MTA HAST 070 N Maintenance And Operating Manual
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MTA HAST 070 N Maintenance And Operating Manual

MTA HAST 070 N Maintenance And Operating Manual

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H
EAT PUMPS
HAS T 070÷140
M A INT E N AN C E AN D OP E R ATI NG M AN UA L
Original instructions in Italian language
38178801085

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Summary of Contents for MTA HAST 070 N

  • Page 1 EAT PUMPS HAS T 070÷140 M A INT E N AN C E AN D OP E R ATI NG M AN UA L Original instructions in Italian language 38178801085...

  • Page 2: Quick Guide

    MAINTENANCE AND OPERATING MANUAL Quick guide U I C K G U I D E 0 . 1 P o w e r u p a n d p o w e r d o w n Power up the machine. At the time of commissioning, follow the machine configuration instructions (see "6.2.1 First power-up").

  • Page 3: Changing The Setpoint

    MAINTENANCE AND OPERATING MANUAL Quick guide 0 . 3 C h a n g i n g t h e s e t p o i n t The unit can be either on or off.  Press in the main menu to open the setpoint menu. ...

  • Page 4: Table Of Contents

    MAINTENANCE AND OPERATING MANUAL Contents O N T E N T S ............................1 UICK GUIDE Power up and power down ................1 Keys........................1 Changing the setpoint..................2 Alarms ......................2 ............................3 ONTENTS ........................5 ENERAL INFORMATION How to interpret the model................5 How to interpret the codes ................
  • Page 5 MAINTENANCE AND OPERATING MANUAL Contents Using the display ................... 50 6.2.1 First power-up ....................50 6.2.2 Main menu ...................... 51 6.2.3 Display menus ....................51 6.2.4 Powering up the unit ..................51 6.2.5 Power-on from a digital input ................ 51 6.2.6 Power-on by supervision system ..............

  • Page 6: General Information

    MAINTENANCE AND OPERATING MANUAL General information HAPTER ENER A L INFO RMATIO N These units are designed to cool or heat a liquid (WATER in the majority of applications). The term “WATER” is used for the sake of simplicity to identify the liquid to be cooled, even if the liquid involved is not water (for example mixtures of water and ethylene or propylene glycol).

  • Page 7: Data Plate

    MAINTENANCE AND OPERATING MANUAL General information 1 . 3 D a t a p l a t e The data plate affixed to the unit shows the main technical data. Identify the size of the unit (see Chapter 1 “General information“) and the MODEL and CODE type of construction.

  • Page 8: Performance Data

    E CH NI C AL PA RA ME TE RS FO R HE AT PU MP S P ACE HE AT E RS A ND H EA T P UMP CO MBI NA TI ON H EA T ER S Model/Version HAST 070 N Air-to-water heat pump: Water-to-water heat pump:...
  • Page 9 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Item Symbol Value Unit Item Symbol Value Unit COPd = + 12 °C 212,30 Tj = + 12 °C 4,98 -- o % or PERd Tj = bivalent COPd 131,78...
  • Page 10 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Item Symbol Value Unit Item Symbol Value Unit Tj = bivalent COPd 157,55 Tj = bivalent temperature 2,81 -- o % temperature or PERd Tj = operation limit COPd 137,37...
  • Page 11 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 90 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 12 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 100 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 13 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 110 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 14 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 120 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 15 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 130 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 16 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 140 N Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 17 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 070 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 18 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 080 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 19 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 090 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 20 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 100 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 21 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 110 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 22 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 120 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 23 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 130 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 24 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 140 SN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 25 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 070 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 26 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 080 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 27 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 090 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 28 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 100 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 29 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 110 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 30 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 120 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 31 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 130 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.
  • Page 32 MAINTENANCE AND OPERATING MANUAL Technical parameters for heat pump space heaters and heat pump combination heaters Model/Version HAST 140 SSN Air-to-water heat pump: Water-to-water heat pump: Brine-to-water heat pump: Low-temperature heat pump: Equipped with a supplementary heater: Heat pump combination heater: Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps.

