Sanyo MDF-U55V Service manual

Service Manual

Ultra-Low Temperature Freezer

FILE No.

MDF-U55V

SANYO Electric Co., Ltd.
Biomedical Business Division

SM9910253

Effective models

This service manual is effective for following model.

Model Product code Voltage and Frequency

MDF-U55V 823 029 54 230/240V 50Hz

Contents

Page

䞉 Specifications

- Structural specifications

- Control specifications

- Performance specifications

䞉 Dimensions

䞉 Refrigeration circuit

䞉 Cooling unit parts

䡡 Components on PCB

䞉 Connection on PCB

䞉 Electric parts

䞉 Specification of sensor

䞉 Wiring diagram

䞉 Circuit diagram

䞉 Control specifications

䞉 Parts layout

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䞉 Test data

- Pull-down & Pull-up data

- Pull-down temperatures

- Pull-down pressure

- Pull-down current-input

- Temperature uniformity (17points measured)

- Amount of power consumption data

- Cycle operation data

- Sample load test

䞉 Instruction manual

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Specifications

Structural specifications

Item Specifications

Name Ultra-Low Temperature Freezer
Model MDF-U55V
External dimensions
Internal dimensions
Effective capacity 519 L
Exterior Painted steel
Interior Painted steel
Outer door 1 door, painted steel
Inner door 2 doors, ABS resin panel with stainless frame

W 770 㽢 D 870 㽢 H 1990 (mm)
W 630 㽢 D 600 㽢 H 1380 (mm)

Insulation

Compressor

Evaporator

Condenser

Refrigerant
Refrigerating oil Ze-NIUSL22SA
Oil additive n-pentane
Oil separator SPK-0S02S2

Shelf

Outer door latch 1pc
Outer door lock 1pc
Caster
Access port
Refrigeration circuit Cascade system
Power supply 230/240V, 50Hz, Single phase
Weight 288 kg

Battery

Accessories 1 set of key, 1 scraper

Optional components

VIP䠄Vacuum insulation panel䠅䠇Rigid polyurethane foamed-in place

High stage side䠖Hermetic rotary type, Output: 450W

Low stage side䠖Hermetic reciprocating type, Output: 750W

High stage side: Cascade condenser

Low stage side: Tube on sheet type

High stage side䠖Fin and tube type

Low stage side䠖Cascade condenser

High stage side䠖R-404A Low stage side䠖R-508

Stainless steel, 3 shelves (adjustable)

Inner dimension䠖W 608 㽢 D 535 (mm) Load䠖50 kg/shelf

4pcs 䠄leveling leg 2pcs. in front side䠅

䃥17mm, 3 locations (back, bottom left, bottom right)

Nickel-metal-hydride battery, 6VDC, 1100mAh,

Auto-rechargeable (5HR-AAC)

Inventory rack (IR-220U, IR-224U), Drawer (MDF-50R),
Temperature recorder (MTR-G85/MTR-85H)
Back-up system (CVK-UB2): LCO
Interface board (MTR-480)
Data acquisition system (MTR-5000)

, (CVK-UBN2): LN2

2

- 1 -

Control specifications

Item Specifications

Temperature controller

Temperature setting range
Temperature display
Temperature sensor

High temperature alarm

Low temperature alarm

Filter alarm FILTER lamp illuminates and buzzer sounds intermittently.

Microcomputer, key-pad input
Non-volatile memory

-50䉝~-90䉝 (Unit: 1䉝)
LED (Unit: 1䉝)
Pt. 1000䃈

When chamber temperature deviates from set temperature+5䉝䡚+20䉝
(Factory default:+10䉝), ALARM lamp blinks and buzzer sounds after 15
minutes of delay.

Remote alarm contact: Normal Open, Normal close
Rated (max) 30VDC, 2A
Turns over after 15minutes of delay

When chamber temperature deviates from set temperature-5䉝䡚-20䉝
(Factory default:-10䉝), ALARM lamp blinks and buzzer sounds after 15
minutes of delay.

