Witt NRP W 1/5 Operating Instructions Manual
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Witt NRP W 1/5 Operating Instructions Manual

Refrigerant pump
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Summary of Contents for Witt NRP W 1/5

  • Page 1 Operating instructions Refrigerant pump...
  • Page 2 TH. WITT Kältemaschinenfabrik GmbH Lukasstraße 32 | 52070 Aachen Tel. +49 241 182080 https://www.th-witt.com sales@th-witt.com Documentation status: 01.08.2024...

  • Page 3: Table Of Contents

    Content Notes used and their meaning ......................5 General.............................6 Safety instructions..........................6 Responsibility............................11 Legal notice ............................11 Standards and certificates........................12 Type designation..........................12 Behaviour in an emergency......................... 14 Intended use ............................14 Technical information........................16 Design and function of the product ...................... 16 Materials used.............................
  • Page 4 Tables Table 1: Information on the name plate ....................13 Table 2: Materials used ..........................16 Table 3: Technical data ..........................16 Table 4: Electrical data for CO2 | 400V 50/60 Hz..................17 Table 5: Pump curves NRP (CO2 | 50 Hz)....................21 Table 6: Pump curves NRP (CO2 | 60 Hz)....................22 Table 7: Necessary diameter of pump suction line..................31 Table 8: Tightening torques of refrigerant pump flanges .................37 Graphics...

  • Page 5: Notes Used And Their Meaning

    1. Notes used and their meaning CAUTION Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury or property damage. WARNING Indicates a potentially dangerous situation that could result in serious bodily injury or death DANGER Stands for an immediate danger that leads to serious bodily injury or death.

  • Page 6: General

    Copyright Nothing from this documentation may be reproduced or distributed in any form (print, photo- copy, microfilm or other process) without the prior written permission of TH. WITT Kältemaschi- nenfabrik GmbH, hereinafter referred to as the manufacturer. This restriction also applies to the drawings, diagrams and tables contained in the documenta- tion.
  • Page 7 General instructions NOTE Observe regulations! Observe all safety regulations regarding the handling of refrigerants, pressurised equipment and electrical machines, in order to prevent personal injury and damage to property. In particular, the wearing of personal protective clothing (incl. respiratory, eye and hand pro- tection) is mandatory, to avoid damage and/or adverse impact of your health.
  • Page 8 Precautions CAUTION Qualified staff  All work on refrigeration products may only be carried out by competent personnel trained in the safe handling of refrigeration systems.  Work on electrical systems or equipment may only be carried out by a qualified electrician. ...
  • Page 9 Warnings WARNING Presence and function of safety devices  All work on the product must only be carried out when it is at a standstill.  Make sure that all safety functions are connected and active during possible manual oper- ation.
  • Page 10 WARNING Screw connections Damage to health due to leaks. During maintenance and repair work, always retighten loosened screw connections to the spec- ified torque using a torque wrench. Welding work on the product Damage to the product, loss of validity of certificates and damage to health due to leaks. Welding work on the product (except to the intended connections) is prohibited.

  • Page 11: Responsibility

    2.2 Responsibility Responsibilities of the manufacturer The instructions given in these operating instructions for maintaining the functional safety of the product, for avoiding potential hazards to people and machinery during transport, installation and assembly, com- missioning, operation as well as maintenance measures refer exclusively to the product. All materials used are designed to withstand the foreseeable mechanical, thermal and chemical stresses and are resistant to the working medium.

  • Page 12: Standards And Certificates

    NOTE Opening the refrigerant pump Opening the refrigerant pump during the warranty period voids all warranty claims. In all cases, return to an authorised workshop or the manufacturer's works or ordering a replacement unit should be preferred. Resale and installation NOTE Always include these instructions with your own delivery, if you resell this product as a compo- nent or install it in machines or units.
  • Page 13 Identification on the type plate Description Type Model type of the product for / Fluid working medium Serial number of the product Year Production month and year Max./min. operating pressure in bar Max./Min. Temperature in °C Motor data Fluid / Group Classification of the working medium according to PED Article 13 Volume Volume of the product that can be filled with working medium...

  • Page 14: Behaviour In An Emergency

    2.7 Intended use WITT products and products distributed by WITT are exclusively intended for use in refrigeration or heat pump systems. NOTE They can only be operated if they have been properly installed and commissioned with other parts, to form a complete system, taking into account all applicable safety instructions.
  • Page 15 NOTE Use of frequency converters When using frequency converters, please note that the frequency must not be reduced below 20 Hz, in order to ensure the minimum required volume flow. The frequency must not be increased above 60 Hz, to avoid overload of the motor. Frequency converters must be set with a steep start-up/shut-down ramp so that the pressure-side non- return valve can open/close quickly enough (1 s has proven successful).

