Westric DW Series User manual

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Table of Contents
Description Page
Cover 1
Table of contents 2
Type identification 3
Field of application 4
General features 4
Control Panel 5
Dimensions of indoor unit - Top air outlet 6
Dimensions of indoor unit - Bottom air outlet 6
Dimensions of Outdoors unit DW - 008-DW - 010 7
Dimensions of Outdoors unit DW - 012 8
Technical data sheet 10
Installation and Assembly 14
Checking of equipment upon receipt 14
Electrical connections 14
Recommended electrical data of wire sections 15
Missing phase, under- and overvoltage sensors 16
485 Communication 17
Maximum distances and diameters of copper tubing 18
Maintenance 21 – 22
Carel Controller - Operation Manual 23 – 29
Humidifier failures 30 – 31
Auto – Manual 32
Communication modes 33 – 35
Carel Humidifier - Operation Manual 36 – 39
Blind interconnection 40 – 41
Troubleshooting Guide 42
Electric Circuits 43 – 48

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Field of application
Air conditioning equipment for telephone exchange centers, computer centers, laboratories, etc. requiring a high
degree of reliability.
DW Series WESTRIC Precision Air Conditioners have been developed to fully comply with these requirements and
ensure a highly reliable operation.
Their purpose is to control the temperature and humidity of rooms throughout the year, and make the decisions
required to maintain the programmed conditions at all times.
General features
DW units are manufactured using galvanized, pre-painted steel sheets, ensuring a long service life of the cabinet
housing without the need of repainting or other maintenance procedures.
To enable its cooling operation under low outdoor temperatures, WESTRIC air conditioners with air-cooled
condensation are equipped with electronically-controlled modulating condensation, allowing complete control of the
operating conditions.
The evaporator section has a large coil and a high air flow which ensure high performance under sensible heat.
The heating batteries mounted in the evaporator section accelerate the dehumidifying process by reheating the air.
Electrical resistors are also used in case environmental conditions require them to provide heating.
Stainless steel drip tray. Used for collecting condensate.
Scroll compressor. This is a high-efficiency compressor provided with a thermal relay, which protects it against
abnormal increase of power consumption or temperature.
Electronic Condensation Control (CVTR). This device allows the unit to operate under low outdoor
temperature. A pressure or temperature sensor controls gas conditions in the condenser coil, and allows the
electronic system to change the condenser blower speed.
Line Filter. A molecular filter is installed in the liquid line filter to ensure the constant filtration and dehydrating
of circulating coolant.
Air Filters. 30/30 medium-efficiency filters ensuring the cleanliness of air circulating through the evaporator.
Service Valves. These valves are located in the suction and liquid lines to control the pressure, charge or
discharge of cooling gas, etc.
Electric Motors. Electric motors are designed to provide continuous, trouble-free operation and are equipped
with shielded ball-bearings.
High-Pressure Switch. This switch will operate when condenser pressure reaches high values.
Low-Pressure Switch. This switch will operate when the evaporator pressure falls below a certain value as a
result of lack of gas or due to some other abnormality; its replacement is automatic.
Clogged-Filter Switch This device will operate when dirt accumulated on the filter reduces air flow. This signal
is transmitted to the Controller in order to switch off the unit and replace it by the back-up unit.
Air-Flow Switch. This switch monitors that there is an adequate air flow in the evaporator as a condition for the
compressor or the resistances to be enabled.
Klixon Thermal Protections. This thermal protector will disconnect the heating system in case of blower motor
failure. Each set of resistors has its own independent protection.
Electric resistance for heating and/or dehumidification Their electrical output is practically equivalent to the
one of the compressor, so that power consumption during cooling or heating operations is the same.

