Sanyo MDF-U730 User manual

SANYO
Manual Biomedical freezer SANYO Electric Biomedical CO., Ltd
MDF-U730
FILE NO.
SM9910044

EFFECTIVE MODELS
This service manual is effective following models.
Model Model code Voltage/Hz
MDF-U730 115V
823-178-51
60Hz

Contents
Features:
Specification
Performance specification -
Specification of sensor -
Parts specification
Dimensions
Wiring diagram
Refrigeration circuit principle diagram -
Refrigeration circuit welding points -
Data on cooling capacity -
Instruction manual -
Extract of Instruction Manual -
Precautions For Safe Operation -
Test data -
Trouble shooting
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Features
HFC refrigerant
Refrigerant circuit contains HFC refrigerant that effect to environment little.
Latest cooling system reduces negative factor to global environment. With ambient
temperature shown at 35°C, while temperature inside chamber maintains -35°C.
PCM structure
PCM structure reduces amount of organic solvent.
Internal cooled air forced circulation
Internal cooled air forced circulation by internal fan motor is adopted to ensure the
uniform internal temperature.
Digital display and digital setting
Digital display indicates the internal temperature. Thermister sensor is adopted as
a temperature sensor because it has high stability of accuracy.
Microcomputer controls internal temperature by receiving signal from thermister
sensors.
The unit has various kinds of safety functions, such as high temperature alarm.
Alarm is shown by blinking LED lamp and buzzer sounds.
The unit also has remote alarm contact.
Auto defrosting function
Defrost is performed by special heater installed in cooling unit for a short time.
The unit also has manual defrosting function to be able to defrost at regular timing.

Specification
MDF-U730
Items Specification
Model description Biomedical freezer
Model Number MDF-U730
Outer dimension (Max) W 770 x D 830 x H 1955 mm
Inner dimension
W 650 x D 710 x H 1370 mm
Effective chamber capacity
632 liters. 22.4cu.ft
Cooling performance
-30°C at 1/2 height of the chamber ( AT : 35°C, No load )
Exterior cabinet
Zinc galvanized steel w/powder polyester coating (new bio-gray)
Interior cabinet
Pre-coated steel (white)
Insulation Rigid polyurethane foam Foam: R-141b
Door Zinc galvanized steel w/powder polyester coating (new bio-gray)
Door lock 1 pcs
Compressor Hermetic rotary type ( 300W )
Refrigerant R-404A (HFC refrigerant)
Refrigerator oil E-68NT1 — ME te MA VATANE .
Condenser Skin type a ' ー
Shelf Hard steel wire PE coating. Max load : 50kg/shelf
Accessories 4 pcs (W626mmxD620mm)
Others Key 1 set ,2 large & 2 small nylon clips
Caster 4рсз. (Front & rear movement wheels)
Leveling legs
2 pes in front side.
Access hole
Inner diameter 30mm. 1 places in left side of frame and 1
places on top of the unit.
Option
„Automatic recorder: MTR-G85G, fixture MPR-S7
Automatic recorder: MTR-4014LH, fixture MPR-S30
Power supply
Single phase, local voltage
Weights
150 kg

Items Specification
Internal temp.control range | -20°C — -30°C(AT : 5°C ~ 35°C, RH80%less)
Settable Range Temp. set range : -15°C — -35°C
Temperature sensor Thermistor
Temperature display LED digital display (red colored) by 1°C.
Range : -40°C — 0°C
In case Internal Temp higher/lower than set temp. 10degrees,
High/Low ALARM lamp brinks and buzzer sounds intermittently (about
Temperature 15 min. delay)
Remote alarm contact: turns ON with buzzer sounds
Alarm ALARM lamp brinks, buzzer sounds intermittently, remote
Power failure alarm contact turns ON and display is extinguished.
Remote alarm terminal 3P: contact capacity DC30v, 2A,
Remote N.O. -COM.
(During temperature alarm, power failure alarm, alarm test: ON)
ALARM lamp
BUZZER: Buzzer key
ALARM TEST: Alarm test key
Control panel SET: To switch the SV and PV
»» : To shift the set digit
4 : To change the SV
DEF: Defrost key
Press >> key for five seconds
ME
AE
lm
Lo0:
Unlock
Lo1:
Lock
“When temperature sensor is in fault,
In case sensor shorted, error code E01/HI are displayed.
In case sensor opened, error code E01/LO are displayed.
“When defrost sensor is in fault,
Self diagnosis functi 。
9 Unetion In case sensor shorted, error code E02/ internal temp. are
displayed.
In case sensor opened, error code E02/ internal temp. are
displayed
Power switch Side on rear box
Battery switch Behind on front cover
Power supply Local voltage
Performance specification
115V/60hz
110V/60hz
Cooling capacity -30°C
Temperature control range -20°C ~ 30°C
Motor rated power consumption 300W
Motor rated current 2.9 A
-3-

