Weltem WSC-4000 User manual

WSC-4000 / WSC-6000
WSC-4000 / WSC-6000
Owner’s manual
Features
Typical uses
Specifications
Weltem WSC-4000 / WSC-6000 are designed for a fast installation and
start up. They can be used usefully where access to the outside is
difficult and some distance from internal rooms because outdoor
unit (heat exchanger) can be placed up to 30 meters. They are
economical units which does not need providing of the water
continuously. Quiet in operation enables them to be used in general
offices as well. With their durable metal construction and 4 wheels,
they are very useful for rental. They are space-efficient because they
don’t need to have hot air exhaust duct. A control panel provides ease
of use and contains a self-diagnostic function.
Choice of continuous operation or automatic timer.
1
Computer server rooms, Tents, Offices, Events Marquees, Warehouses, Military uses, Commercial
kitchens, Hospitals, Schools, Reception areas
Figure 1
Water-cooled split
portable Air Conditioner
Please read and save this manual. Read carefully before attempting to assemble, install, operate or maintain
the product described.
Protect yourself and others by observing all safety information. Failure to comply with manual could result in
personal injury and/or property damage! Retain manual for future reference.
Model
WSC-4000 16,000BTU (4.7Kw) R410A (0.90kg) 230V, 1phase, 50hz 15A 18~50°C
WSC-6000 22,000BTU (6.5Kw) R410A (0.86kg) 230V, 1phase, 50hz 15A
Cooling Capacity Refrigerant Electrical supply Recommended
Fuse Size(MCCB) Operating range
18~50°C
Model
WSC-4000 705 / 350 /
865mm / 91kg
565 / 275 /
405mm / 24kg
2780 / 700㎥/h
WSC-6000 705 / 350 /
865mm / 95kg
665 / 275 /
455mm / 24kg 21020 / 800㎥/h
Depth/Width/
Height/Weight
(Indoor unit)
Depth/Width/
Height/Weight
(outdoor unit)
Fan speeds Air flow (high/low) Noise level at 3m
(Indoor unit, high/low) Control
58 / 54 dBA Electronic
56 / 52 dBA Electronic
NOTE: Refrigerant and Electrical supply can be different per country. Please check the label on the unit for
proper information.
12
WSC-4000 / WSC-6000Owner’s manual
Printed in July, 2016
LIMTED WARRANTY
WELTEM ONE-YEAR LIMITED WARRNTY. WELTEM PORTABLE AIR CONDITIONERS, MODELS
COVERED IN THIS MANUAL, ARE WARRANTED BY WELTEM TO THE ORIGINAL USER AGAINST
DEFECTS IN WORK MANSHIP OR MATERIALS UNDER NORMAL USE FOR ONE YEAR AFTER DATE
OF PURCHASE. ANY PART WHICH IS DETERMINED TO BE DEFECTIVE IN MATERIAL OR WORKMAN-
SHIP AND RETURNED TO AN AUTHORIZED SERVICE LOCATION, WELTEM DESIGNATES, SHIPPING
COSTS PREPAID, WILL BE, AS THE EXCLUSIVE REMEDY, REPAIRED OR REPLACED BY WELTEM
OPTION. FOR LIMITED WARRANTY CLAIM PROCEDURES, SEE “PROMPT DISPOSITION” BELOW. THIS
LIMITED WARRANTY GIVE PURCHASERS SPECIFIC LEGAL RIGHTS WHICH VARY FROM JURISDICT-
ION TO JURISDICTION.
LIMITATION OF LIABILITY. TO THE EXTENT ALLOWABLE UNDER APPLICABLE LAW, WELTEM LIABILITY
FOR CONSEQUENTIAL AND INCIDENTAL DAMAGES IS EXPRESSLY DISCLAIMED. WELTEM LIABILITY
IN ALL EVENTS IS LIMITED TO AND SHALL NOT EXCEED THE PURCHASE PRICE PAID.
WARRANTY DISCLAIMER. A DILIGENT EFFORT HAS BEEN MADE TO PROVIDE PRODUCT INFORMATION
AND ILLUSTRATE THE PRODUCTS IN THIS LITERATURE ACCURATELY; HOWEVER, SUCH INFORMATION
AND ILLUSTRATIONS ARE FOR THE SOLE PURPOSE OF IDENTIFICATION, AND DO NOT EXPRESS OR
IMPLY A WARRANTY THAT THE PRODUCTS ARE MERCHANTABLE, OR FIT FOR PARTICULAR PURPOSE,
OR THAT THE PRODUCTS WILL NECESSARILY CONFORM TO THE ILLUSTRATIONS OR DESCRIPTIONS.
EXCEPT AS PROVIDED BELOW, NO WARRANTY OF AFFIRMATION OF FACT, EXPRESSED OR IMPLIED,
OTHER THAT AS STATED IN THE "LIMITED WARRANTY" ABOVE IS MADE OR AUTHORIZED BY WELTEM.
