Danfoss BOCK UL-HGX12e Reciprocating Compressor User Guide

Danfoss BOCK UL-HGX12e Reciprocating Compressor

Product Information

Reciprocating Compressor

The Reciprocating Compressor is a system designed for CO2 applications. It is important to note that this system is not a general solution for the substitution of F-gases. The information provided in these assembly instructions is based on the manufacturer’s current knowledge and may be subject to change due to further development.

Product Usage Instructions

Compressor assembly

• Follow the guidelines for storage and transport mentioned in section 4.1.
• Set up the compressor according to the instructions provided in section 4.2.
• Connect the pipes as described in section 4.3.
• Ensure proper installation of the suction and pressure lines as explained in section 4.5.
• Operate the shut-off valves as instructed in section 4.6.
• Familiarize yourself with the operating mode of the lockable service connections mentioned in section 4.7.
• Install the suction pipe filter as per the instructions in section 4.8.

Electrical connection

• Refer to section 5.1 for information on contactor and motor contactor selection.
• Connect the driving motor following the guidelines provided in section 5.2.
• If using a direct start, refer to the circuit diagram in section 5.3 for proper wiring instructions.
• If using the electronic trigger unit INT69 G, follow the steps outlined in sections 5.4, 5.5, and 5.6 for connection and functional testing.
• Consider using an oil sump heater as an accessory, as explained in section 5.7.
• For compressors with frequency converters, refer to section 5.8 for selection and operation guidelines.

Technical data

Consult section 8 for detailed technical specifications of the Reciprocating Compressor.

Dimensions and connections

Refer to section 9 for information on the dimensions and connections of the Reciprocating Compressor.

Foreword

DANGER

• Risk of accidents.
• Refrigerating compressors are pressurized machines and, as such, call for heightened caution and care in handling.
• Improper assembly and use of the compressor can result in serious or fatal injury!
• To avoid serious injury or death, observe all safety instructions contained in these instructions before assembly and before using the compressor! This will avoid misunderstandings and prevent serious or fatal injury and damage!
• Never use the product improperly but only as recommended by this manual!
• Observe all product safety labels!
• Refer to local building codes for installation requirements!
• CO2 applications require a completely new kind of system and control. They are not a general solution for the substitution of F-gases. Therefore, we expressly point out that all information in these assembly instructions has been provided according to our current level of knowledge and may change due to further development.
• Legal claims based on the correctness of the information cannot be made at any time and are hereby expressly excluded.
• Unauthorized changes and modifications to the product not covered by this manual are prohibited and will void the warranty!
• This instruction manual is a mandatory part of the product. It must be available to the personnel who operate and maintain this product. It must be passed onto the end customer along with the unit in which the compressor is installed.
• This document is subject to the copyright of Bock GmbH, Germany. The information provided in this manual is subject to change and improvements without notice.

Safety

Identification of safety instructions

• Indicates a dangerous situation which, if not avoided, will cause imme-diate fatal or serious injury
• Indicates a dangerous situation which, if not avoided, may cause fatal or serious injury
• Indicates a dangerous situation which, if not avoided, may immediately cause fairly severe or minor injury.
• Indicates a situation which, if not avoided, may cause property damage
• Important information or tips on simplifying work

General safety instructions

• Risk of accident.
• Refrigerating compressors are pressurized machines and therefore require particular caution and care in handling.
• The maximum permissible overpressure must not be exceeded, even for testing purposes.
• Danger of suffocation!
• CO2 is a nonflammable, acidic, colorless and odorless gas and heavier than air.
• Never release significant volumes of CO2 or the entire contents of the system into closed rooms!
• Safety installations are designed or adjusted in accordance with EN 378 or appropriate national safety standards.

Risk of burns!

• Depending on the operating conditions, surface temperatures of over 140°F (60°C) on the pressure side or below 32°F (0°C) on the suction side can be reached.
• Avoid contact with refrigerant under any circumstances. Contact with refrigerant can lead to severe burns and skin irritations.

