Stulz WLA Compact Series User manual

STULZ the natural choice
WLA C MPACT
ENGLISH EN
WLA Compact
Air cooled water chiller
230/1/50, 230/1/60
400/3/50, 460/3/60
Instructions
Translated instructions
Index 04
Revision 09.2015
©STULZ S.p.A. - Italy

Dear Customer,
Thank you for having purchased a STULZ/Cosmotec chiller.
It is the result of decades of research and design studies, with a fine
search of materials and technologies to obtain an high quality chiller.
The CE mark guarantees that the STULZ/Cosmotec products satisfy
the requirements of the European Machinery Directive for safety.
The level of quality is constantly checked at every stage, from design
to production, making the STULZ/Cosmotec products synonymous
of SAFETY, QUALITY and RELIABILITY.
STULZ/Cosmotec Staff

EN//0915/WLA Compact/3
Summary
1. Introduction.....................................................................................................................5
1.1. General information........................................................................................................5
1.2. Symbols used in the manual .........................................................................................5
1.3. Annexes...........................................................................................................................5
2. Safety...............................................................................................................................6
2.1. Introduction.....................................................................................................................6
2.2. General rules...................................................................................................................6
2.3. Residual risk ...................................................................................................................7
2.4. Safety data ......................................................................................................................9
2.5. Labels ........................................................................................................................... 16
2.6. Intended and unintended use......................................................................................18
3. Coding ...........................................................................................................................19
4. Description....................................................................................................................20
4.1. Layout of the components, principle and mode operation.......................................20
4.2. Refrigerant diagrams....................................................................................................20
4.3. Components of the refrigerant circuit ........................................................................25
4.4. Safety components of the refrigerant circuit .............................................................25
4.5. Protection components of the refrigerant circuit ......................................................26
4.6. Hydraulic diagrams ......................................................................................................26
4.7. Components of the hydraulic circuit ..........................................................................27
4.8. Air circuit.......................................................................................................................27
4.9. Protection and control electric components .............................................................27
5. Technical data...............................................................................................................29
5.1. Application limits..........................................................................................................29
5.2. Technical data...............................................................................................................31
5.3. Dimensional drawings .................................................................................................38
6. Handling and storage...................................................................................................41
6.1. Reception ......................................................................................................................41
6.2. Handling ........................................................................................................................42
7. Installation ....................................................................................................................43
7.1. Positioning ....................................................................................................................43
7.2. Hydraulic connections .................................................................................................44
7.3. Electrical connections .................................................................................................45
7.4. Commissioning preliminary operations.....................................................................46
8. Commissioning.............................................................................................................48
8.1. Start up..........................................................................................................................48
8.2. Checks to be performed after start up........................................................................49
8.3. Deactivation ..................................................................................................................49
9. Maintenance..................................................................................................................50
9.1. Warnings .......................................................................................................................50
9.2. Routine maintenance ...................................................................................................51
9.3. Special maintenance....................................................................................................53
10. Troubleshooting............................................................................................................54

EN/0915/WLA Compact/4
STULZ SpA reserves the right to modify the data contained in this manual without prior notice.
The images and illustrations in this manual for illustrative purposes only and they do not constitute contractual ob-
ligation.
11. Decommissioning and disposal..................................................................................56
12. Optional.........................................................................................................................57
12.1. Multi-pole connector (code OC10CC0 ÷ OC20CC0)...................................................58
12.2. Low temperature fluid up to -5°C (code OC10TW0 ÷ OC20TW0) ...................................................58
12.3. Device for low ambient temperature up to -5°C (code OC10TM0 ÷ OC20TM0) .......................58
12.4. Device for low ambient temperature up to -10°C (code OC10TL0 ÷ OC20TL0) .......................59
12.5. Polypropylene air filter with metal mesh (code OC10FP0 ÷ OC20FP0) ......................................59
12.6. Temperature tracking with differential thermostat (code OC10TD0 ÷ OC20TD0) .............59
12.7. Tank electric level with pump stop function(code OC10EL0 ÷ OC20EL0) .........................59
12.8. 50/60 Hz medium pressure pump (code OC10PM0 ÷ OC20PM0) ...................................................59
12.9. Crankcase heater (code OC10HR0 ÷ OC20HR0)......................................................................................59
13. Accessories ..................................................................................................................60
14. Contacts ........................................................................................................................61