Technical Advice and Recommendations, Disclaimer. Notwithstanding any past practice or dealings or trade
custom, sales shall not include the furnishing of technical advice or assistance or system design. Weltem assumes
no obligations or liability on account of any unauthorized recommendations, opinions or advice as to the choice,
installation or use of products.
Product Suitability. Many jurisdictions have codes and regulations governing sales, construction, installation, and/
or use of products for certain purposes, which may vary from those in neighboring areas. While attempts are made
to assure that Weltem products comply with such codes, Weltem cannot guarantee compliance, and cannot be
responsible for how the product is installed or used. Before purchase and use of a product, review the product
applications, and all applicable national and local codes and regulations, and be sure that the product, installation,
and use will comply with them.
Certain aspects of disclaimers are not applicable to consumer products; e.g., (a) some jurisdictions do not allow
the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not
apply to you; (b) also, some jurisdictions do not allow a limitation on how long an implied warranty lasts,
consequently the above limitation may not apply to you; and (c) by law, during the period of this Limited Warranty,
any implied warranties of implied merchantability or fitness for a particular purpose applicable to consumer
products purchased by consumers, may not be excluded or otherwise disclaimed.
Prompt Disposition. A good faith effort will be made for prompt correction or other adjustment with the respect
to any product which proves to be defective within limited warranty. For any product believed to be defective within
limited warranty, first write or call dealer from whom the product was purchased. Dealer will give additional direc
tions. If unable to resolve satisfactorily, write to Weltem at the address below, giving dealer’s name, address, date,
and number of dealer’s invoice, and describing the nature of the defect. Title and risk of loss pass to buyer on
delivery to common carrier. If product was damaged in transit to you, file claim with carrier.
Manufactured in Weltem co., Ltd., 118, Jayumuyeok 3-gil, Masanhoewon-gu, Changwon-City,
Gyeongsangnam-do, 51340 Korea
www.weltem.com

3
WSC-4000 / WSC-6000Owner’s manual
Assembly
Figure 4
COMPONENT PARTS
Outlet hole
(discharge spot of cool air)
Front and Left Side View
EVAPORATOR / Evaporator filter
(Suction spot of indoor air)
Display / Electronic controller
Upper handle
Exhaust part
(discharge spot of hot air)
Electrical part
(Electrical control box)
Side handle
Cooling water air purge control
CONDENSER
(Fresh air inlet for cooling nonfreezing-cooling-water)
Caster
Figure 2
Figure 3
Back and Right Side View
OUTDOOR
UNIT
( )
OUTDOOR
UNIT
( )
INDOOR
UNIT
( )
INDOOR
UNIT
( )
NOTE: When this air conditoner
produced, Air purge bolt is
opened by 2 rotations.
This is to remove air in the
hoses of cooling water and to
return some cooling water to
the tank of cooling water.
b. Tie-up bolt
a. Air purge bolt
Open Colse
Coolant Water : Coolant Water standard Rao : 30%
(It depends on regulaon of countries)
2
WSC-4000 / WSC-6000Owner’s manual
Please read this manual carefully for instructions on correct installation and usage. Please read all safeguards.
1. Transport and store the unit in an upright position only. Leave unit in an upright position for at least 3 hours
before first use.
2. Always place the unit on an even, level surface.
3. Ensure the unit is connected to a grounded power supply of the correct rating / capacity.
4. The unit will cool when the room temperature is between 18°C (64.4°F) ~ 50°C(122°F) depending on
the thermostat setting.
5. DO NOT use this unit for functions other than those described in this instruction manual.
6. DO NOT tilt the unit.
7. DO NOT cover or obstruct the unit's inlet and outlet grilles.
8. DO NOT use the unit in areas where it will be exposed to rain or water.
9. NEVER unplug the unit while it is operating.
10. DO NOT place any foreign objects on the unit.
11. DO NOT operate the unit with wet or damp hands.
12. DO NOT allow chemical substances to come into contact with the unit.
13. DO NOT operate the unit in the presence of flammable substances or vapors such as alcohols, pesticides,
gasoline, etc.
14. DO NOT use the plug to start and to stop the unit. Always use the control panel to start and to stop the unit.
15. Always turn off the unit when it is not in use and unplug the power plug from the electrical outlet.
16. Always turn the unit off and unplug the main power plug from the electrical outlet before cleaning, moving or
performing maintenance.
17. AVOID the use of adapter plugs or extension cords. If it is necessary to use an extension cord or an adapter
plug to operate the unit, ensure that they are correctly rated for the application. Consult a local qualified
electrician and all local electrical codes to ensure proper setup. Any extension cord used with this device must
be rated for a minimum of 15A.
18. DO NOT unplug the unit by pulling on the electrical cord. Keep electrical cord away from heat sources and
always completely unroll the cord to avoid overheating. If the power cord becomes damaged, a qualified
service agent, qualified electrician, or similarly qualified person must replace it, in order to avoid a hazard
or shock.
