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Sanyo MDF-U55V Service Manual
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Sanyo MDF-U55V Service Manual

Ultra-low temperature freezer
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Service Manual
Ultra-Low Temperature Freezer
MDF-U55V
FILE No.
SANYO Electric Co., Ltd.
Biomedical Business Division
SM9910253

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Summary of Contents for Sanyo MDF-U55V

  • Page 1 Service Manual FILE No. Ultra-Low Temperature Freezer MDF-U55V SANYO Electric Co., Ltd. Biomedical Business Division SM9910253...
  • Page 2 Effective models This service manual is effective for following model. Model Product code Voltage and Frequency MDF-U55V 823 029 54 230/240V 50Hz...

  • Page 3: Table Of Contents

    Contents P a g e S p e c i f i c a t i o n s - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - S t r u c t u r a l s p e c i f i c a t i o n s - C o n t r o l s p e c i f i c a t i o n s - P e r f o r m a n c e s p e c i f i c a t i o n s...

  • Page 4: Specifications

    Specifications Structural specifications Item Specifications Name Ultra-Low Temperature Freezer Model MDF-U55V External dimensions W 770 D 870 H 1990 (mm) Internal dimensions W 630 D 600 H 1380 (mm) Effective capacity 519 L Exterior Painted steel Interior Painted steel Outer door...

  • Page 5: Control Specifications

    Control specifications Item Specifications Microcomputer, key-pad input Temperature controller Non-volatile memory Temperature setting range -50 ~-90 (Unit: 1 ) Temperature display LED (Unit: 1 ) Temperature sensor Pt. 1000 When chamber temperature deviates from set temperature+5 (Factory default:+10 ), ALARM lamp blinks and buzzer sounds after 15 minutes of delay.

  • Page 6: Performance Specifications

    Item Specifications Cascade sensor temperature is higher than 12 , L side compressor turns off. Cascade sensor temperature is lower than 34 , L side compressor Compressor protection turns on. Overload relay When filter sensor temperature is higher than +60 , H side compressor turns off.

  • Page 7: Dimensions

    Dimensions (Inner dimensions of tray) exit of power cord (Back side) Front Side - 4 -...

  • Page 8: Refrigeration Circuit

    Refrigeration circuit - 5 -...

  • Page 9: Cooling Unit Parts

    Cooling unit parts Specifications Parts descriptions H side L side Type C-1RN45L5A Type KS240J1NS-4A1 Compressor Code 802 022 15 Code 7FB-0-M101-011-05 Power supply Single phase 230/240V, 50Hz Single phase 230/240V, 50Hz Kind Ze-NIUSL22SA Kind Ze-NIUSL22SA Refrigeration oil Charged q’ty 230cc Charged q’ty 850cc Forced air cooling Partially , Forced air cooling Partially ,...

  • Page 10: Components On Pcb

    Components on PCB - 7 -...

  • Page 11: Connections On Pcb

    Connections on PCB The following shows the connections of connectors on the Temp. controller PCB. Connector Connects to Usage Switching power supply To supply the power to PCB. Communication kit To connect to MTR-480/MTR-L03(option). Remote alarm terminal Remote alarm contact outputs. #1: COM.

  • Page 12: Electric Parts

    Electric Parts MDF-U55V AC230/240V, 50Hz Type C-1RN45L5A Compressor (H) Code 802 022 15 Rated voltage (50/60Hz) 220-240V, 50Hz Winding resistance C-R(Main) 5.95 C-S(Aux) 14.76 Type KS240J1NS-4A1 Compressor (L) Code 7FB-0-M101-011-05 Rated voltage (50/60Hz) 230/240V,50Hz Winding resistance C-R(Main) C-S(Aux) Starting relay (H)

  • Page 13: Specifications Of Sensor

    Specifications of sensor The following shows the temperature in thermal sensor (502AT-1) and its resistance value. Resistance Resistance Resistance Resistance Temp. Temp. Temp. Temp. (k ) (k ) (k ) (k ) 154.5 71.80 35.65 13.29 145.9 68.15 33.99 10.80 137.8 64.71 32.43...

  • Page 14: Wiring Diagram

    Wiring diagram - 11 -...

