WILMS KT 520 User manual

Manual
Dehumidifier
KT 520
Perfection on principle

EC – Declaration of Conformity
in sense of EC machine directive 2006 42 EEC
Type of machine:
KT 520
is designed, constructed and manufactured in accordance with the above-mentioned
directive, the directive for low tension 2014 35 EEC and EMV directive 2014 30 EEC.
Rohs directive EEC 2011 65 and WEEE directive EEC 2012 19.
The following harmonized standards have been used:
- EN 60335-2-40 Standard for electrical dehumidifiers
- EN 60335-1 Directive of electrical a liances for use at home or similar ur oses
- EN 6100-3-2 Electromagnetic Com atibility
- EN 6100-3-3 Electromagnetic Com atibility
- EN 55014-1 Electromagnetic Com atibility
- CISPR 14-1 Electromagnetic Com atibility
- EN 55014-2 Electromagnetic Com atibility
- CISPR 14-2 Electromagnetic Com atibility
Mönchengladbach,
22.01.2021
Managing Director
________________ __________________ ______________________
Place, Date Signature

CONTENTS PAGE
1. GENERAL SAFETY INFORMATION...........................................................................................................1-2
2. APPLIANCE RELEVANT SAFETY INFORMATION.......................................................................................2
3. GENERAL ADVICE.........................................................................................................................................3
4. DEHUMIDIFIER PRINCIPLES........................................................................................................................3
5. INSTALLATION AND TRANSPORTATION....................................................................................................3
6. OPERATING INSTRUCTIONS.......................................................................................................................4
7. ELECTRONIC CONTROLS............................................................................................................................4
8. AUTOMATIC DEFROSTING SYSTEM...........................................................................................................5
9. WORKING MODE WITH DIRECT DRAINAGE...... ........................................................................................5
10. CONDENSATES PUMP WORKING MODE (OPTION)..............................................................................5-6
11. ELECTRICAL CONNECTIONS......................................................................................................................6
12. OPERATING CONDITIONS...........................................................................................................................6
13. SPECIFICATIONS.........................................................................................................................................6
14. TROUBLESHOOTING...................................................................................................................................7
15. MAINTENANCE.............................................................................................................................................8
16. ELECTRIC DIAGRAMS.................................................................................................................................8
17. DISPOSAL.....................................................................................................................................................9
18. SPARE-PARTS LIST....................................................................................................................................10
19. DRAWING KT 520........................................................................................................................................11

1. GENERAL SAFETY INFORMATION
The o erator must rovide the user with the o erating instructions and ensure that the user understands
the contents.
-The a liance contains a flammable refrigerant.
Read the su lied instructions / warnings
WARNING
Risk of fire flammable
materials
-Read the o erators manual.
-Read the service manual.
-Do not use means to accelerate the defrosting rocess or to clean, other than those recommended by
the manufacturer.
-The a liance shall be stored in a room without continuously o erating ignition sources (for exam le:
o en flames, an o erating gas a liance or an o erating electric heater).
-Do not damage or a ly an o en flame.
-Be aware that the refrigerants may not contain an odour.
-A liance should be installed, o erated and stored in a room with a floor area larger than 4 m².
WARNINGS
This a liance can be used by children aged from 8 years and above and ersons with
reduced hysical, sensory or mental ca abilities or lack of ex erience and knowledge if
they have been given su ervision or instruction concerning use of the a liance in a safe
way and understand the hazards involved. Children shall not lay with the a liance.
Cleaning and user maintenance shall not be made by children without su ervision.
-Com liance with national gas regulations shall be observed.
-R290 (Class A3, acc. ISO 817) has a low GWP (Global Warming Potential) of 3 and an ODP (Ozone
De letion Potential) of 0.
-The maximum refrigerant charge amount is 0,150 kg.
-Kee ventilation o enings clear of obstruction.
-The a liance shall be stored so as to revent mechanical damage from occurring.
-The a liance must be laced at least 50 cm from a wall or other objects.
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-The a liance shall be stored in a well-ventilated area where the room size corres onds to the room area as
s ecified for o eration.
-Any erson who is involved with working on or breaking into a refrigerant circuit should hold a current valid
certificate from an industry-accredited assessment authority, which authorizes their com etence to handle
refrigerants safely in accordance with industry's recognized assessment s ecification.
-Servicing shall only be erformed as recommended by the equi ment manufacturer. Maintenance and
re air requiring the assistance of other skilled ersonnel shall be carried out under the su ervision of the
erson com etent in the use of flammable refrigerants.
2. APPLIANCE RELEVANT SAFETY INFORMATION
ATTENTION
This dehumidifier must not be used in rooms under the following
conditions:
- potentially explosive atmosphere
- aggressive atmospheres
- featuring a high concentration of solvents
- an extremly high ratio of dust
Keep unit grounded: Always o erate the unit with a grounding lug and a grounded electrical outlet.