Intended use

• The compressor may not be used in potentially explosive environments!
• These assembly instructions describe the standard version of the compressors named in the title manufactured by Bock. Bock refrigerating compressors are intended for installation in a machine (within the EU according to the EU Directives 2006/42/EC
• Machinery Directive and 2014/68/EU Pressure Equipment Directive, outside the EU according to the respective national regulations and guidelines).
• Commissioning is only permissible if the compressors have been installed in accordance with these assembly instructions and the entire system into which they are integrated has been inspected and approved in accordance with legal regulations.
• The compressors are intended for use with CO2 in transcritical and/or subcritical systems in compli-ance with the limits of application.
• Only the refrigerant specified in these instructions may be used!
• Any other use of the compressor is prohibited!

Qualifications required of personnel

• Inadequately qualified personnel poses the risk of accidents, the consequence being serious or fatal injury. Work on compressors must therefore only be performed by personnel with the qualifications listed below:
• e.g., a refrigeration technician or refrigeration mechatronics engineer.
• As well as professions with comparable training, which enable personnel to assemble, install, maintain and repair refrigeration and air-conditioning systems.
• Personnel must be capable of assessing the work to be carried out and recognizing any potential dangers.

Product Description

Short description

• Semi-hermetic two-cylinder reciprocating compressor with suction gas cooled drive motor.
• The flow of refrigerant sucked in from the evaporator is led over the engine and provides for a particularly intensive cooling. Thus the engine can be kept special during high load on a relatively low temperature level.
• Oil pump independent of direction of rotation for reliable and safe oil supply
• One decompression valve each on the low and high pressure side, which vent into the atmosphere when these inadmissibly high printing pressures are reached.

Nameplate (example)

Type key (example)

Areas of application

Refrigerants

• CO2: R744 (Recommendation CO2 quality 4.5 (< 5 ppm H2O))

Oil charge

• The compressors are filled at the factory with the following oil type: BOCK lub E85 (only this oil may be used)
• Property damage is possible.
• The oil level must be in the visible part of the sight glass; damage to the compressor is possible if overfilled or underfilled!

Limits of application

• Compressor operation is possible within the operating limits. These can be found in Bock compressor selection tool (VAP) under vap.bock.de. Observe the information given there.
• Permissible ambient temperature -4°F … 140°F (-20 °C) – (+60 °C).
• Max. permissible discharge end temperature 320°F (160 °C).
• Min. discharge end temperature ≥ 122°F (50 °C).
• Min. oil temperature ≥ 86°F (30 °C).
• Max. permissible switching frequency 8x/h.
• A minimum running time of 3 min. steady-state condition (continuous operation) must be achieved.
• Avoid continuous operation in limit range.
• Max. permissible operating pressure (LP/HP)1): 435 / 798 psig (30/55 bar)
• LP = Low pressure HP = High pressure

Compressor assembly

New compressors are factory-filled with inert gas. Leave this service charge in the compressor for as long as possible and prevent the ingress of air. Check the compressor for transport damage before starting any work.

Storage and transportation

• Storage at -22°F (-30°C) to 158°F (70°C) maximum permissible rela-tive humidity 10 % – 95 %, no condensation.
• Do not store in a corrosive, dusty, vaporous atmosphere or in a com-bustible environment.
• Use transport eyelet.
• Do not lift manually
• Use lifting gear!

Setting up

• Attachments (e.g. pipe holders, additional units, fastening parts, etc.) directly to the compressor are not permissible!
• Provide adequate clearance for maintenance work.
• Ensure adequate compressor ventilation.
• Do not use in a corrosive, dusty, damp atmosphere or a combustible environment.
• Setup on an even surface or frame with sufficient load-bearing capacity.
• Only erect on a slant in consultation with the manufacturer.
• Single compressor preferably on vibration damper.
• Duplex and parallel circuits always rigid.

Pipe connections

• Damage possible.
• Superheating can damage the valve.
• Remove the pipe supports therefore from the valve for soldering and accordingly cool the valve body during and after soldering. Only solder using inert gas to inhibit oxidation products (scale).
• Material soldering/welding connection suction valve: S235JR
• Material soldering/welding connection discharge valve: P250GH
• The pipe connections have graduated inside diameters so that pipes with standard millimeter and inch dimensions can be used.
• The connection diameters of the shut-off valves are rated for maximum compressor output.
• The actual required pipe cross-section must be matched to the output. The same applies to non-return valves.

