Haier DW-86L338J User manual

Haier after-sales internal training information, external circulation is strictly prohibited
No.: YL-P3-06-ULT DW-8 Energy-saving Series
Product type: ULT Freezer
Product model: DW-86L338J/388J/578J/626/728J/828J/490J/100J
DW-86W420J/100J
Product illustration:
DW-86L338J/388J DW-86L490J DW-86W420J DW-86W100J
/578J/626/728J/828J
DW-86L100J
Biomedical After-sales Service Manual

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Prepared by:
Reviewed by:
Approved by:
Version: 01 Issue date:

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Revision record
Revision
number
Revision
date
Reviser
Major revision content
01
March 13,
2018
Zheng
Wendong
Addition of content for model DW-86L626, replacement of the
original general compressor of DW-86L626 by hydrocarbon
compressor. Use of hydrocarbon refrigerants with the model and
name unchanged.
02
March 26,
2020
Li Jiangtao
Addition of content for model DW-86L100J.

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Contents
I. Product features and model designation.....................................................................................................................6
1.1 Main functions and features of the product .....................................................................................................6
1.2 Model designation............................................................................................................................................6
II. Product promotion points and selling points.............................................................................................................7
2.2 Safety control:..................................................................................................................................................7
2.3 Refrigerating system:.......................................................................................................................................7
2.4 Humanization design: ......................................................................................................................................7
2.5 VIP...................................................................................................................................................................7
2.6 Temperature monitoring function ....................................................................................................................8
2.7 Noise................................................................................................................................................................8
III. Product appearance and structure characteristics.....................................................................................................8
3.1 New energy-saving structure series: DW-86L578J/626/728J/828J .................................................................8
3.2 Narrow series ...................................................................................................................................................8
3.3 Double-door series: DW-86L490J...................................................................................................................8
3.4 Horizontal freezer series: DW-86W100J Horizontal freezer series: DW-86W420J........................................9
IV. Product component structure name........................................................................................................................10
4.1 Display structure of display board .................................................................................................................10
4.2 Freezer structure ............................................................................................................................................10
4.3 Structure of electric cabinet ...........................................................................................................................15
4.4 System structure.............................................................................................................................................19
V. Product instructions and product improvement.......................................................................................................20
5.1 Unlocking: .....................................................................................................................................................20
5.2 Temperature setting:.......................................................................................................................................20
5.3 Precautions.....................................................................................................................................................20
5.4 Fault code query.............................................................................................................................................21
5.5 Probe resistance changes with temperature (probe type: NTC, which is mainly for ambient temperature
sensor, condensation temperature sensor, and heat exchanger sensor) ................................................................23
IV. Main technical parameters of the product ..............................................................................................................24
6.1 List of technical parameters...........................................................................................................................24
6.2 Product nameplate..........................................................................................................................................27
VII. Case preventive measures, product use and daily maintenance knowledge.........................................................28
7.1 Principle of ultra-low temperature refrigeration:...........................................................................................28
7.2 Method of use of the ULT Freezer.................................................................................................................28
7.3 Working principle of pressure switch ............................................................................................................29
7.4 Characteristics of refrigerant..........................................................................................................................29
7.5 Refrigerant charging procedures:...................................................................................................................29
VIII. System schematic diagram and wiring diagram..................................................................................................32
IX. Specific control, working principle and parameters ..............................................................................................34
9.1 The temperature control system controlled by computer board controls the start and stop of the compressor
.............................................................................................................................................................................34
9.2 Display and alarm ..........................................................................................................................................35
9.3 Special function setting:.................................................................................................................................36
9.4 Battery control requirements: ........................................................................................................................37