  • Page 33: Safety

    Arbitrary modifications made to the unit will automatically invalidate all forms of guarantee provided by the manufacturer. ATTENTION  The hot / cold water produced by MTA units cannot be used directly for domestic hygiene or food applications. In the case of such applications, the installer is responsible for fitting an intermediate exchanger.

  • Page 34: General Precautions

    MAINTENANCE AND OPERATING MANUAL Safety 2 . 2 G e n e r a l p r e c a u t i o n s 2.2.1 P re cauti ons d uri ng li fti ng an d transp ort Check that all chains, hooks, shackles and slings are in good condition and of suitable capacity.

  • Page 35: Refrigerants

    MAINTENANCE AND OPERATING MANUAL Safety measuring devices must be checked regularly. Such devices must be replaced when the permitted tolerance values are exceeded. Coloured tracers can be used in service-maintenance operations. Inspect all refrigerant circuit joints including connectors, flanges, and more generally all critical points (open joints) in order to prevent possible leakage of refrigerant gas.

  • Page 36: Description

    MAINTENANCE AND OPERATING MANUAL Description HAPTER E S C R IP T I O N 3 . 1 O p e r a t i n g p r i n c i p l e The unit is equipped with two separate and independent refrigerant circuits. A plate evaporator allows heat exchange between the refrigerant and the process fluid.

  • Page 37: Fans

    MAINTENANCE AND OPERATING MANUAL Description 3.2. 3 Fans The fans are of the axial type, comprising a diecast aluminium fan wheel with sickle shaped blades. The 6-pole electric motor is wired for high speed in N versions and for low speed in SN and SSN versions.

  • Page 38: Liquid Receiver

    MAINTENANCE AND OPERATING MANUAL Description 3.2.6 L iquid re ceiver UPPER AREA: presence of gas only level in HEAT-PUMP mode level in CHILLER mode LEVEL LIQUID SIGHT-GLASS SIGHT GLASS TO THE THERMOSTATIC EXPANSION VALVE FILTER The liquid receiver is installed to hold the higher volume of refrigerant present in the liquid phase when the unit is operating in “HEAT-PUMP (WINTER)”...

  • Page 39: Hydraulic System (Optional)

    MAINTENANCE AND OPERATING MANUAL Description UNIT IN CHILLER MODE FANS 4-WAY UNIT CYCLE REVERSAL VALVE SCHRAEDER VALVES Pilot valve Coil CONDENSER Spool Main valve COMPRESSOR/S WATER INLET THERMOSTATIC VALVE CHECK VALVE FILTER DRAIN COCK CHECK LIQUID SIGHT-GLASS SCHRAEDER VALVE WATER VALVE OUTLET EVAPORATOR...

  • Page 40: Cabinet

    MAINTENANCE AND OPERATING MANUAL Description ATTENTION  The pump must never run dry. 3 . 4 C a b i n e t The cabinet is made of galvanized panels with polyester powder coating. 3 . 5 P r o t e c t i o n r a t i n g The protection rating of the entire unit is IP54 with insulation class F to ensure it is compatible with outdoor operation in all climates.

  • Page 41: Installation

    MAINTENANCE AND OPERATING MANUAL Installation HAPTER NSTA LLATIO N 4 . 1 F o r e w o r d This manual is addressed to personnel responsible for installing, using and servicing the unit. The unit described is designated CHILLER or HEAT PUMP. The expression “pressure”...

  • Page 42: Hydraulic Connections

    MAINTENANCE AND OPERATING MANUAL Installation 8. Do not install the plant in sites exposed to strong winds; if unavoidable, install suitable windscreens. See point 1. 4.3.3 H ydrauli c con necti ons The unit is equipped with threaded or “Victaulic” connections (see diagram below). 1.
  • Page 43 MAINTENANCE AND OPERATING MANUAL Installation Typical water side connection 1. “Victaulic” connections 2. Thermometer 3. Pressure gauge 4. Air bleed valve 5. Discharge valve 6. Anti-vibration coupling 7. Shut-off valve 8. Filter with removable filter basket “VICTAULIC” CONNECTION clamping half collars seal weld-on stub pipe evaporator stub pipe...
  • Page 44 MAINTENANCE AND OPERATING MANUAL Installation Evaporator pressure drops 1 Has T 070 2 Has T 080 3 Has T 090 4 Has T 100 5 Has T 110 6 Has T 120 7 Has T 130 8 Has T 140 Flow rate (m 100% recovery exchanger pressure drops 2 3 4 5...