EN//0915/WLA Compact/5
1. Introduction
1. 1. General information
The units described in this manual belong to the vapour compression refrigerator system family that use chillers of
group 2, intended for water cooling. This manual contains safety operating instructions to be complied with during
installation, use, and maintenance. Therefore, read and comply with the instructions contained herein.
This manual is intended for the following professionals, who are considered authorised personnel:
The INSTALLER must check that the handling and installation of the chiller is performed according to the occupational
standards and instructions contained in this manual.
The OPERATOR must know and comply with the occupational standards and instructions contained in this manual
in order to use and adjust the chiller correctly.
MAINTENANCE TECHNICIANS (or service technicians) are authorised by the chiller manufacturer to commission
the unit, provide technical assistance, perform routine and special maintenance, and repairs.
Qualified personnel are those who, thanks to their training, education, experience and specific knowledge regarding
occupational standards, are authorised by the safety manager to perform the above mentioned activities.
The manufacturer declines any liability for improper use of the chiller, for any unauthorised
modifications applied, and for failure to comply with the instructions contained in this manual. The
occurrence of any of the above-mentioned conditions will make the product warranty immediately
void and null.
The customer must store this manual and make it available to the personnel in charge of installing,
running, and performing maintenance on the chiller.
1.2. Symbols used in the manual
Danger Danger of death or injury for the operator
Attention Danger of damage to the equipment
Information Important information, usage note
1.3. Annexes
The following annexes are an integral part of this manual.
• Manual part 2: consisting of water-refrigeration diagram, electrical diagram, and CE declaration of conformity;
• electronic control manual (user version).
• accessory (if available) manuals

EN/0915/WLA Compact/6
2. Safety
2.1. Introduction
This chiller is intended for professional use according to reference directives listed in the CE declaration of conformity
attached.
The chiller must be installed in compliance with the following directives:
• 2006/42/EC - Machinery Directive
• 97/23/EC - PED Pressure equipment directive
• 2006/95/EC - Low voltage directive
• 89/336/EC - Electromagnetic compatibility directive
Moreover, the standards in force in the country where the product is installed must be respected.
2.2. General rules
The chillers contain a pressure refrigerant circuit, a hydraulic circuit, and a control electrical panel, which can be
dangerous for persons or objects nearby.
• It is prohibited for unauthorised personnel to access the internal and external danger area.
• It is prohibited to climb onto the chiller.
• It is prohibited to access the chiller.
• It is prohibited to remove the protection panels before disconnecting the power supply.
• It is prohibited to remove, disconnect, tamper with, or alter safety, protection, and emergency devices.
• The external danger area corresponds to the installation area shown in the drawings in paragraph
5.3.
• Interventions on the electric, hydraulic, and refrigerant equipment must be carried out by qualified
personnel.
• Disconnect the unit power supply before working on it. For this purpose, the owner of the unit must
install a protection device upstream the electrical line of the chiller. This protection device consists
of a 0.3 A In differential switch sized according to the maximum consumption (see technical data
sheets).
• The covering panels of the electrical panel are hinged. Once opened, they must be fastened with
specific retainers to prevent sudden movements due to the wind.
• Comply with the instructions indicated in the chapters regarding transport, handling, installation,
commissioning, use, maintenance, and disposal of the product.
• Set the pressure inside the entire refrigerant circuit to the atmospheric pressure before intervening
on any component of the circuit.
• For transport, handling, installation, and maintenance operations, the installers and maintenance
technicians must use PPE according to the safety manager instructions and standards in force
(PPE=personal protective equipment: gloves, helmet, goggles, accident-prevention shows, etc.)
• Comply with the accident-prevention standards.
• Wear suitable clothing to prevent you from being entangled in moving components.