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Thermostatic Expansion Valve. This valve is located in the liquid line upstream the evaporator. It regulates the
amount of coolant injected into the evaporator, regardless of its the load condition. The type used in Westric
Precision equipment includes an overheat bulb sensor and external equalizer.
Viewing Glass This is a transparent tube through which one can control the gas load and observe the
presence of moisture in the circuit.
Control Panel
The units are controlled by a built-in panel. The panel houses the controller, which is connected to other units via
interconnection terminals.
Therefore, the operation of the unit is entirely automatic.
The controller has a Flash memory which records the operating program and it also has multiple inputs and
outputs. The unit receives data from sensors and controls different elements of the system.
Using the display and keypad built into the controller makes it possible not only to obtain data about the conditions
in the room, but also the fault data log. Using an access code or password the user can enter the menu to change
temperature or humidity set points, cycling parameters, etc.
The control panel is able to receive the signal from a potential-free contact from a fire control room; this signal is
used to switch off the units in case the fire alarm is triggered.
Main elements of unit panel:
Modular terminals for power supply and alarm outputs
Contactors for each load with 24V coil
Microprocessed controller
Smoke detector (Optional)
Power factor correction capacitors (Cos Phi)
General thermo-magnetic circuit breaker
Over current relay for motor and compressor contactors
Abnormal power supply sensor
Relative Humidity Sensor
Temperature Sensor
Auto-Manual System
Terminals. Terminals allow connecting the panel to the elements of the unit and to the power supply input.
Contactors. Each element of the system is controlled by the Controller through a contactor with a 24V coil.
Controller. Each system is controlled by a dedicated controller for air conditioners. The controller received
information about room conditions and possible malfunctions.
Smoke Detector (Optional) This device detects the presence of smoke in the room.
Power Factor.The power factor (cos phi) of the system load is corrected by means of power capacitors in
order to keep it within the values requested by power supply companies.
General thermo-magnetic circuit breaker. All units have a general thermo-magnetic circuit breaker in their
internal board to protect it and also to allow for personnel safety during maintenance and service operations.
Over current relays. These relays detect over current conditions in blower and compressor motors.
Controller alarm outputs. The system has alarm outputs which are triggered when one or more units are out
of service.
Abnormal power supply sensor. This sensor is used to detect under- or overvoltage conditions, missing
phase or phase asymmetry.
Humidity sensor. This sensor sends analog information to the Controller about changes in room humidity.
Temperature sensor. This sensor sends information to the Controller about changes in room temperature.
This sensor is located away from the controller.
Manual system. This system allows units to be operated in refrigeration mode in case controller suffers any
damage. Its operation is totally independent from the controller. Room temperature is controlled by a
mechanical thermostat set at 23°C.

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Dimensions of Indoor Units – Top Air Outlet

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Dimensions of Indoor Units – Bottom Air Outlet – Front Return

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Dimensions of DW-008-UE/ DW-010-UE Outdoor Unit

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Dimensions of DW-012 UE Outdoor Unit

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Technical Data Sheet - Top or Bottom Air Discharge - Front, Back, Top or Bottom Air Return
DESCRIPTION UNIT DW - 003 UI / UE DW - 005 UI / UE
CHARACTERISTICS OF DIRECT EXPANSION UNIT
CAPACITY MEASURED FOR 23ºC BS / 50% HR INT - 35ºC BC EXTERIOR
TYPE - VERTICAL
BRAND NAME - WESTRIC
MANUFACTURING STANDARD - ISO-9001
ORIGIN Country ARGENTINA
CAPACITY Kwf 10.1 17
SENSIBLE CAPACITY Kwf 8.9 15
POWER DEMAND Kw 5.2 7.3
FLOW RATE with 14 mm Col H2O m3/min 58 72
EVAPORATOR WIDTH mm 1200
EVAPORATOR HIGH mm 1950
EVAPORADOR DEPTH mm 750
PLENUM AIR DISCHARGE HIGH mm 300
EVAPORATOR UNIT WEIGHT Kg 230 (*) / 300 (**)
CONDENSER WIDTH mm 1170 1170
CONDENSER HIGH mm 745 745
CONDENSER DEPTH mm 420 420
CONDENSER UNIT WEIGHT Kg 65 (*) / 100 (**) 75 (*) / 130 (**)
(*) UNIT WEIGHT WITHOUT COMPRESSOR - (**) UNIT WEIGHT WITH COMPRESSOR
COMPRESSOR CHARACTERISTICS
TYPE - HERMETICALLY SEALED
QUANTITY No. 1
CAPACITY Kwf 12.2 19
POWER DEMAND Kw 3.2 5.2
CURRENT Amp. 6.5 9.9
START UP Amp. 41 56
CHARGE OF R-410 A GAS Kg 3.6 4,650
EVAPORATOR BLOWER CHARACTERISTICS
TYPE - CENTRIFUGAL
DIAMETER mm 273 273
WIDTH mm 146 146
QUANTITY No. 2
COUPLING - DIRECT
EVAPORATOR BLOWER MOTOR CHARACTERISTICS
POWER DEMAND Kw 0.8 1.4
CURRENT Amp. 3.6 7
VOLTAGE Volt 220
TRANSMISSION - DIRECT
BEARINGS - YES
CONDENSER BLOWER CHARACTERISTICS
TYPE - AXIAL
DIAMETER - 508
QUANTITY No 1
FLOW RATE m3/min 65
COUPLING - DIRECT

