SAWAFUJI ELECTRIC Engel MT35F-U1 User manual

MODEL (Type without digital display) :
MT35F-U1 0642 032 0R12
MT45F-U1 0642 042 0R22
2020.12
#1
SERVICE MANUAL

●FOR REFRIGERATOR USERS
・Failing to service properly may result in poor reliability of the refrigerator.
・Read this booklet carefully and perform servicing with great care.
・
●FOR SAFETY OF YOURSELF
・
●SAFETY SYMBOLS
・The following warning labels in this booklet indicate precautions for service work.
Comply with what each symbol indicates whenever it appears.
●REFRIGERATOR CODE NUMBERS
・This manual is compatible with described model in below.
Please check refrigerator model name and number in lable .
(Lable place as picture)
NUMBER MODEL NAME
0642 032 0R12 MT35F-U1
0642 042 0R22 MT45F-U1
This service manual describes maintenance procedures for ENGEL refrigerator.
This manual is intended for repair engineers who are familiar with basics service skills and
knowledge for ENGEL refrigerator.
This manual does not guarantee correct maintenance when service is done by a non-skilled
worker without technical knowledge.
Note that the content of this booklet including product specifications is subject to change for
improvement without notice.
Always comply with the procedures, directions, and work tips in this booklet when
servicing the refrigerator.
To secure safe and correct servicing, read this manual thoroughly in advance and check
if there are protective equipment and appropriate tools and service parts ready as well
as technical skills necessary to perform servicing.
May lead to death or serious injury if failed to comply with this
precaution
May lead to injury if failed to comply with this precaution
Lead to failure of the refrigerator set or its components if failed
to comply with this precaution
WORK TIPS

1.
SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
1
■ Specifications Table ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
1
■ Exterior / Interior Dimensions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
2
2.
INSTALLATION A REFRIGERATOR ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
3
■ How to Install the Refrigerator ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
3
■ Temperature Setting ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
3
3.
PART NAME ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
4
■ MT35F / MT45F ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
4
4.
CONNECTING DIAGRAM ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
5
■ Block Diagrams & Wiring Diagrams ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
5
5.
TROUBLE SHOOTING ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
6
■ Does not get Cold ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
6
■ Cooling is Weak ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 
7
■ Refrigerator is too Cold ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 
8
■ Typical Problem ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
9
■ Technical Data ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
9
6.
CHECK POINT ＆ CHECK METHOD ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
10
【Check 1】 Special Fuse & Blade Fuse ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
10
【Check 2】 Output Voltage of the Compressor ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
10
【Check 3】 Check the Resistance at the Coil if Compressor. ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
10
【Check 4】 Resistance of Thermistor ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ .
11
【Check 5】 Resistance of Control Assy ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
11
【Check 6】 Compressor Rated Current ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
11
【Check 7】 Resistance of Thermistor ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
12
7.
REPLACING PARTS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
13
【How to Replace Cooling Unit 】 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
14
【How to Replace Power Supply】 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
15
【How to Replace Fan Motor】 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
16
CONTENTS

■ Specifications Table
STORAGE VOLUME ℓ （liter）
in
mm
in
mm
CABINET
DOOR
CABINET
DOOR
DOOR
CABINET
AC
DC
DC12V
DC24V
LBS.
Kg
※1 We took the largest mesurement ( including latch and handles)
※2 At an ambient temperature of 30℃ with the refrigerator door closed
MODEL
REFRIGERANT
TEMPERATURE CONTROL
NOTCH 5 OR FREEZE ※2
AVERAGE INNER
TEMPERATURE ※2
INPUT VOLTAGE
12/24V
RATED AMPERAGE
1.3A
120V
1
WEIGHT
COMPRESSOR RATING
TEMPERATURE CONTROL
1. SPECIFICATIONS
OUTER
ENCLOSURE
COMPRESSOR MODEL
INTERIOR
DIMENSIONS
W×H×D ※1
2.5A
EXTERIOR
DIMENSIONS
W×H×D ※1
MODEL CODE
HEAT INSULATOR
Painted steel plate
Foamed Polyurethane (Cyclopentane)
INNER ENCLOSURE
A.B.S.Resin
364×408×648
10.6×10.6×15
270×270×380
MT35F-U1
0642 032 0R12
32
14.3×16.1×25.5
46.3
21
MT45F-U1
0642 042 0R22
42
14.3×20×25.5
364×508×648
10.6×14.6×15
24
52.9
270×370×380
Automatic temperature control by dial setting (Electronic
thermostat control type)
−18 ℃ or lower
8℃±3℃
by Thermostat control NOTCH 1
HFC-134a
AC 15V, 1.8A, 27W
SK511P (K3)