Specification of sensor
The following show temperature and resistance characteristics on thermistor
sensor for internal temperature control (type : TIS-202PH-037)
and defrosting (type : TIS-202PH-045)
Temperature | Resistance | Temperature] Resistance | Temperatur | Resistance
(°C) (ΚΩ) (°C ) (ΚΩ) е (°С) (ΚΩ)
- 40 59.387 - 25 23.439 - 10 10.216
- 39 55.627 - 24 22.112 -5 7.898
- 38 52.131 - 23 20.869 0 6.160
- 37 48.881 - 22 19.705 5 4.846
- 36 45.856 - 21 18.614 10 3.842
- 35 43.039 - 20 17.590 15 3.070
- 34 40.415 - 19 16.630 20 2.471
- 33 37.970 - 18 15.728 25 2.003
- 32 35.690 -17 14.882 30 1.634
- 31 33.563 - 16 14.087 35 1.342
- 30 31577 -16 13.339 40 1.109
- 29 29.723 - 14 12.636 45 0.921
- 28 27.990 -13 11.975 50
-27 26.371 - 12 11.353
- 26 24.856 - 11 ‚ 10.767

Parts specification
| 115V6ohz
| | |
Compressor : Hermetic rotary type
Main winding : Between C-R S
Aux . winding : Between C-S C
(at 25°C) R
Type 80778022
Output 400W
Resistance (main winding)| 1.820
Resistance (Aux. winding) 5.430
Over load relay
Type P22MUF
Operating 130+10°C
temperature 69+10°C
Closing temperature 5 ~ 15sec
Short time trip
Starting capacitor : To make compressor start easily
Rating 100uF
160VAC
Running capacitor
Rating 20uF
220VAC
Starting relay : To supp ly both winding with the power to start up compressor
Type
AMVL-180A
Operating
voltage
108
~111V
Recovering
voltage
30
~
75V
Cooling fan motor : To circulate internal air
Type FL2-
C011BMPK
Rating 110V,1.5W
Defrost heater : To defrost on cooling unit during defrosting
Resistance 12.40x2
Output 165Wx2
Drain pan heater : To heat the drain pan during defrosting
Resistance 1770
Output 75W

Dimensions
0501
820-1
MU
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Wiring diagram
SON РОВ | e sese
DOOR
SWITCH
POWER
CORD
115V-60Hz
LOAD LINE
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i | | |
| | öğ | | |BLIR
ECTS | | | |
i
CN3
0
Ci
|
| i |
| | SWITCH BATTERY | | | |
| | |
| Mo
| | 1 |
i DRAIN PAN HEATER | | ||
1 "A Am. |
| DEF, HEATER B | | ta?
| MN lolo! 1
| TEMP, FUSE
| DEF, HEATER A | 7 DAY RECORDER
Ri a BN COMP.RELAY |
| | FA MOTOR A |
| © |
| ото в ーーーーーーーー |
|
一
一
一
у
|
|
FA BL
| m |
FA Y SOLENOID VALVE
GE) C COMPRESSOR |
7 3 | STARTING RELAY LA |
v TA "и
|
OVERLOAD
PROTECTOR
>
8
TR
la 全 一
RUNNING CAPACITOR |BL — |
0 FAN MOTOR |
YA
STARTING CAPACITOR |
| В: BLACK R: RED |
BL: BLUE V: VIOLET
GR: GRAY N: WHITE
MDF-U730
CIRCUIT
DIAGRAM
ONE
때

Refrigeration circuit principle diagram
MW
(On unit room left wall)
<
Rotary compressor
Evaporator
NANA
Sub cooler Sub cooler
(On unit room right wall)
Accumulator
Check
valve
Evaporator
Skin condenser Å
(On the cabinet rear)
Capillary tube .
Solenoid valve
Skin condenser
(On the cabinet left side)
Frame pipe
Skin condenser
(On the cabinet right side)
Dry core
X
1