Pipes

• Pipes and system components must be clean and dry inside and free of scale, swarf and layers of rust and phosphate. Only use air-tight parts.
• Lay pipes correctly. Suitable vibration compensators must be provided to prevent pipes being cracked and broken by severe vibrations.
• Ensure a proper oil return.
• Keep pressure losses to an absolute minimum.

Laying suction and pressure lines

• Property damage possible.
• Improperly installed pipes can cause cracks and tears, the result being a loss of refrigerant.
• Proper layout of the suction and discharge lines directly after the compressor is integral to the system’s smooth running and vibration behaviour.
• A rule of thumb: Always lay the first pipe section starting from the shut-off valve downwards and parallel to the drive shaft.

Operating the shut-off valves

• Before opening or closing the shut-off valve, release the valve spindle seal by approx. ¼ of a turn counter-clockwise.
• After activating the shut-off valve, re-tighten the adjustable valve spindle seal clockwise.

Operating mode of the lockable service connections

Opening the shut-off valve:

• Spindle: turn to the left (counter-clockwise) as far as it will go.
• Shut-off valve completely opened / service connection closed.

Opening the service connection

• Spindle: Turn ½ – 1 turn clockwise.
• Service connection opened / shut-off valve opened.
• After activating the spindle, generally fit the spindle protection cap again and tighten with 14-16 Nm. This serves as a second sealing feature during operation.

Suction pipe filter

• For systems with long pipes and higher degree of contamination, a filter on the suction-side is recommended. The filter has to be be renewed depending on the degree of contamination (reduced pressure loss).

Electrical connection

DANGER

• Risk of electric shock! High voltage!
• Only carry out work when the electrical system is disconnected from the power supply!
• When attaching accessories with an electrical cable, a minimum bending radius of 3x the cable diameter must be maintained for laying the cable.
• Connect the compressor motor in accordance with the circuit diagram (see inside of terminal box).
• Use a suitable cable entry point of the correct protection type (see name plate) for routing cables into the terminal box. Insert the strain reliefs and prevent chafe marks on the cables.
• Compare the voltage and frequency values with the data for the mains power supply.
• Only connect the motor if these values are the same.

Information for contactor and motor contactor selection

• All protection equipment, switching, and monitoring devices must comply with the local safety regulations and established specifications (e.g. VDE) as well as the manufacturer’s specifications. Motor protection switches are required! Motor contactors, feed lines, fuses, and motor protection switches must be rated according to the maximum operating current (see nameplate). For motor protection, use a current-independent, time-delayed overload protection device for monitoring all three phases. Adjust the overload protection device so that it must be actuated within 2 hours at 1.2 times the maximum working current.

Connection of the driving motor

• The compressor is designed with a motor for star-delta circuits.
• Star-delta start-up is only possible for ∆ (e.g. 280 V) power supply.

Example:

INFO

• The supplied insulators must be mounted according to the illustrations as shown.
• The connection examples shown refer to the standard version. In the case of special voltages, the instructions affixed to the terminal box apply.

Circuit diagram for direct start 280 V ∆ / 460 V Y

Electronic trigger unit INT69 G

• The compressor motor is fitted with cold conductor temperature sensors (PTC) connected to the electronic trigger unit INT69 G in the terminal box. In case of excess temperature in the motor winding, the INT69 G deactivates the motor contactor. Once cooled, it can be restarted only if the electronic lock of the output relay (terminals B1+B2) is released by interrupting the supply voltage.
• The hot gas side of the compressor can also be protected against overtemperature using thermal protection thermostats (accessory).
• The unit trips when an overload or inadmissible operating conditions occur. Find and remedy the cause.
• The relay switching output is executed as a floating changeover contact. This electrical circuit operates according to the quiescent current principle, i.e. the relay drops into a the idle position and deactivates the motor contactor even in case of a sensor break or open circuit.

Connection of the trigger unit INT69 G

• Connect the trigger unit INT69 G in accordance with the circuit dia-gram. Protect the trigger unit with a delayed-action fuse (FC2) of max. 4 A. In order to guarantee the protection function, install the trigger unit as the first element in the control power circuit.
• Measure circuit BT1 and BT2 (PTC sensor) must not come into contact with external voltage.
• This would destroy the trigger unit INT69 G and PTC sensors.

