Control Function Page 3 Operation Control Function by the Wired Remote Controller Page 11 Operation Control Function by the Outdoor Controller Page 12 Safety Precautions Page 16 Maintenance Pages 17 31 Servicing Page 17 Troubleshooting for Refrigeration Circuit Page 18 Diagnosing of Microchip Circuit Page 19 ...

Page 3: ...nder Signals are sent to the air conditioner from here Filter reset indicator The FILTER mark is indicated when the FILTER RESET button is pressed Temperature indicator Set temperature is indicated Timer OFF time Indicated the timer OFF time When the timer mode is CONT or OFF there is no indication ON OFF button When the button is pressed the air conditioner is started and when the button is press...

Page 4: ...when servicing the unit Operation mode display Displays the operation mode that has been selected Cooling only air conditioner has the display of COOL DRY and FAN only Fan speed display Displays the fan speed that has been set Operation Inspection indicator lamp During operation Green lamp flashes In case of error Red lamp flashes On Off switch Use this switch to start or stop the air conditioner ...

Page 5: ...it is switched automatically to the cooling operation For an hour after this switching the heating operation is suspended regardless of the temperature as shown at left Temperature difference between thermostat set temp and return air temp Detected by ThI A Note 1 ON OFF According to control other than temperature control Thermostat ON Cooling Fan Heating Dry Control part Compressor 4 way valve Ou...

Page 6: ...k to provide cooling op eration for the dehumidifying Operation block D C B A Set temp by thermostat Pattern of operation Operation block Thermal drying starting for 8 or 16 minutes after operation started A 16 minutes Cooling operation Thermostat ON Indoor fan operating with the setting air flow When the thermostat is turned off the indoor fan operates for 30 seconds with the Lo operation in the ...

Page 7: ... start terminates and it returns to the setting airflow of the blower 2 If the indoor heat exchanger temperature is lower than 30 C when the unit is heating under the thermo ON condition the indoor fan operates in the Lo mode As the temperature rises higher than 30 C or 7 minutes after the beginning of hot start the hot start terminates and it returns to the setting air flow 8 Indoor fan control d...

Page 8: ...ted after the start of heating operation exceeds 30 minutes 2 When the compressor operation time accumulated after the end of defrost operation exceeds 45 minutes 3 When the defrost thermostat 23DH1 is turned ON 6 C b Defrost terminating condition If the defrost thermostat 23DH2 is turned OFF 12 C or 12 minutes after the start of defrost operation the defrost opera tion is canceled and it returns ...

Page 9: ...ble to start three minutes after the power restoration Furthermore if the timer was operating prior to the power interruption the unit remains stopped even after the restoration of service Note 1 Becomes invalid if the dip switch SW3 1 on the indoor PC board is at OFF SW3 1 is set at ON when unit is shipped from the factory 16 Thermistor disconnection detection control a Detection of indoor return...

Page 10: ...here is restarting of the compressor 52C ON Moreover during stoppage of the compressor the Run lamp green blinks 2 times Note 1 When starting the compressor for the first time after turning the operational switch ON there is starting regardless of the power source voltage Furthermore if dip switch SW 3 2 on the internal substrate is OFF this becomes invalid Switch SW 3 2 is set to ON upon shipment...

Page 11: ...uto swing the position displayed on the LCD changes but the positions of the louvers and the display are not coordinated The louvers swing 3 4 times per minute but the display changes once per second Stopping the louvers When the AUTO SWING key is pressed to stop the louver movement the LCD louver position display stops and the louvers stop when they come to the position displayed on the LCD There...

Page 12: ...outline Route the wire connecting each of the indoor and outdoor units as it would be for each unit Use the terminal block X Y Z for the remote control for the group controller and use a jumper wire among each of the rooms Notes 1 The unit number is set by a switch SW1 on the circuit board for the indoor unit 2 If unit number is not important random can be used However setting in order from 0 1 2 ...

Page 13: ...i The following is the sequence of operation for the remote controller operation mode switch ii CPU reset This functions when the inspection and filter reset switch on the remote controller are pushed simultaneously It operates in the same manner as the power reset iii Power outage compensation function This is enabled by setting dip switch SW3 on the remote control circuit board to ON It records ...