  • Page 16: Technical Information

    3. Technical information NOTE Validity of the information The specified functions, typical values and materials refer to standard types of the product. For special execution please observe the information in the order-related documentation 3.1 Design and function of the product The liquid refrigerant flows from the separator trough a conical filter in the suction connection into the suction housing of the refrigerant pump.
  • Page 17 Speed Max. current consumption Active power factor Active power cos φ [-] n [min N [kW] 50 Hz 60 Hz NRP W 1/5 2.910 0.86 NRP W 2/5 2.910 0.86 NRP W 3/5 2.910 0.86 Nwirk= √ 3 x (U x I NRP W 4/5 2.910...

  • Page 18: Dimensions

    3.4 Dimensions NOTE The illustrations shown are examples of the dimensions of the two different housings currently offered. A specific drawing for your order with all dimensions is submitted with your order. Fig. 3: Example dimensions [mm] of the prototype NRP W x/5 18 | Technical information...
  • Page 19 Fig. 4: Example dimensions [mm] of the prototype NRP W x/12 with round flanges Technical information | 19...
  • Page 20 Fig. 5: Example dimensions [mm] of the prototype NRP W x/12 with square flanges 20 | Technical information...

  • Page 21: Pump Curves

    3.5 Pump curves H [m] 50 Hz V [m³/h] V [gpm] 1/12 2/12 3/12 4/12 18,5 37,0 55,5 74,0 19,0 37,5 55,5 75,0 13,2 18,5 37,0 55,5 74,0 19,0 37,5 55,5 75,0 17,6 17,5 35,5 53,0 71,0 18,5 37,5 55,5 75,0 22,0 16,5...
  • Page 22 H [m] 60 Hz V [m³/h] V [gpm] 1/12 2/12 3/12 4/12 26,4 52,7 79,0 105,3 26,4 53,4 79,8 107,3 13,2 25,9 52,1 78,2 104,2 26,6 53,7 80,1 107,1 17,6 25,4 51,2 76,8 102,4 26,7 54,0 80,3 107,0 22,0 24,8 49,9 74,9 99,8...
  • Page 23 Fig. 6: Pump curves models 1/5 to 4/5 and 1/12 to 4/12 (CO2 | 50 Hz) Technical information | 23...
  • Page 24 Fig. 7: Pump curves models 1/5 to 4/5 and 1/12 to 4/12 (CO2 | 60 Hz) 24 | Technical information...

  • Page 25: Logistics

    4. Logistics 4.1 Safety WARNING Increased attention during transportation Danger of crushing body parts or cut wounds caused by corners and edges  Ensure that the personnel used are competent to unload properly.  Personal protective equipment must be worn during all activities on and with the product. 4.2 Delivery Upon receipt of the product/order, proceed as follows ...

  • Page 26: Transport

    4.3 Transport Fig. 8: Transport of an NRP refrigerant pump using the balance point WARNING Improper transport Damage to the product and risk of physical damage  Always ensure proper transport and storage of the product in accordance with the defined accident prevention measures ...

  • Page 27: Storage

    Fig. 9: Positioning of palettes on industrial trucks (i.e. fork lift trucks) 4.4 Storage WARNING Improper storage Damage to the product and risk of physical damage  Ensure that all openings on the product are always protected against ingress of dirt and moisture with suitable protective caps.

  • Page 28: Installation

    5. Installation NOTE Follow the rules for installation and commissioning to ensure smooth operation of the product. WARNING Observe these Fehler! Verweisquelle konnte nicht gefunden werden.at all times as well as t he Fehler! Verweisquelle konnte nicht gefunden werden.at the beginning of this document! CAUTION Use suitable materials Impact to functionality and damage to health in case of contact with the working medium.

  • Page 29: Connecting The Refrigerant Pumps

    5.2 Connecting the refrigerant pumps The suction line should be connected to the vessel in such a way that gas intake from the return line of the evaporators is avoided (e.g., return line from the evaporators with bend against the vessel wall and at a sufficient distance).
  • Page 30 The vortex breaker should be made of crossed plates with cover plate to prevent vortex formation in the vessel or manifold. Suitable vortex breakers can be obtained from TH. WITT. Above the vortex breaker a liquid level of at least 50mm should be maintained at all times.

  • Page 31: Refrigerant Pump Discharge Line / Motor Cooling Line

    Dimension of the pump inlet To ensure the function of the refrigerant pump even with a low-pressure difference and the associated large volume flow, the diameter of the suction line specified in the order-related documents must be ad- hered to as a minimum. NRP W x/5 NRP W x/12 50 Hz...
  • Page 32 / reverse running! Minimum flow line (Q There are no further Q lines or minimum flow lines required, as the flow through the WITT permanent open motor cooling line is sufficient for the safe operation. Maximum volume flow (Q...

  • Page 33: Protection Of The Refrigerant Pump

    Piping of condensers in CO plants To minimise gas intake into the refrigerant pump and avoid unnecessary pressure fluctuations that can adversely affect the pump, it has proven good practise to immerse the line coming from the condenser into the liquid charge (, i.e. below the minimum liquid level) in the CO vessel.