19. The filters must be used with the product at all times. When the filters are removed for cleaning, always ensure
that the unit has been turned off and unplugged from the electrical outlet.
20. Regularly clean the filters to maintain efficiency. If the filters are not cleaned regularly, the units output
performance and efficiency will decline and energy consumption will increase.
21. DO NOT operate the unit with a damaged power cord or plug, after it malfunctions, has been dropped or
damaged.
22. Only use in the upright position on an even, flat surface. Unit must be positioned at least 24 inches (60 cm)
from the nearest object in front.
23. Stop operation immediately if abnoraml noise or odor is noticed. Contact a local service center.
24. Appliance is not to used by children or persons with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been given supervision or instruction.
25. Children being supervised not to play with appliance.
26. That the appliance shall be installed in accordance with national wiring regulations.
27. If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
DO NOT use the unit in wet environments, such as a laundry room, to avoid
the risk of electrical shock.
General Safety Information
DO NOT operate the unit in explosive or flammable environments.
DO NOT operate a unit with a damaged power cord.
SAVE THESE INSTRUCTIONS

3
WSC-4000 / WSC-6000Owner’s manual
Assembly
Figure 4
COMPONENT PARTS
Outlet hole
(discharge spot of cool air)
Front and Left Side View
EVAPORATOR / Evaporator filter
(Suction spot of indoor air)
Display / Electronic controller
Upper handle
Exhaust part
(discharge spot of hot air)
Electrical part
(Electrical control box)
Side handle
Cooling water air purge control
CONDENSER
(Fresh air inlet for cooling nonfreezing-cooling-water)
Caster
Figure 2
Figure 3
Back and Right Side View
OUTDOOR
UNIT
( )
OUTDOOR
UNIT
( )
INDOOR
UNIT
( )
INDOOR
UNIT
( )
NOTE: When this air conditoner
produced, Air purge bolt is
opened by 2 rotations.
This is to remove air in the
hoses of cooling water and to
return some cooling water to
the tank of cooling water.
b. Tie-up bolt
a. Air purge bolt
Open Colse
Coolant Water : Coolant Water standard Rao : 30%
(It depends on regulaon of countries)
2
WSC-4000 / WSC-6000Owner’s manual
Please read this manual carefully for instructions on correct installation and usage. Please read all safeguards.
1. Transport and store the unit in an upright position only. Leave unit in an upright position for at least 3 hours
before first use.
2. Always place the unit on an even, level surface.
3. Ensure the unit is connected to a grounded power supply of the correct rating / capacity.
4. The unit will cool when the room temperature is between 18°C (64.4°F) ~ 50°C(122°F) depending on
the thermostat setting.
5. DO NOT use this unit for functions other than those described in this instruction manual.
6. DO NOT tilt the unit.
7. DO NOT cover or obstruct the unit's inlet and outlet grilles.
8. DO NOT use the unit in areas where it will be exposed to rain or water.
9. NEVER unplug the unit while it is operating.
10. DO NOT place any foreign objects on the unit.
11. DO NOT operate the unit with wet or damp hands.
12. DO NOT allow chemical substances to come into contact with the unit.
13. DO NOT operate the unit in the presence of flammable substances or vapors such as alcohols, pesticides,
gasoline, etc.
14. DO NOT use the plug to start and to stop the unit. Always use the control panel to start and to stop the unit.
15. Always turn off the unit when it is not in use and unplug the power plug from the electrical outlet.
16. Always turn the unit off and unplug the main power plug from the electrical outlet before cleaning, moving or
performing maintenance.
17. AVOID the use of adapter plugs or extension cords. If it is necessary to use an extension cord or an adapter
plug to operate the unit, ensure that they are correctly rated for the application. Consult a local qualified
electrician and all local electrical codes to ensure proper setup. Any extension cord used with this device must
be rated for a minimum of 15A.
18. DO NOT unplug the unit by pulling on the electrical cord. Keep electrical cord away from heat sources and
always completely unroll the cord to avoid overheating. If the power cord becomes damaged, a qualified
service agent, qualified electrician, or similarly qualified person must replace it, in order to avoid a hazard
or shock.
19. The filters must be used with the product at all times. When the filters are removed for cleaning, always ensure
that the unit has been turned off and unplugged from the electrical outlet.
20. Regularly clean the filters to maintain efficiency. If the filters are not cleaned regularly, the units output
performance and efficiency will decline and energy consumption will increase.
21. DO NOT operate the unit with a damaged power cord or plug, after it malfunctions, has been dropped or
damaged.
22. Only use in the upright position on an even, flat surface. Unit must be positioned at least 24 inches (60 cm)
from the nearest object in front.
23. Stop operation immediately if abnoraml noise or odor is noticed. Contact a local service center.
24. Appliance is not to used by children or persons with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been given supervision or instruction.
25. Children being supervised not to play with appliance.
26. That the appliance shall be installed in accordance with national wiring regulations.
27. If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
DO NOT use the unit in wet environments, such as a laundry room, to avoid
the risk of electrical shock.