Refrigeration circuit Welding points
Right side cabinet
condenser
(in the cabinet)
Condenser Rear
(in the cabinet)
Accumula
Pre-condenser right
(In the cabinet)
Frame pipe
(In the cabinet ) …
Check valve
Pre-condense:
left
>
Left side cabine
Evaporating pipe
condenser
(Rear of frame) 个 (in the cabinet)
Se
Fap
eg
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EA EB1 EL
Evaporator assy
(in the chamber)

Data on cooling capacity
Temperature('C)
50.0
30.0
30,0
50.0
N
N
The Interal ifemperaturd Of Unit
v
N
OR
Oh lh . 개 개 새
Time scale
-10-
5h

Instruction Manual
m This section is extracted and printed Instruction Manual.
m If you find out " Refer to page ee " in them, that page means not page in
service manual but page in the lower corner of each page in the extract from
user's manual.
That page number is not corresponded with serial number in Service
manual.
-11-

Extract of Instruction manual
PRECAUTIONS FOR SAFTY OPERATION
You must conform to this manual after reading
throughout well, because this manual contains
many important items for safty
Items are described so that you can use this unit safety and
properly, and so that you can take precautions to prevent
possible injury and damage to you and other people.
They are distinguished [WARNING] from [CAUTION]
by its contents. Be sure to observe those contents because
they contain many important items for safety operation.
Indication and meaning are as follows.
[El WARNING
This contents means that it is possible to result
in final injury or serious injury to human beings.
Я [CAUTION
This contents means that it is possible to result
in injury to human beings and damage to thing.
Mark shows ;
ES 回 mark means caution.
O 回 mark means prohibition.
回 Gi mark means an instruction.
Da

< Label on the unit >
This mark is labeled on the cover in which the electrical components
of high voltage are enclosed to prevent the electric shock.
The cover should be removed by a qualified engineer or a service
personnel only.
Be sure t
any time.
o keep this manual in the place accessible by users at any
«19

PRECAUTIONS FOR SAFE OPERATION
/NWARNING
Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to
rain water.
Only qualified engineers or service personnel should install the unit. The installation by
unqualified personnel may cause electric shock or fire.
Be sure to install the unit on a sturdy floor. _ If the floor is not strong enough or the installation site is
not adequate, this may result in injury from the unit falling or tipping over.
Never install the unit in a humid place or a place where it is likely to be splashed by water.
Deterioration of the insulation may result which could cause current leakage or electric shock.
Never insiall the unit in a flammable or volatile location. This may cause explosion or fire.
Never install the unit where acid or corrosive gases are present as current leakage or electric
shock may result due to corrosion.
Make sure a dedicated power source is used as indicated on the rating label attached to the unit.
Make sure to remove dust from the power supply plug before inserting in a power source. A
dusty plug or improper insertion may pose a hazard.
Use a power supply outlet with ground (earth) to prevent electric shock. If the power supply outlet
is not grounded, it will be necessary to install a ground by qualified engineers.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. - Such
grounding may cause electric shock in the case of an incomplete circuit.
Do not insert metal objects such as a pin or a wire into any vent, gap or any outlet for inner air
circulation. This may cause electric shock or injury by accidental contact with moving parts.
Never store volatile or flammable substances in this unit. This may cause explosion or fire.
Never store corrosive substances in this unit. This may lead to damage to the inner components or
electric parts.
If this unit is to be used for storing poisons, radioactive material or other harmful products,
ensure that it is in a safe area. Failure to do so may lead to an adverse effect on the health of
personnel in the area and the local environment. In this case, a request for repair or maintenance will
necessitate a safety check sheet for maintenance personnel.
9.000
0909606000066
0
-14-

PRECAUTIONS FOR SAFE OPERATION
A ©
O
è
©
© ©
人 WARNING
Always disconnect the power supply to the unit prior to any repair or maintenance of the unit in
order to prevent electric shock or injury.
Ensure you do not inhale or consume medication or aerosols from around the unit at the time of
maintenance. These may be harmful to your health.
Never splash water directly onto the unit as this may cause electric shock or short circuit.
Never disassemble, repair, or modify the unit yourself. Any such work carried out by an
unauthorized person may result in fire or injury due to a malfunction.
Disconnect the power supply plug if there is something wrong with the unit. Continued
abnormal operation may cause electric shock or fire.
If the unit is to be stored unused in an unsupervised area for an extended period, ensure that children
do not have access and that doors cannot be closed completely.
The disposal of the unit should be accomplished by appropriate personnel. Always remove
doors to prevent accidents such as suffocation.
Make sure to prepare a safety check sheet when you request any repair or maintenance for the
safety of service personnel.
= B

