Swegon BlueBox Zeta Rev Series Installation, Use And Maintenance Manual
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Swegon BlueBox Zeta Rev Series Installation, Use And Maintenance Manual

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Zeta Rev
EN
Installation, use and maintenance manual
19-02-2021

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  • Page 1 Zeta Rev Installation, use and maintenance manual 19-02-2021...
  • Page 2 THANK YOU Thank you for choosing our product. It is the result of many years’ experience and careful design and has been built with first-class quality materials and advan- ced technologies. Declaration or certificate of conformity also guarantees that the equipment meets the requirements of the European Machi- nery Safety Directive.

  • Page 3: Table Of Contents

    Contents Introduction Conformity Description 1.2.1 Symbols 1.2.2 Labels Safety General safety precautions 2.1.1 Discharge of the safety valves 2.1.2 Emergency stop Basic rules 2.2.1 Water flow rate at the heat exchangers 2.2.2 Water composition 2.2.3 Minimum water content in the system 2.2.4 Installing the flow switch 2.2.5...
  • Page 4 Intended use Unintended use Control and safety devices Principles of operation Structure Specifications Control panels 5.7.1 Parametric control 5.7.2 Programmable control Wiring diagram Installation Dimensions and weight Installation site Installation 6.3.1 External positioning 6.3.2 Noise attenuation 6.3.3 Minimum distances Hydraulic connections System components 6.5.1 Installation of pressure sensors...
  • Page 5 7.2.1 Hydraulic tests 7.2.2 Start 7.2.3 Functional tests System testing 7.3.1 Flowzer VP 7.3.2 Flowzer DT 7.3.3 Flowzer VDE 7.3.4 Flowzer VD 7.3.5 Flowzer VFPP 7.3.6 Flowzer VPS Calibration of safety components Checks during operation Alarms and malfunctions 7.6.1 General troubleshooting Temporary stop Stop for long periods of time Maintenance...

  • Page 6: Introduction

    INTRODUCTION 1.1 Conformity With regard to relevant regulations and directives, see the declaration of conformity that is an integral part of the manual. 1.2 Description 1.2.1 Symbols A description of the main symbols used in this manual and on the labels affixed to the unit is given below. Danger symbol;...

  • Page 7: Labels

    1.2.2 Labels For the constructional features, available models and technical data, please refer to the Technical Catalogue. The model, serial number, features, power supply voltage and so on are shown on the labels affixed to the unit (the following illustrations are shown only as an example). The Manufacturer adopts a continuous development policy and, in this perspective, reserves the right to make changes and improvements to the documentation and to the units without prior notice.

  • Page 8: Safety

    SAFETY 2.1 General safety precautions Access to the area around the unit must be prevented by special guarding where this is positioned in a location that is not protected and can be reached by unqualified persons. The equipment operator is responsible for complying with regulatory obligations. The equipment operator is the person who has actual control over the technical operation and free access, which means the possibility of monitoring its components and their operation and the possibility of granting access to third parties.

  • Page 9: Discharge Of The Safety Valves

    In units with capacitors and/or inverters, certain components can remain live for several minutes even after having turned off the main switch. Wait 10 minutes before working on the electrical parts of the unit. Circuits supplied from external sources (made with orange cable) can remain live even after the power sup- ply to the unit has been turned off.

  • Page 10: Basic Rules

    2.2 Basic rules All the units are designed and built in compliance with Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the approximation of the laws of the Member States relating to pressure equipment. To ensure maximum safety, in order to prevent possible risks, follow the instructions below: - this product contains pressurised vessels, live components, moving mechanical parts and very hot and cold surfaces that, in certain situations, can pose a risk: all maintenance work must be carried out by skilled personnel equipped with...

  • Page 11: Water Flow Rate At The Heat Exchangers

    2.2.1 Water flow rate at the heat exchangers It is necessary to ensure that the water flow rate during operation is no higher than 1.5 times and no lower than 0.5 times the nominal flow rate of the unit stated in the Technical Catalogue. In any case, refer to the specific Technical Catalogue for the allowed conditions for water flow in and out of the exchangers.

  • Page 12: Minimum Water Content In The System

    2.2.3 Minimum water content in the system For correct operation of the unit, it is necessary to ensure a buffering on the system such as to comply with the minimum operating time considering the greater between the minimum OFF time and the minimum ON time. In short, these contribute to limiting the number of times the compressors are switched on per hour and to preventing un- desired deviations from the set point of the delivered water temperature.