Function test of the trigger unit INT69 G

• Before commissioning, after troubleshooting or making changes to the control power circuit, check the functionality of the trigger unit. Perform this check using a continuity tester or gauge.

| Gauge state| Relay position
---|---|---
1.| Deactivated state| 11-12
2.| INT69 G switch-on| 11-14
3.| Remove PTC connector| 11-12
4.| Insert PTC connector| 11-12
5.| Reset after mains on| 11-14

Oil sump heater (accessories)

• In order to avoid damage to the compressor, the compressor must be equipped with an oil sump heater.
• The oil sump heater must generally be connected and operated!
• Connexion: The oil sump heater must be connected via an auxiliary contact (or parallel wired auxiliary contact) of the compressor contactor to a seperate electric circuit.
• Electrical data: 115 V – 1 – 60 Hz, 65 – 135 W, PTC-heater adjusting.

Selection and operation of compressors with frequency converters

• For safe operation of the compressor, the frequency converter must be able to apply an overload of at least 160% of the compressor’s maximum current (I-max.) for at least 3 seconds.

When using frequency converters, the following things must also be observed:

1. The maximum permissible operating current of the compressor (I-max) (see type plate or technical data) must not be exceeded.
2. If abnormal vibrations occur in the system, the affected frequency ranges in the frequency converter must be blanked out accordingly.
3. The maximum output current of the frequency converter must be greater than the maximum current of the compressor (I-max).
4. Carry out all designs and installations in accordance with the local safety regulations and common rules (e.g. VDE) and regulations as well as in accordance with the specifications of the frequency converter manufacturer

The permissible frequency range can be found in the technical data.

f-min/f-max see chapter: Technical data: permissible frequency range

Commissioning

Preparations for start-up

• To protect the compressor against inadmissible operating conditions, high pressure and low pressure pressostats are mandatory on the installation side.
• The compressor has undergone trials in the factory and all functions have been tested. There are therefore no special running-in instructions.

Check the compressor for transport damage!

WARNING

• When the compressor is not running, depending on ambient temperature and amount of refrigerant charge, it is possible that the pressure may rise and exceed permitted levels for the compres-sor. Adequate precautions must be taken to prevent this happening (e.g. using a cold storage medium, a receiver tank, a secondary refrigerant system, or pressure relief devices).

Pressure strength test

• The compressor has been tested in the factory for pressure integrity. If however the entire system is to be subjected to a pressure integrity test, this should be carried out in accordance with UL-/CSA- Standards or a corresponding safety standard without the inclusion of the compressor.

Leak test

Risk of bursting!

• The compressor must only be pressurised using nitrogen (N2). Never pressurise with oxygen or other gases!
• The maximum permissible overpressure of the compressor must not be exceeded at any time during the testing process (see name plate data)! Do not mix any refrigerant with the nitrogen as this could cause the ignition limit to shift into the critical range.
• Carry out the leak test on the refrigerating plant in accordance with UL-/CSA-Standards or a corresponding safety standard, while always observing the maximum permissible overpressure for the compressor.

Evacuation

• Do not start the compressor if it is under vacuum. Do not apply any voltage – even for test purposes (must only be operated with refrigerant).
• Under vacuum, the spark-over and creepage current distances of the terminal board connection bolts shorten; this can result in winding and terminal board damage.
• First evacuate the system and then include the compressor in the evacuation process. Relieve the compressor pressure.
• Open the suction and pressure line shut-off valves.
• Turn on the oil sump heater.
• Evacuate the suction and discharge pressure sides using the vacuum pump.
• At the end of the evacuation process, the vacuum should be < 0.02 psig (1.5 mbar) when the pump is switched off.
• Repeat this process as often as is required.