※ Tolerance is omitted
Unit (mm)
・MT35F
・MT45F
1. SPECIFICATIONS
2
270
408
648
364
648
364
508
380
270
370
380
270
498 (MD45F-XL Only)

■ How to Install the Refrigerator.
(1) Your shockproof fridge is best installed on a solid surface.
(2) Be sure your fridge is not placed near a gas stove, heater or other
heat-generating appliances.
(3) Adequate ventilation and suitable distance from each wall (at least 150mm or more)
is necessary for the maximum cooling efficiency and minimum electric current consumption for
"free standing use"( see Fig.1 shown below).
(4) Avoid installing your fridge close to kitchen sink or faucet.
(5) If you use the fridge under the counter or in the fixing box, please note the
following air ventilation conditions.
① Make vent opening both under fridge or bottom and above fridge top cover.
■ Temperature Setting
Turn the temperature setting knob to change the air temperature inside the refrigerator.
*
5
3
② Vent opening size must be larger than 160㎠ for each opening ( the more air circulation over the
condenser, the more efficiently fridge will operate).
Inside temperature *
OFF (Stop)
Approx. -18℃
at an ambient temperature of 30℃ with the refrigerator
door closed
2. INSTALLATION A REFRIGERATOR
Temp setting position
0
1
2 - 4
Approx. 5℃
Approx. 0℃ - 12℃
Failure to provide the necessary venting will result in poor refrigeration, continuous compressor
operation, accelerated battery discharge and sometimes shorten the life of fridge.
Top Cover Minimum Opening 160㎠
Wall or Box Case
At least 150mm
From Each Wall
Floor or Box Bottom Minimum Opening 160㎠
WORK TIPS
(Fig 1)

■ MT35F / MT45F
3. PART NAME
4

● Block Diagram
MODEL: MT35F-U1, MT45F-U1
● Wiring Diagram
MODEL: MT35F-U1, MT45F-U1
5
4. CONNECTING DIAGRAM

※１ Ambient temp 25℃ ※２ Ambient temp 25℃～-16℃
5. TROUBLE SHOOTING
6
Power supply output voltage.
Approx. AC13V - 17V ※１
■Does not get Cold
Is compressor
running?
Lower than AC１３Ｖ
Checking
Is special fuse
blown?
Are wirings and couplers
connected?
A
Power supply is broken.
Replace the
power supply.
Replace the fuse
Check the fridge, Go to A
See page 10
【Check 1】
See page 10
【Check 2】
Test result
Judge
Fixing
Connected repair.
Replace the
power supply.
Replace the
cooling unit.
Resistance of the thermistor.
Approx. 2kΩ -10kΩ※２
Thermistor is broken.
∞Ω
Replace the
thermistor.
Power supply output voltage.
Approx. AC13V - 17V ※１
AC 0V
Power supply is
broken.
Replace the
power supply.
Lower than AC１３Ｖ Output
maladjustment.
See page11
【Check 4】
Output
maladjustment
See page 10
【Check 2】
Is temperature
control assembly
lamp lit?
Normal
Repeats fuse blown.
Yes
Yes No No
Yes
Normal
Normal
No
Yes
No
Power supply is broken.
Higher than 2.0A
The compressor is locked, or
contaminated.
Lower than 1.5A Gas is leaking.
Compressor rated current.
Approx. 1.5A - 2.0A
Replace the
cooling unit.
See page 11
【Check 6】

※１ Ambient temp 25℃
5. TROUBLE SHOOTING
7
■Cooling is Weak
Checking
Test result
Judge
Fixing
Battery voltage is lower than 10V
Voltage is too low.Voltage of battery 10V - 13V?
Charge the bettery
Is the machine part ventilated enough?
Make at least 150mm
room between unit and
wall.
YES
NO
Normal
Please keep the ambient
temperature below 30℃.
Ambient temperature is
too high.
Ambient temparature is higher than 30℃
NO
YES
There are too many things in the refrigerator.
Make some room
for cool air.
YES
Power supply output ｖoｌｔａｇｅ.
Approx. AC13V - 17V ※１
Lower than AC１1Ｖ
Replace the power supply.
Output maladjustment
Is the fan motor running?
NO
Fan motor is broken.
Replace the fan motor.
YES
Higher than 2.0A
The compressor is locked, or
contaminated.
Lower than 1.5A Gas is leaking.
Compressor rated current.
Approx. 1.5A - 2.0A
Replace the
cooling system.
Replace the
registor
variable.
0Ω
Registor variable is
shorted.
∞Ω
Resistance at the registor variable.
Approx. 5kΩ-15kΩ
Dial position 5 - OFF
(Resistance value changes in the dial position.)
Registor variable is
broken.
NO
Normal
Normal
See page 10
【Check 2】
See page 11
【Check 6】
See page 11
【Check 5】
Insufficient ventilation.
Cool air does not spread.
See page 12
【Check 7】