Remote alarm contact: Normal Open, Normal close
Rated (max) 30VDC, 2A
Turns over after 15minutes of delay

Door alarm

Power failure alarm

Remote alarm

Notice of battery life

Notice of condensing fan
motor life

STATUS function

Control panel

Key Lock

Self diagnosis function

When a door is open, DOOR lamp illuminates after predetermined delay
time elapses. (Factory default: 2minutes, Range:1~15minutes)

ALARM lamp blinks and buzzer sounds intermittently.
Remote alarm activates.

Allowable contact capacity䠖DC30V 2A䚸N.C.-COM䠈N.O.-COM
When temperature alarm or power failure alarm is occurred or any sensor
is failed, remote alarm contact turns over.
BATTERY lamp illuminates when battery accumulation time (2.8 years)
expires.
BATTERY lamp blinks when condensing fan motor accumulation time
(5.6 years) expires.

zNotice of Battery/condensing fan motor life
zAbnormal power supply voltage
zAbnormal ambient temperature
zOverloaded operation

Alarm lamp: ALARM
Filter check lamp: FILTER
Battery check lamp: BATTERY
Status monitor lamp: STATUS
Door check lamp: DOOR
Buzzer stop key: BUZZER
Alarm test key: ALARM TEST
Status key: STATUS
SET䠖Set key
: Digit shift key

: Numerical value shift key
Press digit shift key for 5 seconds to activate Key Lock mode.

L0: Unlock䚸L1: Lock
When temp. sensor or filter sensor or cascade sensor or AT sensor is

failed;
Error code is displayed, ALARM lamp illuminates, buzzer sounds and
remote alarm is active.

- 2 -

Item Specifications

Compressor protection

Compressor delay time

Performance specifications

Item Specifications

Cascade sensor temperature is higher than 䠉12䉝, L side compressor
turns off.
Cascade sensor temperature is lower than 䠉34䉝, L side compressor
turns on.
Overload relay
When filter sensor temperature is higher than +60䉝, H side compressor
turns off. (Substitution for pressure switch)
Range: 3~15 minutes (Unit: 1minute)
It is not settable delay time individually between H side compressor and L
side compressor.

Maximum cooling performance

Temperature control range

Power source 230V, 50Hz 240V, 50Hz

Rated power consumption 650W 700W

Noise level 47dB <A> (background noise; 20dB)

Maximum pressure 2030 kPa

-86䉝 at the center of the chamber 䠄AT䠖30䉝䚸No load䠅

䠉50䉝 to 䠉86䉝 䠄AT䠖30䉝䚸No load䠅

- 3 -

Dimensions

(Innerdimensionsoftray)

(Innerdimensionsoftray)

Top

exitofpowercord

(Backside)

Front

Side

- 4 -

Refrigeration circuit

Framepipe

Pre-condenser

EXtank

CompressorL

Capillarytube

(EX)

CompressorH

Pre-condenser

Cascadesystem

Condenser

DryerH

Checkvalve

Accumulator

Pre-condenser

Suctionheat

exchanger

CapillarytubeH

Oilseparator

Cascadecondenser

Header

Hside

Lside

- 5 -

DryerH

Evaporator

CapillarytubeL

Cooling unit parts

Parts descriptions

Compressor

Power supply Single phase 230/240V, 50Hz Single phase 230/240V, 50Hz

Refrigeration oil

Cooling system

Condenser (type) Fin and tube type Cascade condenser

Condenser

Pre-condenser

Frame pipe

Evaporator 䠄Type䠅

Accumulator

Capillary tube

Resistance 0.765MPa 0.343MPa 34psi

Length L 2000 mm 2500 mm 500 mm

Outside diameter OD

Inside diameter ID

Refrigerant

Dryer
Condensing fan

Condensing fan motor

Kind䠖Ze-NIUSL22SA

Forced air cooling 䠄Partially䠅,

Pre-condenser (DSH)

