Mitsubishi Electric t-NEXT DF DX 011 P1 S User manual

The picture of the unit is indicative and may vary depending on the model
•PERIMETER INSTALLATION
•FULLY HERMETIC ON/OFF COMPRESSORS
•DUAL FLUID SYSTEM WITH ADDITIONAL COIL
•SINGLE OR DOUBLE REFRIGERANT CIRCUIT
•AIR DELIVERY FROM THE BOTTOM (UNDER) OR FROM THE TOP (OVER)
•PLUG FANS WITH EC ELECTRIC MOTOR
•ELECTRONIC EXPANSION VALVE
•AIR SUCTION TEMPERATURE UP TO 40°C
t-NEXT DF DX
10 –149 kW
Air conditioners for IT Cooling with Dual Fluid system.
To be matched with remote air-cooled condenser.
Data Book: T_tNEXTDFDX_0719_EN
CLOSE CONTROL AIR CONDITIONERS
rcitcooling.com

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INDEX
MEHITS CERTIFICATIONS...........................................................................................................................................................................................................4
GENERAL CHARACTERISTICS ...................................................................................................................................................................................................5
INSTALLATION..............................................................................................................................................................................................................................6
PRODUCT FEATURES AND BENEFITS ......................................................................................................................................................................................6
F-GAS DIRECTIVE ........................................................................................................................................................................................................................6
MODEL IDENTIFICATION .............................................................................................................................................................................................................7
TRANSPORT AND STORAGE TEMPERATURE..........................................................................................................................................................................7
WORKING LIMITS .........................................................................................................................................................................................................................8
MAIN COMPONENTS....................................................................................................................................................................................................................9
REMOTE AIR-COOLED CONDENSERS ....................................................................................................................................................................................11
OPTIONAL ACCESSORIES ........................................................................................................................................................................................................11
TECHNICAL DATA ......................................................................................................................................................................................................................14
DUAL FLUID SYSTEM.................................................................................................................................................................................................................18
2-WAY BALL VALVE FOR CHILLED WATER FLOW CONTROL ..............................................................................................................................................19
WATER QUALITY OF THE HYDRAULIC CIRCUITS..................................................................................................................................................................20
ANTIFREEZE MIXTURES ...........................................................................................................................................................................................................20
REFRIGERANT CHARGE ...........................................................................................................................................................................................................21
PRESSURE RELIEF VALVE .......................................................................................................................................................................................................22
REFRIGERANT CIRCUIT ............................................................................................................................................................................................................23
RECOMMENDED REFRIGERANT LINES ..................................................................................................................................................................................25
INSTALLATION DIAGRAM ..........................................................................................................................................................................................................26
ACOUSTIC DATA ........................................................................................................................................................................................................................27
ELECTRICAL DATA.....................................................................................................................................................................................................................28
MICROPROCESSOR CONTROL SYSTEM................................................................................................................................................................................29
DEMAND LIMIT............................................................................................................................................................................................................................31
TEMPERATURE PROBE ON AIR RETURN / DELIVERY ..........................................................................................................................................................31
CLOGGED FILTERS SENSOR ...................................................................................................................................................................................................31
FLOOD SENSOR.........................................................................................................................................................................................................................31
POSSIBLE AIR INTAKE FOR OVER VERSIONS .......................................................................................................................................................................32
REMOTE AIR-COOLED CONDENSER.......................................................................................................................................................................................33
OPTIONAL ACCESSORIES: P121 –FRONT AIR INTAKE+BOTTOM PANEL..........................................................................................................................35
OPTIONAL ACCESSORIES: 601 –SOLENOID VALVE ON LIQUID LINE ................................................................................................................................35
OPTIONAL ACCESSORIES: A548 - CONSTANT PREVALENCE .............................................................................................................................................35
OPTIONAL ACCESSORIES: P091 - BACK-UP MODULE CONTROLLER ................................................................................................................................35
OPTIONAL ACCESSORIES: P171 –KIT FOR AIR -45°C MCH AXIAL AC ...............................................................................................................................36
OPTIONAL ACCESSORIES: P172 –KIT FOR AIR -45°C AXIAL AC ........................................................................................................................................36
OPTIONAL ACCESSORIES: A492 –WATER LEACKAGE DETECTOR + ADDITIONAL DETECTOR.....................................................................................37
OPTIONAL ACCESSORIES: A511 - SMOKE DETECTORS ......................................................................................................................................................37
OPTIONAL ACCESSORIES: A512 –FIRE DETECTORS ..........................................................................................................................................................37
ACCESSORI: P181 –ANALIZZATORE DI RETE .......................................................................................................................................................................38
ACCESSORI: P182 –ANALIZZATORE DI RETE+OPTIONAL...................................................................................................................................................38
ACCESSORI: P183 –KIT ANALIZZATORE DI RETE.................................................................................................................................................................38
ACCESSORI: P184 –KIT ANALIZZATORE DI RETE+ OPTIONAL ...........................................................................................................................................38
OPTIONAL ACCESSORIES: P021 –2-WAY BALL BY-PASS VALVE .......................................................................................................................................39
OPTIONAL ACCESSORIES: A431 –ELECTRIC HEATERS......................................................................................................................................................41
OPTIONAL ACCESSORIES: A432 –EXTRA POWER ELECTRIC HEATERS ..........................................................................................................................41
OPTIONAL ACCESSORIES: 4301 –STEAM HUMIDIFIER 3KG/H............................................................................................................................................43
OPTIONAL ACCESSORIES: 4303 –STEAM HUMIDIFIER 8KG/H............................................................................................................................................43
OPTIONAL ACCESSORIES: 4305 –STEAM HUMIDIFIER 15KG/H..........................................................................................................................................43
OPTIONAL ACCESSORIES : P051 –DEHUMIDIFICATION FUNCTION ..................................................................................................................................46
OPTIONAL ACCESSORIES: P161 - T/RH AIR INTAKE SENSOR.............................................................................................................................................46