  • Page 13: Installing The Flow Switch

    2.2.4 Installing the flow switch The units are equipped between the evaporator inlet and outlet with a differential pressure switch. A flow switch, that must be connected by the installer, can be supplied as accessory. The installed flow switch is provided with a 1” male connector. The unit must be installed following the arrow that shows the direction of flow.

  • Page 14: Operation With Water To The Evaporator At Low Temperature

    2.2.6 Operation with water to the evaporator at low temperature With temperatures below 5°C, it is mandatory to work with water and anti-freeze mixtures, and also change the safety devi- ces (anti-freeze, etc.), which must be carried out by qualified authorised personnel or by the manufacturer. The glycol percentage by weight is determined based on the desired temperature of the chilled water (see table). Minimum ambient temperature or liquid outlet temperature (°C) Freezing point (°C)

  • Page 15: Hydraulic Connection To The Heat Recuperator (Dc Option)

    2.2.8 Hydraulic connection to the heat recuperator (DC option) The heat recuperator must be connected to a closed hydraulic circuit. Constant renewal of water causes limescale to build up in the exchanger, which reduces its efficiency in a short time and makes it unserviceable. All units equipped with heat recuperator have water temperature control probe on the return from the system.

  • Page 16: Hydraulic Connection To The Desuperheater (Ds Option)

    2.2.9 Hydraulic connection to the desuperheater (DS option) The heat desuperheater must be connected to a closed hydraulic circuit. Constant renewal of water causes limescale to build up in the exchanger, which reduces its efficiency in a short time and makes it unserviceable. Part of the heat rejected in the condenser can be recovered with a “desuperheater”...

  • Page 17: Condensate Drain (Only For Heat Pump Units)

    2.2.10 Condensate drain (only for heat pump units) As an accessory, all heat pump version units can have a condensate drip tray with drain holes at the base of each conden- sing/evaporating coil. If the supplied holes are used to transfer water through pipes, these drain pipes must be prevented from freezing. Fig.

  • Page 18: Refrigerant Leak Detector

    2.2.11 Refrigerant leak detector A refrigerant leak detector with semiconductor sensor can be installed on the units. This device allows immediate detection of refrigerant leaks, with a warning or with stopping of the unit in pump down, de- pending on how it is managed. The installation of the device is in line with European F-GAS regulations and USA ASHRAE regulations.

  • Page 19: Noise

    2.3 Noise The starting of the unit, with activation of its components, emits a noise whose intensity varies depending on the operating level. The correct location choice and the correct installation prevent the unit causing annoying noise due to resonances, reflections and vibrations.

  • Page 20: Safety Information On The Refrigerant Fluid

    2.5 Safety information on the refrigerant fluid This product contains fluorinated greenhouse gases included in the Kyoto protocol. Do not release these gases into the atmosphere. Type of refrigerant: R410A GWP value: 2088. Based on "IPCC Fifth Assessment Report". GWP is the global warming potential. The quantity of refrigerant fluid is indicated in the unit’s data label.

  • Page 21: Receiving The Product And Storage

    RECEIVING THE PRODUCT AND STORAGE 3.1 Reception On receiving the unit, check that it is undamaged, bearing in mind that it left the factory in perfect condition. Report any signs of damage immediately to the transporter and make a note of these on the Delivery Sheet before signing The relevant sales department or the manufacturer should be informed of the extent of the damage as soon as possible.

  • Page 22: Handling

    3.3 Handling Before each unit handling operation, check that the lifting capacity of the machinery used is compatible with the weight of the unit. Handling must be carried out by adequately equipped qualified personnel. In all lifting operations, make sure the unit is firmly secured in order to prevent accidental falls or overtur- ning.
  • Page 23 If you are using a crane, sling the unit with slings using suitable lifting tubes (not supplied with the unit) inserted in the slots on the base of the unit. Fig. 5 Detail of hooking the sling to the lifting tube It is mandatory to use a lifting beam adjusted to the width of the unit in order to ensure lifting stability.

  • Page 24: Storage

    3.4 Storage There are no special requirements if the unit has to be stored temporarily before installation. Since these units are intended for outdoor installation, they withstand normal atmospheric conditions without problem. The unit must be placed on a flat surface that is suitable for bearing its weight, in order to avoid deformation of the structure with consequent possible breakage.