Page 14: ...or air temperature C 9 19 17 E Zone A Zone 3 Heat exchanger temperature C 0 C Zone D Zone b Heating Operation 1 Stop control for outdoor fan When the high pressure switch 63H2 operates the fan for the outdoor unit is stopped to control the high pressure switch 63H2 settings Models FDC208 1008 type 2 5 OFF 2 06 ON MPa 25 5 OFF 21 ON kgf cm2 2 Tap control for outdoor fan When the high pressure switc...

Page 15: ...With 4 way selector valve OFF during heater operation Defrost operation is performed with the compressor on the fan for the outdoor unit off and the 4 way selector valve on b Defrost finished i Once defrost operation has started it will finish after the cumulative operating time of the compressor has reached 12 minutes factory setting SW5 1 OFF Note 1 This time will become 14 minutes if the DIP sw...

Page 16: ... 5 seconds and when it is more than the set value detection at current sensor CT the compressor is stopped The compressor is restarted after a 3 minute delay if the detection current is less than 1 5 to 2A If this condition is re detected 5 times within 60 minutes of the first occurrence an abnormal stop of the unit is performed ii If 60 minutes passes and the detected current after the first to t...

Page 17: ...rates due to a rise in the windings of the compressor motor The setting values of the internal thermostat 49C are 90 C open and 73 C close 8 Control of the closing and opening of the service valve Only heat pump type a When the compressor is ON for the first time after turning on the power the heating operation starts regardless of any setting b If the 63H2 turns OFF open within 10 seconds after t...

Page 18: ...ntly support heavy weight When strength is insufficient injury can result from a falling of the unit Execute the prescribed installation construction to prepare for earthquakes and the strong winds of typhoons and hurricanes etc Improper installations can result in accidents due to a violent falling over of the unit For electrical work please see that a licensed electrician executes the work while...

Page 19: ...port of the gas piping Close high pressure valve 2 of gange mani fold c Connect the charging hose A to a vecuum pump Repeat evacuation in the following sequence Notes 1 Do not use the refrigerant pressure to expel air 2 Do not use the compressor for evacuation 3 Do not operate the compressor in a vacuum condition Start the vacuum pump h Compond pressure gauge indicates 0 1 MPa 76 cmHg h Operate th...

Page 20: ...ting condition by operation pressure and temperature difference Making an accurate judgement requires a skill that is acquired only after years of experience one trouble may lead to an another trouble from a single trouble source and several other troubles may exist at the same time which comes from a undetected different trouble source Filtering out the trouble sources can be done easier by compa...

Page 21: ...perating conditions Indoor unit heat exchanger thermistor Indoor unit circuit board Failure in drainage Float switch Number of indoor units connected Insufficient refrigerant Check indicator table Table of inspection items based on error codes Note 1 Inspection LED display has a cycle of 8 seconds flashing time of 0 5 seconds ii Only case of wired remote control model Failure mode on the indoor un...

Page 22: ...of indoor unit microcomputer printed circuit board Microcomputer printed circuit board can be replaced with following procedure i Confirm the parts numbers Refer to the following parts layout drawing for the location of parts number Parts number PJA505A069 PHA505A007 Model FDKN P 258 308 FDT FDR FDU FDFL Parts number PHA505A008 PJA505A092Z Model FDTN P FDEN P FDKN P 208 Transformer primary side Po...

Page 23: ...ermostat is OFF ii Please match the settings of control switching switches SW3 SW4 SW5 to the settings they had before they were replaced With these switches if the printed circuit had a jumper wire before being replaced set to jumper wire ON if there was a jumper wire and jumper OFF is these was not iii Connect the fast on terminals and connectors that are to the circuit board for the micro compu...

Page 24: ...en wire Defective return air thermistor Replacement Defective indoor unit PCB Replacement Defective return air thermistor input circuit 2 Indoor unit Check Lamp yellow 2 time flashes Note 1 Characteristics as per the above graph YES YES YES NO Is there any overflow NO Is the float switch tripper Note 1 Check if power source is there between DM connectors Is the angle of drain piping good Is there ...

Page 25: ...fer to previous page for heat exchanger thermistor tempera ture resistance characteristic values YES YES YES NO NO Does the voltage oscillate between DC6 and 10V between control switch circuit board connector CnB Y White to Z Black Does the voltage oscillate between DC6 and 10V between indoor unit PCB connector CNB 2 White to 3 Black YES NO NO Is there DC 10 8V between control switch circuit board...