※2 Ambient temp 25℃ to -16℃
5. TROUBLE SHOOTING
8
Checking
Test result
Judge
Fixing
Replace the
control assy
.
0Ω
Control assy is shorted.
∞Ω
Resistance at the control
assy.
Approx. 5kΩ-17kΩ
Dial position 5
-OFF
(Resistance value changes in the
dial position.)
Power supply is
broken.
Replace the
power supply.
See page 11
【Check 5】
Resistance of the thermistor.
Approx. 2kΩ -10kΩ ※2
Thermistor is broken.
∞Ω
Replace the
thermistor.
Control assy is broken.
Normal
Normal
■
Refrigerator is too Cold.
(Can not be temperature
adjustment)
See page11
【Check 4】

■ Typical Problem ※１ Ambient temp 25℃
※２ Ambient temp 25℃ to -16℃
Symptoms Cause Test Result Treatment
Resistance of compressor coil is ∞Ω
・Normal: Approx. 1.69Ω(K3) ※１
Output voltage of power supply is AC 0V
・Normal: Approx. AC13 - 17V ※１
Resistance of thermister
・Normal: Approx. 2kΩ- 10kΩ ※２
Replace of cooling unit
Replace fan motor
Charge the bettery
Make some room for cool air
Replace the fuse
Replace the fuse
Check the vehicle
■ Technical Data ※１ Ambient temp 25℃
※２ Ambient temp 25 to -16℃
Checking Points Normal data
Wire thermisiter is open
Replace thermister
* Ambient temparature is higher than 30℃
* Ventilation at mechanical part is not enough
5. TROUBLE SHOOTING
Lamp of control
assy is lit.
Inside of the fridge does not
get cold
Coil of the compressor is open
Replace the cooling unit
Power supply is broken
Replace power supply
Compressor does not work
Make at least 150mm room
between unit and wall
* Too many things are put inside
Lamp of control assy is not lit.
* The special fuse inside DC cord is open
* Fuse in the vehicle is open
* Socket or other DC power line in the vehicle is bad
Cooling is weak
* Gas is leaking from Cooling Unit
Resistance of the compressor
Between incoming cords to compressor
(by detaching from terminal of compressor)
Approx. 1.69Ω(K3) ※1
* Fan motor is broken
* Input voltage is lower than 10V
Checking items
Input voltage at compressor
Between terminals of compressor
Approx. AC 13V - 17V ※１
Resistance of thermistor
Between two pin of the coupler
Approx. 2KΩ - 10KΩ ※２
9
Output voltage of power supply
Between outgoing cords from power supply
(by ditaching from terminal of compressor)
Approx. AC 13V - 17V ※１
Special fuse
Special fuse of DC cord
0Ω

【Check 1】 Special Fuse & Blade Fuse. (Fig.1)
◇ Check the resistance of special fuse by tester.
Test result Judge
0Ω Normal
∞Ω Broken
◇ Check the blade fuse. (G3, G4 Type only)
The blade fuse is in the power supply.
To remove the blade fuse, please remove the power supply.
【Check 2】 Output Voltage of the Power Supply.
(Fig.2)
◇ Checking point
Check at two pin coupler of power supply. (Fig.2)
Test result Judge
Approx. AC13 - 17V Normal
AC 0 V Power Supply is broken
Approx. AC13V or lower Compressor is locked
【Check 3】 Check the Resistance at the Coil if Compressor.（Fig.3)
◇ Checking points
Remove two pin coupler at motor cord, and check.
Test result Judge
Approx. 1.69 Ω Normal
∞Ω Broken
0Ω Coil of compressor is short circuit
6. CHECK POINT ＆CHECK METHOD
10
・Please attach attention to the special fuse of
orientation.
・It can not detect the temperature is in the wrong
special fuse orientation. （※）
Fig.1
Fig.2
DC CORD
Fig.3
POWER SUPPLY
POWER SUPPLY
SPECIAL FUSE
WORK TIPS
BLADE FUSE (10A)

【Check 4】 Resistance of Thermistor. （Fig.4)
◇ Checking points
Remove the two pin couplers from power supply, and test.
Test result Judge
Approx. 2 kΩ - 10 kΩ Normal
∞Ω Broken
0Ω Short Circuit
【Check 5】 Resistance of Control Assy. (Fig.5)
◇ Check point.
Remove six pin coupler.
Test result
Dial position OFF - 5
Approx. 17kΩ - 5kΩ Normal
∞Ω Broken
0Ω Short circuit
【Check 6】 Compressor Rated Current. （Fig.6)
◇Checking point
Test result Judge
Approx. 1.5 - 2.0A Normal
Lower than 1.5A Gas is leaking.
Higher than 2.0A
Compressor is locked, or
contaminated.
Assessment
6. CHECK POINT ＆CHECK METHOD
11
Check the resistance at between terminals brown and
black.
Current value measurement with clamp meter between
input cord terminals.
POWER SUPPLY
CONTROL ASSY
WORK TIPS
・When short circuit, motor runs continuously.
Fig.4
POWER SUPPLY
Fig.5
Fig.6
BROWN
BLACK
To measure the rated current of the compressor,
please measure after 15 minutes or more after
starting the refrigerator.
WORK TIPS

