EWAQFSS - Computer cooling system DAIKIN - Free user manual and instructions

USER MANUAL EWAQFSS DAIKIN

Air cooled scroll chiller

SS (Standard Efficiency - Standard Noise) SL (Standard Efficiency - Low Noise) SR (Standard Efficiency - Extra Low Noise) XS (High Efficiency - Standard Noise) XL (High Efficiency - Low Noise) XR (High Efficiency - Extra Low Noise) Cooling capacity from 171 to 675 kW Refrigerant: R410A

English language: Original Instructions All other language: Translation of the Original Instructions

This manual is an important supporting document for qualified personnel but it is not intended to replace such personnel. Thank you for purchasing this chiller

IF CASE OF DOUBT CONTACT THE

MANUFACTURER REPRESENTATIVE FOR ADVICE

AND INFORMATION. Description The unit you bought is an “air cooled chiller”, a machine aimed to cool water (or water-glycol mixture) within the limits described in the following. The unit operation is based on vapour compression, condensation and evaporation according to reverse Carnot cycle.The main components are: - Scroll compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure. - Evaporator, where the low pressure liquid reqrigerant evaporates so cooling the water. - Condenser, where high pressure vapour condensate rejecting heat removed from the chilled water in the atmosphere thanks to an air cooled heat exchanger. - Expansion valve allowing to reduced the pressure of condensed liquid from condensation pressure to evaporation pressure. General Information All units are delivered with wiring diagrams, certified drawings, nameplate; and DOC (Declaration Of Conformity); these documents show all technical data for the unit you have bought and they MUST BE

CONSIDERED ESSENTIAL DOCUMENTS OF THIS

MANUAL In case of any discrepancy between this manual and the equipment’s documents please refer to on board documents. In case of any doubt contact the manufacturer representative. The purpose of this manual is to allow the installer and the qualified operator to ensure proper installation, commissioning and maintenance of the unit, without any risk to people, animals and/or objects. Receiving the unit The unit must be inspected for any possible damage immediately upon reaching final place of installation. All components described in the delivery note must be inspected and checked. Should the unit be damaged, do not remove the damaged material and immediately report the damage to the transportation company and request they inspect the unit. Immediately report the damage to the manufacturer representative, a set of photographs are helpful in recognizing responsibility Damage must not be repaired before the inspection of the transportation company representative. Before installing the unit, check that the model and power supply voltage shown on the nameplate are correct. Responsibility for any damage after acceptance of the unit cannot be attributed to the manufacturer. Operating limits Storing Environmental conditions must be within the following limits: Minimum ambient temperature : -20°C Maximum ambient temperature : +42°C Maximum R.H. : 95% not condensing Storing below the minimum temperature may cause damage to components. Storing above the maximum temperature causes opening of safety valves. Storing in condensing atmosphere may damage electronic components. Operation Operation out of the mentioned limits may damage the unit. In case of doubts contact manufacturer representative. Figure 1 - Description of the labels applied to the electrical panel Label Identification 1 – Non flammable gas symbol 5 – Cable tightening warning 2 – Gas type 6 – Electrical hazard symbol 3 – Manufacturer’s logo 7 – Lifting instructions 4 – Hazardous Voltage warning 8 – Unit nameplate dataD-EIMAC00808-16EU - 10 Label Identification Figure 2 - Operating limits