  • Page 15: Circuit Diagram

    Circuit diagram - 12 -...

  • Page 16: Control Specifications

    Control specifications Key and Switch BUZZER In alarm condition, audible alarm silences when this key is pressed. Remote alarm activates and message is not eliminated. When a power failure is occurred (battery back-up), press this key to show a chamber temperature for 5 seconds. ALARM TEST When this key is pressed, unit steps into Alarm Test mode with ALARM lamp flashes, audible alarm sounds, digital LED is disappeared and remote alarm is...
  • Page 17 Error codes E01: Temp. sensor is open circuited E02: Temp. sensor is short circuited E03: Cascade sensor is open circuited E04: Cascade sensor is short circuited E05: Filter sensor is open circuited E06: Filter sensor is short circuited E07: AT sensor is open circuited E08: AT sensor is short circuited E09: Battery switch is in off position E10: Compressor temperature is abnormal...
  • Page 18 (6)Compressor When a temperature in filter sensor is higher than 60 , E10 and chamber abnormal temperature are displayed alternately and high side compressor is forcibly temperature (E10): turned off to notify compressor temperature is abnormal or fan motor is locked.
  • Page 19 Display sensor F12: 3 digits display of temp. sensor temperature (Unit:0.1 ) temperature: (Ex. -80.2 Displayed as ‘80.2’) F13: 3 digits display of cascade sensor temperature (Unit:1 ) (Ex. 67 Displayed as ‘067’) F14: 3 digits display of filter sensor temperature (Unit:1 ) (Ex.
  • Page 20 (2) Display sequence of STATUS code (Ex.1) When all of three STATUS codes occur simultaneously; ‘ --‘ => ‘-- 1’ => ‘-- 2’ => ‘-- 3’ => ‘--1’ … (Ex.2) When STATUS 1 and 2 occur simultaneously; ‘ --‘ => ‘-- 1’ => ‘-- 2’ => ‘-- 2’...
  • Page 21 Diagnosed running rate =(-(Set temp.)X0.9)+((ATX0.9-4.5 ))-((Set temp.+85 ) / 10)) You can know running status by the calculation for diagnosed running rate. Diagnosis is done by comparing running rate for 8 hours operation after 2 hours elapses since unit started cycle operation, with diagnosed running rate. (Diagnosed running rate –...
  • Page 22 F00: <Purpose> Simply passing through if entered by mistake. <Operation> Press SET key in “F00” display to return to chamber temperature display. F01: <Purpose> Setting of high temperature alarm <Operation> Input F01 and press SET key to display “015” (Factory default). Setting range is ‘005~020’.
  • Page 23 <Operation> Service code should be input in F06 prior to use this mode. Input F17 and press SET key to display ‘00X’. Change a value by pressing key. Press SET key to memorize and return to chamber temperature display. Model code ‘008’: MDF-U55V - 20 -...
  • Page 24 <Initial values in non-volatile memory> Zero Adjustment value for temperature sensor Zero Adjustment value for cascade sensor Capillary heater ON time : 8 minutes Auto Return : 30 minutes Chamber set temperature : -80 Door alarm delay time : 2 minutes High temp.
  • Page 25 F22: <Purpose> Setting of serial communication mode <Operation> input F22 and press SET key to display ‘000’ (Factory default) Change a value by pressing key and key. Press SET key to memorize the value and return to chamber temperature display. Control mode (the 3 digit) 0: Local (initial)
  • Page 26 F28: <Purpose> Display of delay time to start measuring running ratio (2hrs timer; 000~120 min) <Operation> Service code should be input in F06 prior to use this mode. Input F28 and press SET key to display alternately F28 with ‘xxx’ (present count value for delay time to start measuring running rate).
  • Page 27 Compressor control (differential) value Compressor H: Turns on when a chamber temperature is set temperature -0.4 . Compressor L: 1) Turns on when compressor H turns on and a cascade sensor temperature is -34 . 2) Turns on after 3 minutes elapse since compressor H turned on Compressor H, L: Turns off when a chamber temperature is set temperature -1.6 Interval:...
  • Page 28 Delay time Compressor delay time (Factory default: 3 minutes) Compressor H or L will be active after predetermined delay time elapses in case it turned off during cycle operation. Compressor delay time is changeable in F05. Temperature alarm delay time (Factory default: 15 minutes) When high or low temperature alarm is triggered, buzzer and remote alarm are active after predetermined delay time elapses.
  • Page 29 Actions and settings after reset Actions and settings when a power is supplied (Power on reset) Alarm Compressor Remote alarm Ring Back 30 minutes Door alarm delay time 2 minutes Timer Reset 2H, 8H timer Reset (0) Counting time during compressor L is inactive Reset Setting data Read by non-volatile memory...
  • Page 30 Examples of display: Chamber temp. -79.5 Decimal point of chamber temp. -80.0 Set temp. -80.0 Sensor offset -5.0 Operation monitoring Function Error Service code Set value Accumulation time 8H timer 135 Key Lock Buzzer tone: Alarms (except door alarm) Intermittent tone Key operation Click tone Set value memory...