  • Page 45: Freeze Protection

    MAINTENANCE AND OPERATING MANUAL Installation Desuperheaters pressure drops 1 Has T 070 2 Has T 080 3 Has T 090÷100 4 Has T 110 5 Has T 120 6 Has T 130 7 Has T 140 Flow rate (m 4.3. 4 Fre eze protec tion Even if the minimum working ambient temperature is higher than 0 °C, during shutdown periods in the winter season the unit may be subject to temperatures that are lower than 0 °C.

  • Page 46: Electrical Connections

    MAINTENANCE AND OPERATING MANUAL Installation 4.3.5 E lectric al co nnections The unit's connection to the power supply must be made in compliance with laws and prescriptions in force in the place of installation. The voltage, frequency and number of phases must comply with the data on the unit's nameplate. The power supply voltage must not be outside the tolerances shown on the electrical diagram, even in terms of transients.

  • Page 47: Start - Up

    MAINTENANCE AND OPERATING MANUAL Start-up HAPTER T A R T ATTENTION  Before starting this type of unit, ensure that all personnel involved have read and understood the " Safety" chapter in this manual. 1. The unit shut-off valves must be open. 2.

  • Page 48: Electronic Controller

    MAINTENANCE AND OPERATING MANUAL Electronic controller HAPTER L E C T R O N I C C O N T R O L L E R ATTENTION  This chapter provides an overview of the unit main functions. Some functions may be inactive or not present in the unit for specific requirements.

  • Page 49: Display

    MAINTENANCE AND OPERATING MANUAL Electronic controller NOTE For more details on connectivity consult the specific xCONNECT manual. 6.1. 2 Dis play Consultation and editing of the main operating parameters of the unit take place using the graphic display. ATTENTION  The display is connected to the electronic controller by means of a shielded three-core cable.

  • Page 50: Auxiliary Hardware

    MAINTENANCE AND OPERATING MANUAL Electronic controller • Check that the following mask is shown on the display: • Press to perform the display upload procedure • Wait for the procedure to be completed (approximately 5 minutes) • Check that the mask of the unit's main menu appears on the remote display (see "6.2.2 Main menu") •...

  • Page 51: Using The Display

    MAINTENANCE AND OPERATING MANUAL Electronic controller ATTENTION  Each auxiliary device has a CANbus address that can be set by means of the relative dip switches. Consult the electrical wiring diagram to check addressing and the electrical connection of the auxiliary devices. 6 .

  • Page 52: Main Menu

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.2.2 M ai n men u The main menu is the most important mask of the display. In the area at the top of the screen it shows the unit inlet and outlet water temperature and the operating mode. The area at the bottom of the screen contains a representation of the unit's circuits and shows the operating status of the compressors.

  • Page 53: Keys

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.2. 7 Keys The following table illustrates the meaning of all the keys on the display. Function Scroll through masks Scroll and select the fields in a mask/increase and decrease the value of a field Scroll the parameters on different circuits (prolonged press) Scroll the masks in the ALARM menu Access to I/O menu (see "6.3 I/O menu")

  • Page 54: Icons

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.2.8 I cons The meaning of all the icons that may be shown on the display is illustrated below. Icon Meaning Icon Meaning Unit off Anti-freeze heater enabled/active Unit on Defrost enabled/active Chiller mode operation Heat recovery enabled/active Heat pump mode operation Low-noise enabled/active...

  • Page 55: I/O Menu

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 3 I / O m e n u Press in the main menu to open the I/O (input-output) menu to display the temperature and pressure values and the status of all the devices installed on the unit. Display Ref.

  • Page 56: Ex/Md Auxiliary I/Os

    MAINTENANCE AND OPERATING MANUAL Electronic controller Display Ref. Mask Description conditions IO08 On units with Displays condensing pressures (HP) and evaporation more than two pressures (LP) of circuits 3-4 (if present) circuits IO09 Displays the status of the refrigerant valves in the unit's circuits.
  • Page 57 MAINTENANCE AND OPERATING MANUAL Electronic controller NOTE key appears in the I/O menu only when at last one of the previous auxiliary I/Os is present. Display Ref. Mask Description conditions ME01 With expansion Provides the facility to access the menu for display of modules present digital I/Os of the expansions, information concerning or modularity /...

