Dorosin CD-090 User manual

Instruction Manual
for
Commercial & Industrial Dehumidifier
----------------------------------------------------
Thanks for choosing Dorosin and we highly recommend you to have a careful reading of
the instructions before using the devices. It will provide you with necessary information
for proper use and maintenance.
Pictures inside are for reference only, details shall be in accordant with final product.

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Contents
Chapter 1 Operation Safety...................................................................................... 3
1.1 Safety and Warning.................................................................................................................. 3
1.2 Appliance Range of the Machine........................................................................................... 4
1.3 Contents of the Manual……………………………………………………………...……….4
Chapter 2 Installation of Equipment...................................................................... 4
2.1 Brief Introduction.......................................................................................................................4
2.2 Shipping and Storage……………………………………………………………………...4 5
2.3 Inspection…………………………………………………………………………………...…5
2.4 Electrical Connections……………………………………………………………………..5 6
Chapter 3 Operation Control……………………………………………..……….6
3.1 Button Function Instruction……………………………………………………………..……6
3.2 Operating the Machine…………………………………….……………………...….……6 7
Chapter 4 Troubleshooting…………………………………................….…...7 8
Chapter 5 Instruction on Code of Failure………………………………...….....8
Chapter 6. Maintenance……………………………………………..……..9
6.1 Maintenance Introduction…………………………………………………………...….…...9
6.2 Filter Unit………………………………………………………………….....……....………..9
6.3 Electric Motor…………………………………………………………………….……..….....9
6.4 Maintenance Procedures…………………………………………………………….....…...9
Warranty Card…………………………………………………………………..10 11

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Chapter 1. Operation Safety
1.1 Safety and Warning
The dehumidifier meets the safety requirements of Chinese and European standards. The
design and manufacturing have taken the safety of personnel and equipment in into
consideration. In each chapter of this manual, there is information about security, which
clearly points out the dangerous operation, and signs the warning signs in the front.
This manual provides the best operation experience and procedures for dehumidifiers. But
these recommendations serve as guidance and do not take any personal responsibility or
implement local safety regulations. When installing and operating equipment, everyone must
assume the following responsibilities:
• Protect the safety of the equipment according to the description of this manual.
• Keep safety of yourself and others.
• Electrical components must be maintained by authorized electrical installation personnel.
• The equipment is not explosion-proof and is forbidden to be used in inflammable and
explosive places.
• Disconnect the dehumidifier from the main power supply before opening any maintenance
panel.
• When the operation is over, the dehumidifier should be cooled for at least 5 minutes before
being maintained.
• If the dehumidifier is not maintained, the maintenance panel should be closed.
• Dehumidification equipment is limited to do dehumidification of air under atmospheric
pressure.
• It is prohibited to use dehumidifier in case of uninstalled filter. If the filter device is not
installed, the surface air cooler will be contaminated, thereby losing the ability to
dehumidify.
•Deletion or alteration of marks and instructions on dehumidification equipment are
prohibited.
• This manual shall be properly kept.
• Use spare part of the original equipment.
• Dorosin's written permission must be obtained before any modification or adjustment of the
device.

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1.2 Application Range of the Machine
Dorosin series dehumidifier adopts direct evaporation cooling design, which can dry the air
in atmospheric pressure. Dehumidifying equipment can dehumidify air temperature range
between 5-38 ℃with 99% relative humidity. The working principle is that the blower
dehumidify and heat the indoor air or outdoor mixing air through the surface air cooler and
send them into the room, so that the indoor temperature can be lowered to meet the comfort
requirements of people.
The equipment is applicable to the working temperature range of 5-38℃, beyond which will
affect the normal use of the equipment.
1.3 Contents of the Manual
This manual is oriented to the most users of the dehumidifier, including installation, operation,
maintenance and basic failure analysis. Purpose of this manual is providing necessary
information for users to comprehend the structure and function of the equipment and guide
users about installation, operation, maintenance and basic fault analysis before Dorosin
provides services.
Chapter 2．Installation of Equipment
2.1 Brief Introduction
The dehumidifier can be installed in many places which depending on the user's needs. If
there are requirements, it can be used with the existing power system or existing duct
system together. This section covers the description of required job of dehumidification
equipment from leaving the factory to being installed. Read before equipment installation
can help you to arrange work properly.
2.2 Shipping and Storage
In order to ensure the quality and reliability of the dehumidification equipment, every
equipment has been inspected before leaving the factory. If the dehumidification equipment
is to be stored for a period of time before installation, the following items should be noted:
a. It is not suitable to remove the transport packaging.