  • Page 25: Ecodesign Conformity

    ECODESIGN CONFORMITY 4.1 Documentation supplied with the product Listed below are the documents supplied with the machine according to its type, with particular reference to conformity with Directive 2009/125/EC of the European Parliament and of the Council, of 21 October 2009, regarding the establishment of a framework for drafting specifications for the eco-friendly design of energy-related products, and relevant Regulations (hereinafter "Ecodesign").

  • Page 26: Partly Completed Machine

    4.1.3 Partly completed machine Units for which conformity with the Ecodesign Directive must be related to a 'partly completed machine plus remote heat exchanger' system. Otherwise, the unit conforms to all EC requirements. All the points described in the first paragraph apply, with the exceptions stated below. The EC Declaration is not accompanied by Attached Documents Conformity with the Ecodesign Directive depends on the combination of partly completed machine plus remote heat exchan- ger and is therefore the responsibility of the person who makes the selection and combination at the installation stage.

  • Page 27: Conformity Of The Application

    4.2 Conformity of the application The applications allowed as regards the documentation supplied with the unit are indicated below. This applies only in the case of units intended for installation and operation in the European Union. The customer is required to select the unit with regard to the expected operating condition and the Ecodesi- gn conformity required for that condition.

  • Page 28: Product Description

    PRODUCT DESCRIPTION 5.1 Intended use These units are intended for cooling (unit in cooling only version) or for cooling/heating (heat pump version) of heat-carrying fluid; they are generally used in applications in the air-conditioning and refrigeration field. Their use is recommended within the operating limits indicated in the Technical Catalogue. Use outside the operating limits stated in the Technical Catalogue will cause the unit to stop.

  • Page 29: Control And Safety Devices

    5.3 Control and safety devices The unit is integrally managed by an electronic microprocessor control that, through the various temperature and pressure sensors installed in the unit, keeps its operation within the safety limits. All the parameters involved with control of the unit are shown in the “Control Manual” that is an integral part of the docu- mentation of the unit.

  • Page 30: Control Panels

    5.7 Control panels This line of units can be managed with two electronic microprocessor controls; one parametric and the other programmable. The next sections describe the basic operations for both controls, such as starting and stopping the unit, changing operation from cooling to heating and vice versa (in units with heat pump), and changing the set point.
  • Page 31 5.7.1.3 Display of the set point When you press and release button the icons identifying the circuits go out and the working set point is displayed. With the unit "OFF" or in standby mode, with the first press of button the lower display will show "SetC"...

  • Page 32: Programmable Control

    5.7.2 Programmable control For some configurations and functionalities, a programmable control is used Fig. 9 Programmable control display The reference for the following instructions is the main screen that is accessed, from any other screen, by pressing repea- tedly on the button 5.7.2.1 Switching the unit on/off In order to switch the unit on and off from the keypad, make sure the feature is active.

  • Page 33: Installation

    INSTALLATION During installation or whenever work must be carried out on the unit, it is essential to strictly follow the instructions in this manual, comply with the directions on the unit and in any case take all necessary precautions. The pressures in the refrigerant circuit and the electrical components can create risky situations during installation and maintenance work.

  • Page 34: Installation

    6.3 Installation The units are sent from the factory already tested and they need only the electrical and hydraulic connections for instal- lation, except the "LE" (motocondensing) versions and the "LE/HP" (reversible motocondensing) versions for which the refrigerant connections with the remote exchanger must also be made. 6.3.1 External positioning A solid base on which to position the unit must be created.
  • Page 35 6.3.1.1 Rubber anti-vibration mounts In order to reduce vibrations transmitted to the structure, it is advisable to install the unit on rubber or spring anti-vibration mounts, supplied as an accessory and to be requested when placing the order. The dimensional diagram with footprint shows the position and load of each anti-vibration mount. The anti-vibration mounts must be fixed on before positioning the unit on the ground.

  • Page 36: Noise Attenuation

    6.3.2 Noise attenuation The units are designed and built paying particular attention to keeping down noise emission during operation. In addition to the standard versions, there are “LN” (Low Noise) and “SLN” (Super Low Noise) versions for which further devices are used for lower noise emission. Correct installation for both the place and the components, as shown in the relevant chapter, prevents resonances, reflections and vibrations that can be particularly bothersome.