  • Page 58: Setpoints Menu

    MAINTENANCE AND OPERATING MANUAL Electronic controller The IP menu is accessible from the ME menu, selecting the icon corresponding to free-cooling in mask ME01 (see "6.7.21 Free-cooling"). Display Ref. Mask Description conditions IF01 With free- Displays the opening percentage of the three-way cooling enabled valve and the status of the free-cooling fans.
  • Page 59 MAINTENANCE AND OPERATING MANUAL Electronic controller Display Ref. Mask Description conditions ST04 With Makes it possible to select the room probe for compensated compensation (see "6.7.8.1 Setpoint types") from setpoint enabled among: • BAT1 • BAT2 • Average between BAT1 and BAT2 •...

  • Page 60: User Menu

    MAINTENANCE AND OPERATING MANUAL Electronic controller Display Ref. Mask Description conditions ST12 With adjustable Facility to edit the minimum setting of the adjustable setpoint enabled setpoint (see "6.7.8.1 Setpoint types") in heat pump mode, corresponding to a 4mA signal. Displays the maximum setting of the adjustable setpoint (see "6.7.8.1 Setpoint types"...

  • Page 61: Autostart

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 5 . 1 Au t o s t a r t The autostart function, when enabled, allows the unit to restart automatically after an electrical power loss. 6.5. 2 Dis play l angu age From the USER menu you can personalise various display properties, including the language utilised in the masks (Ref.

  • Page 62: Reserved Menu

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 7 R e s e r v e d m e n u From the main menu, pressing the key provides access to the selection for editing of all the operating parameters. This section is password protected.

  • Page 63: Access To Menu Functions

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.7. 2 Acce ss to menu fun ction s M E N U CU01÷CU08 Configuration CO01÷CO10 Compressors VT01÷VT10 Fans CD01÷CD04 Condenser solenoid valve AN01÷AN02 Anti-freeze RC01÷RC03 Heat recovery DR01÷DR09 Electronic thermostatic valves RG01÷RG06 Regulation DF01÷DF05 Defrost OL01÷OL12...

  • Page 64: Configuration

    MAINTENANCE AND OPERATING MANUAL Electronic controller NOTE The reserved menu submenus are described below. Access to each submenu depends on the level of the password utilised. 6 . 7 . 3 C on f i g u r at i on menu provides the facility to display the main features of the unit.
  • Page 65 MAINTENANCE AND OPERATING MANUAL Electronic controller • Balancing type: By starts - By hours Fixed rotation means that the unit's resources are activated without any form of rotation logic. In FIFO rotation the resources are deactivated starting from the first one to be activated. Balancing rotation envisages the facility to set the type of balancing between hours or starts.

  • Page 66: Fans

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 7 . 4 . 4 M i n i m u m t i m e s In order to maintain correct operation of the unit-s compressors, times for compressor starting and stopping must be observed.
  • Page 67 MAINTENANCE AND OPERATING MANUAL Electronic controller The activation logic of the steps in heat pump mode is shown in the following diagram: Heat pump Step Step 1 Step 2 Set 2 Set 1 Set + DIFF Pressure DIFF In addition, for heat pump mode, operation of the fans can be forced to constantly on. 6 .

  • Page 68: Anti-Freeze

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.7.6 A nti -freeze In the menu you can set the parameters for operation of the anti-freeze heater and the pump in anti-freeze mode. NOTE The menu is accessible by means of the service level password and with the anti-freeze heater or anti-freeze pump enabled. The masks of the anti-freeze menu offer the facility to: •...

