Mitsubishi Electric PK-2.5FLD Page 40 Technical & Service Manual Download

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No.

Part No.

Part name

Specification

Unit Amount

Remarks.

(Drawing No.)

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Q'ty/set

PK-4

Price

FAN MOTOR

RUBBER MOUNT

MOTOR BAND

MOTOR LEG

RIGHT LINEFLOW FAN

LEFT LINEFLOW FAN

SLEEVE BEARING

(BG02H065H01)

(BG02H178H01)

(BG02A534H17)

FLSD

T7W 571 762

R01 16G 105

—

R01 17G 115

R01 17G 114

R01 005 103

R01 12G 103

27 28

PK-4FLSD

PK-4FLSD
PK-4FLSD

ELECTRICAL PARTS
PK-4FLSD
PK-4FLSD

PK-4FLSD

OC232--2.qxp 01.10.1 8:58 PM Page 40

Summary of Contents for PK-2.5FLD

Page 1: ... 3FLD1 PK 3FLD2 PK 4FLSD PK 4FLD PK 4FLSD1 PK 4FLSD2 No OC232 REVISED EDITION A 2000 Indoor unit Wall Mounted Series PK TEMP ON OFF NOT AVAILABLE AM PM AM PM C REMOTE CONTROLLER PK P2 5FLD1 PK P3FLD1 PK P4FLSD1 PK P2 5FLD2 PK P3FLD2 and PK 4FLSD2 are added in REVISED EDITION A Please void OC232 This manual does not cover the following outdoor units When servicing them please refer to the service m...

Page 2: ... changed by changing its shape BOX ASSEMBLY has changed by changing its shape CENTER SUPPORT has changed by changing its shape DRAIN PAN has changed by changing its shape PK 2 5FLD1 PK 2 5FLD2 PK 3FLD1 PK 3FLD2 PK 4FLSD1 PK 4FLSD2 The parts No of REMOTE CONTROLLER has changed The following parts numbers are interchangeable T7W 570 200 T7W E06 714 TEMP ON OFF NOT AVAILABLE AM PM AM PM C 2 COMBINATI...

Page 3: ...lects low or high fan speed VANE CONTROL button VANE CONTROL button regulates the vertical distribution of airflow display SET TEMP display indicates desired tempera ture set CLOCK display DIsplays the current time display Flashes when the current time is displayed TIMER display Displays when in timer operation or when set ting timer display Displays the order of timer operation display Displays w...

Page 4: ...E button sets any desired room temperature CLOCK display Displays the current time display Displays the order of timer operation display Displays whether timer is on or off Buttons used to set the hour and minute of the current time and timer settings h and min buttons display SET TEMP display indicates desired temper ature set display FAN SPEED display indicates which fan speed has been selected ...

Page 5: ... factor Starting current External finish Heat exchanger Fan drive o No Fan motor output Airflow Low High External static pressure Booster heater Operation control Thermostat Noise level Low High w2 Unit drain pipe O D Dimensions Weight Service Ref Power supply phase cycle voltage Input Running current Power factor Starting current External finish Refrigerant control Compressor Model Motor output S...

Page 6: ...al finish Heat exchanger Fan drive o No Fan motor output Airflow Low High External static pressure Booster heater Operation control Thermostat Noise level Low High w2 Unit drain pipe O D Dimensions Weight Service Ref Power supply phase cycle voltage Input Running current Power factor Starting current External finish Refrigerant control Compressor Model Motor output Starter type Protection devices ...

Page 7: ...ent External finish Heat exchanger Fan drive o No Fan motor output Airflow Low High External static pressure Booster heater Operation control Thermostat Noise level Low High w2 Unit drain pipe O D Dimensions Weight Service Ref Power supply phase cycle voltage Input Running current Power factor Starting current External finish Refrigerant control Compressor Model Motor output Starter type Protectio...