A grounding lug is an essential safety feature that hel s reduce the risk of shock or fire.
Protect power cord from damage: Never o erate a unit with a damaged ower cord, as this may lead to
electrical or fire hazards. If the ower su ly cord is damaged, it must be re laced by a cord of the same ty e
and am erage rating.
Extension cords: Extension cords must be grounded and able to deliver the a ro riate voltage to the unit.
Handle with care: Do not dro , throw or crash the dehumidifier. Rough treatment can damage the
com onents or wiring and create a hazardous condition.
Run on stable surface: Always o erate the unit on a stable, level surface, for exam le the floor or a strong
counter, so that the dehumidifier cannot fall and cause injury.
Keep out of water: Never o erate the unit in ooled or standing water, as this may create a risk of injury from
electrical shock. Do not store or o erate outdoors. If electrical wiring or com onents become wet, thoroughly
dry them before using the unit. If in doubt do not use the dehumidifier and consult a qualified technician or a
vendors a roved engineer.
Keep air intakes clear: Do not clog or block the air intakes by lacing the dehumidifier too close to curtains,
walls or anything that will restrict the air inlet. This may cause the unit to overheat and result in a fire or
electrical hazard.
Keep filter clean: Always use a clean air filter. Do not allow any material to clog the filter, as this may cause
the dehumidifier to overheat. Never use without a filter. Always check, and if necessary, clean the filter before
switching the dehumidifier on. Do not allow oil, grease, or other contaminants to be drawn into the dehumidifier.
Keep electrical components dry: Never allow water inside the dehumidifier's electrical com onents. If these
areas become wet for any reason, thoroughly dry them before using the dehumidifier. If in doubt do not use the
dehumidifier and consult a qualified technician or a vendors a roved engineer.
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3. GENERAL ADVICE
Before utting your dehumidifier into o eration for the first time, the instructions manual should be studied
carefully.
After receiving the unit you should check your dehumidifier for any trans ort damage. In case of damage,
you should inform the sender immediately.
Transport damages should be stated after un acking the equi ment. The res ective seller or s ecialised
reseller should be contacted immediately.
Keep the packaging for the dehumidifier in a safe lace in order to be able to des atch the dehumidifier safely
if it requires a service. In order to save s ace, you can sim ly cut through the adhesive ta e using a knife and
fold u the cardboard box.
4. DEHUMIDIFIERS PRINCIPLES
This dehumidifier is designed to reduce humidity from the air in a building or art of a building. The ur ose is
to revent humidity damage, and to dry out wet materials such as car et, floors, walls, furniture, contents,
timber and structural materials.
This dehumidifier can revent the formation of condensation, reduce air humidity and kee constant a desired
relative humidity value. The time necessary for the dehumidifier to dry a room and reach the desired relative
humidity de ends on the environmental conditions revailing within the room. For exam le the number of air
changes with outside, any sources of moisture and the room tem erature can all either s eed u or slow down
the dehumidification rocess.
The dehumidifier functions according to the condensation rinci le with heat recovery. The fan takes the humid
air from the room in and across a filter and then through an eva orator. Here the air is cooled below dew oint
so that the water va our of the air forms a condensate on the coils which flows into the water collecting tank.
The cooled and dried air is heated again by a condenser. By recycling the room air through the dehumidifier
over and over again the moisture content and relative humidity of the air is reduced.
5. INSTALLATION AND TRANSPORTATION
For installation and trans ortation, the following instructions must be considered:
The air inlet and the air outlet must not be covered whilst the dehumidifier is in o eration.
Before any moving the dehumidifier it must be switched off by its ON-OFF switch. The mains lug is to
be removed from the socket and the water tank should be em tied.
For trans ortation the dehumidifier should be secured on a level base only and must be revented from
rolling around.
The dehumidifier must always be trans orted vertically.
This dehumidifier must be used exclusively for air dry.
If the dehumidifier has been in a horizontal osition for any time over a few minutes, you must let it
stand in the u right osition for at least 30 minutes before o erating. This allows the oil to drain back
into the com ressor.
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6. OPERATING INSTRUCTIONS
ATTENTION
- Operate the dehumidifier only in the upright position.
- Plug into a standard outlet with the correct voltage and amperage for the unit.
- If the dehumidifier turns off for any reason, wait five minutes before turning it on
again. This prevents the compressor from being damaged.
- Check dehumidifier daily for correct operation.
- Protect floor surfaces from water.
Please proceed as follows to start using this dehumidifier:
After trans orted, the dehumidifier should stand in the u right osition for 30 minutes.