  • Page 69: Heat Recovery

    MAINTENANCE AND OPERATING MANUAL Electronic controller The reference probe can be selected from among the following: • BEWIT • BEWOT • BTWOT • BAT1 • BAT2 • average of BATs • lower of BATs • BEWOT1 • BEWOT2 • lower of BEWOTs NOTE A probe can be selected only if it is effectively present in the unit.
  • Page 70 MAINTENANCE AND OPERATING MANUAL Electronic controller In control by temperature it is possible to select the reference probe from between: • BRWOT (if present) • BRWIT (if present) 6 . 7 . 7 . 2 R e c o v e ry o pe ra t i n g l o g i c The heat recovery activation logic on a circuit is illustrated in the following diagram: RECOVERY REQUEST RECOVERY REQUEST...

  • Page 71: Regulation

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 7 . 7 . 3 U n l o a d i n g a n d r e c o v e r y If, during recovery, the condensing pressure in the circuit reaches the unloading threshold, recovery is deactivated and the circuit is set to unloading mode.
  • Page 72 MAINTENANCE AND OPERATING MANUAL Electronic controller If a negative compensation differential is defined, the compensated setpoint diagram is as follows: Compensated setpoint Maximum compensation Chiller Reference setpoint Compensation Reference room setpoint temperature Compensation differential SETPOINT BY TIME BAND • You can define four different time bands, each of which corresponding to a fixed setpoint. When the current time is within a time band, the corresponding setpoint is applied.

  • Page 73: Defrost

    MAINTENANCE AND OPERATING MANUAL Electronic controller KD: derivative coefficient. This is the rate of temperature variation. The contribution of this coefficient increases damping and stability of the system. Coefficient KI acts on the regulation only when the reference temperature is within the Wind-up band. The KD coefficient influences regulation at intervals corresponding to the sampling time.

  • Page 74: Operating Hours

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 7 . 9 . 1 D e f r o s t c o n d i t i o n s The formation of ice on a coil causes a reduction of efficiency of the corresponding circuit. This can be detected by an excessive increase in the maximum difference of real temperature MTDR compared to the target temperature MTDI or an excessive lowering of the evaporation pressure.

  • Page 75: 6.7. 12 Ala Rms Set

    MAINTENANCE AND OPERATING MANUAL Electronic controller • Cycle inversion valves/water-side 3-way cycle inversion valves • Fans (step or speed controlled) • Free-cooling (3-way valves, fans) NOTE During the manual procedures the alarms are always enabled. 6.7. 12 Ala rms set The unit's alarm settings can be edited in the menu.

  • Page 76: Date/Time

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.7.1 5 Date/ time The system date and time can be set and time band operation can be configured in the menu. NOTE The menu is accessible only with the unit in OFF status. ATTENTION ...

  • Page 77: 6.7. 18 Supe Rvi Sion

    MAINTENANCE AND OPERATING MANUAL Electronic controller NOTE The modules are interconnected by way of a switch that allows the system to be connected to a LAN network if required. 6 . 7 . 1 7 . 1 B a c k - u p m o d u l e In a modular system one unit can be defined as the back-up module.

  • Page 78: 6.7.2 0 Speci Al Fu Ncti Ons

    MAINTENANCE AND OPERATING MANUAL Electronic controller The following diagram describes: • Line A: High pressure unloading with stop due to setpoint-differential • Line B: High pressure unloading with stop due to time Pressure Diff Unloading time Unloading time NOTE If the unloading condition is no longer true, when the compressor restarts the compressors minimum time intervals are observed.
  • Page 79 MAINTENANCE AND OPERATING MANUAL Electronic controller 6 . 7 . 2 0 . 6 R e m o t e c o n t r o l The special remote control function is enabled from the display and it provides the facility to perform thermoregulation in accordance with an external analog signal.

  • Page 80: Free-Cooling

    MAINTENANCE AND OPERATING MANUAL Electronic controller 6.7.2 1 F ree-cool ing The parameters for management of Free-Cooling can be defined in the menu. The free-cooling unit is modular. One or more external free-cooling modules can be added in communication with the machine.