  • Page 37: Hydraulic Connections

    6.4 Hydraulic connections When preparing to connect the hydraulic circuit for the evaporator (refer to the diagrams included in the manual), it is good practice to comply with the following instructions and in any case to follow national or local regulations. Fit the pipes to the unit using flexible couplings in order to prevent transmission of vibrations and compensate thermal expansion.
  • Page 38 Fig. 12 Recommended hydraulic circuit Evaporator Water filter Thermometer Motor-driven pump Flow switch Flexible coupling System filling unit Water pressure gauge Valve Safety valve Storage tank Air valve Expansion vessel Check valve It is essential for the water to come in at the connection indicated in the dimensional diagram and with the relevant label on the unit.

  • Page 39: System Components

    6.5 System components 6.5.1 Installation of pressure sensors If the operating logic requires the installation of pressure sensors in the system, the Manufacturer supplies a kit of measu- ring devices to be assembled by the fitter. The kit consists of: - 2 pressure sensors;...

  • Page 40: Installation Of Temperature Sensor

    6.5.2 Installation of temperature sensor If the operating logic requires the installation of a temperature sensor in the system, the Manufacturer supplies the neces- sary kit to be assembled by the fitter. The kit consists of: - 1 threaded probe pocket G1/2"; - 1 temperature sensor.

  • Page 41: Electrical Connections

    6.6 Electrical connections All electrical operations must be carried out by personnel having the necessary legal requirements, and trained and infor- med on the risks connected with these operations. The sizing and characteristics of the power lines and relevant components must be determined by staff qualified to design electrical systems, following the international and national regulations of the place of installation of the units in conformity with the regulations in force at the time of installation.

  • Page 42: Refrigeration Connections

    6.7 Refrigeration connections For the "LE" (motocondensing) versions and the "LE/HP" (reversible motocondensing) versions, the refrigerant connections must be made between the unit and the remote exchanger. The "LE" and "LE/HP" version units are "dry run" tested, and the refrigerant circuit is charged at the factory with a mixture of nitrogen and helium at a pressure of about 10 bar.

  • Page 43: Le Version: Unit Installed At A Higher Level Than The Remote Exchanger

    Recommended diameters for R410A - The thickness of the pipe must be compatible with the refrigerant used and with current regulations. Equivalent length 10 m Equivalent length 20 m Equivalent length 30 m Model Liquid Liquid Liquid 10.2 12.2 13.2 15.2 16.2 14.4 16.4 18.4 20.4 24.4 The above mentioned diameters were chosen in order to optimise the performance of the units, contem- poraneously ensuring the proper operation at the permissible conditions and to contain the refrigerant charge within reasonable limits.

  • Page 44: Le Version: Unit Installed At A Lower Level Than The Remote Exchanger

    6.7.3 LE version: unit installed at a lower level than the remote exchanger Fit a syphon on the highest suction line "G" of the evaporator in order to prevent liquid refrigerant from going towards the compressor when the unit is not running. In the horizontal sections of the suction line "G", it is advisable to have a slope of at least 1% to facilitate oil return to the compressor.

  • Page 45: Le/Hp Version: Unit Installed At A Lower Level Than The Remote Exchanger

    6.7.5 LE/HP version: unit installed at a lower level than the remote exchanger Fit a syphon on the highest suction/delivery line "G" of the evaporator in order to prevent liquid refrigerant from going towards the compressor when the unit is not running. There must be syphons on the vertical sections of the suction/delivery line "G" to facilitate oil return to the compressor. The height "h"...

  • Page 46: Vacuum And Refrigerant Charge

    6.9 Vacuum and refrigerant charge Open the taps of the unit and evacuate the pre-charge of nitrogen and helium before completing the refrigerant connections. Do not leave the refrigerant circuit open for more than 15-30 min as the high hygroscopic nature of the oil can cause it to absorb moisture that would be detrimental to the circuit.

  • Page 47: Topping Up With Oil

    Additional refrigerant charges R410A per linear metre of pipe Diameter (mm) Gas (kg/m) Liquid (kg/m) 0,014 0,139 0,019 0,182 0,029 0,285 0,045 0,445 0,074 0,729 0,111 1,082 0,182 1,779 0,289 2,825 6.10 Topping up with oil According to the length and diameter of the pipes made for remote exchanger connection, it may be necessary to increase the oil charge.