Page 8: ...LJSA2 PU 4YJSA3 PU 4TJSA2 60Hz Power supply 1 Phase V 220V 50Hz V 230V 50Hz Service Ref PK 2 5FLD PK 2 5FLD1 PK 2 5FLD2 0 44 0 095 0 7 PU 2 5 PK 3FLD PK 3FLD1 PK 3FLD2 0 44 0 095 0 7 PU 3 PK 4FLSD PK 4FLSD1 PK 4FLSD2 0 53 0 114 0 8 PU 4 PK 2 5FLD PK 2 5FLD1 PK 2 5FLD2 0 44 0 095 0 8 PU 2 5 PK 3FLD PK 3FLD1 PK 3FLD2 0 44 0 095 0 8 PU 3 PK 4FLSD PK 4FLSD1 PK 4FLSD2 0 53 0 114 0 8 PU 4 Current Input ...

Page 9: ...6 8 7 3 7 6 7 7 7 8 8 3 1 03 1 06 1 07 1 08 1 08 1 11 8 9 9 5 9 9 10 0 10 2 10 9 1 03 1 06 1 07 1 08 1 08 1 11 6 0 6 4 6 7 6 8 6 9 7 4 1 04 1 06 1 08 1 08 1 09 1 12 6 8 7 3 7 5 7 6 7 8 8 3 1 04 1 06 1 08 1 08 1 09 1 12 8 9 9 5 9 8 9 9 10 1 10 8 1 04 1 06 1 08 1 08 1 09 1 12 5 8 6 2 6 4 6 5 6 6 7 1 1 10 1 12 1 14 1 15 1 16 1 20 6 5 7 0 7 2 7 3 7 5 8 0 1 10 1 12 1 14 1 15 1 16 1 20 8 5 9 1 9 4 9 5 9...

Page 10: ... 2 7 6 7 9 8 0 8 1 8 6 PK 3FLD PK 3FLD1 PK 3FLD2 T C C F T I 8 2 8 7 9 0 9 1 9 3 9 8 PK 4FLSD PK 4FLSD1 PK 4FLSD2 T C C F T I 11 5 12 1 12 5 12 7 12 9 13 7 7 0 7 5 7 7 7 8 8 0 8 5 8 0 8 6 8 9 9 0 9 1 9 7 11 2 11 9 12 3 12 5 12 7 13 5 6 8 7 2 7 4 7 6 7 7 8 2 7 7 8 3 8 5 8 7 8 8 9 4 10 8 11 5 11 9 12 1 12 2 13 0 6 6 7 0 7 3 7 4 7 5 8 0 7 6 8 1 8 4 8 5 8 7 9 2 10 6 11 2 11 6 11 8 12 0 12 8 6 5 6 9 7 ...

Page 11: ...13 0 35 24 PU 3VJC COOLING 6 900 4 19 1 60 220 0 44 1 60 220 20 9 2 07 21 1 0 44 4 49 70 53 4 5 29 19 13 2 46 24 PU 3NJA1 COOLING 10 300 3 46 PK 4FLSD PK 4FLSD1 PK 4FLSD2 1 50 220 0 53 3 50 380 5 7 1 80 18 4 0 48 4 89 65 49 6 5 27 19 13 6 35 24 PU 4YJSA3 COOLING 9 900 5 08 1 60 220 0 53 3 60 220 14 0 1 93 19 7 0 45 4 59 74 52 5 5 29 19 13 2 46 24 PU 4TJSA2 Total Electrical Circuit Refrigerant circ...

Page 12: ...air is blown out horizontally from the unit at the Hi notch position The coverage range should be used only as a general guideline since it varies according to the size of the room and furni ture inside the room Airflow Air speed Coverage rangew Airflow Air speed Coverage rangew m3 min m sec m ft m3 min m sec m ft 60Hz 50Hz Frequency Configuration Wall mounted Service Ref 20 4 9 12 4 41 20 4 9 12 ...

Page 13: ...74 4 39 100 30 37 74 4 29 80 280 30 30 184 30 60 10 39 37 65 100 A B C Knock out hole for piping 25 1110 183 240 B 1120 552 55 120 107 111 Air outlet 552 Air outlet Change vane manual Under panel Removable at left hand side piping Knock out hole for under piping Refrigerant pipe Drain pipe Rear piping opening Range for left rear piping opening 12 ø6 hole for tapping screw 66 ø6 hole for tapping sc...