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b. Placement of equipment can avoid physical damage and hurt.
c. Must be stored under cover to prevent dust, frost and rain from encroaching.
d. The equipment is not allowed to lie down or stand upside down.
2.3 Inspection
Disassemble the packaging of the equipment and inspect the product to ensure that the
equipment is not damaged during transportation. If any damage is found, contact the
equipment supplier. If the piping connected to the dehumidifier is arranged, it should be
checked if the piping arrangement is suitable. If the environment and installation conditions
are not satisfying, please contact the manufacturer's relevant design and technical
personnel.
To ensure optimum dehumidification effect, the fan outlet should be equipped with a diffuser.
2.4 Electrical Connections
NOTICE!
All electrical connections works must be done by local professionals and shall be carried out
by qualified personnel. Dehumidifier control circuit has been marked with different color to
prevent confusion, unit design adopts three-phase ac power supply, electric equipment
installation and configuration are in accordance with the voltage and frequency of equipment
nameplate on the calibration.
The appliance shall be installed according to the national wiring standard.
•The dehumidifier must not operate in a voltage or frequency beyond the manufacturing
range.
•The three-phase ac power supply should be checked before the unit is connected to the
main power supply to ensure that the voltage fluctuation range of the power supply is not
more than ±10% of the voltage and frequency of the equipment. his check is particularly
important for high load situations (which are due to the switching of large electrical
equipment).
•The machine set must be grounded and equipped with a power isolating switch to ensure
that the power is cut off when checking and servicing.

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•The fuse power of the power supply fuse must be consistent with the power and type of the
dehumidifier. The fuse should be installed near the dehumidifier. The selection of power
supply cable and main fuse should be equipped with the correct operation power of the wet
unit. Fuse rated value: 16A 250V
•If the power cord is damaged, in order to avoid danger, it must be replaced by the
manufacturer, its maintenance department or similar department.
•On the power line, L1, L2, L3 are connected with three fire wires on the fixture, and the N is
connected with the zero line, PE and ground are connected. If the display board displays E3,
please switch any two lines of L1, L2 and L3.
Chapter 3. Operation Control
3.1 Button function instruction
1.“Power” button
Press this button to start the machine, it enters start-up mode after the buzzer buzzes twice.
Press this button to stop the machine, it enters stop mode after the buzzer buzzes once.
2. “Set” button
Press this button for once, and it enters the mode of setting required humidity.
3. “+” button
4. Press this button directly to increase the set humidity. Buzzer buzzes once for each
pressing and the set humidity increase by 1% RH. Successive operation can be achieved by
pressing this button successively
5. “-” button
Press this button directly to decrease the set humidity. Buzzer buzzes once for each
pressing and the set humidity decrease by 1%RH. Successively operation can be achieved
by pressing this button successively.
3.2 Operating the machine
1. Energize the power, the dehumidifier will beep for once;
2. Press the “POWER” button for once, the LCD display is light. After all the displays are
normal, the LCD displays current environment humidity;
3. Setting of humidity: press “+” and “-“ buttons to set the required humidity. When the set
humidity is 3% less than current humidity, the dehumidifier works; when the set humidity is
3% more than current humidity, the dehumidifier stops.
4. When the set humidity is less than 10%, the dehumidifier enters the mode of successive
dehumidification.

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Notices!
1. If the set humidity is higher than the actual humidity, the dehumidifier stops working;
2. During dehumidification, after the compressor starts working, the fan and compressor
can only be stopped after working for at least 3 minutes; the compressor can only be
re-started 3 minutes after stops; After about 72 hours of continuous operation, the
compressor will be stopped and resumed 30 minutes later;
3. If works under low temperature, the dehumidifier may judge the system temperature
automatically and defrosts automatically; when defrosting, the indicator of defrosting is
light, the fan works and compressor stops working.
4. The system has auto memory. When all the mode setting has been finished, if there is
sudden power cut during operation, or the power jack slips out, the system may store the
current status before the power is cut and enter the operation before power cut
automatically after power is supplied;
5. Range for humidity is 10%-99%;
6. If the dehumidifier is going to be spared for a long time, please unload the power cord or
cut the power.
7. Auto detection of temperature/humidity failure.
a. When the system detects that temperature sensor exceeds the limited range, the
system enters mode of temperature sensor failure. Under this mode, LCD displays
temperature failure code “E1”, the system works in a circle of dehumidification for 30
minutes and defrosting for 15 minutes;
b. When the system detects that humidity sensor exceeds the limited range, the system
enters mode of humidity sensor failure. Under this mode, LCD displays humidity
failure code“E2”and the system starts continuous dehumidification.
c. After temperature/humidity sensor failure being removed, the system works normally.
Chapter 4. Troubleshooting
Problems
Phenomenon/Reason
Solutions
Dehumidifier does not
work.
1.Could be a power outage.
2. The power switch is not on.
3.Maybe the fuse has blown out.
4.It’s not the definite starting up time.
5.The water tank may be full or not
fixed well，and the light of full water
on screen is flashing.
1.Please wait for power supply.
2. Turn on the power switch.
3.Change the fuse.
4.Wait or cancel the time setting.
5.Pour out water of water tank, then
put it back.