【Check 7】 Resistance of Thermistor. （Fig.7)
◇Checking point
If want to check the start-up of the fan motor directly,
can check by connecting the DC24V directly. (Fig.7)
12
6. CHECK POINT ＆CHECK METHOD
Fig.7
・
Please be careful not to mistake the polarity
of the power supply.
・
When connect with DC24V or wrong polarity,
fan motor will fail.
・Please use such as support coupler so as
not to short-circuit power.

【How to Replace Cooling Unit】
1. Remove the door (Fig.1)
Open the door and take out the basket.
Remove four screws which hold hinges. (Fig.1-①)
2. Remove the motor cover. (Fig.2)
Remove two screws of motor cover. (Fig.2-①)
Remove two screws of case cover assy. (Fig.2-②)
3. Take out the power supply. (Fig.3)
Cut the fastener. (Fig.3-①)
Remove two screws of power supply. (Fig.3-②)
Pull out four couplers. (Fig.3-③)
Pull out coupler. (LED LIGHT; MT35F / 45F-TH, G4-S Only) (Fig.3-④)
Take out the power supply. (Fig.3-⑤)
7. REPLACING PARTS
13
Fig.2
Fig.3
②
①
①
③
DOOR
Fig.1
14mm
14mm
WORK TIPS
When re-installing for door and hinges, please be care with placing position
of hinge height. Position must be 14mm from the cabinet.
(Please see reference picture in below)
After installation of door, please make sure for interior light not leak from
side of door.
If it's possible to see the light, please adjust height of hinges. MOTOR COVER
CASE COVER ASSY
⑤
②
③
①
POWER SUPPLY
GROUND CORD
④

4. Remove the case cover assy. (Fig.4)
Remove seven screws of case cover assy. (Fig.4-①)
Remove case cover assy. (Fig.4－②)
5. Remove three screws of evaporator. (Fig.5-①)
6. Remove the cover pipe. (Fig.6)
Remove two screws of cover pipe. (Fig.6-①)
Remove two fasteners of cover pipe. (Fig.6-②)
Remove the cover pipe. (Fig.6-③)
Remove the rubber bushing. (Fig.6-④)
７. Remove two screws of wire condenser. (Fig.7-①)
Cut the fastener. (Fig.7-②)
7. REPLACING PARTS
14
③
Fig.5
Fig.6
Fig.７
①
②
④
EVAPORATOR
①
COVER PIPE
FASTENER
RUBBER
BUSHING
①
②
Fig.4
①②

8. Remove four screws of compressor. (Fig.9)
9. Pull out cooling unit. (Fig.9)
Take out cooling unit from cabinet assy. (Fig.9-①)
Remove screw of EVA. thermister. (Fig.9-②)
10. Pull out input cord from the compressor. (Fig.10)
Pull out the positive side. (Fig.10-①)
Pull out the negative side. (Fig.10-②)
【How to Replacement of Power Supply】
1. Remove the door.
(【How to Replace Cooling Unit】 STEP.1)
2. Remove the motor cover.
(【How to Replace Cooling Unit】 STEP.2)
3. Take out the power supply.
(【How to Replace Cooling Unit】 STEP.3)
4. Remove four screws of power supply. (Fig.11-①)
5. Remove ground cord of power supply. (Fig.11-②)
7. REPLACING PARTS
15
Fig.9
①
②
Fig.10
①
②
COOLING UNIT
EVA. THERMISTER
COMPRESSOR
①
Fig.11
①
②
POWER SUPPLY
GROUND CORD
Fig.8
①
①

【How to Replacement of Fan Motor】
1. Remove the door.
(【How to Replace Cooling Unit】 STEP.1)
2. Remove the motor cover.
(【How to Replace Cooling Unit】 STEP.2)
3. Remove the case cover assy.
(【How to Replace Cooling Unit】 STEP.4)
4. Pull out the coupler. (Fig.12-①)
5. Cut fastener. (Fig.12-②)
6. Remove two screws. (Fig.12-③)
7. Remove four screws. (Fig.12-④)
7. REPLACING PARTS
16
Fig.12
Fig.13
①
FAN MOTOR
②
③
④