Page 14: ... 74 4 29 80 280 30 30 184 30 60 10 39 37 65 100 A B C Knock out hole for wiring 25 1110 183 240 B 1400 55 120 102 111 694 Air outlet 694 Air outlet Change vane manual Under panel Removable at left hand side piping Knock out hole for under piping Refrigerant pipe Drain pipe Rear piping opening Range for left rear piping opening Range for left rear piping opening 12 ø6 hole for tapping screw 84 ø6 h...

Page 15: ... The indoor unit heat exchanger may freeze fig w2 fig w1 220V 230V 240V 230V 220V RED ORANGE YELLOW 1 ON OFF 2 3 4 5 6 7 8 1 ON OFF 2 3 4 5 6 7 8 SW1 SW1 SYMBOL C CN2 I B CN2A I B CN2B I B CN27 I B CN28 I B CN51 I B F1 2 I B I B JR NAME FAN MOTOR CAPACITOR TIMER ADAPTOR CONNECTOR TRANSMISSION WIRES No 1 CONNECTOR TRANSMISSION WIRES No 2 CONNECTOR DRAIN LIFE UP MECHANISM TIME SHORTENING CONNECTOR M...

Page 16: ...cs PU 4 O D 3 2 I D 2 0 L840 2pcs Capillary tube size Ball valve strainer Indoor heat exchanger Distributor with strainer Pipe temperature thermistor RT2 Indoor heat exchanger Distributor with strainer Flexible tube Flared connection Flared connection Refrigerant pipe 15 88 5 8 with insulator option Refrigerant pipe 9 52 3 8 with heat insulator option Ball valve Low pressure switch Charge pIug Che...

Page 17: ...on the unit stops operation by pressing the ON OFF switch In addition operation can be turned ON OFF with the centralized remote controller or the remote switch Note2 The factors which cause abnormal operation mode are as follows Outdoor unit abnormal operation Fault of room temperature thermistor RT1 Fault of pipe temperature thermistor RT2 Indoor coil frost protection mode Fault of drain sensor ...

Page 18: ...elease Coil frost prevention set Compressor OFF Compressor ON Compressor thermostat ON Allowance release Allowance 6 minute time delay Coil frost protection check mode Continue 1 minute Fan speed LOW Fan speed LOW 5 minutes elapse Outdoor unit abnormality check mode Allowance set 2 COOL operation Note5 The thermostat is continuously ON during the test run Note6 Refer to page 20 for coil frost prot...

Page 19: ...ing the compressor ON and stops during the compressor OFF 3 DRY operation Dry operation Room temperature 18 C or below Compressor ON Compressor ON 3 min elapse Compressor thermostat ON Compressor ON time completed Compressor OFF 10 minute timer start Compressor OFF Fan stop Compressor ON 3 min delay YES YES YES YES YES YES YES YES Note 10 Note 10 Note 5 Note 5 Note 9 Note 8 YES NO NO NO NO NO NO N...

Page 20: ...LCD lights 12VDC Indoor unit Receives orders from remote controller and temperature data from indoor unit Processes orders and data Controls indoor and outdoor operation Self diagnostic function w System control operation Optional w Emergency operation Fan ON OFF Fan speed HIGH LOW AUTO vane s angle setting Emergency stop INPUT from outdoor unit Compressor protection device working OUTPUT from out...

Page 21: ...r than the set temperature 3 The compressor stops in check mode or during protective functions 4 Coil frost prevention To prevent indoor coil frost the compressor will stop when the pipe temperature thermistor RT2 reads 1 C or below after the compressor has been continuously operated for 16 minutes or more The coil frost prevention is released under any of the following conditions The pipe tempera...

Page 22: ...m temperature RANGE C The pipe temperature is more than 5 degrees below room temperature 5 AUTO VANE CONTROL 1 1 Frequency judgement When the unit operates for the first time after the circuit breaker turned to ON the frequency 50Hz or 60Hz is judged by the horizontality sensing switch If The frequency cannot be judged immediately for some reason the sensing operation continues for 3 minutes with ...

Page 23: ...ompressor stops in check mode or during protective functions 4 The compressor will not start when the room temperature is below 18 C The compressor starts intermittent operation when the power is turned ON with room temperature above 18 C The compressor ON OFF time depends on the thermo stat ON OFF and the room temperature as follows After 3 minute compressor operation If the room temperature ther...