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OPTIONAL ACCESSORIES: P071 - REMOTE T/RH PROBE....................................................................................................................................................46
OPTIONAL ACCESSORIES: 4666 –EXTERNAL AIR PROBE ..................................................................................................................................................46
OPTIONAL ACCESSORIES: P111 –DUAL POWER SUPPLY ..................................................................................................................................................47
OPTIONAL ACCESSORIES: P112 –DUAL POWER SUPPLY + OPTIONAL............................................................................................................................47
OPTIONAL ACCESSORIES: P113 –KIT DUAL POWER SUPPLY ...........................................................................................................................................47
OPTIONAL ACCESSORIES: P114 –KIT DUAL POWER SUPPLY + OPTIONAL .....................................................................................................................47
OPTIONAL ACCESSORIES: A381 - DRAIN PUMP....................................................................................................................................................................48
OPTIONAL ACCESSORIES: P084 –AIR FILTER EPM10 50% ..................................................................................................................................................49
OPTIONAL ACCESSORIES: A531 –ON-OFF DAMPER ...........................................................................................................................................................50
OPTIONAL ACCESSORIES: P011 - EMPTY PLENUM..............................................................................................................................................................52
OPTIONAL ACCESSORIES: P012 - EMPTY PLENUM CL.A1...................................................................................................................................................52
OPTIONAL ACCESSORIES: P031 - EMPTY INTAKE PLENUM................................................................................................................................................52
OPTIONAL ACCESSORIES: P032 - EMPTY INTAKE PLENUM CL.A1.....................................................................................................................................52
OPTIONAL ACCESSORIES: P013 - PLENUM + 3 GRILLES .....................................................................................................................................................52
OPTIONAL ACCESSORIES: P014 - PLENUM + 3 GRILLES CL.A1..........................................................................................................................................52
OPTIONAL ACCESSORIES: P015 - SILENCED PLENUM ........................................................................................................................................................52
OPTIONAL ACCESSORIES: P016 - SILENCED PLENUM + 1 GRILLE ....................................................................................................................................52
OPTIONAL ACCESSORIES: P017 - PLENUM + FILTER EPM2.5 50%.....................................................................................................................................52
OPTIONAL ACCESSORIES: P018 - PLENUM + FILTER EPM1 50%........................................................................................................................................52
OPTIONAL ACCESSORIES: P019 - PLENUM + FILTER EPM1 85%........................................................................................................................................52
OPTIONAL ACCESSORIES: P034 –INTAKE FREE-COOLING PLENUM ................................................................................................................................59
OPTIONAL ACCESSORIES: P041 –SUPPORT FRAME H 255-350MM...................................................................................................................................63
OPTIONAL ACCESSORIES: P042 –SUPPORT FRAME H 355-450MM...................................................................................................................................63
OPTIONAL ACCESSORIES: P043 –SUPPORT FRAME H 400-510MM...................................................................................................................................63
OPTIONAL ACCESSORIES: 1511 –SOFT STARTER...............................................................................................................................................................64
OPTIONAL ACCESSORIES: A272 –CL.0 OR A1 (EN13501-1) INSULATION..........................................................................................................................65
MACHINE DRAWINGS ................................................................................................................................................................................................................66
HOLE IN THE RAISED FLOOR FOR DOWNFLOW VERSION ..................................................................................................................................................83
EXAMPLE FOR MACHINES NOISE EMISSION CALCULATION...............................................................................................................................................84
VALVE PRESSURE DROP CALCULATION AS FUNCTION OF WATER FLOW RATE............................................................................................................86
AIR FILTERS REPLACEMENT....................................................................................................................................................................................................87
SHIPMENT: PACKING DIMENSIONS.........................................................................................................................................................................................88
SHIPMENT: SHIPPING WEIGHT ................................................................................................................................................................................................88
SHIPMENT: OPTIONALS PACKING DIMENSIONS AND SHIPPING WEIGHT.........................................................................................................................89

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MEHITS CERTIFICATIONS
SYSTEM CERTIFICATIONS
ISO 9001 CERTIFICATION –MEHITS S.p.A.
Quality Management System
ISO 14001 CERTIFICATION –MEHITS S.p.A.
Environmental Management System
BS OHSAS 18001 CERTIFICATION –MEHITS S.p.A.
Occupational Health and Safety Management System
PRODUCT CERTIFICATIONS BY COUNTRY
CE MARKING
MEHITS units are in compliance with the European Directives in force.
CCC –CQC CERTIFICATION
(People’s Republic of China)
EAC CERTIFICATION
(Russian Federation, Belarus, Kazakhstan)

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GENERAL CHARACTERISTICS
Air Conditioners for IT Cooling with Dual Fluid system.
•Direct expansion, air cooled.
For matching with remote air-cooled condenser;
•Two independent cooling systems:
Direct expansion coil; Chilled water coil;
•Plug fans with EC electric motors;
•Rotary or scroll on/off compressors;
•Single or double refrigerant circuit.
This series is offered in 20 models available in the following versions:
•The upflow version (Over) is characterized by air intake from the front through honeycomb grille
and air delivery from the top of the unit.
•The downflow version (Under) is characterized by air intake from the top and air delivery from
the bottom of the unit.
Cooling capacity: 10 ÷ 149 kW
The machines are made for indoor installation.
The constructive solutions and the internal lay-out allow high application flexibility and the frontal access to
the main components for the inspection and routine maintenance.
The installation requires refrigerant charge, electrical and hydraulic connections.
Final assembly on all machines before shipment including running test, reading and monitoring of operating
parameters, alarms simulation and visual check.
UNDER
Downflow air delivery
OVER
Upflow air delivery
UNDER
Downflow air delivery
OVER
Upflow air delivery
Air conditioner
Remote
condenser
Liquid chiller

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INSTALLATION
The series is particularly suitable for installation in Data Centre of medium / small size with constant load.
DOWNFLOW VERSION (Under)
Typical installation is on the perimeter.
The units are placed along the perimeter of the Data Center. Air suction from the top of the unit and air
delivery in the underfloor void.
The air distribution is achieved by special tiles placed in front of the racks row, forming cold aisle for air
diffusion. On the rear of the racks is expelled the hot then aspirated by the unit.
For an optimal installation is advisable to provide the cold aisle containment.
Some solutions provide a service corridor around the server rooms where to place the units. In this case, it
is necessary to provide the air intake plenum for each unit. With this solution, all the space in the Data
Center is available for the installation of racks.
UPFLOW VERSION (Over)
The type of installation is practically similar to the previous. The only difference is that for the air distribution
in the Data Center is not used the raised floor but ducts in the ceiling.
The series is also suitable for installation in UPS, Batteries, Distribution rooms and in all service areas of
the Data Center that need a service of conditioning.
OPTIONAL
An extensive list of accessories allows the unit to adapt effectively to the real needs of the system, reducing
the time and cost of installation.
PRODUCT FEATURES AND BENEFITS
•Dual Fluid System: Two independent cooling systems: Chilled water coil; Direct expansion coil
•Electronic expansion valve;
•New plug fans with EC electric motors and impeller in composite material, which guarantees a
reduction of power consumption;
•New fans electric motor that do not require maintenance;
•Improvement of the control software with advanced control logic;
•Single or double refrigerant circuit;
•Air suction temperature up to 40°C
F-GAS DIRECTIVE
The units highlighted in this publication contain <HFC R410A [GWP100 2088]> fluorinated
greenhouse gases.