  • Page 48: Commissioning

    COMMISSIONING 7.1 Preliminary operations Make sure the main disconnect switch is in the OFF position. In units with pumps, their power supply is mechanically locked. Restore functional conditions only on starting. If the pumps of the unit are not locked, electrically isolate them by operating the protective devices, to pre- vent automatic starting, in the event of antifreeze function activation, during the preliminary operations.

  • Page 49: Checking The Pre-Charge Of The Expansion Vessel

    The heaters in the compressor crankcase are switched on when the master disconnect switch is closed: this must be done at least 12 hours before starting the unit. To check that the heaters are working correctly, check that the lower part of the compressors is hot and in any case at a temperature of 10 - 15 °C above ambient temperature.

  • Page 50: Checking The Volume Of The Expansion Vessel

    7.1.2 Checking the volume of the expansion vessel As the pre-charge pressure increases, the maximum volume of the system supported by the expansion vessel supplied as standard, decreases. where - VI: volume of the system supported by the expansion vessel [l] - VVE: volume of the expansion vessel [l] - Ce: expansion coefficient of water - pVE: pre-charge pressure of the expansion vessel [barg] - pVS: calibration pressure of the safety valve [barg]...

  • Page 51: Preliminary Operations For Le And Le/Hp Units

    7.1.3 Preliminary operations for LE and LE/HP units In addition to the previous general checks, the units with remote exchanger require further investigation: - check the correct connection of the environment control to the terminals as in the wiring diagram; - make sure there is an air flow control switch in the remote exchanger (in the case of units with several remote exchan- gers, a flow control switch must be installed for each one);...

  • Page 52: First Starting

    7.2 First starting When the unit is started for the first time, some important tests and checks must be done. 7.2.1 Hydraulic tests So that the unit can operate, the external OK signal device must be closed (refer to the wiring diagram provided with the unit).

  • Page 53: Functional Tests

    7.2.3 Functional tests With the starting of the unit, a few seconds after the starting of the pump, if managed by the control, the compressors will start according to the request of the thermoregulation. After a few hours of operation of the compressors, check that the liquid sight glass has a green ring: if it is yellow, there is moisture in the circuit.

  • Page 54: System Testing

    7.3 System testing Specific logics have been developed according to which the controller manages the hydraulic systems connected to the unit. The management logics are intended to increase system efficiency and save energy for water circulation at the same time. With the help of these logics, the circulating water fulfils the demands of the system, without exceeding the design flow rate limits and without jeopardising correct operation of the cooling unit.
  • Page 55 The pump operating speed percentage in free cooling units must be set up both when free cooling is enabled and when it is not. The operator has to repeat the manual procedure to find the pump operating speed with the free cooling valve open and then closed.
  • Page 56 7.3.1.2 Setting of pump speed (base controller featured) If the constant water flow rate to the system is to be adjusted through adjustment of the speed of the pump present in the unit, the inverter that controls it must be suitably adjusted. The inverter installed in the unit is already factory preset to operate at a constant flow rate.
  • Page 57 How to set up parameters on the inverter display in non free cooling units - press “Menu”, go to “Parameters” using the arrow buttons and confirm with “Select”; - in the “Parameters” menu, select “Complete List” using the arrow buttons and confirm with “Select”; - using the arrow buttons, select group “28”...

  • Page 58: Flowzer Dt

    7.3.2 Flowzer DT The “DT” function is designed to change the pump speed in order to have a constant temperature difference between the unit inlet and outlet. The resulting effect is that the temperature of water supplied to the system is constant. When the load is reduced, the water flow rate is reduced accordingly, which results in consumption saving.
  • Page 59 7.3.2.1 Setting the operating setpoint difference The units are shipped from the factory with a setpoint difference value of 5°C. The procedure below explains how to edit the factory value. - go to the main screen and press the arrow right button; - click the arrow down button to select the “Flowzer” function and then press “Enter” to confirm; - Press the button “SET”...
  • Page 60 - Vmin = minimum water volume in the system/plant - UL = limit of the supply. If the operating logic of the secondary circuit includes stopping of the water flow rate, the capacity of the buffer tank must be sized against the min. volume of water required for unit operation. If user points with 3-way valves are installed in the system and water is circulated to the secondary circuit, the capacity of the buffer tank can be reduced.
  • Page 61 The abbreviations present in the diagram indicate: - A2 = cooling unit controller - BT1 = unit input temperature sensor - BT2 = unit output temperature sensor - EU = heat exchanger in cooling unit - BP41= differential pressure sensor; - ΔPex = pressure difference at the ends of the unit;...