Note The above graphic represents a guidelines about the operating limits of the range. Please refer to Chiller Selection Software (CSS) for real operating limits working conditions for each size. Legend CIAT = Condenser Inlet Air Temperature (°C) ELWT = Evaporator Leaving Water Temperature (°C) A = Operation with Glycol (below 4°C Evap LWT) B = Fan speed modulation or Speedtroll required (below 10°C Condens. Air Temp.) C = Fan speed modulation or Speedtroll required (below 10°C and up to -10°C Condens. Air Temp.)* *Only referred to units with 4-5-6 fans D = In this area units can work at partial load E = In this area the unit minimum capacity might be higher than value shown in Technical Specification table F = Standard Efficiency (standard sound) G = High Efficiency (standard sound) 1 – Non flammable gas symbol 5 – Cable tightening warning 2 – Gas type 6 – Hazardous Voltage warning 3 – Unit nameplate data 7 – Electrical hazard symbol 4 – Manufacturer’s logo 8 – Lifting instructionsD-EIMAC00808-16EU - 11 Safety The unit must be firmly secured to the soil. It is essential to observe the following instructions: The unit can only be lifted using the lifting points marked in yellow fixed to its base. It is forbidden to access the electrical components without having opened the unit main switch and switched off the power supply. It is forbidden to access the electrical components without using an insulating platform. Do not access the electrical components if water and/or moisture are present. Sharp edges and the surface of the condenser section could cause injury. Avoid direct contact and use adeguate protection device Switch off power supply, by opening the main switch, before servicing the cooling fans and/or compressors. Failure to observe this rule could result in serious personal injury. Do not introduce solid objects into the water pipes while the unit is connected to the system. A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet. The unit is supplied with safety valves, that are installed both on the high-pressure and on the low-pressure sides of the refrigerant circuit. It is absolutely forbidden to remove all protections of moving parts. In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of the on- board documentation delivered to the end user. It is strongly recommended to perform installation and maintenance with other people. In case of accidental injury or unease, it is necessary to: - keep calm - press the alarm button if present in the installation site - move the injured person in a warm place far from the unit and in rest position - contact immediately emergency rescue personnel of the building or the Health Emergency Service - wait without leaving the injured person alone until the rescue operators come - give all necessary information to the the rescue operators Avoid installing the chiller in areas that could be dangerous during maintenance operations, such as platforms without parapets or railings or areas not complying with the clearance requirements around the chiller. Noise The unit is a source of noise mainly due to rotation of compressors and fans. The noise level for each model size is listed in sales documentation. If the unit is correctly installed, operated and manteined the noise emission level do not require any special protection device to operate continuosly close to the unit without any risk. In case of installation with special noise requirements it could be necessary to install additional sound attenuation devices. Moving and lifting Avoid bumping and/or jolting during loading/unloading unit from the truck and moving it. Do not push or pull the unit from any part other than the base frame. Secure the unit inside the truck to prevent it from moving and causing damages. Do not allow any part of the unit to fall during transportation or loading/unloading. All units are supplied with the lifting points marked in yellow. Only these points may be used for lifting the unit, as shown in the following Figure 3. Both the lifting ropes and the spacing bars must be strong enough to support the unit safely. Please check the unit’s weight on the unit nameplate. The unit must be lifted with the utmost attention and care following lifting label instructions; lift unit very slowly, keeping it perfectly level. Positioning and assembly All units are designed for installation outdoors, either on balconies or on the ground, provided that the installation area is free of obstacles that could reduce air flow to the condensers coil. The unit must be installed on a robust and perfectly level foundation; should the unit be installed on balconies or roofs, it might be necessary to use weight distribution beams.D-EIMAC00808-16EU - 12 Figure 3 - Lifting the unit 4 fans version

10-12 fans versionD-EIMAC00808-16EU - 14 (The drawing shows only the 8 fans version. For the 10-12 fans version the lifting mode is the same)

For installation on the ground, a strong concrete base, at least 250 mm thickness and wider than the unit must be provided. This base must be able to support the weight of the unit. If the unit is installed in places that are easily accessible to people and animals, it is advisable to install protection grids for the condenser and compressor sections. To ensure best performance on the installation site, the following precautions and instructions must be followed: Avoid air flow recirculation. Make sure that there are no obstacles to hamper air flow. Make sure to provide a strong and solid foundation to reduce noise and vibrations. Avoid installation in particularly dusty environments, in order to reduce soiling of condensers coils. The water in the system must be particularly clean and all traces of oil and rust must be removed. A mechanical water filter must be installed on the unit’s inlet piping. Minimum space requirements It is fundamental to respect minimum distances on all units in order to ensure optimum ventilation to the condenser coils. When deciding where to position the unit and to ensure a proper air flow, the following factors must be taken into consideration: avoid any warm air recirculation avoid insufficient air supply to the air-cooled condenser. Both these conditions can cause an increase of condensing pressure, which leads to a reduction in energy efficiency and refrigerating capacity. Any side of the unit must be accessible for post-installation maintenance operations. Figure 4 shows the minimum space required. Vertical air discharge must not be obstructed. If the unit is surrounded by walls or obstacles of the same height as the unit, this must be installed at a distance no lower than (see Figure 4C or 4D). If these obstacles are higher, the unit must be installed at a distance no lower (see Figure 4E or 4F). Should the unit be installed without observing the recommended minimum distances from walls and/or vertical obstacles, there could be a combination of warm air recirculation and/or insufficient supply to the air-cooled condenser which could cause a reduction of capacity and efficiency. In any case, the microprocessor will allow the unit to adapt itself to new operating conditions and deliver the maximum available capacity under any given circumstances, even if the lateral distance is lower than recommended, unless the operating conditions should affect personel safety or unit reliability. When two or more units are positioned side by side, a distance of at least (see Figure 4G or 4H) between condenser banks is recommended. For further solutions, please consult manufacturer representative. Sound protection When sound levels require special control, great care must be exercised to isolate the unit from its base by appropriately applying anti-vibration elements (supplied as an option). Flexible joints must be installed on the water connections, as well. Water piping Piping must be designed with the lowest number of elbows and the lowest number of vertical changes of direction. In this way, installation costs are reduced considerably and system performance is improved. The water system must have:

1. Anti-vibration mountings in order to reduce transmission of

vibrations to the structures.

2. Isolating valves to isolate the unit from the water system

3. Manual or automatic air venting device at the system’s

highest point.; drain device at the system’s lowest point.

4. Neither the evaporator nor the heat recovery device must

be positioned at the system’s highest point.

5. A suitable device that can maintain the water system under

pressure (expansion tank, etc.).

6. Water temperature and pressure indicators to assist the

operator during service and maintenance.

7. A filter or device that can remove particles from the fluid.

The use of a filter extends the life of the evaporator and pump and helps to keep the water system in a better condition.

8. Evaporator has an electrical resistance with a thermostat

that ensures protection against water freezing at ambient temperatures as low as –25°C. All the other water piping/devices outside the unit must therefore be protected against freezing.

9. The heat recovery device must be emptied of water during

the winter season, unless an ethylene glycol mixture in appropriate percentage is added to the water circuit.

10. If case of unit substitution, the entire water system must be

emptied and cleaned before the new unit is installed. Regular tests and proper chemical treatment of water are recommended before starting up the new unit.

11. In the event that glycol is added to the water system as

anti-freeze protection, pay attention to the fact that suction pressure will be lower, the unit’s performance will be lower and water pressure drops will be greater. All unit-protection systems, such as anti-freeze, and low-pressure protection will need to be readjusted.

12. Before insulating water piping, check that there are no

Figure 6 - Water piping connection for heat recovery exchangers

Water treatment Before putting the unit into operation, clean the water circuit. Dirt, scales, corrosion debrits and other material can accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drop can increase as well, thus reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc. The most appropriate water treatment must be determined locally, according to the type of system and water characteristics. The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by improperly treated water. Table 1 - Acceptable water quality limits pH (25°C) 6,88,0