EN//0915/WLA Compact/7
2.3. Residual risk
During transport and installation
Area Danger Risk Preventive measures
Under the unit Defective lifting system of
the unit, which causes the
fall.
Bruises, shocks. Stay outside the danger area while the
unit is being handled.
Close to the unit Accidental shock with
damage to the refrigerant
circuit and leak of high
pressure refrigerant.
Burns, formation of
acid vapours.
Stay outside the danger area while the
unit is being handled. Wear PPE.
Close to the unit Unstable or unsuitable unit
support that causes it to
overturn.
Bruises, shocks. Make sure that the unit support is suitable
for its weight, stable and level. Wear PPE.
Electrical panel Live power supply cables. Electrocution. Make sure to disconnect the power
supply from the distribution panel. Remain
electrically isolated from earth. Wear PPE.
During start up and operation
Area Danger Risk Preventive measures
Close to the unit Projection (launch) of
various tools and small
parts (screws, nuts,
washers, etc.) that may fall
accidentally on the fan
impellers.
Bruises, shocks. During installation, make sure to
remove the tools and other installation
materials. Wear PPE.
Close to the unit Suction and subsequent
removal of objects, dust,
and substances in the
installation site from the
fans.
Bruises, shocks. Clean the installation area. Wear PPE.
In contact with
the unit
Non-compliant electrical
connection and earth
connection missing.
Electrocution. Remain electrically isolated from earth.
Wear PPE.
Close to the
water pipes.
Closed shut-off valves;
leaks from the hydraulic
pipes. Consequent water
and additive leaks.
Irritation of skin and
eyes due to contact
with ethylene glycol.
Irritation of the
skin and breathing
system due to
glycol vapours.
Electrocution.
Slipping.
Open the shut-off valves of the
hydraulic circuit. Wear PPE.
Close to the
water pipes.
Formation of condensate
in the presence of the dew
point with leaks of the non-
insulated pipes.
Electrocution.
Slipping.
Wear PPE.

EN/0915/WLA Compact/8
Area Danger Risk Preventive measures
Close to the unit With unit ON: leaks in the
refrigerant circuit; defective
safety valve or high
pressure switch; fire; shut-
off valves in the refrigerant
circuit closed after
maintenance intervention;
defect in the gas charge
line. Consequent explosive
breakage of the refrigerant
circuit.
Burns, formation of
acid vapours in the
presence of flames.
For installation inside buildings: convey
the safety valve discharge towards
specific outdoor areas.
Open the shut-off valves of the
refrigerant circuit. Wear PPE. In case of
fire, wear fire-fighting masks.
Close to the unit
(electrical panel,
power supply
cables)
Short-circuit; incorrect
sizing of the cables or main
switch.
Electrocution, fire,
formation of acid
vapours.
Check the fixing of the terminal cables;
select the power supply cables and
main switch. Wear PPE. In case of fire,
wear fire-fighting masks.
Close to the unit Noise emission. Injury of the hearing
system.
Wear PPE.
During maintenance
Area Danger Risk Preventive measures
Close to the unit Leaks in the refrigerant
circuit; defective safety
valve and high pressure
switch; fire; defect on
the gas charge line.
Consequent explosive
breakage of the refrigerant
circuit.
Burns, formation of
acid vapours in the
presence of flames.
Wear PPE. In case of fire, wear fire-fighting
masks.
Unit components:
compressor,
compressor
delivery pipes,
condenser.
Contact with hot surfaces. Burns. Avoid contact Wear PPE.
Condenser Contact with sharp
surfaces (fins)
Cuts, bruises. Wear PPE.
Electrical panel Live power supply line even
if the switch on board the
unit is OFF.
Electrocution. Make sure to disconnect the power supply
from the distribution panel. Make sure that
the main switch is not reactivated during
maintenance.
During dismantling operations
Area Danger Risk Preventive measures
Close to the unit Leaks in the refrigerant
circuit; defective
refrigerant recovery
system. Consequent
explosive breakage of the
refrigerant circuit.
Burns, formation of
acid vapours in the
presence of flames.
Wear PPE.
Close to the unit Oil leaks during recovery. Contact between
skin or eyes and oil
Wear PPE.