General Safety Information
DO NOT operate the unit in explosive or flammable environments.
DO NOT operate a unit with a damaged power cord.
SAVE THESE INSTRUCTIONS

5
WSC-4000 / WSC-6000Owner’s manual
Operation
CONTROL PANEL
1. POWER BUTTON: Activates unit when POWER BUTTON is pressed. (Fan starts on low speed).
If power button is pressed during operation, unit stops.
2. BLOWER BUTTON: Changes fan speed from (Low) to (High) when pressed.
3. SPOT/COOL BUTTON: Activates compressor and begins producing cool air 2 minutes after button is pressed.
Regulates temperature based on outlet cool air temperature.
4. ROOM/COOL BUTTON: Activates compressor and produces cool air 2 minutes after button is pressed.
Regulates temperature based on inlet ambient air temperature.
5. SET TEMP BUTTONS: Change target temperature/data value by +/- 1. Change data value by +/- 10 by
pressing continually.
Press the SET TEMP BUTTONS to set temperature.
Upper button is to heighten temperature and Lower button is to lower temperture.
6. ALARM: Alarm indicator lights (blinks) and indicates abnormal system operation. If Alarm occurs, compressor
stops.System operation stops when ALARM light is activated (blinks) longer than 3 minutes.
7. CURRENT TEMP: Displays current room temperature in display in Celsius. (In Room Cool Mode only).
SPOT/COOL Mode – Displays outlet (cool air) temperature during normal operations. ALARM codes blink and
are displayed when abnormal operation occurs.
8. TARGET TEMP displays the unit set temperature for ROOMCOOL mode only.
TIMER: Enter to Timer setting mode if you press SPOT/COOL button and ROOM/COOL button together for
3 seconds. Press UP/DOWN button to set the timer until it shows the figure you want to set. After 3
seconds, the figure will be memorized and compressor will stop after the time set.
Figure 7
1 2 3 4
56
87
4
WSC-4000 / WSC-6000Owner’s manual
Unlock the casters and push the unit using the side handles to a flat, level surface and set the caster brakes to
the locked position.
Check the prongs and surface of the power cord plug for dust/dirt. If dust and/or dirt are present, wipe off with
a clean, dry cloth.
Check the power cord, plug and prongs for damage or excess play.
If any damage or excess play is found, contact a qualified repair technician or a qualified electrician to perform
replacement or repair of the power cord, plug or prongs.
NOTE: Make sure the AC outlet is free of dirt, dust, oil, water, or any other foreign material.
Do not use the unit in explosive environments or in areas where flammable
gas leakage may occur.
If the power cord or plug is damaged, repair should only be performed by
qualified electrical personnel.
Do not connect / disconnect the power cord or attempt to operate buttons with
wet hands. This could result in electrical shock.
Do not install the unit on uneven or sloping surface. The unit may roll or topple
over even if the casters are set to the locked position.
Do not use the Indoor unit in areas where it will be exposed to rain or water.
Do not use the unit in a corrosive atmosphere.
Do not use the unit above 18°C(64.4°F) ~ 52°C(125.6°F).
Installation
WARNINGS REGARDING PROPER LOCATION FOR INSTALLATION
MOVING THE UNIT
PLUGGING IN THE UNIT
Connect between the same numbers.
1. Power cord : To supply power to the outdoor unit.
2. Drain hose : To drain condensate to the outside.
3. Cooling water line and coupling (Cool water)
4. Cooling water line and coupling (Hot water)
NOTE: Cooling water lines are 5 meters or
10 meters in length. please check with
the shop you bought this unit.
HOW TO CONNECT THE LINES BETWEEN INDOOR UNIT AND OUTDOOR UNIT
Assembly(Continued)
1 2 3 4
Figure 5 Figure 6
IN OUT
INDOOR UNIT OUTDOOR UNIT
1
3
4
2
IN OUT

5
WSC-4000 / WSC-6000Owner’s manual
Operation
CONTROL PANEL
1. POWER BUTTON: Activates unit when POWER BUTTON is pressed. (Fan starts on low speed).
If power button is pressed during operation, unit stops.
2. BLOWER BUTTON: Changes fan speed from (Low) to (High) when pressed.
3. SPOT/COOL BUTTON: Activates compressor and begins producing cool air 2 minutes after button is pressed.
Regulates temperature based on outlet cool air temperature.
4. ROOM/COOL BUTTON: Activates compressor and produces cool air 2 minutes after button is pressed.
Regulates temperature based on inlet ambient air temperature.
5. SET TEMP BUTTONS: Change target temperature/data value by +/- 1. Change data value by +/- 10 by
pressing continually.
Press the SET TEMP BUTTONS to set temperature.
Upper button is to heighten temperature and Lower button is to lower temperture.
6. ALARM: Alarm indicator lights (blinks) and indicates abnormal system operation. If Alarm occurs, compressor
stops.System operation stops when ALARM light is activated (blinks) longer than 3 minutes.