P6.35㽢3lines㽢12 columns,

Shell and tube, 䃥80 mm

R-404A Charged q’ty䠖 432g

n-Pentane Charged q'ty䠖 18g

Type: Dry core (D-SM)
䃥230mm, 4pcs. wings

H side L side

Type䠖C-1RN45L5A

Code䠖802 022 15

Charged q’ty䠖230cc

Fin 38pcs.
W250 mm

䃥4.76 mm

Cascade condenser

䃥38 mm

Ex. capillary

䃥2.0 mm 䃥2.0 mm 䃥2.4 mm
䃥0.9 mm 䃥0.9 mm 䃥1.2 mm

Material䠖ABS

Type䠖SV4-11AA5P

Specifications

Forced air cooling 䠄Partially䠅,

R-508 Charged q’ty䠖370g

(TP5R3)

n-Pentane Charged q'ty䠖 53g

Type: 4A-XH-6 Charged q’ty䠖58g

Type䠖KS240J1NS-4A1

Code䠖7FB-0-M101-011-05

Kind䠖Ze-NIUSL22SA

Charged q’ty䠖850cc

Oil cooler (OC)

Coil pipe (䃥6.35mm)

䇷
䇷

Tube on sheet type

䃥9.52 mm

䇷

䇷

- 6 -

Components on PCB



CN3

Remotealarmterminal

#1COM

#2N.O.

#3N.C.

CN5

#1-#5SwitchPCB

#6-#7BuzzerPCB

CN4

#1-#2Temp.controlrelay

#3-#4Heaterrelay

#1-#2

Hcomprelay

CN9

MTR-480(option)

MTR-L03(option)

CN２

DisplayPCB

CN6

#1-#2Doorswitch

#5-#6ATsensor

#7-#8Filtersensor

CN7

#9-#10Cascadesensor

#1-#3

Switchingpowersupply

CN1

CN8

#1-#2Battery,Batteryswitch

#3-#4Powertransformer

- 7 -

CN11

#1-#3

Temp.sensor



Connections on PCB



The following shows the connections of connectors on the Temp. controller PCB.

Connector Connects to Usage

CN1 Switching power supply To supply the power to PCB.

CN2 Communication kit To connect to MTR-480/MTR-L03(option).

Remote alarm terminal

#1: COM.

CN3

#2: N.O.

#3: N.C.

#1-#2㸸Temp. control relay

CN4

#3-#4㸸Heater relay

#1-#5: Switch PCB

CN5

#6-#7: Buzzer

CN6 Display PCB To connect to each LED

#1-#2: Door switch

#5-#6: AT sensor

CN7

#7-#8: Filter sensor

#9-#10: Cascade sensor

#1-#2: Battery㸦#1:6V #2:Battery switch㸧

CN8

#3-#4: Transformer

Remote alarm contact outputs.

In normal condition, open between #1 and #2

and closed between #1 and #3.

To control chamber temperature (12VDC)

To supply the power to Cap. tube heater

(12VDC)

To connect to each switch

To connect to buzzer

To control door open and close

To detect ambient temperature

To detect temperature in condenser outlet pipe.

To detect temperature in cascade.

To supply the power during power failure

To supply the power to PCB.

CN9 #1-#2: H. Comp. relay To control compressor H ON/OFF (12VDC)

CN10 Unused

CN11 #1-#3: Temp. sensor To detect chamber temperature.

- 8 -

)

A

e

)

z

䃈

䃈

)

e

)

z

䃈

䃈

0

V

V

A

Electric Parts

MDF-U55V

Compressor (H

Rated voltage (50/60Hz

Winding resistance C-R(Main) 5.95

C-S(Aux) 14.76

Compressor (L

Rated voltage (50/60Hz

Winding resistance C-R(Main) 2.7

C-S(Aux) 4.9

Starting relay (H)

Pick up voltage 185~217VAC

Drop out voltage 60~120VAC

Starting relay (L)

Pick up voltage 205~235VAC

Drop out voltage 110VAC

Overload relay (L)

Action to the temp. (No current) ON:120䉝 OFF:61䉝

Action to the current (AT25Υ) 20.5A

Operation time 6~16sec.
Starting capacitor (H) Rating 40uF, 300VAC
Starting capacitor (L) Rating 160uF, 250VAC
Running capacitor (H) Rating 15uF, 400VAC
Running capacitor (L) Rating 12uF, 370VAC
Fan motor capacitor Rating
Condensing fan motor