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CONDENSER BLOWER MOTOR CHARACTERISTICS
POWER DEMAND Kw 0.56 0.56
CURRENT Amp. 2.7 2.7
VOLTAGE Volt 220
TRANSMISSION - DIRECT
BEARINGS - YES
EVAPORATOR COIL
SURFACE AREA m20.6
NUMBER OF ROWS No. 3 4
TUBE DIAMETER mm 9.52
FINS PER INCH No. 12
CONDENSER COIL
SURFACE AREA m20.55 0.88
NUMBER OF ROWS N2
TUBE DIAMETER mm 9.52
FINS PER INCH No. 13
SYSTEM FOR LOW OUTDOOR TEMPERATURE OPERATION
TYPE - ELECTRONIC
BRAND NAME - WESTRIC
MODEL - CVTR
ORIGIN - ARGENTINA
HIGH- AND LOW-PRESSURE SWITCHES
RANGE HIGH Kg/cm220 – 26
LOW Kg/cm22.8 – 1.3
AIR FILTER
MODEL - 30/30
EFFICIENCY % 30
ARRESTANCE % 90
TYPE - Disposable
ELECTRIC BATTERY (OPTIONAL)
STAGES N1
VOLTAGE Volt 380
POWER DEMAND Kw 3.75 6.00
HUMIDIFIER (OPTIONAL)
POWER DEMAND Kw 2.3
BRAND NAME - CAREL
INTELLIGENT CONTROLLER
MODEL - PCO-3
BRAND NAME - CAREL
ORIGIN Country ITALY
ADDITIONAL DATA
DRAIN (inch) 1”
COPPER
TUBING
TUBING TO BE USED WITH COMPRESSOR IN CONDENSER
SUCTION (inch) 3/4” 7/8”
LIQUID (inch) 3/8” 3/8”
TUBING TO BE USED WITH COMPRESSOR IN EVAPORATOR
HIGH GAS (inch) 5/8”
LIQUID (inch) 3/8”

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CONDENSER TRAY MATERIAL STAINLESS STEEL
EXPANSION VALVE YES/NO YES
LIQUID RECEIVER PIPE YES/NO YES
VIEWING GLASS YES/NO YES
SUCTION ACCUMULATOR YES/NO YES
DEHYDRATING FILTER YES/NO YES
CLOGGED-FILTER SWITCH YES/NO YES
AIR-FLOW SWITCH YES/NO YES
LOW LINE SERVICE VALVES YES/NO YES
HIGH LINE SERVICE VALVES YES/NO YES
Humidifier
Water Production Power Demand Power Supply Voltage Number of
Phases Current
3 Kg/h 2.25 Kw 380VAC 3 Ph 3.2 Inom(A)
Types External Static Pressure (mmca)
0 2 4 8 10 12 14 18 20
Air Flow (m3/min) DW-003 77 76 72 70 67 64 58 56 54
DW-005 90 89 84 81 79 78 72 68 65
Specifications subject to change without notice.

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Installation and Assembly
Location: Before you install a new unit, there are a few important things you should take into account.
Select the exact location to install the units.
Leave at least a 500 mm free space between the units, for easy maintenance and service
purposes.
Place rubber gaskets or iso-mode pad type material to support units so to avoid
transmission of noise and vibration.
Check the level unevenness of the surface on which the unit will be installed, which must not
exceed 5 mm, as this will cause problems with the regulation of the doors and it may also
cause the overflow of condensate from the tray.
Checking of equipment upon receipt
Upon receiving the units, carefully inspect them to verify that they were not damaged during transportation and also
that there are not missing parts. Notify the company in writing of any damage that might have been caused during
transportation.
Check that all items supplied with the units are included in the packaging as well as the items needed for
installation.
Bolts, nuts, cables, silicone sealant, etc. (Not provided)
Special supports for lifting. (Not provided)
Power supply connection
Make sure the voltage to be supplied to the unit is the one required for this model, check this using a
voltmeter.
The power supply is made directly to the Main Switch, located in the power board of the unit.
The unit has a neutral terminal separated from the Main Switch.
IMPORTANT:
NOTE: If power supply is three-phase with neutral, it must be identified beyond any doubt; then check the required
380V between phases, and 220VAC between each phase and neutral.
STANDARD COLORS FOR CABLES:
NAME COLOR
"R" Phase Brown
"S" Phase Black
"T" Phase Red
Neutral Light blue
Ground Yellow / Green
For safety reasons, the power board should be grounded through the corresponding ground terminal.