  • Page 81: Other Settings

    MAINTENANCE AND OPERATING MANUAL Electronic controller 2. Open the free-cooling menu and set up the parameters for communication with free-cooling modules in mask FC04, specifying the number of modules connected, the Modbus communication utilised, and the Modbus addresses of the modules; 3.
  • Page 82 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A008 Water differential pressure Unit Off Immediate Man. No Digital input switch (***) A009 Phase-monitor Unit Off Immediate Man. Digital input. With phase- /Del.
  • Page 83 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A034 Module 7 not connected to Warning on Immediate Auto With modularity enabled. Only network display on master module A035 Alarm present on module 7 Warning on Immediate Auto...
  • Page 84 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A063 Compressor 3 circuit 1 internal Circuit Off Immediate Man. No alarm A064 Compressor 3 circuit 1 Warning on Immediate Auto If operating hours > defined maintenance display setting...
  • Page 85 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A093 Compressor 3 circuit 2 Warning on Immediate Auto If operating hours > defined maintenance display setting A094 Compressor 3 circuit 2 oil level Circuit Off Immediate Man.
  • Page 86 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A124 Compressor 3 circuit 3 start Compressor off Delayed Man. No error A125 Compressor 4 circuit 3 Circuit Off Immediate Man. No overload A126 Compressor 4 circuit 3 internal Circuit Off...
  • Page 87 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A154 Compressor 4 circuit 4 Circuit Off Immediate Man. No overload A155 Compressor 4 circuit 4 internal Circuit Off Immediate Man. No alarm A156 Compressor 4 circuit 4 Warning on...
  • Page 88 MAINTENANCE AND OPERATING MANUAL Electronic controller Alarm Active Alarm description Controller action Operation Reset Notes code in OFF A181 Pressure transducer EEC HP Circuit Off Delayed Man. No With solenoid valve present in circuit 2 circuit A182 Temperature probe EEC HP Circuit Off Delayed Man.
  • Page 89 The compressor oil level alarms can be used as an oil differential alarm with a 0 second trip delay. (**) To lower the freeze protection setpoint, contact the MTA after-sales service and add a suitable amount of antifreeze solutions to the system (see chap. 4.3.4 “Freeze protection” ).

  • Page 90: Functions And Components Of The Unit

    MAINTENANCE AND OPERATING MANUAL Functions and components of the unit HAPTER U N C T I O N S AND C O M PO N EN TS O F T H E U N I T ATTENTION  For details of the Modularity function consult the specific manual. 7 .

  • Page 91: Pressure Transducers

    MAINTENANCE AND OPERATING MANUAL Functions and components of the unit • pressure transducers, powered directly by the controller; • temperature transducers. 7 . 3 . 1 Pr e s s u r e t r a n s d u c e r s Each refrigerant circuit is equipped with a low pressure transducer and a high pressure transducer.

  • Page 92: Forced Ventilation Of The Electrical Board

    50 K ÷ 500 K ATTENTION  MTA sets the level sensor to operate with sensitivity of 250kOhm (setting A=5, B=H on “Empty” side). The level sensor is set by the producer and its calibration must not be modified. ATTENTION ...

  • Page 93: Operation And Maintenance

    MAINTENANCE AND OPERATING MANUAL Operation and maintenance HAPTER P E R A T I O N A N D M A I N T E N A N C E 8 . 1 O p e r a t i o n ATTENTION ...

  • Page 94: Emptying Of The Evaporator

    MAINTENANCE AND OPERATING MANUAL Operation and maintenance 8.2.2 E mpty ing o f the eva porator The emptying of the evaporator is necessary if the unit tops, if it is not equipped with antifreeze resistances and the ambient temperature reaches water freezing point. There is a cock at the rear of the evaporator to be used for draining it.

  • Page 95: Planning Of Checks And Maintenance Operations

    MAINTENANCE AND OPERATING MANUAL Operation and maintenance 8.2. 3 Plan ning of checks and maintenance operati ons OPERATION Month Months Year  Check to ensure there are no alarm signals.  Check that water outlet temperature is within the programmed interval. ...