Page 26: ...tive return air thermistor Replacement Defective indoor unit PCB Replacement Defective return air thermistor input circuit Note 1 Characteristics as per the above graph 2 Error display e 6 Defective indoor unit heat exchanger thermistor 3 Error display e 7 Defective return air thermistor YES YES NO NO Are the heat exchanger thermistor characteristics OK is there no short circuit YES NO Is the indo...

Page 27: ...Are there any DM connector loose Are there any PCB faston terminal loose Are there any DM wire broken Repair 7 Error display e 57 Insufficient refrigerant Note 1 Refer to previous page for heat exchanger thermistor heat resistance characteristic values Are the heat exchanger thermistor characteristic normal YES NO NO Defective heat exchanger thermistor Replacement Is the unit normalized Defective ...

Page 28: ...ge gas thermistor or imperfect connection of the connector The wiring secondary wiring of 52C to the compressor is open 4 Outdoor unit side FDC P 208 508 type FDC808 1008 type Failure mode on the outdoor unit is indicated by flashing both Green LED LED G and Red LED LED R on the printed circuit board Check Indicator Table Parts No PCA505A046ZN Model 1 phase model Parts No PCA505A046ZS Parts No PCA...

Page 29: ...ve open close check control disabled SW6 ON OFF ON OFF ON OFF ON OFF Function Function of DIP switched SW6 4 Way Valve Control Enabled Disabled 14 C 18 C Enabled Disabled Enabled Disabled Defrost Circulation Temperature Switching 63HI Abnormal detection switching 3 minute delay when power is turned on Switching 1 J17 2 J18 3 J19 4 J20 X01 F1 R10 X05 X09 X08 CNA2 X07 X02 CNF X03 X04 R3 R12 R11 R8 R...

Page 30: ... operating At heating Is FM1 operating Is the service valve gas side opened fully Is the filter clogged Is it overcharged Is the installation space of indoor outdoor unit adequate Is there any short circuit on the indoor outdoor unit 2 Overcurrent of the compressor motor Note 1 Measure and check the current value Confirm that the overcurrent setting by SW3 of outdoor unit PCB is correct Outdoor un...

Page 31: ...ere any broken wire Defective outdoor unit heat exchanger thermistor Replacement Defective outdoor unit PCB Replacement Defective outdoor unit heat exchanger thermistorinput circuit Outdoor unit heat exchanger thermistor ThO R Resistance temperature characteristics Resistance kΩ Note 1 22kΩ at 6 C 6 Defective outdoor unit heat exchanger thermistor Outdoor unit Red LED Green LED 1 time flash 1 time...

Page 32: ...7 Defective outdoor temperature thermistor Outdoor unit Red LED Green LED 2 time flashes 1 time flash Temperature T T 80 C T 80 C 100 50 0 10 5 0 0 C 50 C 20 C 80 C 100 C 120 C Is the discharge gas thermistor connector connection OK NO YES Repair Are the discharge gas thermistor characteristics OK is there no broken wire Defective discharge gas thermistor Replacement NO YES Defective outdoor unit ...

Page 33: ...At 49C operation During cooling heating Isn t there insufficient refrigerant Isn t there gas leakage Isn t there a missing phase L1 or L2 phase 63H1 49C operation Only case of FDC808 1008 type 10 Red LED Green LED 5 time flashes 1 time flash Outdoor unit Failure to open the service valve This abnormality will be indicated only when the compressor is ON for the time after turning on the power Refer...

Page 34: ...irective 89 336 EEC LV Directive 73 23 EEC 3D Air Sales Ltd Sales Marketing Office 850 Brighton Road Purley Surrey CR8 2BH Telephone 020 8668 1112 Facsimile 020 8668 1113 3D Air Sales Ltd Warehouse Sales Admin Spares Warranty Anglia House Priors Way Coggeshall Essex CO6 1TL Telephone 01376 565 505 Facsimile 01376 565 525 3D Air Sales Ireland Ltd Unit 21 Western Industrial Estate Nass Road Dublin12...

Search results

Summary of Contents for FDC 6 Series

Reviews:

Related manuals for FDC 6 Series

Brands by name

Popular brands

Mitsubishi FDC 6 Series, Service Manual

Search results

Summary of Contents for FDC 6 Series

Reviews:

Related manuals for FDC 6 Series

Brands by name

Popular brands