7. CURRENT TEMP: Displays current room temperature in display in Celsius. (In Room Cool Mode only).
SPOT/COOL Mode – Displays outlet (cool air) temperature during normal operations. ALARM codes blink and
are displayed when abnormal operation occurs.
8. TARGET TEMP displays the unit set temperature for ROOMCOOL mode only.
TIMER: Enter to Timer setting mode if you press SPOT/COOL button and ROOM/COOL button together for
3 seconds. Press UP/DOWN button to set the timer until it shows the figure you want to set. After 3
seconds, the figure will be memorized and compressor will stop after the time set.
Figure 7
1 2 3 4
56
87
4
WSC-4000 / WSC-6000Owner’s manual
Unlock the casters and push the unit using the side handles to a flat, level surface and set the caster brakes to
the locked position.
Check the prongs and surface of the power cord plug for dust/dirt. If dust and/or dirt are present, wipe off with
a clean, dry cloth.
Check the power cord, plug and prongs for damage or excess play.
If any damage or excess play is found, contact a qualified repair technician or a qualified electrician to perform
replacement or repair of the power cord, plug or prongs.
NOTE: Make sure the AC outlet is free of dirt, dust, oil, water, or any other foreign material.
Do not use the unit in explosive environments or in areas where flammable
gas leakage may occur.
If the power cord or plug is damaged, repair should only be performed by
qualified electrical personnel.
Do not connect / disconnect the power cord or attempt to operate buttons with
wet hands. This could result in electrical shock.
Do not install the unit on uneven or sloping surface. The unit may roll or topple
over even if the casters are set to the locked position.
Do not use the Indoor unit in areas where it will be exposed to rain or water.
Do not use the unit in a corrosive atmosphere.
Do not use the unit above 18°C(64.4°F) ~ 52°C(125.6°F).
Installation
WARNINGS REGARDING PROPER LOCATION FOR INSTALLATION
MOVING THE UNIT
PLUGGING IN THE UNIT
Connect between the same numbers.
1. Power cord : To supply power to the outdoor unit.
2. Drain hose : To drain condensate to the outside.
3. Cooling water line and coupling (Cool water)
4. Cooling water line and coupling (Hot water)
NOTE: Cooling water lines are 5 meters or
10 meters in length. please check with
the shop you bought this unit.
HOW TO CONNECT THE LINES BETWEEN INDOOR UNIT AND OUTDOOR UNIT
Assembly(Continued)
1 2 3 4
Figure 5 Figure 6
IN OUT
INDOOR UNIT OUTDOOR UNIT
1
3
4
2
IN OUT

7
WSC-4000 / WSC-6000Owner’s manual
Frost prevention
sensor and
Abnormal
temperature
sensor value
Refrigerant high
pressure switch
Abnormal
temperature
sensor value
Abnormal
temperature
sensor value
Compressor
overloaded
Condensate
water level
alarm
a. Indoor heat
exchanger
temperature too low
b. TH3 temperature
sensor has a loose or
broken connection
a. Blocked air filter
b. Ambient temperature
is too high
c. Cooling pump is
not operate normally
d. Power is not supplied
to outdoor unit
TH1 outlet temperature
sersor has a loose or
broken connection
TH2 inlet temperature
sensor has a loose or
broken connection
Drain of condensate
water is not working
well.
a. Ambient temperature
is too high
b. Unstable voltage
supply
c. Defective compressor
a. Do not use the air
conditioner if ambient
temperature is lower than
18°C (64°F)
b. Contact a qualified
service agent
a. Clean air filter
b. Do not use the air
conditioner if ambient
temperature is higher than
52°C(125.6°F)
c. Check Cooling pump
is operating normally.
Check the cooling water
line between indoor and
outdoor unit is folded.
d. Connect power cord
between indoor unit and
outdoor unit
Contact service center if
poroblem persists
Contact service center
Contact service center
a. Do not use the air
conditioner if ambient
temperature is higher than
52°C(125.6°F)
b. Contact service center if
problem persists.
c. Replace compressor
a. Turn off and on the unit.
b. Check if drain of
condensate water is
working well.
6
WSC-4000 / WSC-6000Owner’s manual
There is 1 evaporator filter in front of the unit.
1. loosen up 2 bolts on the front filter guard.
2. Slide filter up and use a vacuum cleaner to remove the dust from the filter.
3. If the filter is heavily covered with dust and dirt, warm water and mild soap or neutral detergent may be used to
wash the filter. Do not use any other chemicals to clean filter, as they will likely damage the filter.
4. Dry the filter in a shaded area before replacing it. Do not operate the unit without the filter installed and the filter
guard in the closed position.
5. Replace the clean filter and close the filter guard.
NOTE: For effective cooling clean the filter at least every 2 weeks.
– Remove dust from the filter
using a vacuum cleaner
hose attachment.
– If required wash the filter in
lukewarm water with a mild
detergent. Leave to dry in
a shaded area before
reinstalling.