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MODEL IDENTIFICATION
Air conditioners for IT Cooling
model: t-NEXT DF DX O 041 P1 S E4
t-NEXT Series
DF DX Unit type
DF –with dual fluid system
Two independent cooling systems:
Direct expansion coil, chilled water coil,
DX –direct expansion, air cooled
O Air delivery
O = over –upflow air delivery
U = under –downflow air delivery
041 Model / Cooling capacity (kW) at nominal conditions
P1 Compressor type and number
P = scroll compressor for R410A
1 = number of compressors
S Refrigerant circuit
S = single
D = double
E4 Size
TRANSPORT AND STORAGE TEMPERATURE
During transport and if the machine is not installed at the reception, do not remove the packaging and place
the machine in an enclosed, dry and protected from sunlight site at temperatures ranging between -30°C
and 50°C in absence of superficial condensation.
THE RANGE
UNDER
OVER

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WORKING LIMITS
ROOM AIR CONDITIONS
Room air temperature:
14°C minimum temperature with wet bulb.
24°C maximum temperature with wet bulb.
18°C minimum temperature with dry bulb
40°C maximum temperature with dry bulb.
AREA “A”. Machine operating envelope.
Room air humidity:
20%RH minimum relative humidity.
60%RH maximum relative humidity.
AMBIENT AIR TEMPERATURE
45°C Maximum ambient air temperature
-20°C Minimum ambient air temperature
With “Kit for air -45°C” for low ambient temperature operation (optional)
-45°C minimum ambient air temperature with remote condensers with AC fans
CHILLED WATER TEMPERATURE (Dual Fluid circuit)
6-25°C temperature range of the water entering the coil
ΔT 3°C Minimum temperature difference between water inlet and outlet
ΔT 10°C Maximum temperature difference between water inlet and outlet
All the values are indicative. The working temperatures are influenced by a series of variables as:
•Working conditions;
•Thermal load;
•Set of the microprocessor control.
HYDRAULIC CIRCUIT (Dual Fluid circuit)
ΔP 5-150kPa Pressure drop range of the hydraulic circuit.
10 Bar Maximum working pressure of the hydraulic circuit
POWER SUPPLY
± 10% Maximum tolerance of the supply voltage (V)
± 2% Maximum unbalancing of the phases.
A
Relative humidity - %
Relative humidity - %
Dry bulb temperature - °C

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MAIN COMPONENTS
FRAMEWORK
•Base in aluminium extrusion, painted with epoxy powders. Colour RAL 9005;
•Frame in aluminium profile, painted with epoxy powders. The inner frame is provided with
seals for the panels. Colour RAL 9005;
•Panels in galvanized steel sheet with protective surfaces treatment in compliance with UNI
ISO 9227/ASTMB117 and ISO 7253, and painted with epoxy powders. Colour RAL 7016
hammered;
•Panels insulated with polyurethane foam and seals to ensure air tight.
•Hinged front panels with quick release removal system.
•Total front access for routine maintenance.
•Removable lateral and back side panels.
•Air flow OVER version:
- Air intake from the front through honeycomb type grille and air delivery from the top.
•Air flow UNDER version:
- Air intake from the top and air delivery from the bottom.
•Compartment for electrical panel on unit front for direct access to control and regulation
devices;
FILTER SECTION
•Washable air filters with COARSE 60% efficiency (according to ISO EN 16890), with cells in
synthetic fibre and metallic frame.
•Air filters access:
OVER version
- Frontal access for all machines
UNDER version
- For machines size E1 –E2 –E3 frontal access
- For machine size E4 –E5 –E6 –E7 –E8 –E9 access from upper side
•Clogged filters sensor with differential pressure switch on air side.
ON / OFF COMPRESSORS SECTION
Units size E1 and E2:
•Rotary vane compressors for R410A refrigerant
•2-pole 3-phase electric motor with direct on line starting.
•Crankcase heater.
•Rubber supports.
Units size E3, E4, E5, E6, E7, E8 and E9
•Scroll rotary compressors with spiral profile optimized for R410A refrigerant.
•2-pole 3-phase electric motor with direct on line starting.
•Crankcase heater.
•Rubber supports.
FANS SECTION
The fan section is contained within the machine and includes:
•Centrifugal fans with backward curved blades with wing profile, single suction and without
scroll housings (Plug-fans), directly coupled to external rotor electric motor.
•Impeller in composite material exempt from rust formation.
•Brushless type synchronous EC motor with integrated electronic commutated system and
continuous variation of the rotation speed. The motor rotation control is obtained with the EC
system (Electronic Commutation) that manage the motor according to the signal coming from
the microprocessor control.
•Fans control through ModBus. In case of failure, the control stops the interested fan indicating
the type of fault. The machine with more than one fan is not stopped.
•Adjustable External Static Pressure (ESP).
•Fan guard with rubber support (UNDER version)