  • Page 31: Parts Layout

    Parts layout Control panel Inner door handle Temp. sensor with cover Door latch "Close" Door latch "Open" Temp. sensor without cover Filter AT sensor - 28 -...
  • Page 32 <Cooling unit - Rear bottom side> <Cooling unit - Left bottom side> Oil separator Oil separator Compressor L Compressor H Condensing fan motor Filter sensor Fan motor condenser 12P terminal Remote alarm terminal Breaker switch Battery switch <Electric Box - Right bottom side> Heater relay Transformer Starting relay L...

  • Page 33: Test Data

    Test data Note) Following data are the reference only. AT30 Pull-down & Pull-up Temperture 230V50Hz Pull-down Pull-up -100 Time[hour] AT35 Pull-down Tempertures H EVA OUT L EVA IN L EVA OUT -100 -120 Time[hour] - 30 -...
  • Page 34 AT35 Pull-down Pressure 1 230V50Hz Time[hour] AT35 Pull-down Current-Input 1000 50Hz 50Hz Time[hour] - 31 -...
  • Page 35 Temperature uniformity - 17points measuring Notes) These data are the reference only. Back Top of interior Upper area measuring points Front (1)~(4): 69mm(H)lower from "Top of interior", 69mm 30mm(D) away and 43mm(W) away from each corner (16) (5): Center and 69mm(H) lower from "Top of interior"...
  • Page 36 Temperature Uniformity (Reference Data) Conditions Ambient temperature: 20/30 Load: Unloaded Temperature distribution Temperature of the cycle in each area (SV=-80 air temperature) Unit: Ambient temperature 20 230V/50Hz Middle of Maximum Minimum Differential cycle Left front -75.7 -81.0 -78.4 ±2.7 Left back -77.7 -84.2 -81.0...
  • Page 37 Temperature distribution Temperature of the cycle in each area (SV=-70 air temperature) Unit: Ambient temperature 20 230V/50Hz Middle of Maximum Minimum Differential cycle Left front -67.6 -74.7 -71.2 ±3.6 Left back -69.3 -78.3 -73.8 ±4.5 Right front -66.0 -73.3 -69.7 ±3.7 Right back -68.4...
  • Page 38 <Temperatures during cycle operation> Condition: SV-80 , AT30 Time[hour] Condition: SV-80 , AT20 Time[hour] - 35 -...
  • Page 39 Condition: SV-70 , AT30 Time[hour] Condition: SV-70 , AT20 Time[hour] - 36 -...
  • Page 40 <Sample load test> Conditions: 500ml water x 180 bottles 90L Measuring points: a, b, c, d, L eva-out, H eva-out Ambient temperature: 30 4th shelf: 500ml x 45bottles Front 3rd shelf: 500ml x 45bottles 2nd shelf: 500ml x 45bottles 1st shelf: 500ml x 45bottles Pull-down data AT:30 Load d...

  • Page 41: T E S T D A T

    Temperature changes (SV-80 SV-70 -80 ) AT30 Temperature[ ] H eva out L eva out Load a Load b Load c Load d Time[min] Pull-up data AT30 H eva out L eva out Load a Load b Load d Load c -100 Time(hr) - 38 -...

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