Figure 8 – Removing Filter Figure 9 – Removal of Dust
Maintenance
FILTER CLEANING
(See Figures 8 and 9)
SELF-DIAGNOSTIC CODES
(See Table 1)
The alarm light is activated if abnormal operation occurs, and a code is displayed on the control panel.
The compressor and condenser fan motor will stop operating. The evaporator fan will continue to run for 3 minutes.
If the fault is rectified within 3 minutes, the unit will resume operation. If the fault persists for more than 3 minutes,
the evaporator fan also stops. The fault must be rectified before the unit can resume normal operation.
Customer: Please read and keep this manual for future
reference and keep sales receipt as proof of purchase.
Product
Model No.
Date of Purchase
Place of Purchase
Serial No.
Period of Warranty
Water - cooled split
Portable Air Conditioner
Do not operate without the filter fitted.
Do not operate the unit with a damaged cord or plug, after the unit malfunctions,
or if the unit has been dropped or damaged.
– For your convenience, record the complete model number and product name (located on the Product
Identification Plate), the purchase date, purchase location, serial number, and warranty period in the table below.
– Also, attach your purchase receipt as proof of purchase to this instruction manual for future reference.
– To ensure your product is covered by warranty, the complete faulty product along with your original purchase
receipt must be provided at the place of purchase.

7
WSC-4000 / WSC-6000Owner’s manual
Frost prevention
sensor and
Abnormal
temperature
sensor value
Refrigerant high
pressure switch
Abnormal
temperature
sensor value
Abnormal
temperature
sensor value
Compressor
overloaded
Condensate
water level
alarm
a. Indoor heat
exchanger
temperature too low
b. TH3 temperature
sensor has a loose or
broken connection
a. Blocked air filter
b. Ambient temperature
is too high
c. Cooling pump is
not operate normally
d. Power is not supplied
to outdoor unit
TH1 outlet temperature
sersor has a loose or
broken connection
TH2 inlet temperature
sensor has a loose or
broken connection
Drain of condensate
water is not working
well.
a. Ambient temperature
is too high
b. Unstable voltage
supply
c. Defective compressor
a. Do not use the air
conditioner if ambient
temperature is lower than
18°C (64°F)
b. Contact a qualified
service agent
a. Clean air filter
b. Do not use the air
conditioner if ambient
temperature is higher than
52°C(125.6°F)
c. Check Cooling pump
is operating normally.
Check the cooling water
line between indoor and
outdoor unit is folded.
d. Connect power cord
between indoor unit and
outdoor unit
Contact service center if
poroblem persists
Contact service center
Contact service center
a. Do not use the air
conditioner if ambient
temperature is higher than
52°C(125.6°F)
b. Contact service center if
problem persists.
c. Replace compressor
a. Turn off and on the unit.
b. Check if drain of
condensate water is
working well.
6
WSC-4000 / WSC-6000Owner’s manual
There is 1 evaporator filter in front of the unit.
1. loosen up 2 bolts on the front filter guard.
2. Slide filter up and use a vacuum cleaner to remove the dust from the filter.
3. If the filter is heavily covered with dust and dirt, warm water and mild soap or neutral detergent may be used to
wash the filter. Do not use any other chemicals to clean filter, as they will likely damage the filter.
4. Dry the filter in a shaded area before replacing it. Do not operate the unit without the filter installed and the filter
guard in the closed position.
5. Replace the clean filter and close the filter guard.
NOTE: For effective cooling clean the filter at least every 2 weeks.
– Remove dust from the filter
using a vacuum cleaner
hose attachment.
– If required wash the filter in
lukewarm water with a mild
detergent. Leave to dry in
a shaded area before
reinstalling.
Figure 8 – Removing Filter Figure 9 – Removal of Dust
Maintenance
FILTER CLEANING
(See Figures 8 and 9)
SELF-DIAGNOSTIC CODES
(See Table 1)
The alarm light is activated if abnormal operation occurs, and a code is displayed on the control panel.
The compressor and condenser fan motor will stop operating. The evaporator fan will continue to run for 3 minutes.
If the fault is rectified within 3 minutes, the unit will resume operation. If the fault persists for more than 3 minutes,
the evaporator fan also stops. The fault must be rectified before the unit can resume normal operation.
Customer: Please read and keep this manual for future
reference and keep sales receipt as proof of purchase.
Product
Model No.
Date of Purchase
Place of Purchase
Serial No.
Period of Warranty
Water - cooled split
Portable Air Conditioner
Do not operate without the filter fitted.
Do not operate the unit with a damaged cord or plug, after the unit malfunctions,
or if the unit has been dropped or damaged.
– For your convenience, record the complete model number and product name (located on the Product
Identification Plate), the purchase date, purchase location, serial number, and warranty period in the table below.
– Also, attach your purchase receipt as proof of purchase to this instruction manual for future reference.
– To ensure your product is covered by warranty, the complete faulty product along with your original purchase
receipt must be provided at the place of purchase.