Refrigerant charge

• Wear personal protective clothing such as goggles and protective gloves!
• Make sure that the suction and pressure line shut-off valves are open.
• Depending upon design of the CO2 refrigerant filling bottle (with/without tubing) CO2 can be filled in liquid after weight or gaseously.
• Use only high-dried CO2 quality (see chapter 3.1)!
• Filling the liquid refrigerant: It is recommended that the system first be filled at standstill with gas on the high-pressure side up to a system pressure of at least 75 psig (5.2 bar) (if it is filled below 75 psig (5.2 bar) with liquid, there is a risk of dry ice formation). Further filling according to system.
• To eliminate the possibility of dry ice formation when the system is operating (during and after the filling process), the shut-off point of the low-pressure switch should be set to a value of at least 75 psig (5.2 bar).
• Never exceed the max. permissible pressures while charging. Precautions must be taken in time.
• A refrigerant supplement, which may become necessary after start-up, can be topped up in vapour form on the suction side.
• Avoid overfilling the machine with refrigerant!
• Do not charge liquid refrigerant into the suction-side on the compressor.
• Do not mix additives with the oil and refrigerant.

Start-up

• Ensure that both shut-off valves are open before starting the compressor!
• Check that the safety and protection devices (pressure switch, motor protection, electrical contact protection measures, etc.) are functioning properly.
• Switch on the compressor and let it run for at least 10 minutes.
• The machine should reach a state of equilibrium.
• Check the oil level: The oil level must be visible in the sight glass.
• After a compressor is replaced, the oil level must be checked again.
• If the level is too high, oil must be drained off (danger of oil liquid shocks; reduced capacity of the refrigerating system).
• If larger quantities of oil have to be topped up, there is a risk of oil hammer effects.
• If this is the case check the oil return!

Pressure relief valves

• The compressor is fitted with two pressure relief valves. One valve each on the suction and discharge side. If excessive pressures are reached, the valves open and prevent further pressure increase.
• Thereby CO2 is blown off to the ambient!
• In the event that a pressure relief valve activates repeatedly, check valve and replace if necessary as during blow-off extreme condi-tions can occure, which may result in a permanent leak. Always check system for refrigerant loss after activation of pressure relief valve!
• The pressure relief valves do not replace any pressure switches and the additional safety valves in the system. Pressure switches must always be installed in the system and designed or adjusted in accordance with EN 378-2 or appropriate safety standards.
• Failure to observe can result in risk of injury from CO2 streaming out of the two pressure relief valves!

Avoid slugging

• Slugging can result in damage to the compressor and cause refrigerant to leak.

To prevent slugging:

• The complete refrigeration system must be properly designed.
• All components must be compatibly rated with each other with regard to output
• (particularly the evaporator and expansion valves).
• Suction gas superheat at the compressor input should be 15 K. (Check the setting of the expansion valve).
• Regard oil temperature and pressure gas temperature. (The pressure gas temperature has to be high enough min. 50°C (122°F), so the oil temperature is > 30°C (86°F)).
• The system must reach a state of equilibrium.
• Particularly in critical systems (e.g. several evaporator points), measures are recommended such as replacement of liquid traps, solenoid valve in the liquid line, etc.
• There should be no movement of coolant whatsoever while the compressor is at a standstill.

Filter dryer

• Gaseous CO2 has a significantly lower solubility in water than other refrigerants. At low temperatures it can therefore cause blocking of valves and filters due to ice or hydrate. For this reason we recom-mend the use of an adequately sized filter drier and a sight glass with a moisture indicator.

Connection of oil level regulator

• The connection “O” is provided for installing an oil level regulator. A corresponding adapter must be obtained from the trade.

Maintenance

Preparation

WARNING

• Before starting any work on the compressor:
• Switch off the compressor and secure it to prevent a restart. Relieve compressor of system pressure.
• Prevent air from infiltrating the system!

After maintenance has been performed:

• Connect safety switch.
• Evacuate compressor.
• Release switch lock.

Work to be carried out

• In order to guarantee optimum operational reliability and service life of the compressor, we recommend carrying out servicing and inspection work at regular intervals:

Oil change:

• not mandatory for factory-produced series systems.
• for field installations or when operating near the application limit: for the first time after 100 to 200 operating hours, then approx. every 3 years or 10,000 – 12,000 operating hours. Dispose of used oil according to the regulations; observe national regulations.
• Annual checks: Oil level, leak tightness, running noises, pressures, temperatures, function of auxiliary devices such as oil sump heater, pressure switch.

Recommended spare parts/accessories

• Available spare parts and accessories can be found on our compressor selection tool under vap.bock.de as well as at bockshop.bock.de.
• Only use genuine Bock spare parts!