Page 24: ...n control The indoor fan speed depends on the remote controller setting 2 Auto vane control The auto vane position depends on the remote controller set ting ON OFF TEMP FAN VANE TEST RUN AUTO STOP AUTO START h min LOUVER MODE CHECK RESET SET CLOCK MODELSELECT NOT AVAILABLE CHECK TESTRUN C AMPM AMPM ON OFF NOT AVAILABLE AM PM AM PM C MODE FAN VANE STOP START CLOCK HR MIN ON OFF TEMP FAN VANE TEST R...

Page 25: ...oved Display will start finishing For operations marked point the transmitter to the wireless receiver and make sure that you will hear a short beep from the receiver 2 5 Test run ON OFF TEMP FAN VANE MODE CHECK LOUVER TEST RUN AUTO STOP AUTO START h min TESTRUN RESET SET CLOCK 6 4 A 5 2 3 Test run Measure an impedance between the power supply terminal block and ground with a 500V Megger and check...

Page 26: ...witch on indoor controller board 1 Jumper wire 1 JR01 Jumper wire for the auto vanes Cut JR01 for the unit WITHOUT auto vanes 2 JR02 Jumper wire for the temperature to start coil frost prevention Cutting JR02 changes the temperature from 1 C to 3 C 3 JR03 Jumper wire for set temperature adjustment in HEAT mode In HEAT operation heated air stagnates in the upper part of the room The indoor unit ins...

Page 27: ... 1 7 8 ON OFF 2 7 8 ON OFF 3 7 8 ON OFF 2 SW2 Unit switch SW2 1 Switch for air conditioner with or without electric heater ON Unit with electric heater OFF Unit without electric heater SW2 2 Switch for air conditioner with or without heat pump ON Unit with heat pump OFF Unit without heat pump SW2 3 SW2 4 SW2 5 Switch for function code 3 4 5 ON OFF PK 2 5 PK 3 PK 4 1 2 3 ON OFF 1 2 3 ON OFF 3 SW3 E...

Page 28: ... button A ON OFF TEMP FAN VANE MODE CHECK LOUVER TEST RUN AUTO STOP AUTO START h min RESET SET CLOCK MODELSELECT 4 A 5 1 4 Model No 1 Turn on the main power to the unit 2 Press the SET button with the point of a ball point pen or the like Start this operation from the status of remote controller display turned off blinks and Model No is lighted 3 Press the button twice continuously A Pair No 0 bli...

Page 29: ...mpleting a test run be sure to turn the adjusting switch back to Nrm 1 Self diagnostic function for PK 2 5FLD 1 PK 3FLD 1 PK 4FLSD 1 1 2 4 5 6 8 9 Irregular intake sensor The number of ON OFF lamp Unit display blinking and buzzer sound Irregular point Irregular piping sensor Irregular drain sensor Irregular drain pump Freezing protected Irregular outdoor unit NO irregular For operations marked poi...

Page 30: ...anes do not work Auto vane motor does not work Connector is poorly connected Auto vane motor is poorly assembled Indoor controller board is damaged Auto vane motor is damaged Auto vane motor relay is damaged Power ON OFF button is not available Indoor outdoor connecting wire is connected incorrectly Indoor outdoor connecting wire shorts Compressor protector is damaged Outdoor controller board is d...

Page 31: ...wiring of indoor outdoor connecting wire 2 Reversed phase 3 Protection device is working 1 Check the indoor outdoor connecting wire 2 Change the connection of electric wiring 3 Check the protection device 1 2 Abnormality of room temper ature thermistor RT1 Abnormality of pipe tempera ture thermistor RT2 1 Bad contact of thermistor 2 Damaged thermistor 1 Check the thermistor 2 Measure the resistanc...

Page 32: ... 2 3 1 2 3 4 CNT T CN4T BRN RED WHT YLW 1 1 3 3 5 5 Red White Black Relay connector Protector OFF 130i5 C ON 80i20 C Parts name Check points 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Thermistor for lower temperature Temperature Resistance K Thermistor Characteristic graph Room temperature thermistor RT1 Pipe temperature thermistor RT2 Thermistor R0 15k 3 Fixed number of B 3480k 2 Rt 15exp 3480 0 15k...