EN//0915/WLA Compact/9
Area Danger Risk Preventive measures
Close to the
water pipes.
Disconnection of the water
pipes still under pressure.
Irritation of skin and
eyes due to contact
with ethylene glycol.
Electrocution.
Slipping.
De-pressurise the hydraulic circuit before
disconnection. Wear PPE.
Electrical panel Live power supply line
even if the switch on board
the unit is OFF.
Electrocution. Make sure to disconnect the power supply
from the distribution panel. Make sure that
the main switch is not reactivated during
maintenance.
2.4. Safety data
REFRIGERANT SAFETY DATA
1. IDENTIFICATION
OF THE SUBSTANCE/
PREPARATION
Identification of the
preparation
STAR COLD 134a
Recommended uses Refrigerant
2. COMPOSITION /
INFORMATION ON
THE INGREDIENTS
tetrafluoroethane
(C2H2F4)
N° CAS: 811-97-2
N° CE: 212-377-0
Concentration: 100%
3. IDENTIFICATION OF
THE HAZARDS
Possible Hazards Consequences on the environment: not readily biodegradable.
Physical and chemical hazards: thermal decomposition in toxic
and corrosive products.
Additional indications Not dangerous according to Directive 1999/45/EC.
4. FIRST AID
MEASURES
Inhalation Move the victim to a non-contaminated area wearing breathing
equipment. Keep the patient warm and at rest. Call a doctor. Apply
artificial respiration if breathing has stopped.
Contact with skin In case of frostbite, spray with water for at least 15 minutes. Apply
a sterile gauze. And obtain medical assistance.
Contact with eyes Immediately wash the eyes with water for at least 15 minutes.
Ingestion Ingestion is not considered a potential route of exposure.
Protection for first-
aiders
Wear suitable respiratory equipment in case of interventions in
saturated atmosphere.
Most important
symptoms and
effects, both acute
and delayed
In high concentrations, it may cause asphyxiation. Symptoms
may include loss of consciousness. Victims may not be aware of
asphyxiation.
In low concentrations, it may cause narcotic effects. Symptoms
may include headache, nausea and loss of coordination.
Notes for the doctor None.

EN/0915/WLA Compact/10
REFRIGERANT SAFETY DATA
5. FIRE-FIGHTING
MEASURES
Specific hazards Exposure to flames may cause the container to break or explode.
Hazardous
Combustion Products
Due to thermal decomposition, the following products may
originate:
- Carbon monoxide
Hydrogen fluoride
- Carbonyl Fluoride
Specific methods If possible, stop the product from leaking. Coordinate fire-fighting
measures according to the surrounding fire. Exposure to flames
and heat may cause the container to break. Cool down the
containers exposed to this risk with water jets from a protected
position. If possible, use vaporised or sprayed water to remove the
fumes.
Special protection
equipment for fire-
fighters
Use respiratory equipment. Standard protection clothes and
protection devices (respiratory equipment) for fire-fighters.
Standard EN 137, EN 469, EN 659
6. ACCIDENTAL
RELEASE MEASURES
Individual measures Try to stop the leakage. Evacuate the area. Ensure suitable
ventilation. Use the respiratory equipment to access the
involved area unless atmosphere is proved to be unbreathable.
Avoid accessing sewers, basements, or any place where its
accumulation could be dangerous.
Environmental
precautions.
Try to stop the leakage.
Methods and
materials for
containment and
recovery
Ventilate the area.