Lubricants

• For operation with CO2 the BOCK lub E85 is necessary!

Decommissioning

• Close the shut-off valves on the compressor. CO2 does not need to be recycled and can therefore be blown off into the environment. It is essential to ensure good ventilation or conduct the CO2 into the outdoors to avoid danger of suffocation. When releasing CO2, avoid a fast drop in pressure to prevent oil from exiting with it. If the compressor is unpressurized, remove the piping on the pressure- and suction-side (e.g. dismantling of the shut-off valve, etc.) and remove the compressor using an appropriate hoist.
• Dispose of the oil inside in accordance with the applicable national regulations. When decommissioning the compressor (eg. for service or replacement of the compressor) larger amounts of CO2 in the oil can be set free. If the decompression of the compressor is not sufficient enough, closed shut-off valves may lead to intolerable excessive pressure. For this reason the suction side (LP) and the high pressure side (HP) of the compressor have to be secured by decompression valves.

Technical data

• Tolerance (± 10%) relative to the mean value of the voltage range.
• Other voltages and types of current on request.
• The specifications for max. power consumption apply for 60Hz operation.
• Take account of the max. operating current / max. power consumption for design of fuses, supply lines and safety devices. Fuse: Consumption category AC3
• All specifications are based on the average of the voltage range
• For solder connections

Dimensions and connections

• SV: Suction line
  • DV Discharge line see technical data, Chapter 8

• Only with additional adapter possible
• No connection discharge side

Declaration of incorporation

• Declaration of incorporation for incomplete machinery in accordance with EC Machinery Directive 2006/42/EC, Annex II 1. B

Manufacturer:

• Bock GmbH
• Benzstraße 7
• 72636 Frickenhausen, Germany
• We, as manufacturer, declare in sole responsibility that the incomplete machinery
• Name: Semi-hermetic compressor
• Types: HG(X)12P/60-4 S (HC) ……………………HG(X)88e/3235-4(S) (HC)
• UL-HGX12P/60 S 0,7……………………… UL-HGX66e/2070 S 60
• HGX12P/60 S 0,7 LG …………………….. HGX88e/3235 (ML/S) 95 LG
• HG(X)22(P)(e)/125-4 A …………………… HG(X)34(P)(e)/380-4 (S) A
• HGX34(P)(e)/255-2 (A) …………………..HGX34(P)(e)/380-2 (A)(K)
• HA(X)12P/60-4 ……………………………… HA(X)6/1410-4
• HAX22e/125 LT 2 LG ……………………. HAX44e/665 LT 14 LG
• HGX12e/20-4 (ML/S) CO2 (LT) ……….. HGX44e/565-4 S CO2
• UL-HGX12e/20 (S/ML) 0,7 CO2 (LT)… UL-HGX44e/565 S 31 CO2
• HGX12/20-4 (ML/S/SH) CO2T………….. HGX46/440-4 (ML/S/SH) CO2 T
• UL-HGX12/20 ML(P) 2 CO2T…………. UL-HGX46/440 ML(P) 53 CO2T
• HGZ(X)7/1620-4 ……………………………. HGZ(X)7/2110-4
• HGZ(X)66e/1340 LT 22…………………… HGZ(X)66e/2070 LT 35
• HRX40-2 CO2 T H………………………….. HRX60-2 CO2 T H

Name: Open type compressor

• Types: F(X)2 …………………………………… F(X)88/3235 (NH3)
• FK(X)1………………………………….. FK(X)3
• FK(X)20/120 (K/N/TK)…………….. FK(X)50/980 (K/N/TK)
• Serial nu m ber: BC00000A001 – BN99999Z999

UL-Certificate of Compliance

Dear customer, the Certificate of Compliance can be downloaded by the following QR-Code: https://vap.bock.de/stationaryapplication/Data/DocumentationFiles/COCCO2sub.pdf

Danfoss A/S

• Climate Solutions
• danfoss.us
• +1 888 326 3677
• [email protected]
• Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to form, fit or function of the product.
• All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

References

• bockshop.bock.de
• vap.bock.de
• Danfoss BOCK® Compressors: Eco-Friendly Solutions for Refrigeration Systems | Danfoss

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