  • Page 62: Flowzer Vde

    7.3.3 Flowzer VDE The “VDE” function is used to set the speed of the pump to such level that the pressure difference between the unit inlet and outlet is kept constant and the water flow rate is consequently kept constant. The speed of the pump is set automatically to preserve the desired flow through the heat exchanger in the unit. This function is useful when the head of the pump aboard the unit is greater than the system requires, which would result in a higher water flow circulating.

  • Page 63: Flowzer Vd

    7.3.3.1 Editing the operating pressure difference in the unit The procedure below explains how to edit the factory value. - go to the main screen and press the arrow right button; - click the arrow down button to select the “Flowzer” function and then press “Enter” to confirm; - Press the button “SET”...
  • Page 64 - Y3V = 3-way valve servo controls - Vmin = minimum water volume in the system/plant - UL = limit of the supply. This type of system requires that the min. water flow rate is also guaranteed when there is no load. This is made possible through the installation of 3-way valves on the user points.

  • Page 65: Flowzer Vfpp

    7.3.5 Flowzer VFPP The “VFPP” function is designed to control variable flow systems to the primary circuit. The system keeps stable the difference in the water pressure and temperature in the system delivery line as the demand changes. The water flow rate and temperature are independent variables and not directly connected. Control of the “single pump in the system”...
  • Page 66 - Vmin = minimum water volume in the system/plant - UL = limit of the supply. 7.3.5.1 Setting the operating setpoint difference Below is the procedure to be followed to edit the pressure difference setpoint. - go to the main screen and press the arrow right button; - click the arrow down button to select the “Flowzer”...
  • Page 67 Letter “L” appears in the first screen of the Flowzer menu to indicate that the value ΔPex is lower than the setpoint stored in parameter “PA22”. If the value ΔPex is higher than the setpoint stored in parameter “PA55”, letter “H” appears in this position, instead of “L”. 7.3.5.4 Checking the minimum flow rate Progressively close all the user points and check that the pump speed slows progressively.

  • Page 68: Flowzer Vps

    7.3.6 Flowzer VPS The “VPS” function modulates the flow rate to the primary circuit following the flow of the secondary circuit, taking as re- ference the difference in the water temperature measured between the outlet of the primary circuit and the bypass pipe. Water flow rate control in the primary circuit always takes place within the limits set for correct operation of the refrigerant unit.
  • Page 69 7.3.6.5 Setting the operating setpoint difference The value stored in the operating temperature difference parameter, as set at the factory, is the result of our experience with different systems. An incorrect value will eventually reduce the setting efficiency. Below is the procedure to be followed to edit the temperature difference setpoint. - go to the main screen and press the arrow right button;...
  • Page 70 Letter “L” appears in the first screen of the Flowzer menu to indicate that the value ΔPex is lower than the setpoint stored in parameter “PA22”. If the value ΔPex is higher than the setpoint stored in parameter “PA55”, letter “H” appears in this position, instead of “L”. Translation from original instructions We reserve the right to make changes without any prior notice.

  • Page 71: Calibration Of Safety Components

    7.4 Calibration of safety components Any work on the unit must be carried out by qualified authorised personnel. Incorrect calibration values can cause serious damage to the unit and harm people. The control and safety equipment is calibrated and tested in the factory before the unit is shipped. However, after the unit has been started, the safety devices must be checked (only the high and low pressure switches).

  • Page 72: Checks During Operation

    7.5 Checks during operation With the circuits operating at 100% and stable at working conditions near the nominal ones, check: - that the electrical absorption of the unit is close to the data shown in the wiring diagram. Considerably different values may be due to the reduced capacity operation of the unit, at working conditions very different from nominal ones, or to the malfunctioning of one or more components.