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Unsatisfied
dehumidification effect.
1.The humidity setting is
inappropriate.
2.The front and back of the
dehumidifier may be blocked.
3.Dehumidification time may be not
enough.
4.Door and window may be open.
5.The temperature indoor is lower
than 5℃or higher than 38℃.
1.Set appropriate humidity.
2.Clear the obstructions.
3.Keep waiting.
4.Close door and window.
5.Please use the machine in the
temperature of 5-38℃.
Turn on immediately
after shutdown,
dehumidifier does not
dehumidify.
3 minutes delay protection of
compressor.
The machine will work after 3
minutes.
There is water leak.
1.Drain connection is slack.
2.The drainage system is blocked
3.The water tank is’t placed well.
1.Connect the drain.
2.Clean the stopper.
3.Place the water tank well.
Frost formation.
There id frost on the surface of
dehumidifier.
It’s normal, the machine can defrost
automatically.
The dehumidifier has a
slight wobble.
A slight wobble occurs when turn
on/off dehumidifier.
It’s normal phenomenon.
1. Where the above troubles cannot be fixed and repair is needed, please contact supplier
or distributor. Do not disassemble without authorization.
2. When the dehumidifier is in operation or stops, voice of circulating of refrigerating can
be heard. Such phenomenon is normal.
3. It is normal for the air outlet to drain hot air.
Chapter 5. Instruction on Code of Failure
The dehumidifier is able to automatically judge failure. If there is any failure, there will be
failure code displayed on the humidity display window.
Failure Display
Problem
E1
Temperature sensor failure
E2
Humidity sensor failure
E3
Phase sequence failure
E4
Water tank full
E5
High-pressure protection

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E6
Low-pressure protection
Chapter 6. Maintenance
6.1 Maintenance Introduction
The maintenance and care of dehumidification equipment during the long term use, not
being maintained will reduce the dehumidification performance and even cause failure.
6.2 Filter Unit
The dehumidifier is equipped with an independent filter which is installed in the inlet of the
device. It is prohibited to operate unfiltered device for a long time. It is strictly forbidden to
clog the air inlet and outlet of this equipment, and it is recommended that the filter unit
should be checked and cleaned at least once a month.
6.3 Electric Motor
The service life of the bearing is the same as that of the motor, so no additional maintenance
is required. The motor startup capacitor should be checked every year to ensure its normal
condition.
6.4 Maintenance Procedures
The procedures for inspection and maintenance of routine parts of the unit are listed in the
table.
Components
Check and Maintenance Procedures
1-3 months
12 months
Filter unit
Clean filter unit
Compressor
Check whether the compressor
works normal and the vibration is
normal
Check if there is loose, aging
or damage of the
compressor connection.
Cool&heat
Exchanger
Wash the debris and dirt on the
bottom and surface of the
evaporator and condenser.
Seal
Check if there is damage and
displacement. It should be replaced
if there is wear or damage.
Check if there is damage
and displacement. It should
be replaced if there is wear
or damage.
Temperature and
Humidity Control
Check whether all external
temperature and humidity
probes are properly working.

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Product Warranty Card
Product Name
Item No/Delivery Date
See body nameplate, bar code
Place of origin
Guangzhou
Manufacturer
Guangdong Dorosin Electric Appliance Co.,Ltd
Warranty terms
1. According to the terms of this warranty content, use this product under normal condition
within the warranty period, in the event of failure, you can use this warranty card and
invoice (copy) to enjoy free maintenance services in the service center.
2. During the warranty period, paid maintenance services will be implemented in the
following circumstances:
①Cannot show the effective product warranty card.
②Omission, alteration and no sales company name on warranty card.
③The fault and damage caused by force majeure.
④Failure and damage caused by transportation, loading and unloading.
⑤Failure and damage caused by not operating according to the operation manual.
⑥Failure or damage caused by the removal, repair or modification of the product without the
authorization of the manufacturer.
⑦The failure and damage caused by corrosion gas and dust of the using environment.
3. When the product needs warranty, please send the machine，the warranty card and
purchase invoice (copy）to the designated service center or maintenance
department. The shipping fee shall be borne by the user.
4. Please keep the warranty card properly, there will not be another one if it’s lost.
[Warranty time]
The customer shall enjoy a year warranty service free of charge from the date of
purchase.
Supplier: GuangDong Dorosin Electric Appliance Co.,Ltd
Add.: Room 2018-2019,2nd floor,No.228,Huadi Avenue,Liwan District,
Guangzhou City,Guangdong Province 510000,China
Tel.: [phone]
…………………………………………………………………………………………………………………………………………………………………………………
Product Warranty Return Receipt
Customer Name/Seal
Customer Address
Tell
Item No
Code
Purchase Date
Purchase Way

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Packing list:
1. Dehumidifier *1piece
2. Instruction Manual *1 piece
3. Warranty Card *1 piece
4. Certificate of Qualification *1 piece
Guangdong Dorosin Electric Appliance Co.,Ltd
Add.: Room 2018-2019,2nd floor,No.228,Huadi Avenue,Liwan District,
Guangzhou City, Guangdong Province 510000,China
Website:http://www.dorosin-air.com
Tel.: [phone]