9
WSC-4000 / WSC-6000Owner’s manual
Symptom Possible Cause(s) Corrective Action
No air flow from
the indoor unit
1. Check the power supply
to verify that power is
available to the unit.
2. Verify that the power cord is connected.
1. Reset the circuit breaker
and restart the unit.
2. Connect power cord.
Clean filter
1. Press ROOM/COOL
button or SPOT/COOL button
2. Verify that 2 minutes has
passed since the unit restarted.
3. The temperature of the
compressor can be higher
when the ambient temperature is
too high.
The compressor will not work
unless the ambient air temperature
is within the acceptable operating
range of the unit.
Blocked air filter
1. Only BlOWER light on.
ROOM/COOL and
SPOT/COOL light off
2. Compressor will start
in 2 minutes after unit is restarting
3. The ambient temperature
may be too high
Connect cooling water line properlyCooling water line is not connected
properly
Insufficient air flow from
the indoor unit
Air from the room unit is
not cool
Abnormal noise from
the pump
Troubleshooting chart
8
WSC-4000 / WSC-6000Owner’s manual
Figure 10 - Circuit Wiring Diagram
Wiring Diagram
OUTDOOR
COND’
MOTOR
INDOOR
EVAP’
MOTOR
WATER
PUMP
W/P
C/M
C/M
D/P
D/P
W/P
DRAIN
PUMP
FU
NOISE FILTER
MCCB

9
WSC-4000 / WSC-6000Owner’s manual
Symptom Possible Cause(s) Corrective Action
No air flow from
the indoor unit
1. Check the power supply
to verify that power is
available to the unit.
2. Verify that the power cord is connected.
1. Reset the circuit breaker
and restart the unit.
2. Connect power cord.
Clean filter
1. Press ROOM/COOL
button or SPOT/COOL button
2. Verify that 2 minutes has
passed since the unit restarted.
3. The temperature of the
compressor can be higher
when the ambient temperature is
too high.
The compressor will not work
unless the ambient air temperature
is within the acceptable operating
range of the unit.
Blocked air filter
1. Only BlOWER light on.
ROOM/COOL and
SPOT/COOL light off
2. Compressor will start
in 2 minutes after unit is restarting
3. The ambient temperature
may be too high
Connect cooling water line properlyCooling water line is not connected
properly
Insufficient air flow from
the indoor unit
Air from the room unit is
not cool
Abnormal noise from
the pump
Troubleshooting chart
8
WSC-4000 / WSC-6000Owner’s manual
Figure 10 - Circuit Wiring Diagram
Wiring Diagram
OUTDOOR
COND’
MOTOR
INDOOR
EVAP’
MOTOR
WATER
PUMP
W/P
C/M
C/M
D/P
D/P
W/P
DRAIN
PUMP
FU
NOISE FILTER
MCCB

11
Notes
WSC-4000 / WSC-6000Owner’s manual
10
Notes
WSC-4000 / WSC-6000Owner’s manual

11
Notes
WSC-4000 / WSC-6000Owner’s manual
10
Notes
WSC-4000 / WSC-6000Owner’s manual

WSC-4000 / WSC-6000
WSC-4000 / WSC-6000
Owner’s manual
Features
Typical uses
Specifications
Weltem WSC-4000 / WSC-6000 are designed for a fast installation and
start up. They can be used usefully where access to the outside is
difficult and some distance from internal rooms because outdoor
unit (heat exchanger) can be placed up to 30 meters. They are
economical units which does not need providing of the water
continuously. Quiet in operation enables them to be used in general
offices as well. With their durable metal construction and 4 wheels,
they are very useful for rental. They are space-efficient because they
don’t need to have hot air exhaust duct. A control panel provides ease
of use and contains a self-diagnostic function.
Choice of continuous operation or automatic timer.
1
Computer server rooms, Tents, Offices, Events Marquees, Warehouses, Military uses, Commercial
kitchens, Hospitals, Schools, Reception areas
Figure 1
Water-cooled split
portable Air Conditioner
Please read and save this manual. Read carefully before attempting to assemble, install, operate or maintain
the product described.
Protect yourself and others by observing all safety information. Failure to comply with manual could result in
personal injury and/or property damage! Retain manual for future reference.
Model
WSC-4000 16,000BTU (4.7Kw) R410A (0.90kg) 230V, 1phase, 50hz 15A 18~50°C
WSC-6000 22,000BTU (6.5Kw) R410A (0.86kg) 230V, 1phase, 50hz 15A
Cooling Capacity Refrigerant Electrical supply Recommended
Fuse Size(MCCB) Operating range
18~50°C
Model
WSC-4000 705 / 350 /
865mm / 91kg
565 / 275 /
405mm / 24kg
2780 / 700㎥/h
WSC-6000 705 / 350 /
865mm / 95kg
665 / 275 /
455mm / 24kg 21020 / 800㎥/h
Depth/Width/
Height/Weight
(Indoor unit)
Depth/Width/
Height/Weight
(outdoor unit)
Fan speeds Air flow (high/low) Noise level at 3m
(Indoor unit, high/low) Control
58 / 54 dBA Electronic
56 / 52 dBA Electronic
NOTE: Refrigerant and Electrical supply can be different per country. Please check the label on the unit for
proper information.