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COOLING SECTION –DIRECT EXPANSION COIL
•Heat exchanger coil with internally corrugated copper tubes and high efficiency aluminium
fins, specifically developed to provide high heat transfer and lower pressure drops.
•Frame in galvanized steel or peraluman.
•Condensate tray in peraluman with PVC flexible discharge pipe.
•Temperature sensor on air intake with control and regulation functions.
•Temperature sensor on air delivery with function of temperature display.
•Under floor water alarm through sensor to be placed on the floor.
COOLING SECTION –CHILLED WATER COIL
•Chilled water 4 rows cooling coil with copper tubes, aluminium fins and galvanized steel
frame.
•2-way motorized valve with 0÷10 VDC control actuator and emergency manual control.
•Temperature probe on water inlet.
•Hydraulic pipes in copper with anticondensate insulation
REFRIGERANT CIRCUIT
The air conditioner is supplied with a minimum R410A refrigerant charge.
Components for each refrigerant circuit:
•Electronic expansion valve. The valve allows high performance and system efficiency thanks
to a timely and accurate response to changes in temperature and pressure.
•Sight glass.
•Filter dryer on liquid line.
•Pressure transducers with indication, control and protection functions, on low and high
refrigerant pressure.
•High pressure safety switch with manual reset.
•Liquid receiver.
•Pressure relief valve on liquid receiver for models 041 P1, 045 P1, 075 P2, 082 P2,
092 P2, 102 P2, 117 P4, 146 P4.
•Refrigerant circuit with copper tubing with anticondensate insulation of the suction line.
•Lubricant oil charge.
•Valves on gas delivery and liquid return for coupling to remote air-cooled condenser.
•0÷10V proportional signal to manage the condensing control system of the remote air-cooled
condenser.
•Condensing control by continuous variation of remote condenser fan rotation speed for
operations with ambient temperature down to -20°C.
ELECTRICAL PANEL
In accordance with EN60204-1 norms, suitable for indoor installation, complete with:
•Main switch with door lock safety on frontal panel.
•Magnetothermic switches for each compressor.
•Magnetothermic switches for supply fans.
•Contactors for each load. The supply fans equipped with EC electric motor don’t require
contactors.
•Transformer for auxiliary circuit and microprocessor supply.
•Numbered wirings.
•Terminals:
OUTLETS
- Voltage free deviating contact for General Alarm 1-2
- Voltage free contact for supply fans status.
- Voltage free contact for smoke / fire sensor (the sensors are accessory)
INLETS
- External enabling.
•Power supply 400/3+N/50.
CONTROL SYSTEM
Microprocessor control system with graphic display for control and monitor of operating and alarms
status. The system includes:
•Built-in clock for alarms date and time displaying and storing;
•Built-in memory for the storing of the intervened events (up to 200 events recorded);
•Predisposition for additional connectivity board housing (MODBUS, LON,
BACNET MS/TP RS485, BACNET OVER IP). The electronic cards are optional accessories.
•Main components hour-meter;
•Non-volatile “Flash” memory for data storage in case of power supply faulty;
•Menu with protection password;
•Demand Limit function;
•LAN connection (max 10 units).

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REMOTE AIR-COOLED CONDENSERS
The descriptions of these series can be found in Chapter REMOTE AIR-COOLED CONDENSERS.
............................................Remote air-cooled condenser: Remote air-cooled condenser in
PERALUMAN aluminium alloy with microchannel condensing coil:
P821 - with AC axial fans and standard acoustic version
series GR-Z A B 50;
P831 - with AC axial fans and low noise acoustic version
series GR-Z A L 50;
P841 - with EC axial fans and standard acoustic version
series GR-Z E B 50;
P851 - with EC axial fans and low noise acoustic version
series GR-Z E L 50.
Remote air-cooled condenser with condensing coil with copper tubes and
aluminium fins:
-with AC axial fans series T-MATE DX-A;
-with EC axial fans series T-MATE DX-E;
-with EC plug-fans series T-MATE DX-PF-E.
OPTIONAL ACCESSORIES
The descriptions of these additional components can be found in Chapter OPTIONAL ACCESSORIES.
P121.................................... Front air intake + bottom panel. Unit base noise insulation with special
bottom panel for OVER version. Restriction: Non-compatible with “P122
Bottom air intake + blind panels” for OVER version.
P122.................................... Bottom air intake+blind panels. Blind frontal panel for OVER version. The
accessory allows the intake air from the bottom of the machine. Restriction:
Not compatible with “P121 Front air intake + bottom panel” for OVER
version.
601 ......................................Solenoid valve on liquid line.
A548....................................Constant prevalence. Automatic system for the air pressure control in the
aisle. The system controls the supply fans rotation speed to keep constant
the air pressure via a differential pressure transmitter connected to the
microprocessor control.
P091.................................... Back-up module controller. The system guarantees the microprocessor
power supply for a few minutes, in case of supply voltage failure. (size E1
excluded).
P171.................................... Kit for air -45°C MCH axial AC (condenser series GR). Kit for operations
with low ambient air temperature down to -45°C. For machine start up and
operation with very low ambient air temperatures (between -20°C and -
45°C).
P172 (1) ..............................Kit for air -45°C axial AC (condenser series T-MATE). Kit for operations
with low ambient air temperature down to -45°C. For machine start up and
operation with very low ambient air temperatures (between -20°C and -
45°C).
P191.................................... Power supply for condenser. Electrical power supply for remote
condenser from the indoor machine electrical board. The optional includes
magneto-thermic switches for condenser fans and the control/alarm signals.
383 ......................................Numbered wirings + UK requests;
4181 / 4182 / 4184 / 4185 ...Serial cards:
4181 –Serial card MODBUS;
4182 –Serial card LON;
4184 –Serial card BACNET MS/TP RS485;
4185 –Serial card BACNET OVER IP.
A492....................................Water leakage detector + additional sensor. Supplied in mounting kit.
A511....................................Smoke detector. Supplied in mounting kit.
A521....................................Fire detector. Supplied in mounting kit.
P141.................................... Analogue set-point compensation. - Analogue set point compensation
according to an external analogue signal at Customer care.
The microprocessor control, through the additional module “expansion
card”, can manage a compensation signal of the return air setpoint by
analogue input (0...1V; 0...5V; 0,5...4,5V; 4...20mA; 0...20mA). The
compensation curve allows to assign a temperature setpoint offset
respectively to the minimum and maximum signal managed by the input.