This is recommended to extend the com ressor's o erating lifetime.
Plug in the dehumidifier into the mains.
Check that the water tank is in correct osition.
The control anel must be illuminated after the device has been connected to the ower su ly.
Set the humidity to the desired value.
Check the ro er o eration of the fan and com ressor before leaving the device unattended.
7. ELECTRONIC CONTROLS
This unit is equi ed with an electronic control board. The meaning of each led and corres ondent symbol on
the control anel is the following:
1 - LED lights u when the dehumidifier is connected 7 - Setting for " ermanent o eration" mode
to the mains
8 - Setting to dehumidify very dry
2 - LED lights u when the set oint is reached
9 - Setting to dehumidify cellar dry
3 - LED lights u during defrosting rocess
10 - Setting to dehumidify room surveillance
4 - LED flashes slowly when the water tank is full,
flashes quickly if there is a defect 11 - Setting for "standby" o erating mode
5 - LED bar shows the selected mode by
ressing the buttons "6"
6 - Press the buttons to set the desired o erating
mode.
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8. AUTOMATIC DEFROSTING SYSTEM
During normal dehumidifying o eration, ice may form on the eva orator. This dehumidifier is equi ed with an
automatic hot-gas defrosting system and if ice is detected by the tem erature sensor, it will defrost
automatically according to the following rinci le:
A tem eratur sensor measures the condition existing in the critical area of the eva orator;
It transmits an electrical signal to the main electric board. It has been designed to avoid frequent defrost
cycles and consequent loss of efficiency;
The relay switches off the fan and simultaneously o ens the solenoid valve;
Hot gas is guided into the eva orator until the latter is com letely free of ice;
Subsequently, the dehumidifier will o erate again in its normal mode when the tem erature sensor
measures +7°C;
The time between defrost cycles is 20 min. after.
9. WORKING MODE WITH DIRECT DRAINAGE
This dehumidifier is equi ed with water collecting tank which is rovided ex works with a thread lug for
draining the condensate. In addition, a hose connection is included in the sco e of su ly for a 14-mm hose
(9/16") with which the user can lead the condensate directly into a drain.
During normal o eration, the device collects water in the water tank and sto s o erating when the float reaches
the maximum water level. The corres onding LED on the control anel also lights u (see section 7).
To use the hose for draining the condensate, you should roceed as follows:
Em ty the water tank;
Remove the lug from the bottom of the water tank;
Fasten the 9/16" (14 mm) fitting in the bottom of the water tank;
Attach the hose su lied with the dehumidifier to the 9/16" (14 mm) fitting;
The end of the hose must always be at a lower level than the to of the water tank and headed to a
larger vessel or directly to a drain. The hose must be headed downwards as it uses gravity to drain.
10. CONDENSATES PUMP WORKING MODE (OPTION)
Switch off the dehumidifier and disconnect the mains lug from the socket;
Remove the water bucket from the dehumidifier and em ty it;
Fit in an 8-mm-hose (inner diameter) with the desired length onto the water outlet of the submersible
um and make it ass through the hole in the left side anel and then install the um inside the
bucket;
Plug in the um to the um socket located beneath the water an in the right and return the bucket to
its designated lace;
Extend the hose to an existing drain oint or sewer;
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Plug in the dehumidifier and set the desired humidity level;
Test if the um is working and is draining out water by adding water to the bucket until you check that
the water is being um ed out from the bucket.
11. ELECTRICAL CONNECTIONS
This dehumidifier was designed to o erate in a 230 V ~ 50Hz electrical installation. Make sure that the electric
sockets are connected to earth and that all safety recautions are taken.
12. OPERATING CONDITIONS
This dehumidifier can be o erated within an ambient tem erature range from +5°C to +32°C and with a relative
humidity from 35 % to 90 %. It is suitable for a lication on construction sites, residential buildings, museums,
archives, garages and storage rooms.
13. SPECIFICATIONS
Model KT 520
Temperature range +5 °C - +32°C
Relative humidity range 40% - 90%
Defrosting system Hot gas
Rated voltage 220 - 240 V ~ 50 Hz
Power consumption 32°C – 80% 0,57 kW
Rated current 2,5 A
Air volume 520 m³/h
Contents water tank 5 ltr.
Refrigerant charge R290 / 150 g
Global warming potential (GWP) 3
Equivalent tons of CO2 0,00045t
Maximum permitted pressure 3,0 MPa
Hermetically sealed systems, filled with a flammable refrigerant
Drying capacity
(ltr. 24h)
32°C – 80% 25
20°C – 60% 12
10°C – 60% 5
Dehumidifier dimensions
W×D×H [mm] 330 x 355 x 570
Weight 25 kg
Electronic control 
Noise level 52 dB(A)
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14. TROUBLESHOOTING
Trouble Cause Solution
Unit does not
operate
No ower to the unit Plug in the unit; check ower at outlet
Com letely filled water tank Water tank must be em tied and installed
again
Doesn't dehumidify
Ambient tem erature is lower
than +5°C.