Page 33: ... electrical box cover and remove the cover 3 Disconnect the connectors on the indoor controller board 4 To unhook the catches on the right hand side of the indoor controller board pull the left hand side toward you and lift up the cover to the right Then the indoor controller board can be removed 4 Removing the electrical box 1 Remove the right side panel 2 Remove the screw of the electrical box c...

Page 34: ...ook the catch on the panel from the catch on the unit 2 Slide the left side panel to the left to remove the panel Note Fix the unit to the metal fixture securely 3 Remove the air filters 4 Hold and press the centre cover 5 Remove the screws of the grille 6 Pull the lower side of the grille toward you and slide the upper to the right to remove the grille 7 Removing the drain pan 1 Remove the left a...

Page 35: ...t and right motor supports and remove the motor supports and the fan motor See Photo 9 8 Remove the screw of the centre support and remove the support See Photo 10 9 Remove the 2 screws on the left and right sides of the heat exchanger and pull the bearing support toward you See Photo 11 10 Pull the left hand side of the heat exchanger toward you and remove the lineflow fan Photo 10 Lineflow fans ...

Page 36: ...E PANEL LEFT SIDE PANEL WIRELESS ADAPTER INTAKE GRILLE AIR FILTER NOSE NOSE UNDER PLATE TOP PLATE DRAIN SOCKET BACK PLATE BOX ASSEMBLY BOX ASSEMBLY RECEIVER BG00A593GM3 RG00A734G61 PK 2 5 FLD1 PK 3 1 1 1 2 4 1 1 1 1 1 1 1 FLD 1 1 1 2 4 1 1 1 1 1 1 1 FLD2 FLD1 FLD2 1 1 1 2 4 1 1 1 1 1 1 1 1 1 1 2 4 1 1 1 1 1 1 1 FLD 1 1 1 2 4 1 1 1 1 1 1 1 1 1 1 2 4 1 1 1 1 1 1 1 Part number that is circled is not ...

Page 37: ... 641 R01 12G 523 R01 16G 808 R01 24K 658 RIGHT SIDE PANEL LEFT SIDE PANEL WIRELESS ADAPTER INTAKE GRILLE INTAKE GRILLE AIR FILTER NOSE NOSE UNDER PLATE TOP PLATE DRAIN SOCKET BACK PLATE BOX ASSEMBLY BOX ASSEMBLY RECEIVER BG00A593GM4 RG00A734G62 FLSD2 1 1 1 2 1 5 1 1 1 1 1 1 1 FLSD 1 1 1 2 1 5 1 1 1 1 1 1 1 FLSD1 PK 4 1 1 1 2 1 5 1 1 1 1 1 1 1 Part number that is circled is not shown in the figure ...

Page 38: ...02H065H01 BG02H178H01 BG02A534H16 MF FLD1 FLD FLD FLD1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 FLD2 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 FLD2 1 2 1 1 1 1 1 1 1 R01 12G 220 R01 12G 105 R01 13G 115 R01 13G 114 R01 005 103 R01 12G 103 17 37 34 35 36 27 28 31 25 26 24 23 30 29 33 32 16 10 8 7 11 9 12 13 6 4 2 22 14 19 18 21 15 3 1 5 20 ELECTRICAL PARTS PK 2 5FLD PK 3FLD PK 2 5FLD1 PK 3FLD...

Page 39: ...R REMOTE CONTROLLER DOOR BG02L462H02 BG25A543H07 BG00R259G07 BG25J821H01 BG25H301H02 BG25B573H05 BG02A648G02 BG02J608H07 MV I B F1 2 I B TB2 TB4 C T RT1 RT2 W R W R 250V 6 3A 3P L N 2P 1 2 2 0 440V 1 1 1 1 1 1 20 3 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 20 3 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 Q ty set PK 2 5 PK 3 FLD1 1 1 1 1 1 1 20 3 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 FLD 1...