Capitube heater

Resistance (AT25䉝) 4700ȍ

Temp. control relay

Contact capacity 20A 250VAC

Heater relay

Contact capacity 10A 250VAC

H. comp relay

Contact capacity 20A 250VAC

Switching power supply

Battery

Temperature sensor

Cascade sensor

Filter sensor

AT sensor

Battery switch

Breaker switch

Door switch

Transformer

Noise filter

Type C-1RN45L5

Cod

Type KS240J1NS-4A1

Cod

Type AMVL-300A

Type AMVL-300TA

Type MST16AJ120/61-9201

Type SV4-11AA5P
Rating 220-240V, 10W
Rating 11.2W, 230V

Type G4F-11123T

Coil 12VDC

Type G2R-1A-T

Coil 12VDC

Type G4F-11123T

Coil 12VDC
Type ZWS10-12/J
Input

Output 12VDC, 0.85A

Type 5HR-AAC-VIO3

Rating 6VDC 1100mAH

Type THC-663

Rating PT1000ȍ

Type 502AT-1

Rating 5Kȍ(25䉝)

Type 502AT-1

Rating 5Kȍ(25䉝)

Type 502AT-1

Rating 5Kȍ(25䉝)

Type SLE6A2-5

Rating 250VAC, 4A

Model BAM215131

Rating 250V, 15A

Type SDKNA2070

Rating 5VDC, 5mA

Type S41-U097P

Primary 115V, 230

Rating 9VAC, 0.46

Model RSAN-2020

Rating 250VAC, 20A

AC230/240V, 50Hz

802 022 15

220-240V, 50H

7FB-0-M101-011-05

230/240V,50H

100-240VAC

- 9 -

Specifications of sensor

The following shows the temperature in thermal sensor (502AT-1) and its resistance value.

Temp.

(C)

Resistance

(kȐ)

Temp.

(C)

Resistance

(kȐ)

Temp.

(C)

Resistance

(kȐ)

Temp.

(C)

Resistance

(kȐ)

㸫50

㸫49

㸫48

㸫47

㸫46

㸫45

㸫44

㸫43

㸫42

㸫41

㸫40

㸫39

㸫38

㸫37



154.5

145.9

137.8

130.2

123.1

116.5

110.2

104.4

98.87

93.70

88.85

84.18

79.80

75.67

㸫36

㸫35

㸫34

㸫33

㸫32

㸫31

㸫30

㸫29

㸫28

㸫27

㸫26

㸫25

㸫24

㸫23

71.80

68.15

64.71

61.48

58.43

55.55

52.84

50.23

47.77

45.45

43.26

41.19

39.24

37.39

㸫22

㸫21

㸫20

㸫19

㸫18

㸫17

㸫16

㸫15

㸫14

㸫13

㸫12

㸫11

㸫10

㸫5

35.65 0 13.29

33.99 5 10.80

32.43 10 8.84

30.92 15 7.20

29.50 20 6.01

28.14 25 5.00

26.87 30 4.17

25.65 35 3.50

24.51 40 2.96

23.42 45 2.51

22.39 50 2.13

21.41 55 1.82

20.48 60 1.56

16.43 65 1.35



The following shows the temperature in thermal sensor (PT1000ȍ) and its resistance value.

Temp.

(C)

㸫140

㸫130

㸫120

㸫110

㸫100

㸫90

㸫80

Resistance

(Ȑ)

450.83

491.47

531.83

571.92

611.76

651.38

690.78

Temp.

(C)

㸫70

㸫60

㸫50

㸫40

㸫30

㸫20

㸫10

Resistance

(Ȑ)

729.99 0 1000.0

769.02 10 1038.0

807.87 20 1076.0

846.58 30 1113.8

885.13 40 1151.4

923.55 50 1189.0

961.84 60 1226.4

Temp.

(C)

Resistance

(Ȑ)

- 10 -