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9.5 Adjustment method of temperature drift........................................................................................................37
9.6 Control of condenser fan:...............................................................................................................................38
9.7 Remote alarm function...................................................................................................................................38
9.8 Control of compressor ...................................................................................................................................38
9.9 Voltage calibration .........................................................................................................................................38
9.10 Adjustment of setting value .........................................................................................................................39
9.11 USB data download and time setting ...........................................................................................................39
9.12 Door opening management ..........................................................................................................................40
9.13 Control of balance hole heating wire ...........................................................................................................41
9.14 Control of capillary tube heating wire (Cancel capillary tube heating wire after November 2016) ............41
9.15 Computer board power failure alarm...........................................................................................................41
X. Perspective view and pan view of refrigeration cycle.............................................................................................41
10.1 Refrigeration principle.................................................................................................................................41
10.2 Perspective view and pan view of refrigeration cycle .................................................................................41
XI. Installation and disassembly process .............................................................................................................42
11.1 Installation location:.....................................................................................................................................42
11.2 Product handling and package removal .......................................................................................................42
11.3 Put the product in storage room ...................................................................................................................44
XII. Consultation on typical faults and solutions, and FAQ ........................................................................................44
12.1 Typical faults and solutions..........................................................................................................................44
12.2 Troubleshooting of common problems ........................................................................................................46
XIII. Details of exploded views and spare parts .......................................................... Error! Bookmark not defined.

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I. Product features and model designation
1.1 Main functions and features of the product
1.1.1 The applicable temperature range in the ULT Freezer is -40°C~-86°C;
1.1.2 The design of pressure balance inside and outside the freezer facilitates door open and close; (DW-86L100J
has a small door without balance hole that is easy to open)
1.1.3 The display board is divided into working area and alarm area, which can display the machine startup status,
whether the network is connected, whether the voltage is increased or decreased, and lock display, at the same time,
high and low temperature alarm and freezer temperature can be set;
1.1.4 With a digital display screen it can display the freezer temperature, environment temperature and input voltage
at the same time;
1.1.5 Multiple fault alarms (high and low temperature alarm, sensor alarm, dirty condenser alarm, excessive ambient
temperature alarm, door opening alarm, low battery power alarm, power failure alarm);
1.1.6 Two alarm modes (buzzer alarm, flashing light alarm), and startup delay protection (startup delay time can be
set in accordance with user requirements);
1.1.7 With network functions and RS-232/485 data interface (optional), it can be connected to the computer, display
the freezer temperature and alarm message via the computer, control the temperature and monitor whether the
equipment is normal by operating the computer; (the standard interface of DW-86L100J is RS485 interface)
1.1.8 With 5 V power supply output function, it is convenient for users to use this power supply to directly
power wireless network module;
1.1.9 With the remote alarm function, the alarm can be connected to other rooms to realize alarm function;
1.1.10 The serial products with "J" as suffix in model description are equipped with USB data storage module as
standard configuration, which can save data, including the setting temperature and actual temperature of low and
high temperature in the freezer, ambient temperature and voltage, for more than 10 years. (USB module is optional
for model DW-86L626)
1.1.11 The product is equipped with two 25.5 mm test holes as standard configuration; (one 25.5 mm test hole for
model DW-86L100J)
1.1.12 Equipped with casters, it is flexible, movable, lockable and supportable, and can realize micro adjustment
according to requirements;
1.1.13 Can be configured with recorder, network monitoring system, SMS manager, stainless steel shelf.
1.2 Model designation
DW
-86
L
728
J
Product series suffix
Storage volume of product
Product model with L for vertical type
and W for horizontal type
Characteristic temperature of product

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Initial letters from "Di Wen" means low
temperature
II. Product promotion points and selling points
2.1 Temperature control:
Computer controlled, digital display of temperature with adjustment unit of 1 °C, and the applicable temperature
range is -40°C~- 86°C;
2.2 Safety control:
2.2.1 Multiple fault alarms (high and low temperature alarm, sensor alarm, dirty condenser alarm, excessive ambient
temperature alarm, low battery power alarm, power failure alarm, door opening alarm);
2.2.2 Two alarm modes (buzzer alarm, flashing light alarm), and startup delay protection (startup delay time can be
set in accordance with user requirements);
2.2.3 Safe grounding of all individual components;
2.3 Refrigerating system:
2.3.1 With optimized cascade hydrocarbon refrigeration technology and imported brand compressor, it has
strong refrigeration capacity, and the refrigerant is environment-friendly and fluorine-free, which has no
emission to environmental pollution;
2.3.2 Combination freezer design of high density insulation layer and VIP special insulation material has good
insulation effect;
2.3.3 Independent multi-layer sealing structure and heat insulation system design can effectively eliminate frosting;
2.3.4 The specially designed computer controlled low temperature can avoid the cascade system's general wrong
control to the compressor of the low temperature stage system;
2.4 Humanization design:
2.4.1 LED display screen, which can display the freezer temperature, setting temperature, ambient temperature and
input voltage, set high and low temperature alarm and freezer temperature, and has fault prompt and early warning
function;
2.4.2 Adjustable shelf design for easy access to items;
2.4.3 Safety door lock design with two locks (a padlock and a built-in lock with key) to prevent opening at
will;
2.4.4 Innovative integrated handle design and compact caster enable the freezer to be more flexible and convenient;
2.4.5 It has network alarm and remote alarm functions, which are advanced and practical;
2.4.6 The unique 5 V power supply module solves the user's trouble of connecting a power supply separately
and directly outputs 5 V power from the whole machine;
2.5 VIP
PU foam layer + VIP vacuum insulation material is used to minimize the floor area of the equipment at the same