Evaporator and recovery exchangers anti-freeze protection All evaporators are supplied with a thermostatically controlled anti-freeze electrical resistance, which provides adequate anti- freeze protection at temperatures as low as –25°C. However, unless the heat exchangers are completely empty and cleaned with anti-freeze solution, additional methods should also be used against freezing. Two or more of below protection methods should be considered when designing the system as a whole: Continuous water flow circulation inside piping and exchangers Addition of an appropriate amount of glycol inside the water circuit Additional heat insulation and heating of exposed piping Emptying and cleaning of the heat exchanger during the winter season It is the responsibility of the installer and/or of local maintenance personnel to ensure that described anti-freeze methods are used. Make sure that appropriate anti-freeze protection is maintained at all times. Failing to follow the instructions above could result in unit damage. Damage caused by freezing is not covered by the warranty. Installing the flow switch To ensure sufficient water flow through the evaporator, it is essential that a flow switch be installed on the water circuit. The flow switch can be installed either on the inlet or outlet water piping. The purpose of the flow switch is to stop the unit in the event of interrupted water flow, thus protecting the evaporator from freezing. The manufacturer offers, as optional, a flow switch that has been selected for this purpose. This paddle-type flow switch is suitable for heavy-duty outdoor applications (IP67) and pipe diameters in the range of 1” to 6”. The flow switch is provided with a clean contact which must be electrically connected to terminals shown in the wiring diagram. Flow switch has to be tune to intervene when the evaporator water flow is lower than 50% of nominal flow rate. Heat recovery Units may be optionally equipped with heat recovery system. This system in made by a water cooled heat exchanger located on the compressors discharge pipe and a dedicated managment of condensing pressure. To gurantee compressor operation within its envelope, units with heat recovery cannot operate with water temperature of the heat recovery water lower than 28°C. It is a responsability of plant designer and chiller installer to gurantee the respect of this value (e.g. using recirculating bypass valve) Electrical Installation General specifications All electrical connections to the unit must be carried out in compliance with laws and regulations in force. All installation, management and maintenance activities must be carried out by qualified personnel. Refer to the specific wiring diagram for the unit you have bougth. Should the wiring diagram not be on the unit or should it have been lost, please contact your manufacturer representative, who will send you a copy. In case of discrepance between wiring diagram and electrical panel/cables, please contact the manufacturer representative. Only use copper conductors. Failure to use copper conductors could result in overheating or corrosion at connection points and could damage the unit. To avoid interference, all control wires must be connected separately from the power cables. Use different electrical passage ducts for this purpose. Before servicing the unit in any way, open the general disconnecting switch on the unit’s main power supply. When the unit is off but the disconnecting switch is in the closed position, unused circuits are live, as well. Never open the terminal board box of the compressors before having opened the unit’s general disconnecting switch. Contemporaneity of single-phase and three-phase loads and unbalance between phases could cause leakages towards ground up to 150mA, during the normal operation of the units of the series. If the unit includes devices that cause superior harmonics (like VFD and phase cut), the leakage towards ground could increases to very higher values (about 2 Ampere). The protections for the power supply system have to be designed according to the above mentioned values. Operation Operator’s responsibilities It is essential that the operator is appropriately trained and becomes familiar with the system before operating the unit. In addition to reading this manual, the operator must study the microprocessor operating manual and the wiring diagram in order to understand start-up sequence, operation, shutdown sequence and operation of all the safety devices. During the unit’s initial start-up phase, a technician authorized by the manufacturer is available to answer any questions and to give instructions as to the correct operating procedures. The operator must keep a record of operating data for every installed unit. Another record should also be kept of all the periodical maintenance and servicing activities. If the operator notes abnormal or unusual operating conditions, he is advised to consult the technical service authorized by the manufacturer. If all power to the unit is turned off, the compressor heaters will become inoperable. Once power is resumed to the unit, the compressor and oil separator heaters must be energized a minimum of 12 hours before attempting to start the unit. Failure to do so can damage the compressors due to excessive accumulation of liquid in the compressor. Routine maintenance Minimum maintenance activities are listed in Table 2 Service and limited warramty All units are factory-tested and guaranteed for 12 months as of the first start-up or 18 months as of delivery. These units have been developed and constructed according to high quality standards ensuring years of failure-free operation. It is important, however, to ensure proper and periodical maintenance in accordance with all the procedures listed in this manual and with good practice of machines maintenance. We strongly advise stipulating a maintenance contract with a service authorized by the manufacturer in order to ensure efficient and problem-free service, thanks to the expertise and experience of our personnel. It must also be taken into consideration that the unit requires maintenance also during the warranty period. It must be borne in mind that operating the unit in an inappropriate manner, beyond its operating limits or not performing proper maintenance according to this manual can void the warranty. Observe the following points in particular, in order to conform to warranty limits:

1. The unit cannot function beyond the specified limits

2. The electrical power supply must be within the voltage

limits and without voltage harmonics or sudden changes.

3. The three-phase power supply must not have un

unbalance between phases exceeding 3%. The unit must stay turned off until the electrical problem has been solved.

4. No safety device, either mechanical, electrical or

electronic must be disabled or overridden.

5. The water used for filling the water circuit must be clean

and suitably treated. A mechanical filter must be installed at the point closest to the evaporator inlet.D-EIMAC00808-16EU - 18

6. Unless there is a specific agreement at the time of

ordering, the evaporator water flow rate must never be above 120% and below 80% of the nominal flow rate. Periodic obligatory checks and starting up of appliances under pressure The units are included in category III of the classification established by the European Directive PED 2014/68/EU. For chillers belonging to this category, some local regulations require a periodic inspection by an authorized agency. Please check with your local requirements.