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P181.................................... Network analyser (standard machine) Multifunction utility for calculating and
displaying the machine electrical measurements.
P182.................................... Network analyser+optional (full optional machine) Multifunction utility for
calculating and displaying the machine electrical measurements.
P183.................................... Kit network analyser (standard machine) Multifunction utility for calculating
and displaying the machine electrical measurements. Supplied in mounting
kit.
P184.................................... Kit network analyser+optional (full optional machine) Multifunction utility
for calculating and displaying the machine electrical measurements. Supplied
in mounting kit.
A812 (2) ..............................Free-cooling direct control.
P021.................................... 2 way 0-10V modulating water valve.2-way motorized valve with 0÷10
VDC control actuator and emergency manual control for the third way (by-
pass) of the chilled water hydraulic circuit. The valve is in combination with
the main water flow control valve
A431....................................Electric heater. Heating with electric heaters.
A432....................................Extra power electric heater. Size E1, E2 excluded.
4301 / 4303 / 4305 (3).........Humidification: Modulating steam humidifier with immersed electrodes
with electronic control.
4301 - Steam humidifier 3kg/h
4303 - Steam humidifier 8kg/h
4305 - Steam humidifier 15kg/h
P051 (4) ..............................Dehumidification function.
P161.................................... T/rH air intake sensor. Combined Temperature / Humidity sensor on air
intake. The optional replace the standard temperature sensor on machine
air intake.
4666 ....................................External air probe. External air temperature probe.
P071.................................... Remote T/rH probe. Combined Temperature / Humidity sensor for remote
installation. The optional is added to the standard temperature sensor on
machine air intake.
P111 / P112 / P113 / P114 .Dual power supply.Dual power supply with automatic change-over.
P111 - Dual power supply.
P112 - Dual power supply + optional.
P113 - Dual power supply kit. Supplied in mounting kit
P114 - Dual power supply kit + optional. Supplied in mounting kit
A381....................................Drain pump. Supplied in mounting kit. The system includes pump with
activation float and 10 linear meters long discharge pipe.
P084.................................... Air filter ePM10 50%. Washable high efficiency air filter (according to ISO
EN 16890). Not compatible with “P017 / P018 / P019 Plenum + filter ePM2.5
50%, ePM150%, ePM185% (according to ISO EN 16890)”.
A531 (5) ..............................On-off damper. Non-return air damper with frame driven by electric
servomotor installed on the machine air delivery.
P011.................................... Empty plenum.
P012.................................... Empty plenum CL.A1. Plenum with fire reaction in class “0” or “A1”.
P013.................................... Plenum + 3 grilles on three sides with double adjustable row.
P014.................................... Plenum + 3 grilles CL.A1. Plenum with grilles on three sides with double
adjustable row, with fire reaction in class “0” or “A1”.
P015.................................... Silenced plenum. Not compatible with “P084 Air filter ePM10 50%.”.
P016.................................... Silenced plenum + 1 grille. Grille with double adjustable row on front side
and sound absorbers.
P017.................................... Plenum + filter ePM2,5 50%. Plenum with high efficiency air filter (according
to ISO EN 16890). Not compatible with “P084 Air filter ePM10 50%.”.
P018.................................... Plenum + filter ePM150%. Plenum with high efficiency air filter (according
to ISO EN 16890). Not compatible with “P084 Air filter ePM10 50%.”.
P019.................................... Plenum + filter ePM185%. Plenum with high efficiency air filter (according
to ISO EN 16890). Not compatible with “P084 Air filter ePM10 50%.”.
P031 (6) ..............................Empty intake plenum.
P032 (6) ..............................Empty intake plenum CL.A1. Plenum with fire reaction in class “0” or “A1”.
(size E0 excluded).
P034 (7) ..............................Intake free-cooling plenum.
P041 / P042 / P043.............Support frame with height adjusting rubber holders. Supplied in mounting
kit. It is not possible to match the support frame with plenum installed under
the machine.
P041 –Support frame h 255-350mm
P042 –Support frame h 355-450mm
P043 –Support frame h 400-510mm
3601 ....................................Compressor operating signal contact. Voltage free contact for
compressor status signalling.

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DATA BOOK
2411 ....................................Phase sequence relay. Phases sequence control relay for the machine.
The system checks that the phase sequence of the power supply is correct
to prevent the opposite rotation of the three phase electric motors of the
machine as compressors. The optional is installed in the electrical box
downstream the main switch with door lock safety and in case of wrong
phase sequence prevents starting the machine;
1511 ....................................Soft starter. Compressor motors soft-starter system (size E1, E2
excluded).
3301 ....................................Compressor rephasing. Compressors capacitor for power factor - cosφ
0,9 (sizes E1, E2 excluded).
A181....................................Compressor soundproof jacket. Compressor soundproof jacket for a
sound level reduction of 2 dB(A).
A272....................................CL. 0 or A1 (EN 13501-1) insulation: Panelling with fire reaction in class
“0” or “A1;
P151.................................... Lowered display for Under –for UNDER units equipped with plenum
under the unit.
9973 ....................................Wooden cage packing. The machines are delivered on wooden pallet,
covered with shrink wrap and packaged in wooden cage.
7387012600 ........................Remote terminal. Graphic display for remote installation, the optional is
added to the standard graphic display placed on machine frontal panel.
WARNING
The Manufacturers reserves the right to accept the matching of the optional installed on the
machine.
MANDATORY COMBINATIONS OF ACCESSORIES
1. When optional accessory “P172 Kit for air -45°C axial AC” is present, it requires mandatory
accessory “P191 Power supply for condenser”.
2. When optional accessory “A812 Free cooling direct control” is present, it requires mandatory
accessories “P161 T/rH air intake sensor“ and “4666 External air probe”.
3. When optional accessories “4301 / 4303 / 4305 Steam humidifier” are present, they require
mandatory accessory “P161 T/rH air intake sensor“.
4. When optional accessory “P051 Dehumidification function” is present, it requires mandatory
accessory “P161 T/rH air intake sensor“.
5. When optional accessory “A531 On-off damper” is present, it requires mandatory accessory
“9973 Wooden cage packing”.
6. When optional accessories “P031 Empty intake plenum, for OVER version” and “P032 Empty
intake plenum CL.A1, for OVER version” are present, they require mandatory accessory “P122
Bottom air intake+blind panels, for OVER version only”
7. When optional accessory “P034 Intake free-cooling plenum” is present, it requires mandatory
accessories “P161 T/rH air intake sensor“, “4666 External air probe”, “A812 Free-cooling direct
control” and “P122 Bottom air intake+blind panels, for OVER version only”