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time;
2.6 Temperature monitoring function
2.6.1 The alarm message on the device can be sent to registered mobile phone users in the form of SMS;
2.6.2 Users can send short messages to the device to query the real-time temperature and alarms;
2.6.3 The actual operating temperature in the freezer can be downloaded through USB data storage module;
2.7 Noise
It is world leading with lower noise, and it can keep a comfortable working environment, which will not make the
users fidgety.
III. Product appearance and structure characteristics
3.1 New energy-saving structure series: DW-86L578J/626/728J/828J
3.2 Narrow series
3.3 Double-door series: DW-86L490J
Front view
Internal structure
Rear view
Front view
Internal structure
Rear view

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3.4 Horizontal freezer series: DW-86W100J Horizontal freezer series: DW-86W420J
3.5 Vertical under table series: DW-86L100J
Rear view
Front view
Internal structure
Front view
Front view

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IV. Product component structure name
4.1 Display structure of display board
DW-86L100J display board
4.2 Freezer structure
High temperature alarm
The sensor malfunction
Buzzer
Low temperature alarm
Low battery
Lock
Network
Operating
Voltage
stabilization
Back-up
system
Door opening alarm
Power failure
High ambient
temperature
Lock
Dirty condenser
Function
Door opening alarm
Overtemperature alarm
Low battery
Dirty condenser
Operating
Temperature display area

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Inner door: PU foam structure
Inner seal strip of inner door:
Take it out of the fixing groove
during replacement
Outer door: PU foam structure +
VIP
Outer door seal strip: Take it
out of the fixing groove
during replacement
Recorder mounting hole
Outlet-air grid
Inner door handle: Remove the
side screw of the handle during
replacement
Unibody freezer
entrance
Fixing cover of main
sensor in freezer
Fixing clip of
stainless steel shelf:
Take it out directly
during replacement
Trim of freezer
cross beam
Electric zinc steel plate
liner with color coat
Back threading hole
Test hole 2
Test hole 1
5V power
supply
output port
Right guard shield of
machine compartment
Left guard shield of
machine compartment
Power switch cover

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Structure of model DW-86L100J
Outer door handle
Balance hole
Foam inner door
Inner door seal strip
Magnetism switch box for door
opening alarm
Outer door seal strip
Inner door handle of J
series
Freezer back threading hole, which is a four-
channel structure
Inner door handle of model DW-86L626

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Microcomputer controlled
with LED digital display of
temperature in the freezer, with
voltage and ambient temperature,
alarm indication, and compressor
operation status displayed, with
USB equipped as standard
configuration for storage of 15-
year operation data
Stainless steel inner
door
Clapboard
Inner door handle
USB
Door magnet
Outer door: 70 mm
foam layer + 25 mm
aviation vacuum VIP
Outer door handle:
Ergonomic handle design
saves time and effort in
opening and closing the
door
Lock nose
Caster + feet
Four-layer silicone seal for outer
door
Door opening
magnetic control
Shelf bar
Freezer
entrance
Outer door
handle, padlock
Outer door
handle, built-in
lock

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Main sensor housing
Main sensor
5 V cold chain
and IoT interface
Test hole
Hinge
Caster and feet