  • Page 96: Troubleshooting

    MAINTENANCE AND OPERATING MANUAL Troubleshooting HAPTER R O U B L E S H O O T I N G PROBLEM SYMPTOM CAUSE/REMEDY • Unit is powered and yet fails to start. Presence of shut-down alarms Unit fails to Check for the presence of alarms that prevent the unit from starting. start Unit programmed to run by time band The unit is set to start only within the programmed time bands.
  • Page 97 MAINTENANCE AND OPERATING MANUAL Troubleshooting PROBLEM SYMPTOM CAUSE/REMEDY • Refrigerant compressor stops. Circuit has insufficient refrigerant charge Call in a qualified refrigeration engineer to check for leaks and • icon illuminates. pressure eliminate them. • General alarm relay trip. Have the circuit charged by a qualified refrigeration engineer. Thermal load too high •...
  • Page 98 MAINTENANCE AND OPERATING MANUAL Troubleshooting UNIT IN HEAT PUMP (“WINTER”) MODE In the following points troubleshooting procedures are different with respect to summer operating mode. To gain a fuller understanding of the situation note that: • the cycle is inverted and the unit now serves to heat the user circuit water •...

  • Page 99: Risk Analysis: Residual Risk

    OPERATING AND MAINTENANCE MANUAL Risk analysis: residual risk HAPTER I S K A N A L Y S I S R E S I D U A L R IS K Description of risk: Effect: User instructions: Risk of crushing Falling of machine onto persons and/ Use lifting equipment suited to the or crushing of limbs.
  • Page 100 OPERATING AND MAINTENANCE MANUAL Risk analysis: residual risk Description of risk: Effect: User instructions: 12. Electrical hazard: heat radiations or Risk of electrocution with live parts Strictly observe all manual due to short circuits, scalding on instructions. Chapter 2 “Safety” and other phenomena, such as projection of contact with hot components due to 4.3.5 “Electrical connections”...
  • Page 101 OPERATING AND MAINTENANCE MANUAL Risk analysis: residual risk Description of risk: Effect: User instructions: 23. Inadvertent start-up, overtravel/ Hazards associated with inadvertent Strictly observe all manual start-up of the machine when electric instructions. Chapter 2 “Safety”; unexpected excess speed (or any other power supply is restored.