12
WSC-4000 / WSC-6000Owner’s manual
Printed in July, 2016
LIMTED WARRANTY
WELTEM ONE-YEAR LIMITED WARRNTY. WELTEM PORTABLE AIR CONDITIONERS, MODELS
COVERED IN THIS MANUAL, ARE WARRANTED BY WELTEM TO THE ORIGINAL USER AGAINST
DEFECTS IN WORK MANSHIP OR MATERIALS UNDER NORMAL USE FOR ONE YEAR AFTER DATE
OF PURCHASE. ANY PART WHICH IS DETERMINED TO BE DEFECTIVE IN MATERIAL OR WORKMAN-
SHIP AND RETURNED TO AN AUTHORIZED SERVICE LOCATION, WELTEM DESIGNATES, SHIPPING
COSTS PREPAID, WILL BE, AS THE EXCLUSIVE REMEDY, REPAIRED OR REPLACED BY WELTEM
OPTION. FOR LIMITED WARRANTY CLAIM PROCEDURES, SEE “PROMPT DISPOSITION” BELOW. THIS
LIMITED WARRANTY GIVE PURCHASERS SPECIFIC LEGAL RIGHTS WHICH VARY FROM JURISDICT-
ION TO JURISDICTION.
LIMITATION OF LIABILITY. TO THE EXTENT ALLOWABLE UNDER APPLICABLE LAW, WELTEM LIABILITY
FOR CONSEQUENTIAL AND INCIDENTAL DAMAGES IS EXPRESSLY DISCLAIMED. WELTEM LIABILITY
IN ALL EVENTS IS LIMITED TO AND SHALL NOT EXCEED THE PURCHASE PRICE PAID.
WARRANTY DISCLAIMER. A DILIGENT EFFORT HAS BEEN MADE TO PROVIDE PRODUCT INFORMATION
AND ILLUSTRATE THE PRODUCTS IN THIS LITERATURE ACCURATELY; HOWEVER, SUCH INFORMATION
AND ILLUSTRATIONS ARE FOR THE SOLE PURPOSE OF IDENTIFICATION, AND DO NOT EXPRESS OR
IMPLY A WARRANTY THAT THE PRODUCTS ARE MERCHANTABLE, OR FIT FOR PARTICULAR PURPOSE,
OR THAT THE PRODUCTS WILL NECESSARILY CONFORM TO THE ILLUSTRATIONS OR DESCRIPTIONS.
EXCEPT AS PROVIDED BELOW, NO WARRANTY OF AFFIRMATION OF FACT, EXPRESSED OR IMPLIED,
OTHER THAT AS STATED IN THE "LIMITED WARRANTY" ABOVE IS MADE OR AUTHORIZED BY WELTEM.
Technical Advice and Recommendations, Disclaimer. Notwithstanding any past practice or dealings or trade
custom, sales shall not include the furnishing of technical advice or assistance or system design. Weltem assumes
no obligations or liability on account of any unauthorized recommendations, opinions or advice as to the choice,
installation or use of products.
Product Suitability. Many jurisdictions have codes and regulations governing sales, construction, installation, and/
or use of products for certain purposes, which may vary from those in neighboring areas. While attempts are made
to assure that Weltem products comply with such codes, Weltem cannot guarantee compliance, and cannot be
responsible for how the product is installed or used. Before purchase and use of a product, review the product
applications, and all applicable national and local codes and regulations, and be sure that the product, installation,
and use will comply with them.
Certain aspects of disclaimers are not applicable to consumer products; e.g., (a) some jurisdictions do not allow
the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not
apply to you; (b) also, some jurisdictions do not allow a limitation on how long an implied warranty lasts,
consequently the above limitation may not apply to you; and (c) by law, during the period of this Limited Warranty,
any implied warranties of implied merchantability or fitness for a particular purpose applicable to consumer
products purchased by consumers, may not be excluded or otherwise disclaimed.
Prompt Disposition. A good faith effort will be made for prompt correction or other adjustment with the respect
to any product which proves to be defective within limited warranty. For any product believed to be defective within
limited warranty, first write or call dealer from whom the product was purchased. Dealer will give additional direc
tions. If unable to resolve satisfactorily, write to Weltem at the address below, giving dealer’s name, address, date,
and number of dealer’s invoice, and describing the nature of the defect. Title and risk of loss pass to buyer on
delivery to common carrier. If product was damaged in transit to you, file claim with carrier.
Manufactured in Weltem co., Ltd., 118, Jayumuyeok 3-gil, Masanhoewon-gu, Changwon-City,
Gyeongsangnam-do, 51340 Korea
www.weltem.com