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4.3 Structure of electric cabinet
Master control
board
Battery
High temperature relay
Terminal block
Electric
cabinet
Filter
R232/485 serial port
module port (optional)
Battery switch
Remote alarm wiring
Power switch
Condenser fan
Low temperature relay
Computer board test button: Press the test
button to see if all relay lights light
continuous and circularly, if not, check if the
relay that is not on has a fault.
Temperature
adjustment
screw
Signal cable
connection
of display
board
USB
signal
cable
connection
Voltage adjustment screw
Door opening
alarm connection
Connection between
the main sensor and
computer board
Connection
between heat
exchange sensor
and computer
board
Connection
between
condenser sensor
and computer
board
Remote
alarm wiring
Balance hole
heating block
connection
(yellow)
Battery charging
connection
(white)
5 V cold
chain power
supply
connection
High
temperature
compressor
Cryogenic
compressor
Conden
ser fan
Suction
Fan
Pressur
e boost
Pressure
reduction
Capillary
tube heating
wire

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4.3.1 Electric cabinet of model DW-86L100J
Ambient
temperature
sensor connection
232/485 interface
connection
Switch power supply
Battery switch
Main switch
Remote alarm and 485 interface
Master control board
Lead acid battery
Filter
Socket-outlet
Relay
Atmosphere
Micro channel condenser
Condenser fan × 2
Condenser sensor fault
Compressor

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Master control board
USB board
USB board
USB drive board
Communicati
on cable
USB communication
cable
Display board cover
Display board shiled
Networking
Tri-color light
Printer
Door switch
Backup system
board
5 V cold
chain
Frequency conversion
signal cable
Networking
Electromagne
tic lock
Battery
Electromagne
tic lock
Display board
Balance hole
Heat exchange sensor
Condenser sensor fault
Ambient temperature
sensor
Main sensor
Thermocouple plate
Remote alarm
Switch power
supply
Load board
Fan, heating wire at the
freezer entrance
Pressure switch
Strong current power
supply

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4.3.2 Installation structure of electric cabinet (DW-86W420J)
Remote alarm and RS485
Main sensor
Battery switch
Battery
Control board
Terminal block
Compressor relay

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4.4 System structure
4.4.1 System structure (DW-86W420J)
Power switch
Battery switch
Remote alarm interface
Backup R232/485 interface
Compressor: from the
back, there is high
temperature stage
system on the left side
and low temperature
stage system on the
right side
High temperature gas-
liquid separator in tube
High temperature filter
Low temperature filter
Anti-dew tube
High temperature
condenser
Condenser fan
Low temperature
oil separator
Low temperature
pressure control
valve

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V. Product instructions and product improvement
5.1 Unlocking:
First press the "Up" or "Down" button, the display screen shows "00", press " " to adjust to "06" ("06" is the
password), and then press and hold the "Function Selection" button for 3 seconds, the lock indicator light is off,
and it is unlocked.
5.2 Temperature setting:
In the unlocking state, press the "Function Selection" button to select "Freezer Temperature Setting", "High
Temperature Alarm Setting" and "Low Temperature Alarm Setting" respectively, after the corresponding
indicator lights are on, press the "Up" or "Down" button to adjust the required temperature.
**Setting method of model DW-86L100J:
After unlocking, when the freezer temperature display area displays TS, press the "Set" button to enter, the
current temperature setting value of freezer is flashing displayed, press the "Up" or "Down" button to modify the
temperature setting value of freezer;
5.3 Precautions
5.3.1 After initial installation or moving of the equipment, please rotate the horizontal support legs clockwise to
support the ground to ensure that the freezer does not move when it is in use. After installation and fixation, it needs
to stand for 24 hours before being powered on.
5.3.2 During use, the room temperature should be kept below 28ºC (if the ambient temperature is higher than 32ºC,
the cooling efficiency will decrease rapidly, and if the ambient temperature is higher than 32 for a long time, the
compressor may be damaged or its service life will be reduced. Therefore, it is recommended to install air
High temperature
compressor
High temperature
filter
condenser
Low temperature
filter
Condenser fan
Oil separator
High temperature gas-liquid
separator
Cryogenic
compressor