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Electrical data for cables with copper conductors
Sintenax
Admissible current in amperes for cables with copper conductors
Nominal
Cross
Section
B1 & B2 Method Duct
Wall-embedded
Pipe at sight
C Method
Not perforated tray or
solid bottom tray
E Method
Perforated tray
Ladder tray
Two-pole
cable
Three-pole
or
quadripole
cable
Two-pole
cable or two
single-pole
cables
Three-pole
or
quadripole
cable or
three
single-pole
cables
Two-pole
cable
Three-pole
or
quadripole
cable
sq.mm A A AAAA
1.5 14 13 17 15 19 16
2.5 20 17 23 21 26 22
4 26 23 31 28 35 30
6 33 30 40 36 44 37
10 45 40 55 50 61 52
16 60 54 74 66 82 70
25 78 70 97 84 104 88
35 97 86 120 104 129 110
50 - 103 146 125 157 133
70 - 130 185 160 202 170
95 - 156 224 194 245 207
120 - 179 260 225 285 240
150 - - 299 260 330 278
185 - - 341 297 378 317
240 - - 401 350 447 374
300 - - 461 403 516 432

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Missing phase, under- or over-voltage sensor
This feature protects the unit from missing phase or phase asymmetry. It also protects the
unit from too high or too low voltage electrical supply.
The green light U indicates normal power supply.
Green light Uand yellow light Rindicate normal power supply, phase symmetry and
normal voltage value on all phases.
Otherwise the following could happen:
1. The U light is not On, which indicates that no power is supplied to the main switch or
that it is Off. In this case raise the switch and check the main supply of the unit.
2. The Rlight is not On, which indicates that input power to the unit is not symmetrical.
Place the phases (3 x 380) in symmetry (R - S - T), reversing two phase inputs to
the main switch. If upon reversing both phases the power supply is not enabled, you
will have to check for 220V between Neutral and the three phases, otherwise you
must identify Neutral, (which cannot be mixed between phases) and set the phases
in SYMMETRY. Then the protector will turn on the R light.
3. The U light remains Off and the following lights may be turned on:
>U = Over Voltage (The power company livered higher voltage than normal, wait until voltage is back to
normal)
<U = Under Voltage (The power company delivered lower voltage than normal, wait until voltage is back to
normal)
P = Missing Phase (The power company did not deliver power on one phase. In this case call the power
company and ask them to solve the problem).

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Connection between master and slave/s
Connection between master and slave or slaves is used to transfer data between PLCs. The communication type
is RS485, which will require to connect a Standard RS485 communication cable. Such cable has two poles, wire
braid and screen. The cable must not run together with other cables along the same pipes or trays. It should also
be avoided the vicinity with high-voltage or high-current sources, as well as fluorescent light lamps, or any other
source of electromagnetic induction.
Interconnection diagram:

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Maximum distances between evaporator and condenser (Indoor compressor unit)
WESTRIC Split Systems
Compressor
capacity (TR:
Tons of
refrigeration)
Maximum
length Recommended diameters according to tube length (indoor compressor)
1-5 meters 1-10 meters 1-15 meters 1-20 meters 1-35 meters
Vert. Total Líq. Gas Líq. Gas Líq. Gas Líq. Gas Líq. Gas
1 TR 10 15 1/4” 3/8” 1/4” 3/8” 5/16” 1/2” - - - -
2 TR 10 20 3/8” 1/2” 3/8” 1/2” 3/8” 5/8” 3/8” 5/8” - -
3 TR 15 20 3/8” 1/2” 3/8” 1/2” 1/2” 5/8” 1/2” 5/8” - -
5 TR 25 35 3/8” 5/8” 3/8” 5/8” 1/2” 5/8” 1/2” 5/8” 1/2” 3/4”
7 TR 25 35 1/2” 5/8” 1/2” 5/8” 1/2” 5/8” 1/2” 3/4” 1/2” 3/4”
8 TR 25 35 5/8” 3/4” 5/8” 3/4” 5/8” 3/4” 5/8” 7/8” 5/8” 7/8”
10 TR 25 35 5/8” 7/8” 5/8” 7/8” 5/8” 1” 5/8” 1” 3/4” 11/8”
12 TR 25 35 5/8” 7/8” 5/8” 1” 5/8” 1” 3/4” 11/8” 3/4” 11/8”
15 TR 25 35 3/4” 11/8” 3/4” 11/8” 3/4” 11/8” 3/4” 11/4” 3/4” 1 1/4”
Yield Loss 0 % 1 % 3 % 4 % 5 %
Maximum distances between evaporator and condenser (Outdoor compressor unit)
WESTRIC Split Systems
Compressor
capacity (TR:
Tons of
refrigeration)
Maximum
length Recommended diameters according to tube length (outdoor compressor)
1-5 meters 1-10 meters 1-15 meters 1-20 meters 1-30 meters
Vert. Total Líq. Suct. Líq. Suct. Líq. Suct. Líq. Suct. Líq. Suct.
1 TR 6 15 1/4” 1/2” 1/4” 1/2” 5/16” 5/8” - - - -
2 TR 6 20 3/8” 5/8” 3/8” 5/8” 3/8” 3/4” 3/8” 3/4” - -
3 TR 9 20 3/8” 5/8” 3/8” 3/4” 1/2” 3/4” 1/2” 3/4” - -
5 TR 9 30 3/8” 7/8” 3/8” 7/8” 1/2” 7/8” 1/2” 1” 1/2” 1”
7 TR 9 30 1/2” 1” 1/2” 1” 1/2” 1” 1/2” 1” 5/8” 1 1/8”
8 TR 9 30 5/8” 1 1/8” 5/8” 1 1/8” 5/8” 1 1/8” 5/8” 1 1/8” 5/8” 1 1/4”
10 TR 9 30 5/8” 1 1/4” 5/8” 1 1/4” 5/8” 1 1/4” 5/8” 1 3/8” 5/8” 1 3/8”
12 TR 9 30 5/8” 1 1/4” 5/8” 1 1/4” 5/8” 1 1/4” 3/4” 1 3/8” 3/4” 1 1/2”
15 TR 9 30 3/4” 1 1/2” 3/4” 1 1/2” 3/4” 1 1/2” 7/8” 1 5/8” 7/8” 1 5/8”
Yield Loss 0 % 2 % 4 % 6 % 8 %
For 15 TR units with 2 compressors take data from 8 TR multiplied by 2. For 20 TR with 2 compressors, take data
from 10 TR multiplied by 2.
For 25 TR units with 2 compressors take data from 12 TR multiplied by 2. For 30 TR with 2 compressors, take data
from 15 TR multiplied by 2.
If compressor is mounted up to 6 m above the evaporator, an oil trap is required at the beginning of the line
towards the condenser.
When the compressor is mounted 6 m above, an oil trap must be install every 4 m approx. between each one. The
total number of oil traps must not exceed 9 m.
When heights are greater than 9 m, an oil separator must be installed between the compressor and the condenser
coil to prevent discharge of oil into the circuit, which will not be able to return to the compressor due to the great
difference in height.
When the compressor is installed below the remote condenser, check whether in the compressor compartment,
according to the unit model, the high-pressure gas pipe forms an oil trap, otherwise install one at the compartment
outlet, to accumulate the oil remaining in the vertical path, at the compressor outlet.
Thus, if oil accumulates when the unit is switched off, it will not return to the compressor head and damage will be
prevented.
Install a liquid trap in the outdoor remote condenser with at least half the height of the condenser to prevent that
liquid remaining in the coil drains due to the differece in level.

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Important: When installing the tubing on the walls, cover pipe ends to prevent debris getting into them. Cooling
pipes must be free from grease and oil. During welding it is advisable to circulate nitrogen gently to avoid slag
formed by oxidation of the torch getting into the tubes.
If tubes run through very hot areas, near boilers etc., insulate both tubes.
After welding, use service valves to let nitrogen circulate with good flow rate through the tubes, in order to clean
them thoroughly, and remove remaining any moisture from the walls.
Once the interconnection has been completed, pull vacuum from the tubes and/or the evaporator if there are no
service valves in it, and charge with cooling gas applying high and low pressure.
If for any reason you can pull vacuum only from a single tube and also the evaporator, you need to heat the bulb of
the expansion valve, open it by hand and pull vacuum from the whole system.
After completion of interconnection and running the unit for a few hours, check through the viewing glass that oil
level is normal. If it is not, add oil as required.
Our units are fully charged at the factory. Installation with tube lengths of up to 5 meters require no additional gas.
Additional cooling gas charge (per meter of tube in liquid line):
Additional cooling gas for liquid lines of over 5 meters long
Liquid line diameter For each additional meter of line
1/4” add 8.5 g x meter
3/8” add 17.3 g x meter
1/2” add 33.6 g x meter
5/8” add 53.2 g x meter
3/4” add 78.2 g x meter
7/8” add 108.5 g x meter
NOTE: Once the installation of the system has been completed and after ½ hour of operation, check pressures and
charge of the unit, let high pressure reach 300 lbs, by partially covering the condenser coil, and check that low
pressure is in the range of 65 to 75 lbs approximately. Also check that compressor power consumption complies
with rated value per the catalog.