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
14
MEHITS S.p.A.
DATA BOOK
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
011 P1 S
014 P1 S
016 P1 S
020 P1 S
022 P1 S
SIZE
E1
E2
E2
E3
E3
COOLING CAPACITY (2)
Total
kW
10,3
13,8
16
20,3
22,1
Sensible
kW
10,2
13,8
14,8
20,3
22,1
SHR (3)
0,99
1
0,92
1
1
Total power input (Comp. + Fans)
kW
2,64
3,27
3,74
4,54
5,5
"EC" SUPPLY FANS
n.
1
1
1
1
1
Air flow
m³/h
2800
4000
4200
5700
6100
Nominal external static pressure
Pa
20
20
20
20
20
Maximum external static pressure
Pa
29
329
276
803
729
Fans power input (4)
kW
0,35
0,5
0,57
0,85
1,04
ON/OFF COMPRESSORS
rotary vane
rotary vane
rotary vane
scroll
scroll
Compressors number
n.
1
1
1
1
1
Capacity steps
n.
1
1
1
1
1
Compressors power input
kW
2,29
2,77
3,16
3,69
4,46
AIR FILTERS
n.
1
1
1
2
2
Filter area
m2
0,61
0,78
0,78
1,24
1,24
Efficiency (ISO EN 16890)
COARSE
60%
60%
60%
60%
60%
REFRIGERANT CIRCUITS
n.
1
1
1
1
1
POWER SUPPLY
V/Ph/Hz
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
ENERGY EFFICIENCY INDEX (2) (5)
EER Energy Efficiency Ratio
kW/kW
3,90
4,22
4,28
4,47
4,02
DIMENSIONS
Length
mm
650
785
785
1085
1085
Width
mm
675
675
675
775
775
Height
mm
1925
1925
1925
1925
1925
NET WEIGHT OVER
kg
248
283
288
333
338
NET WEIGHT UNDER
kg
258
293
298
353
358
REFRIGERANT CONNECTIONS
Gas delivery
ODS Ø
12
16
16
16
16
Liquid return
ODS Ø
12
12
12
16
16
HYDRAULIC CONNECTIONS
CONDENSATE DISCHARGE
Rubber pipe –internal diameter
Ø mm
19
19
19
19
19
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Gross value. Characteristics referred to entering air at 26°C-40%RH; condensing temperature 45°C. ESP=20Pa.
3. SHR = Sensible cooling capacity / Total cooling capacity.
4. Corresponding to the nominal external static pressure
5. The Energy Efficiency Index does not consider the remote air-cooled condenser.
The units highlighted in this publication contain <HFC R410A [GWP100 2088]> fluorinated greenhouse gas

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
15
MEHITS S.p.A.
DATA BOOK
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
026 P1 S
032 P1 S
037 P1 S
041 P1 S
045 P1 S
SIZE
E3
E4
E4
E4
E4
COOLING CAPACITY (2)
Total
kW
26,2
32,5
37,6
41,4
45,4
Sensible
kW
25,3
32,5
37,6
41,2
43,4
SHR (3)
0,97
1
1
1
0,96
Total power input (Comp. + Fans)
kW
6,74
7,62
9,25
10,2
11,2
"EC" SUPPLY FANS
n.
1
1
1
1
1
Air flow
m³/h
6400
8700
10000
10800
10800
Nominal external static pressure
Pa
20
20
20
20
20
Maximum external static pressure
Pa
665
512
175
332
332
Fans power input (4)
kW
1,19
1,42
2,1
2,08
2,08
ON/OFF COMPRESSORS
scroll
scroll
scroll
scroll
scroll
Compressors number
n.
1
1
1
1
1
Capacity steps
n.
1
1
1
1
1
Compressors power input
kW
5,55
6,2
7,16
8,1
9,13
AIR FILTERS
n.
2
2
2
2
2
Filter area
m2
1,24
2,07
2,07
2,07
2,07
Efficiency (ISO EN 16890)
COARSE
60%
60%
60%
60%
60%
REFRIGERANT CIRCUITS
n.
1
1
1
1
1
POWER SUPPLY
V/Ph/Hz
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
ENERGY EFFICIENCY INDEX (2) (5)
EER Energy Efficiency Ratio
kW/kW
3,89
4,27
4,06
4,06
4,05
DIMENSIONS
Length
mm
1085
1305
1305
1305
1305
Width
mm
775
930
930
930
930
Height
mm
1925
1980
1980
1980
1980
NET WEIGHT OVER
kg
338
462
467
479
487
NET WEIGHT UNDER
kg
358
472
477
489
497
REFRIGERANT CONNECTIONS
Gas delivery
ODS Ø
22
22
22
22
22
Liquid return
ODS Ø
16
16
16
22
22
HYDRAULIC CONNECTIONS
CONDENSATE DISCHARGE
Rubber pipe –internal diameter
Ø mm
19
19
19
19
19
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Gross value. Characteristics referred to entering air at 26°C-40%RH; condensing temperature 45°C. ESP=20Pa.
3. SHR = Sensible cooling capacity / Total cooling capacity.
4. Corresponding to the nominal external static pressure
5. The Energy Efficiency Index does not consider the remote air-cooled condenser.
The units highlighted in this publication contain <HFC R410A [GWP100 2088]> fluorinated greenhouse gas

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
16
MEHITS S.p.A.
DATA BOOK
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
039 P2 D
048 P2 D
055 P2 D
062 P2 D
075 P2 D
SIZE
E5
E5
E6
E6
E7
COOLING CAPACITY (2)
Total
kW
38,1
48,6
55,1
61,9
75,4
Sensible
kW
38,1
47,4
55,1
60,6
75,4
SHR (3)
1
0,98
1
0,98
1
Total power input (Comp. + Fans)
kW
9,21
12,5
13,5
15,1
17,9
"EC" SUPPLY FANS
n.
1
1
2
2
2
Air flow
m³/h
10000
12000
15000
15600
20000
Nominal external static pressure
Pa
20
20
20
20
20
Maximum external static pressure
Pa
259
206
654
592
438
Fans power input (4)
kW
1,82
2,31
2,4
2,68
3,6
ON/OFF COMPRESSORS
scroll
scroll
scroll
scroll
scroll
Compressors number
n.
2
2
2
2
2
Capacity steps
n.
2
2
2
2
2
Compressors power input
kW
7,39
10,2
11,1
12,4
14,3
AIR FILTERS
n.
3
3
3
3
4
Filter area
m2
2,59
2,59
3,16
3,16
3,82
Efficiency (ISO EN 16890)
COARSE
60%
60%
60%
60%
60%
REFRIGERANT CIRCUITS
n.
2
2
2
2
2
POWER SUPPLY
V/Ph/Hz
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
ENERGY EFFICIENCY INDEX (2) (5)
EER Energy Efficiency Ratio
kW/kW
4,14
3,89
4,08
4,10
4,21
DIMENSIONS
Length
mm
1630
1630
1875
1875
2175
Width
mm
930
930
930
930
930
Height
mm
1980
1980
1980
1980
1980
NET WEIGHT OVER
kg
584
594
684
704
777
NET WEIGHT UNDER
kg
594
604
694
714
834
REFRIGERANT CONNECTIONS
Gas delivery
ODS Ø
2x16
2x16
2x22
2x22
2x22
Liquid return
ODS Ø
2x16
2x16
2x16
2x16
2x22
HYDRAULIC CONNECTIONS
CONDENSATE DISCHARGE
Rubber pipe –internal diameter
Ø mm
19
19
19
19
19
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Gross value. Characteristics referred to entering air at 26°C-40%RH; condensing temperature 45°C. ESP=20Pa.
3. SHR = Sensible cooling capacity / Total cooling capacity.
4. Corresponding to the nominal external static pressure
5. The Energy Efficiency Index does not consider the remote air-cooled condenser.
The units highlighted in this publication contain <HFC R410A [GWP100 2088]> fluorinated greenhouse gas