PRECAUTIONS FOR SAFE OPERATION
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©
4000000086
20900
/\CAUTION
Select a level and sturdy floor for installation. This precaution will prevent the unit from tipping.
Improper installation may result in water spillage or injury from the unit tipping over.
Connect the unit to a power source as indicated on the rating label attached to the unit. Use
of any other voltage or frequency other than that on the rating label may cause fire or electric shock.
Fix the shelves securely. Incomplete installation may cause injury or damage.
When removing the plug from the power supply outlet, grip the power supply plug, not the cord.
Pulling the cord may result in electric shock or fire by short circuit.
Never damage or break the power supply plug or cord. Do not use the supply plug if its cord
is loose. This may cause fire or electric shock.
Do not touch any electrical parts such as the power supply plug or any switches with a wet hand.
This may cause electric shock.
Do not climb onto the unit or do not put articles on the unit. This may cause injury by tipping or
damage to the unit.
Do not store bottle or cans in the freezer. This may cause injury by broken of containers due to
the frozen.
Do not touch any stock (especially metal objects) in the freezer with a wet hand. This may
cause frostbite.
Always hold the handle when closing the door. This will reduce the likelihood of a trapped finger.
Do not lean on the door. This may cause injury if the unit tips over.
Always disconnect the power supply plug before moving the unit. Take care not to damage the
power cord. A damaged cord may cause electric shock or fire.
Dispose of water in the evaporation tray completely prior to the movement. Spilled water or
splashed water may cause current leakage or electric shock.
Be careful not to tip over the unit during movement to prevent damage or injury.
Always disconnect the power plug when the unit is not used for long periods.
Make sure to check the setting value when starting up the operation after the power failure or
power off. Achange of setting value may cause damage to contents.
Do not put the packing plastic bag within reach of children as suffocation may result.
-16-

CAUTIONS FOR USAGE
1. If the unit is unplugged or the power to the unit is interrupted, do not restart the unit for at least 5
minutes. This protects the compressor.
2. This inner cabinet is refrigerated by the forced circulation of cooled air inside the chamber. Ensure
that the intake and exhaust vents are not blocked. Adequate space should be provided between the
items inside the unit to allow air circulation.
3. Never store corrosive materials such as acid or alkali unless the container is completely sealed up.
Corrosion may lead to failure of the unit in time.
4. Once the chamber temperature has stabilized, put the items into the chamber in small batches to
minimize the temperature increase.
5. Fix the shelves securely. Place items on the shelves and leave a space between the walls of the
cabinet and the contents to allow air circulation. Do not place items on the floor of the chamber.
6. Always close the door firmly. The door check lamp is lit when the door is open. The alarm buzzer
sounds two minutes after door opening. The buzzer can be canceled automatically when the door is
closed.
7. Always open and close the door gently. Rough operation may lead fall down of stocked items,
incomplete closing, or damage of door gasket.
8. Do not stock articles beyond the load line. Containers outside the load line disturb the air circulation in
the chamber and cause poor cooling.
9. In the refrigerator compartment, put the items on the shelves and do not contact the items with wall.
10. If an instrument requiring a power source is to be placed inside the cabinet, the cable can be lead
through the access port on the right side and top of the cabinet. After using of the port, a rubber cap
and insulation should be replaced to seal the access port. Failure to do this can affect the temperature
uniformity inside the cabinet and lead to condensation on the outside of the access port.
11. Do not clean the unit with scrubbing brushes, acid, thinner, solvents powdered soap, cleanser or hot
water. These agents can scratch the paint or cause it to peel. Plastic and rubber parts can be easily
damaged by these materials. Especially never use any volatile solvent to clean the plastic or rubber
parts. When a neutral dishwashing detergent is used to clean the unit, wipe it up thoroughly with a cloth
soaked in clean water.
12. If condensation forms on the door or frame surface, wipe it off with a dry soft cloth.
13. The heat discharge pipe is attached inside of the both side & rear frame. The frame sometimes hot
at the start-up of the operation. But this does not mean malfunction.
-17-