  • Page 34: Prepare The Installation

    WARNING Observe these Safety instructions at all times as well as the rules for behaviour in an emergency at the beginning of this document! CAUTION Use suitable materials Impact on functionality and damage to health in case of contact with the working medium. Materials used for installation must comply with the applicable regulations and be used professionally in accordance with their technical data.
  • Page 35 guaranteed in front of the motor flange. Note that the motor cooling line can be dismantled! (see chapter 5.4.1) 500-600 mm Fig. 16: Example of a refrigerant pump suspened with a bracket suitable for insulation CAUTION Avoid dropping the pump (Crushing injuries or bruises from the weight of the pump) To prevent the pump from falling down when loosening the threaded rod, it must always be secured against turning loose by means of a lock nut on the pipe bracket.
  • Page 36 The pump can now be lowered by about 20 mm via the threaded rod and swiveled around the axis of the threaded rod until the conical filter can be easily removed. Fig. 17: Swiveling the refrigerant pump to remove the conical filter When lowering, it is essential to ensure that the threaded rod is not unscrewed from the bracket.

  • Page 37: Electrical Connection

    Alignment of the product During installation ensure that the unit is aligned horizontally. Flange alignment Make sure that the flange springs and grooves fit well into each other. Do not use the screw connections to stretch or align the piping. Using flange bolts to bridge a distance between pumps and flanges may destroy the fixing points, in any case unacceptable stresses will occur.
  • Page 38 Fig. 18: Connection scheme CAUTION Wrong rotation direction, pump cannot build up pressure Damage due to reverse operation of the pump The correct direction of rotation is marked with an error on the motor cover for right turning motor. Check the direction of rotation with a phase sequence sensor.
  • Page 39 An overload protection should protect the refrigerant pump against excessive current consumption. The value to be set should be smaller than the max. current I for the refrigerant used. Repair switch It is recommended to provide a repair switch near the refrigerant pump. This switch has proven good practice for commissioning and maintenance work.
  • Page 40 Circuit diagram Fig. 21: Recommended wiring diagram with repair an pressure switch 40 | Installation and commissioning...

  • Page 41: Preparing The Commissioning

    6.4 Preparing the commissioning NOTE Before the product is put in operation, a safety analysis of the refrigeration system must be carried out. This includes  a thorough visual inspection of the entire piping system in accordance with the technical drawings. ...

  • Page 42: Commissioning

    Volllastwechsel entspricht der Druckerhöhung vom Mindestdruck auf den max. zulässigen Druck). WITT refrigerant pumps are closed pumps where all moving parts, including bearings and rotor, are in direct contact with the refrigerant. Any deviations from stable operation will directly affect the moving parts, especially the bearings.

  • Page 43: Failure Analysis

    6.7 Failure analysis No. fault possible cause remedy No power supply to the motor Check or establish power supply Pump does not run Check pressures on suction and pres- Differential pressure switch has tripped sure side. Eliminate causes Foreign particles in the pump Send product to manufacturer for repair Check whether the motor cooling line is Operation against too high pressure...

  • Page 44: Inspection, Maintenance And Servicing

    7. Inspection, maintenance and servicing WARNING Observe these Fehler! Verweisquelle konnte nicht gefunden werden.all times as well as t he Fehler! Verweisquelle konnte nicht gefunden werden.the beginning of this document! Ensure complete documentation of all inspection, maintenance and servicing work. NOTE The inspection of the pressure equipment including the attached safety devices must be car- ried out regularly in accordance with the applicable legislation, standards, regulations and tech-...
  • Page 45 If insoluble oils are used in the refrigeration system, it is particularly important to ensure that any oil that settles in the separator does not get into the pump. Check the pump regularly for oil accumulation. Too much oil in the pump will cause damage! It is recommended to order the corresponding oil drain valve (EA10 GÜ/GB) for deoiling the pump.

  • Page 46: Maintenance

    7.2 Maintenance Removal of the product The refrigerant must be removed before disassembly of the refrigerant pump or before changing the con- ical filter. It is recommended to allow the refrigerant to evaporate into the gas space of the separator via the engine cooling line after closing the suction and discharge valves.

  • Page 47: Decommissioning And Disposal

    8. Decommissioning and disposal NOTE For temporary decommissioning of the product, the labelling requirement "out of service" must be ob- served. The separate, environmentally sound disposal of materials promotes the recyclability of valuable materials. Therefore, at the end of the normal service life, the product itself and all individual parts belonging to it, e.g., auxiliary materials, packaging and wearing parts, must be taken to the recycling collection point.
  • Page 48 TH. WITT Kältemaschinenfabrik GmbH Lukasstraße 32 52070 Aachen +49 241 18208-0 | sales@th-witt.com...

This manual is also suitable for:

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