EN//0915/WLA Compact/11
REFRIGERANT SAFETY DATA
7. HANDLING AND
STORAGE
Handling
Measures
and technical
precautions
Only experienced and trained personnel can handle gas under
pressure The product must be handled according to the good
practices of safety and industrial hygiene. Use only specific
equipment, suitable for the product, pressure and operating
temperature. In case of doubts, contact the manufacturer.
Do not smoke while you handle gas.
Make sure that the entire gas distribution system has been (or is
regularly) checked against leaks before use. Consider the safety
valves in gas installations.
Handling the gas
container safely.
Refer to the manufacturer's instructions to handle the container.
Avoid water suction in the container. Do not allow gas reflux in the
container. Protect the cylinders against physical damage. Do not
drag, roll, slide or make it fall.
Use suitable handling devices (forklifts, hand trolleys, etc.) to move
the cylinders, even if for short distance. Leave the protection caps
of the valves in their position until the container is fixed to the wall
or to a workbench, or is placed on a suitable support ready for
use.
Should the operator have problems during valve operation, stop its
use and contact the supplier.
Never repair or modify the valves of the containers or of the
safety devices. Damaged valves must be signalled to the supplier
immediately. Keep the container valves clean and free from
contaminants, in particular oil and water. Remount the plugs and/
or caps of the valves and container, if supplied, as soon as the
container is disconnected from the equipment.
Close the container valve after every use and when it is empty,
even if it is still connected to the equipment.
Never transfer gas from one cylinder/container to another.
Do not use direct flames or electric heating to increase the internal
pressure of the container.
Do not remove or make the supplier's cylinder identification
labels illegible. Keep the container below 5000 in a ventilated
area. Comply with the standards and local laws in force relative
to the storage of containers. Containers must be stored in vertical
position and secured in order to prevent them from overturning.
The general condition of stored containers must be checked
periodically in order to detect the presence of leaks. The caps and/
or plugs must be mounted. Store the containers in areas away
from the risk of fire, heat and ignition sources. The containers must
not be stored in a way to favour corrosive phenomena. Keep away
from combustible substances.
Special labelling Contains fluorinated greenhouse gases covered by the Kyoto
Protocol: difluoromethane; pentafluorethane.

EN/0915/WLA Compact/12
REFRIGERANT SAFETY DATA
8. EXPOSURE/
PERSONAL
PROTECTION CHECKS
Suitable technical
checks
The systems under pressure must be checked periodically to
verify the absence of leaks.
Use oxygen detectors if there asphyxiating gases are likely
to be released. Make sure that the exposure is far below the
occupational exposure limits. Provide suitable ventilation in the
discharges at a general and local level. Consider the use of a
work permission system, e.g. for maintenance activities.
Personal protection
measures
A risk analysis should be made and documented to evaluate
the risk related to the use of the product and to identify the
PPE suitable for the risks identified. Comply with the following
recommendations.
You must use PPE in compliance with standards EN/ISO
Eyes/face protection
device
Protect the eyes, face, and skin from liquid sprays.
Wear safety glasses with side protection.
Wear safety glasses with side protection or goggles during
top up operations or sleeve disconnection.
Standard EN 166 - Personal eye protection
Skin protection Wear work gloves to handle gas containers.
Standard EN 388 - Protection gloves against mechanical risks.
Wear safety shoes to handle containers.
Standard EN ISO 20345 - Personal Protective Equipment - Safety
footwear.
Protection for
respiratory tracts
In environments with poor oxygen, use a breathing apparatus (SC
BA) or an air line slightly overlapping the mask.
Standard EN 137 - Self-contained open-circuit compressed air
breathing apparatus with full face mask.
Head protection Protective helmet.
Thermal hazards None required.
Work hygiene Emergency eye wash stations should be available in the
vicinity of any potential exposure source.
Do not eat, drink, or smoke during use.
Environment
exposure checks
Refer to the local standards for atmosphere emission restrictions.