Page 40: ...OW FAN LEFT LINEFLOW FAN SLEEVE BEARING SLEEVE BEARING BG02H065H01 BG02H178H01 BG02A534H17 MF FLSD2 FLSD1 FLSD 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 T7W 571 762 R01 16G 105 R01 17G 115 R01 17G 114 R01 005 103 R01 12G 103 17 37 34 35 36 27 28 31 25 26 24 23 30 29 33 32 16 10 8 7 11 9 12 13 6 4 2 22 14 19 18 21 15 3 1 5 20 PK 4FLSD 2 PK 4FLSD PK 4FLSD 1 ELECTRICAL PARTS PK 4FLSD PK 4...

Page 41: ...OLLER BATTERY COVER REMOTE CONTROLLER HOLDER REMOTE CONTROLLER HOLDER REMOTE CONTROLLER DOOR REMOTE CONTROLLER DOOR BG02L462H02 BG25A543H07 BG00R259G07 BG25J821H01 BG25H301H02 BG25B573H05 BG02A648G02 BG02J608H07 MV I B F1 2 I B TB2 TB4 C T RT1 RT2 W R W R 250V 6 3A 3P L N 2P 1 2 3 0 440V 1 1 1 1 1 1 26 4 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 26 4 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1...

Page 42: ...nections for the indoor and outdoor units are made open the stop valve on the outdoor unit to allow refrigerant gas to flow If piping length exceeds 20m an additional charge of refrigerant is needed Note 2 The following main parts are contained in the optional refrigerant piping kit Heat insulating cover vinyl tapes nipples sleeve and flange for wall hole 1 REFRIGERANT PIPES Service Ref PK 2 5FLD ...

Page 43: ... is invalidated Operation is controlled by the centralized remote con troller only Initial setting is DUAL LCD Matrix Display This display indicates the operational sta tus of all connected units either by steady lighting or by flashing POWER ON OFF switch Operation ON OFF switch BACK AHEAD buttons These buttons are used to designate the attached unit s They designate the unit to be centrally cont...

Page 44: ...ENGAGED GROUP ACTIVE BYPASS GROUP SELECTION PROGRAM TIMER CONTROLLER OPERATION DUAL CENTRAL 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 Dip switch SW17 Centralized remote controller Power supply board 4 3 Connection method 1 Connections in the power supply cord 1 Connect the power supply cord to the power supply terminal block and fix it in place with a tie wrap Connect a sin gle phase 200V AC 220 2...

Page 45: ...Y N E POWER SUPPLY CORD Fuse 5A Tie wrap Wiring has to be changed when 200V power supply is used Tie wrap Transmission cord TRANSFORMER TERMINAL BLOCK FOR POWER SUPPLY TERMINAL BLOCK FOR TRANSMISSION SW1 CN22 CN1 CN21 CN51 CN30CN42 CN50 CN40 AG TRANS 220 240 1 Connections in the adapter box 1 Connect the power supply cord to the terminal block and fix it in place with a tie wrap Connect a single p...

Page 46: ...ll sequential starts all units are triggered collectively by one single ON instruction must be set with different address numbers greater than O for each adapter 10 9 8 7 6 5 4 3 2 1 ON Ex 1 3 2 1 Toggle Address No 6ON 32 No 5ON 16 No 4ON 8 No 3ON 4 No 2ON 2 No 1ON 1 Levers No 1 6 can set the following address respectively with binary notations 3 Connection from adaptor 10 9 8 7 6 5 4 3 2 1 ON Ex ...

Page 47: ...24 hour system 8 00 23 00 Cooling operation with set temperature at 26 C 23 00 8 00 Setback operation with 2 degrees of setback As shown in the chart on the night the set temperature rises 2 degrees automatically during the setback operation When the setback operation ends normal operation will begin 3 Weekly timer function Daily timer function can apply to each day of the week 28 C 26 C 8 00 Norm...

Page 48: ...ances 1 minute in a 0 5 sec ond interval When the lower digit of minute becomes 0 the indication advances in 10 minutes unit BACK button is used for reversing the time Each time the button is pressed the time reverses by 1 minute Pressing continu ously reverses the time by 1 minute in a 0 5 second interval When the lower digit of minute becomes 0 the indication reverses in 10 minutes unit Weekday ...

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