Reading of operating data (Note 3)

Visual inspection of unit for any damage and/or loosening

Verification of thermal insulation integrity

Clean and paint where necessary

Analysis of water (5)

Check of flow switch operation

Verification of control sequence

Verify that all electrical terminals are tight – Tighten if necessary

Clean inside the electrical control board

Visual inspection of components for any signs of overheating

Verify operation of compressor and electrical resistance

Refrigeration circuit:

Verify refrigerant flow using the liquid sight glass – Sight glass full

Verify filter dryer pressure drop

Analyse compressor oil acidity (Note 6)

Clean condenser banks (Note 4)

Verify that fans are well tightened

1. Monthly activities include all the weekly ones.

2. The annual (or early season) activities include all weekly and monthly activities.

3. Unit operating values should be read on a daily basis thus keeping high observation standards.

4. In environments with a high concentration of air-borne particles, it might be necessary to clean the condenser bank more often.

5. Check for any dissolved metals.

6. TAN (Total Acid Number) : 0,10 : No action

Between 0.10 and 0.19 : Replace anti-acid filters and re-check after 1000 running hours. Continue to replace filters until the TAN is lower than 0.10. 0,19 : Replace oil, oil filter and filter dryer. Verify at regular intervals. Important information regarding the refrigerant used This product contains fluorinated greenhouse gases. Do not vent gases into the atmosphere. Refrigerant type: R410A GWP(1) value: 2087,5 (1)GWP = Global Warming Potential The refrigerant quantity necessary for standard operation is indicated on the unit name plate. Real refrigerant quantity charged in the unit is listed on a silver sticker inside the electrical panel. Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local dealer for more information.D-EIMAC00808-16EU - 19 Factory and Field charged units instructions (Important information regarding the refrigerant used) The refrigerant system will be charged with fluorinated greenhouse gases. Do not vent gases into the atmosphere. 1 Fill in with indelible ink the refrigerant charge label supplied with the product as following instructions: - the refrigerant charge for each circuit (1; 2; 3) - the total refrigerant charge (1 + 2 + 3) - calculate the greenhouse gas emission with the following formula: GWP value of the refrigerant x Total refrigerant charge (in kg) / 1000

a Contains fluorinated greenhouse gases b Circuit number c Factory charge d Field charge e Refrigerant charge for each circuit (according to the number of circuits) f Total refrigerant charge g Total refrigerant charge (Factory + Field) h Greenhouse gas emission of the total refrigerant charge expressed as tonnes of CO2 equivalent m Refrigerant type n GWP = Global Warming Potential p Unit serial number 2 The filled out label must be adhered inside the electrical panel. Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local dealer for more information. NOTICE In Europe, the greenhouse gas emission of the total refrigerant charge in the system (expressed as tonnes CO

equivalent) is used to determine the maintenance intervals. Follow the applicable legislation. Formula to calculate the greenhouse gas emission: GWP value of the refrigerant x Total refrigerant charge (in kg) / 1000 Use the GWP value mentioned on the greenhouse gases label. This GWP value is based on the 4th IPCC Assessment Report. The GWP value mentioned in the manual might be outdated (i.e. based on the 3rd IPCC Assessment Report)D-EIMAC00808-16EU - 20 Disposal The unit is made of metal, plastic and electronic parts. All these parts must be disposed of in accordance with the local regulations in terms of disposal. Lead batteries must be collected and sent to specific refuse collection centres. Oil must be collected and sent to specific refuse collection centres.

This manual is a technical aid and does not represent a binding offer. The content cannot be held as explicitly or implicitly guaranteed as complete, precise or reliable. All data and specifications contained herein may be modified without notice. The data communicated at the moment of the order shall hold firm. The manufacturer shall assume no liability whatsoever for any direct or indirect damage, in the widest sense of the term, ensuing from or connected with the use and/or interpretation of this manual. We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding.D-EIMAC00808-16EU - 21

Ferro (mg Fe / l) 1,0 Ião cloreto (mg Cl

under serviceinngrep.

Citirea datelor operative (Nota 3)