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
17
MEHITS S.p.A.
DATA BOOK
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U
U
MODEL
082 P2 D
092 P2 D
102 P2 D
117 P4 D
146 P4 D
SIZE
E7
E8
E8
E9
E9
COOLING CAPACITY (2)
Total
kW
82,5
92
104
122
147
Sensible
kW
79,5
88,1
94,9
122
140
SHR (3)
0,96
0,96
0,91
1
0,95
Total power input (Comp. + Fans)
kW
19,8
22,6
26,4
31,5
39
"EC" SUPPLY FANS
n.
2
2
2
3
3
Air flow
m³/h
20000
22000
22000
32000
32000
Nominal external static pressure
Pa
20
20
20
20
20
Maximum external static pressure
Pa
438
295
295
298
298
Fans power input (4)
kW
3,6
4,37
4,37
6,65
6,65
ON/OFF COMPRESSORS
scroll
scroll
scroll
scroll
scroll
Compressors number
n.
2
2
2
4
4
Capacity steps
n.
2
2
2
4
4
Compressors power input
kW
16,2
18,3
22
24,8
32,4
AIR FILTERS
n.
4
5
5
5
5
Filter area
m2
3,82
4,46
4,46
5,24
5,24
Efficiency (ISO EN 16890)
COARSE
60%
60%
60%
60%
60%
REFRIGERANT CIRCUITS
n.
2
2
2
2
2
POWER SUPPLY
V/Ph/Hz
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
400/3+N/50
ENERGY EFFICIENCY INDEX (2) (5)
EER Energy Efficiency Ratio
kW/kW
4,17
4,07
3,94
3,87
3,77
DIMENSIONS
Length
mm
2175
2499
2499
2899
2899
Width
mm
930
930
930
930
930
Height
mm
1980
1980
1980
1980
1980
NET WEIGHT OVER
kg
784
886
886
--
--
NET WEIGHT UNDER
kg
839
946
946
1150
1210
REFRIGERANT CONNECTIONS
Gas delivery
ODS Ø
2x22
2x22
2x22
2x28
2x28
Liquid return
ODS Ø
2x22
2x22
2x22
2x22
2x22
HYDRAULIC CONNECTIONS
CONDENSATE DISCHARGE
Rubber pipe –internal diameter
Ø mm
19
19
19
19
19
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Gross value. Characteristics referred to entering air at 26°C-40%RH; condensing temperature 45°C. ESP=20Pa.
3. SHR = Sensible cooling capacity / Total cooling capacity.
4. Corresponding to the nominal external static pressure
5. The Energy Efficiency Index does not consider the remote air-cooled condenser.
The units highlighted in this publication contain <HFC R410A [GWP100 2088]> fluorinated greenhouse gas

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
18
MEHITS S.p.A.
DATA BOOK
DUAL FLUID SYSTEM
DUAL FLUID system on the machine allows to obtain two independent cooling systems:
•Chilled water coil
•Direct expansion coil
The microprocessor control system automatically manages the system, by activating the cooling circuit
more convenient according to the parameters set.
With this system, it is possible, with a limited use of space, to solve several plant problems such as:
•Chilled water coil fed with chilled water or mains water as a stand-by of the main cooling
circuit.
•Double chilled water feeding with two independent circuit. This solution is used when you
need to ensure redundancy of the cooling system.
The temperature control is performed with the same logic of the main coil.
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
011 P1 S
014 P1 S
016 P1 S
020 P1 S
022 P1 S
SIZE
E1
E2
E2
E3
E3
COOLING CAPACITY (2)
Total
kW
12,2
17,8
18,4
25,4
26,5
Sensible
kW
11,8
17,2
18
24,6
25,6
SHR (3)
0,97
0,97
0,98
0,97
0,97
COOLING COIL
Water flow rate (2)
m3/h
2,12
3,06
3,16
4,35
4,57
dP coil + valve (2)
kPa
15
33,5
35,6
24,7
26,6
Water volume
l
4,2
5,3
5,3
7,8
7,8
HYDRAULIC CONNECTIONS
WATER INLET / OUTLET ISO 7/1 - R
Ø
1"
1"
1"
1+1/4"
1+1/4"
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
026 P1 S
032 P1 S
037 P1 S
041 P1 S
045 P1 S
SIZE
E3
E4
E4
E4
E4
COOLING CAPACITY (2)
Total
kW
27,4
39
43,4
46
46
Sensible
kW
26,8
38,3
42
44,9
44,9
SHR (3)
0,98
0,98
0,97
0,98
0,98
COOLING COIL
Water flow rate (2)
m3/h
4,71
6,69
7,45
7,92
7,92
dP coil + valve (2)
kPa
28,3
14,2
17,1
19
19
Water volume
l
7,8
13,8
13,8
13,8
13,8
HYDRAULIC CONNECTIONS
WATER INLET / OUTLET ISO 7/1 - R
Ø
1+1/4"
1+1/2"
1+1/2"
1+1/2"
1+1/2"
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Characteristics referred to entering air at 26°C-40%RH with chilled water temperature 7-12°C - 0% glycol
3. SHR = Sensible cooling capacity / Total cooling capacity.
Air conditioner
Remote
condenser
Liquid chiller