  • Page 73: Alarms And Malfunctions

    7.6 Alarms and malfunctions Possible malfunctions will trigger the protective devices and safety devices of the unit before serious faults occur. All the “warnings” and “alarms” are recorded in the memory of the control and displayed on the display of the unit. Before resetting an alarm, the cause that triggered it must be found and eliminated.
  • Page 74 SYMPTOM LIKELY CAUSE POSSIBLE SOLUTION Check that the high pressure switches Opening of the valve due to failure of are working and, if necessary, replace Presence of oil on the discharge of the the protective devices to operate. them. safety valve. The valve must be replaced.

  • Page 75: Temporary Stop

    7.7 Temporary stop The stopping of the unit for a few hours in the day “during non-working hours” or for a few days “over the weekend” is con- sidered temporary. The unit must be stopped using the display of the control, the external OK signal or via serial if included. During the temporary stop, the unit must be powered correctly.

  • Page 76: Maintenance

    MAINTENANCE All the operations described in this chapter must always be carried out by qualified and authorised person- nel. Before carrying out any work on the unit or accessing internal parts, make sure you have turned off the power supply to it. The compressors and delivery pipes are very hot.

  • Page 77: External Cleaning

    8.2 External cleaning The component of the unit that needs most care is the finned pack heat exchanger. It is essential to keep it clean and free of dirt and/or deposits that can hinder or prevent air flow. Regular cleaning of the surface of the coil is essential for the unit to work correctly and also increases the operating life of the exchanger and the unit.

  • Page 78: Cleaning The Microchannel Coils

    8.2.2 Cleaning the microchannel coils Microchannel coils must be cleaned regularly (see Periodic checks section) Routine and documented cleaning is a necessary condition for maintaining the warranty on the coils. In addition to the required periodic cleaning, if the unit is used seasonally, we strongly recommend cleaning the microchannel coils at the end of seasonal use, so that no residues remain on the coils, and then again before starting the unit.

  • Page 79: Cleaning E-Coated Microchannel Coils

    8.2.3 Cleaning e-coated microchannel coils Microchannel coils must be cleaned regularly (see Periodic checks section) Routine and documented cleaning is a necessary condition for maintaining the warranty on the coils and on the e-coated treatment. In addition to the required periodic cleaning, if the unit is used seasonally, we strongly recommend cleaning the microchannel coils at the end of seasonal use, so that no residues remain on the coils, and then again before starting the unit.

  • Page 80: Internal Cleaning

    8.3 Internal cleaning It is essential to keep the installation site clean and tidy for correct maintenance of the unit and to keep it in good working order. 8.3.1 Cleaning the unit Keep the inside of the electrical control panel and (where present) the compressor compartment clean. After working on the unit, always clean the electrical control panel of any work remnants and extraneous components.

  • Page 81: Cleaning The Plate Heat Exchangers

    8.3.2 Cleaning the plate heat exchangers Thanks to the generally very high level of turbulence, in plate heat exchangers, a self-cleaning effect takes place in the channels. However, in some applications the tendency to scaling and/or the formation of deposits in the heat exchanger can be very high (e.g.

  • Page 82: Periodic Checks

    8.4 Periodic checks Carry out periodic checks to make sure the unit is working correctly: RECOMMEN- OPERATION DED FREQUEN- Check the operation of all the control and safety equipment as described previously. Monthly Check the tightness of the electrical terminals in the electrical control panel and in the terminal bo- ards of the compressors.

  • Page 83: Unscheduled Maintenance

    8.5 Unscheduled maintenance After correctly starting-up and carrying out the relevant checks, the units normally do not need any intervention by the cu- stomer service in order to check the charge of the refrigerant gas. 8.5.1 Special work With use of the unit, particular situations may occur that require work to be carried out promptly. Even in an emergency, work on the unit must be carried out by skilled personnel in safe conditions.

  • Page 84: Decommissioning

    DECOMMISSIONING With reference to the European waste management directive, we inform you of the following: - The owner of electrical and electronic equipment (EEE) is obliged not to dispose of it as non-separated municipal waste, and must dispose of it via separate collection through public or private waste collection systems as required by local regulations.
  • Page 85 Page intentionally blank We reserve the right to make changes without any prior notice. Translation from original instructions...
  • Page 86 Page intentionally blank Translation from original instructions We reserve the right to make changes without any prior notice.
  • Page 87 Page intentionally blank We reserve the right to make changes without any prior notice. Translation from original instructions...

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