EN//0915/WLA Compact/13
REFRIGERANT SAFETY DATA
9. PHYSICAL
AND CHEMICAL
PROPERTIES
Physical state at 20°C I 101 .3kPa Gas
Colour Colourless
Odour Ethereal
Odour Threshold The odour threshold is subjective and
inadequate to detect overexposure.
pH Not applicable
Molecular mass [g/moI] 102
Melting point [°C] -101
Boiling point [°C] -26.5
Critical temperature [°C] 101
Flash point [°C] Not applicable for gas and gas mixtures
Evaporation rate (etherl) Not applicable for gas and gas mixtures
Flammability Limits [vol % in air] Not flammable
Vapour pressure [20°C] 41 bar
Relative density, gas (air=1) 3.6
Solubility in water [mg/I] 1930
n-octanol/water partition coefficient [log
Kow] 0.94
Auto-ignition temperature [°C] Not applicable
Viscosity 20°C [mPa.s] Not applicable
Explosive properties Not applicable
Oxidizing properties None
Other data Gas/Vapour heavier than air It may accumulate in closed spaces,
especially at ground level or below it.
10. STABILITY AND
REACTIVITY
Reactivity There are no other reactivity hazards besides those described in
the paragraphs below.
Chemical stability Stable under normal conditions
Dangerous reactions None
Conditions to be
avoided
None of the storage conditions and recommended use.
Incompatible
materials
Humidity Refer to standard ISO 11114 for further information on
material compatibility
Hazardous
decomposition
products
Under normal storage and use conditions, no hazardous
decomposition products should be generated.

EN/0915/WLA Compact/14
REFRIGERANT SAFETY DATA
11. TOXICOLOGICAL
INFORMATION Acute toxicity This product has no known toxicological effects
Skin corrosion/irritation No effects are known in relation to this product
Serious eye damage/irritation No effects are known in relation to this product
Respiratory or skin sensitization No effects are known in relation to this product
Carcinogenicity No effects are known in relation to this product
Mutagenicity No effects are known in relation to this product
Toxicity for reproduction No effects are known in relation to this product
Specific target organ toxicity
(STOT) - single exposure No effects are known in relation to this product
Specific target organ toxicity
(STOT) - repeated exposure No effects are known in relation to this product
Aspiration hazard Not applicable for gas and gas mixtures
12. ECOLOGICAL
INFORMATION
Toxicity EC50 48h - Daphnia magna [mg/l] 930
EC50 72h - Algae [mg/l] Data not available
CL50 96h - Fish [mg/l] 450
Persistence and
degradability
Not readily biodegradable
Potential for
bioaccumulation
Considered to be not bioaccumulative due to a low log Kow (log
Kow < 4)
Mobility in soil Due to its high volatility, the product is not expected to pollute the
soil and water tables.
Results of the PBT
and vPvB evaluation
Not classified as PBT or vPvB
Other adverse effects Effect on ozone layer None
Global Warming Potential
(GWP) [C02=1]
1300
Effects on global warming If discharged in large
amounts it can contribute
to the greenhouse effect
Contains fluorinated
greenhouse gases covered
by the Kyoto Protocol
13. CONSIDERATIONS
ON DISPOSAL
Waste disposal
methods
Avoid direct discharge in the atmosphere.
Do not discharge where the accumulation can be dangerous.
For further information on suitable disposal methods, refer to the
EIGA Code of Practice
Doc. 30/10 “Disposal of gases””, available on http://www.eiga.org
Refer to the manufacturer's gas recovery program.
Make sure that the emission limits stated in local standards or
indicated
in the authorisations have not been exceeded.
List of hazardous waste: 14 06 01: chlorofluorocarbons, HCFC,
HFC.
Additional
information
None

EN//0915/WLA Compact/15
REFRIGERANT SAFETY DATA
14. INFORMATION ON
TRANSPORT
Number UN 3159
Suitable shipment
name
Non-flammable, non-toxic gas
Class 2 (ADR, ADNR, RID); 2.2 (IATA, IMDG)
Classification code 2A (ADR, ADNR, RID)
Hazard identification
number
20 (ADR, ADNR, RID)
Label 2.2
EmS Number
(IMDG)
F-C, S-V
Marine Pollutant
(IMDG)
No
15. REGULATORY
INFORMATION
Specific laws
and regulations
concerning
safety, health and
environment for the
substance or mixture
EU Legislation
Use restrictions None
Seveso Directive 96/82 /
EC
Not included
National Legislation
National Legislation Comply with all national and
regional standards
Chemical Safety
Assessment
This product has undergone a Chemical safety assessment