  • Page 102: Ppendix

    Appendix P P E N D I X OUND LEVEL MEASUREMENTS Lw tot Lp tot Lw tot Lp tot dB(A)** dB(A)* dB(A)** dB(A)* 93,6 80,6 92,6 79,6 87,2 64,2 86,0 73,0 AS T 070 AS T 080 78,9 65,9 78,9 65,9 92,6 79,6...
  • Page 103 Appendix ARAMETERS Access to and, if necessary, editing of parameters is conditional upon 3 password levels: user, service and manufacturer. Parameters that can be edited at user level are also available in the 2 higher levels (service and manufacturer). The editable values at the service level can also be altered at the manufacturer level.
  • Page 104 Appendix Ref. Code Mask Field Level Value Range ANTI-FREEZE RECOVERY ELECTRONIC THERMOSTATIC VALVES REGULATION RG01 Setpoint fixed/compensated/double/ Type User fixed bands/adjustable RG03 Regulation Regulation type User neutral zone neutral zone/PID Chiller regulation band User °C 0÷10 Heat pump regulation User °C 0÷10 band...
  • Page 105 Appendix Ref. Code Mask Field Level Value Range OR02 Weekly band Enable User no/yes Sun/Mon/Tue/Wed/Thu/Fri/ Band start day User Sun/Mon/Tue/Wed/Thu/Fri/ Band end day User OR03 Hourly band Enable User no/yes Band start time User 0÷23/0÷59 Band end time User 0÷23/0÷59 Type User day by day...
  • Page 106 Appendix Ref. Code Mask Field Level Value Range MD04 PID regulation User 0÷999 User 0÷999 Wind-up User °C -30÷80 Sampling time User 0÷32000 MD05 Neutral zone Starts time lag in neutral User 0÷999 zone Starts time lag outside User 0÷999 neutral zone Stops time lag outside User...
  • Page 107 Appendix Ref. Code Mask Field Level Value Range EM01 Email service Number of emails to User 1÷5 configuration send English/Italian/French/ Language User English German/Spanish UNLOADING SPECIAL FUNCTIONS Special functions Airbatic Fixed no/yes FS01 Special functions Rec. pumps Fixed no/yes FS02 Inverter pump Fixed no/yes...
  • Page 108 Appendix Ref. Code Mask Field Level Value Range FREE-COOLING FC03 Free-cooling step/step+autotransf./ (for the case of 0122 Fans Fixed step regulated/ regulated with separete free- inverter cooling units only) FC06 Free-cooling step/step+autotransf./ 0123 Fans Fixed step regulated 0124 Step Fixed 1÷4 OTHER SETTINGS 0125...
  • Page 109 Appendix Ref. Code Mask Field Level Value Range Time band setpoint Band 4 start 18.0 °C 0÷23 0÷59 ST10 0134 Chiller setpoint °C 4÷20 Heat pump setpoint °C 25÷55 Chiller adjustable Minimum setpoint ST11 0135 °C 4÷20 setpoint (4mA) Maximum setpoint 0136 °C 4÷20...
  • Page 110 Appendix LPHANUMERIC STRING POS. VALUE DESCRIPTION VERSION 1-2-3 REFRIGERANT R410A UNIT AMBIENT TEMPERATURE STANDARD -20 °C EVAPORATOR PLATE EVAPORATOR SHELL AND TUBE EVAPORATOR ELECTRONIC THERMOSTATIC VALVE HYDRAULIC UNIT NONE P2+P2 STORAGE + P2 STORAGE + P2+P2 P3+P3 STORAGE + P3 STORAGE + P3+P3 EVAP.
  • Page 111 Appendix REFRIGERANTS SAFETY DATASHEET Designation: R410A (50% Difluoromethane (R32); 50% Pentafluoroethane (R125). INDICATION OF HAZARDS Main hazards: Asphyxia. Specific hazards: Rapid evaporation can cause frost burns. FIRST AID PROCEDURES General information: Do not attempt to administer liquids or solids to persons who have lost consciousness. Inhalation: take the affected person out to the open air.
  • Page 112 Appendix ECOLOGICAL INFORMATION Global warming potential GWP 1730 (R11=1): Ozone depletion potential ODP (R11=1): Considerations on disposal: can be reused following reconditioning. The data in this manual are not binding and may be changed by the manufacturer without notice. Reproduction of this manual, even partial, is strictly prohibited.
  • Page 113 Appendix ENERAL CONDITIONS CHECKLIST ATTENTION  DO NOT POWER ON THE UNIT Start Do not start the unit before repairs Has the unit suffered transport damage? Correct installation of the unit, working Have the minimum installation clearances in compliance with the prescriptions specified in this manual been observed? given in the manual Clean the condensing coils paying attention...
  • Page 114 Appendix IRST START CHECKLIST Start Persons not involved in the operations must be kept clear of the area Stop the unit and find the cause of the Any alarms shown on unit display? problem Trip test: Water differential pressure switch (not present)/ Adjust the plant water gate Check and/or renew the component flwo switch working correctly?
  • Page 115 Appendix YDRAULIC CIRCUIT CHECK LIST Start Water filter upline from evaporator installed Repair or renew the filter correctly? Water inlet and outlet connections follow Correct connections correct direction? Hydraulic circuit connections made in Adapt the connections compliance with best technical practice? Fill hydraulic circuit and/or bleed the air Unit is full of water and all air pockets have if present...
  • Page 116 Appendix ONTROLLER CHECK Start Power supply voltage complies with Connect the unit to the correct power specification given in wiring diagram? supply voltage Replace conductors with conductors of Power feeding conductors are fit for purpose an appropriate type (wiring diagram)? Remake the connection in compliance Protective earth connection complies with statutory legislation?
  • Page 117 Appendix IL CHECKLIST Start Top up in compliance with the Sufficient oil level in compressor? compressor manufacturer's instructions. Preheating of the compressors crankcase is not necessary. The compressor is ready to start The data in this manual are not binding and may be changed by the manufacturer without notice. Reproduction of this manual, even partial, is strictly prohibited.
  • Page 118 Appendix NIT RUNNING CHECKLIST Start Remove all unauthorised persons from the test area Power on the unit. Enter the menu: “Manual Procedure” From the “Manual Procedure” menu: activate the various loads in sequence Contactors and devices functioning correctly? Check the component and renew if necessary Power off the unit Reset thermal-magnetic cutouts or replace compressor fuses...

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