Under this condition the dehumidifier
becomes inefficient. It is recommended to
switch off the dehumidifier
Ambient tem erature exceeds
+32°C.
Under this condition the com ressor is
overloaded and switches off automatically. It
is recommended to switch off the
dehumidifier
The ambient air humidity is lower
than 35%
Under this condition the dehumidifier
becomes inefficient. It is recommended to
switch off the dehumidifier
The air filter is strongly soiled The air filter must be exchanged
Not enough time to dry Allow more time to dry
Compressor will
not start Overload rotector is defective Consult reseller or authorized worksho
The fan is out of
operation Fan not running Consult reseller or authorized worksho
You can see an ice
block on the
evaporator
Defective control assembly Consult reseller or authorized worksho
The room tem erature is lower
than +5°C.
Assure that the device is only set u in rooms
with tem eratures above +5°C
Unit does not
defrost
Defective tem erature sensor Consult reseller or authorized worksho
Defective control assembly Consult reseller or authorized worksho
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15. MAINTENANCE
Always turn off the ower and disconnect the main cable before erforming maintenance rocedures.
All service rocedures below are to be executed with the unit unplugged. Perform before each use or as
needed.
INSPECT ELECTRICAL SYSTEM
Ins ect the electrical cord for damage at regular intervals.
KEEP OUT DUST
Kee dust from surfaces and volumes to dry.
KEEP AIR FILTER CLEAN
Ins ect air filter regularly so that it doesn't get clogged.
Remove the gross of the dust and dirt with a soft brush and then wash it with ta water and let it dry before
inserting it again.
16. ELECTRIC DIAGRAMS
ELECTRICAL WIRING OF THE DEHUMIDIFIER
CONDENSATE PUMP WIRING (OPTIONAL)
In case of using a water condensates um it must be connected to the socket located underneath
the water an of the dehumidifier, and only then it is ossible to switch it on again.
The water um is su lied by the L1 and N wirings.
As the condensates starts to flow into the bucket and the
um s first float is activated, the um starts to um out
the water. If somehow the hose gets clogged the water
level will start to rise until the bucket float with the magnetic moves away
from the level sensor, due to the rising of the water level, making the
dehumidifier to sto by full bucket detection and consequently lighting u
the full bucket led, which will force the user to check the bucket.
OBS.: Pum wiring must be connected according to this electric wiring diagram!
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E- Earthing
N- Common line
L1- Line
EC- Electronic control
EHS- Humidity sensor
NTC- Defrost sensor
S- Water level sensor
M1- Com ressor
M2- Fan motor
Y- Solenoid valve
P- Plug water um
HP- Pressure switch

17. DISPOSAL
In the Euro ean Union electronic equi ment must not be treated as domestic waste. It must be dis osed of
rofessionally, in accordance with Directive 2019/19/EU of the Euro ean Parliament and Council of 4th July
2019 concerning old electrical and electronic equi ment.
At the end of its life lease dis ose this equi ment in an a ro riate manner, according to the relevant legal
requirements.
Check with your local authorities or local store for recycling advice.
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18. S P A R E - P A R T S L I S T KT 520
from serial no. 48436851
Pos. Part-No. Description Qty.
01 3101200 Base late 1
02 3101201 Frame 1
03 3101202 Air outlet grille 1
04 3101203 Air inlet grille 1
05 3101204 Housing 1
06 3101205 Com ressor 1
07 3101206 Heat exchanger com lete 1
08 3101207 Fan motor 1
09 3101208 Fan blade 1
10 3104554 Fan motor bracket 4
11 3101209 Fan resistor 1
12 3104703 Level sensor 1
13/a/b 3101210 Bracket sensor and float 1
14 3104552 Main cable with Schuko lug 1
15 3101211 Cable clam 1
16 3101212 Air filter 1
17 3101213 Water tank com lete 1
18/a/b 3101214 Kit / Plug, gasket, hose fitting 1
21 3101217 Nut 1
22 3101115 Wheel 2
23 3101119 Caster with bracket 2
25 3101219 PCB 1
26/27 3101220 Housing com lete 1
28 3101222 Control anel sticker 1
29 3101223 HR sensor 1
32 3101226 Water an 1
33 3101227 Cable gland 2
34 3101135 Handle 2
35 3104713 Solenoid valve coil 1
36 3104224 Solenoid valve 1
37 3101764 Pressure switch 1
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19. Drawing KT 520
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