EN/0915/WLA Compact/16
2.5. Labels
Label recalling the instruction manual.
Position: on the side of the electrical panel.
Tank discharge
Position: close to the draining
valves of the evaporators and
storage tank (where available).
Chiller hydraulic circuit inlet
(chiller water return)
Position: close to the hydraulic
circuit inlet connection.
Chiller hydraulic circuit outlet
(chiller water supply)
Position: close to the hydraulic
circuit outlet connection.
Hot components
Position: close to condenser inlet/outlet pipes (under the protection guard) and
on the compressor support. With antifreeze option, they can be found close to the
heaters around the evaporator, at the pump volute, steel hydraulic pipes and in the
storage tank.
High voltage
Position: close to electric components and in the electrical panel.
Motor rotation direction
Position: close to the fan and pumps
Tank filling
Position: close to the filling
valves of the storage tank
(where available).

400-460V/3/50-60Hz
40,5 bar
85 °C
60/20,9 A
2300 W (W15L32)
45 °C
1,2 kg
82 kg
Tensione nominale - Rated voltage -
Nennspannung - Tension nominale
PS HP (Max pressione ammissibile HP - Max allowable pressure
HP - Max zulässiger Druck HP - Pression maximum admise HP)
TS MAX (Refrigerante - Refrigerant - Kaltemittel - Refrigerant)
Avviamento/marcia - Starting/run current -
Anlaufstrom/Nennstrom - Démarrage/marche
Resa nom. - Cooling cap. - Kalteleistung -
Puissance nominale
Potenza Assorbita - Input power - Leistungsaufnahme -
Puissance absorbée
TSS (Max temp. Di stoccaggio - Max Storage temp. - Max
Lagertemperatur - Temp. Max d'emmagasinage)
Carica gas - Filling capacity - Fullmenge - Charge de gaz
Refrigerante tipo - Refrigerant type - Kaltemittel - Refrigerant type
Peso - Weight - Gewicht - Poids
640 W (W15L32)
Contiene gas fluorurati ad effetto serra disciplinati dal protocollo di Kyoto - Device
containing HFC fluids causing greenhouse effect regulated by Kyoto protocol - Das Gerät
erhält wie vom Kyoto-Protokoll geregelte Fluorkohlenwasserstoffe Treibhausgasen -
Dispositif contenant fluides HFC à effet de serre disciplinés par le protocole de Kyoto
REFRIGERATORE DI LIQUIDO - LIQUID COOLER -
KUHLANLAGE - REFROIDISSEUR DE LIQUIDE
SERIE - SERIES - SERIE - SERIE
DATA - DATE - DATUM - DATE
WLA2240020000 7035
N°0000000001
29/01/14
MODELLO - MODEL - TYP - MODELE
MADE IN ITALY
ORDINE - ORDER - ORDER - COMMANDER 0000000000
-10 °C
TS MIN (Refrigerante - Refrigerant - Kaltemittel - Refrigerant)
15 bar
PS LP (Max pressione ammissibile LP - Max allowable pressure
LP - Max zulässiger Druck LP - Pression maximum admise LP)
CAT PED
Modulo valutazione - Evaluation Module - Bewertungsverfahren -
Procédure d'évaluation A1
0035
I
R134a
EN//0915/WLA Compact/17
The chiller is identified with a data plate shown on
the side.
The data plate also indicates the unit serial
number, which is essential to obtain support or
information on the unit described in this manual.
Position: under the electrical panel.