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
19
MEHITS S.p.A.
DATA BOOK
TECHNICAL DATA
VERSION (1)
U / O
U / O
U / O
U / O
U / O
MODEL
039 P2 D
048 P2 D
055 P2 D
062 P2 D
075 P2 D
SIZE
E5
E5
E6
E6
E7
COOLING CAPACITY (2)
Total
kW
48,8
55,5
65,3
67,3
101
Sensible
kW
48,8
55,2
63,2
65,4
95,3
SHR (3)
1
0,99
0,97
0,97
0,94
COOLING COIL
Water flow rate (2)
m3/h
8,38
9,54
11,23
11,59
17,42
dP coil + valve (2)
kPa
26,3
33,1
15,7
16,6
38,8
Water volume
l
18,1
18,1
18,1
18,1
24,6
HYDRAULIC CONNECTIONS
WATER INLET / OUTLET ISO 7/1 - R
Ø
2"
2"
2"
2"
2+1/2"
VERSION (1)
U / O
U / O
U / O
U
U
MODEL
082 P2 D
092 P2 D
102 P2 D
117 P4 D
146 P4 D
SIZE
E7
E8
E8
E9
E9
COOLING CAPACITY (2)
Total
kW
101
116
116
136
136
Sensible
kW
95,3
108
108
136
136
SHR (3)
0,94
0,93
0,93
1
1
COOLING COIL
Water flow rate (2)
m3/h
17,42
19,9
19,9
23,43
23,43
dP coil + valve (2)
kPa
38,8
49,3
49,3
39,9
39,9
Water volume
l
24,6
28,5
28,5
33,8
33,8
HYDRAULIC CONNECTIONS
WATER INLET / OUTLET ISO 7/1 - R
Ø
2+1/2"
2+1/2"
2+1/2"
3”
3”
THE COOLING CAPACITY DOES NOT CONSIDER THE SUPPLY FAN MOTOR THERMAL LOAD
1. U = Under, downflow / O = Over, upflow
2. Characteristics referred to entering air at 26°C-40%RH with chilled water temperature 7-12°C - 0% glycol
3. SHR = Sensible cooling capacity / Total cooling capacity.
2-WAY BALL VALVE FOR CHILLED WATER FLOW CONTROL
The water flow control in the finned coil is acieved through a 2-way modulating ball valve with equal
percentage flow control ensured by the integrated characterizing disc.
This type of valve offers the following series of benefits:
•Equal percentage flow control.
•No peaks initial flow.
•Excellent stability control thanks to the integrated characterizing disc.
•Excellent characteristic in partialisation.
•Stability in control.
•Maintenance free.
•Self-cleaning.
CHARACTERISTICS OF THE 2-WAY BALL VALVE
•Closing seal with leakage rate in Class A (EN 12266-1)
•Maximum fluid pressure Ps=1600kPa
•Maximum closing pressure (Close-off) ∆Ps=1400kPa
The rotative actuator is controlled by a signal 0 … 10VDC from the microprocessor controller. The
actuator is equipped with an emergency button for manual operation and is maintenance-free.

t-NEXT DF DX
T_tNEXTDFDX_0719_EN
20
MEHITS S.p.A.
DATA BOOK
WATER QUALITY OF THE HYDRAULIC CIRCUITS
The values shown in the table must be guaranteed during the entire life cycle of the machine.
Description
Symbol
Range
1
Hydrogen Ions
pH
7.5 ÷ 9
2
Presence of calcium (Ca) and magnesium (Mg)
Hardness
4 ÷ 8.5 °D
3
Chlorine ions
Cl-
< 150 ppm
4
Iron Ions
Fe3+
< 0.5 ppm
5
Manganese Ions
Mn2+
< 0.05 ppm
6
Carbon dioxide
CO2
< 10 ppm
7
Hydrogen sulphide
H2S
< 50 ppb
8
Oxygen
O2
< 0.1 ppm
9
Chlorine
Cl2
< 0.5 ppm
10
Ammonia
NH3
< 0.5 ppm
11
Ratio between carbonates and sulphates
HCO3-/SO42-
> 1
12
Sulphate ions
SO4--
< 100 ppm
13
Phosphate ions
PO43-
< 2.0 ppm
where: 1/1.78°D = 1°Fr with 1°Fr = 10 gr CaCO3/ m3
ppm = parts for millions
ppb = part for billion
Explanatory notes:
ref.1: A greater concentration of hydrogen ions (pH) than 9 implies a high risk of deposits, whereas a lower pH than 7 implies a high risk of
corrosion.
ref.2: The hardness measures the amount of Ca and Mg carbonate dissolved in the water with a temperature lower than 100°C (temporary
hardness). A high hardness implies a high risk of deposits.
ref.3: The concentration of chloride ions with higher values than those indicated causes corrosion.
ref. 4 - 5 - 8: The presence of iron and manganese ions and oxygen leads to corrosion.
ref.6 - 7: Carbon dioxide and hydrogen sulphide are impurities that promote corrosion.
ref.9: Usually in water from the waterworks it is a value of between 0.2 and 0.3 ppm. High values cause corrosion.
ref.10: The presence of ammonia reinforces the oxidising power of oxygen
ref.11: Below the value shown in the table, there is a risk of corrosion due to the trigger of galvanic currents between copper and other less noble
metals.
ref.12: The presence of sulphates ions triggers corrosion phenomenon.
ref.13: The presence of phosphates ions triggers corrosion phenomenon.
It is necessary to carry out periodic checks, with withdrawals at different points of the hydraulic system. During the first year of operation, checks are
recommended every 4 months which can be reduced every 6 months starting from the second year of operation.
WARNING:
It is necessary that, in the presence of dirty and / or aggressive waters, an intermediate heat exchanger is installed upstream of the heat
exchangers
ANTIFREEZE MIXTURES
In plants that are not adequately protected by heating cables, protect the hydraulic circuit with an anti-freeze mixture when the ambient air temperature can
drop below 5°C.
The values are indicative and may significantly vary depending on the glycol manufacturer. Refer to your glycol supplier for detail.
The values consider a precautionary difference of 5°C between the minimum ambient air temperature and the freezing temperature of the mixture.
In the hydraulic circuit do not send fluids other than water or mixtures with ethylene / propylene glycol.
If other products are provided, in addition to mixtures of water and ethylene or propylene glycol, contact the Manufacturer to check the compatibility with the
machine components.
Minimum ambient air temperature
°C
5
0
-5
-10
-15
-20
-25
-30
ETHYLENE GLYCOL (suggested % in weight)
%
0
12
20
30
35
40
45
50
Minimum ambient air temperature
°C
5
2
-3
-9
-13
-17
-23
-29
PROPYLENE GLYCOL (suggested % in weight)
%
0
10
20
30
35
40
45
50