EN/0915/WLA Compact/18
2.6. Intended and unintended use
Intended use
The chillers described in this manual are intended to cool water or mixtures of water and glycol, generally used as
refrigerant in production processes.
The operation safety of the system is guaranteed as long as it complies with its intended use. The storage and
operation limit values indicated on the data plate and stated in paragraph 5.1 must NEVER be exceeded.
STULZ is not liable for damage caused by improper use. The operator is fully responsible for this risk.
Unintended use
The use of the chiller must ALWAYS comply with the standards in force and instructions provided in this manual.
Moreover, its use is prohibited in the event it is installed:
• incorrectly;
• on mobile parts or on oscillating, inclined (not levelled) supports or on supports that transmit vibrations;
• in areas with high heat radiation;
• in areas with strong magnetic fields;
• in areas with open flames;
• in areas featuring explosive atmospheres;
• in the presence of flammable products;
• in areas with risk of explosion;
• in areas with saline atmosphere;
• in areas with aggressive atmospheres;
• in areas excessively dusty;
• in the presence of materials that may obstruct the air circuit after being deposited or suctioned by the chiller.
Moreover, its use is prohibited after any modification or transformation applied but not approved by STULZ, including
the use of non-original spare parts.

EN//0915/WLA Compact/19
3. Coding
The code indicates every variant of the chiller and it is indicated on the chiller data plate (see page 17).
The following table summarises all the possible code digit values. Some combinations of these values are non-
available codes.
20421AL W 00000
1° 2° 3° 4° 5° 6° 7° 9°
0
8° 10° 11° 12° 13° 14°
AAir cooled
LPrecision laser +/-1K
Version
Cooling capacity
Hydraulic conguration
12 1200 W (1) 23 2300 W (1)
15 1500 W (1) 30 2800 W (1)
22 2200 W (1) 34 3400 W (1)
(1) a 50 Hz, W15L32 44 4400 W (1)
Liquid chiller
10 heat exchanger only
20 heat exchanger + standard pump
30 heat exchanger + medium pressure pump
40 heat exchanger + tank + standard pump
50 heat exchanger + tank + medium pressure pump
0standard
1on/off system
2modulation system
Condensation pressure regulation
00 230 V / 1~ / 50 Hz
20 230 V / 1~ / 50 Hz - 230 V / 1~ / 60 Hz
61 400 V / 3~ / 50 Hz - 460 V / 3~ / 60 Hz
Power supply
0no filter, standard frame
1polyurethane air filter with aluminium mesh
2no filter, stainless steel frame
3polyurethane air filter with stainless steel mesh
Air lter
Optional

EN/0915/WLA Compact/20
4. Description
4.1. Layout of the components, principle and mode operation.
Only chiller
The chillers described in this manual consist of:
• hermetic refrigerant circuit, filled with R134a refrigerant. The refrigerant circuit includes a rotary vane
compressor, condenser, an electronic thermostatic valve, and stainless steel evaporator as brazed plate heat
exchanger;
• hydraulic circuit;
• condensation module consisting of a condenser and a fan.
The chiller is controlled from the Dixell XW05K electronic regulator (designed and produced according to STULZ
specification) and from a main switch placed on the side of the electronic regulator on the chiller front panel. The
electrical panel, with protection rate IP44, can be accessed from the upper part of the unit and contains all the
electrical control components of the chiller already wired. The holes for the passage of power supply cables are
located on the rear side of the unit and are provided with cable gland sheaths.
The compressor is fixed to the base and it is found in the left rear side of the chiller (accessible by removing the left
side panel).
The condenser, with intake fan integrated, is located in the left side of the chiller and it can be accessed from the left
panel and from the front side, prior removal of the specific panels.
The evaporator as brazed plate heat exchanger is placed at the centre of the unit and it can be accessed by
removing the front panel.
The condenser cooling air is suctioned from the front side and discharged on the rear upwards by means of the
specific grid in the closing panels.
The inlet and outlet water fittings are located on the rear right, whereas additional hydronic components (circulation
pump and storage tank) are found on the chiller right side.
4.2. Refrigerant diagrams
Key
Name, symbol Meaning Name, symbol Meaning
BC Condenser MT Electric motor
CO Compressor PP Capacity control pressure switch
EV Evaporator PV Fan capacity control
FA Condenser air filter S Temperature probe
FG Refrigerant filter SC1/SC2 Electronic controller
HP High pressure switch SG Solenoid valve
LD Gas injector VT Thermostatic valve