Danfoss PAHT 256-308 Operation Manual
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Danfoss PAHT 256-308 Operation Manual

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Operation guide
PAHT pumps
PAHT 256-308
Operation, Installation and
Maintenance Manual
180R9289 | AQ109686503106en-001102
hpp.danfoss.com
© Danfoss | 2023.01
| 1

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  • Page 1 Operation guide PAHT pumps PAHT 256-308 Operation, Installation and Maintenance Manual 180R9289 | AQ109686503106en-001102 hpp.danfoss.com © Danfoss | 2023.01...

  • Page 2: Table Of Contents

    Local regulations...............10 Pre mounting checklist, based on Danfoss preferred system designs ....11 Lifting and positioning .
  • Page 3 Data sheet PAHTG 2-308 pumps (AI106586503085en-000901) ......19 Pump instruction PAHT 256-308 (180R9257_AN228286503049en-000701) ....31 Electric motor manual (180R9230) .

  • Page 4: Validity

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Validity This manual is valid for PAHT G pumps with the following code numbers/serial numbers: PAHT 256 Code no. 180B1001 Serial no. XXXXXX03-XXX PAHT 308 Code no. 180B1002 Serial no.

  • Page 5: Introduction

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps General Introduction The PAHT pumps and pump units are manufac- tured by Danfoss A/S, and are sold and marketed by a net of authorized distributors world wide. This manual contains the necessary instructions for the installation, operation and service of the pumps used for technical water.

  • Page 6: Manufacturer And Customer Service Address

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 1.3 Manufacturer and customer service Web: hpp.danfoss.com address: Your local Danfoss pump distributor can be found on our homepage. Danfoss A/S 1.4 Country specific information High Pressure Pumps 1.4.1 United Kingdom...

  • Page 7: Commissioning And Servicing The Unit

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps It is always the system builders´ responsibility • Do not try to lift the pump unit manually; that the system design does not cause any kind most of the pumps weigh more than...

  • Page 8: Filtration

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 3.8 Properties of water It is recommended NOT to use the pump for other media than specified in the Data sheet. 3.7 Filtration (10µm absolute [β ≥ 5000]) 3.9 Air bubbles Requirements are specified in appendix 1, Data sheet and appendix 2, Instruction.

  • Page 9: Return To Supplier

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Pumps which have a weight above 20 kilos (see Wrong lifting: appendix 1, Data sheet) must be handled by using lifting eyes and slings. When lifting the pump unit, one sling must be attached to the electric motor and one sling around the pump.

  • Page 10: Installation And Commissioning

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Installation and commissioning 5.1 Important dimensions 5.3 Fluid temperature Physical dimensions and connections of the pump unit are described in appendix 1, Data Before start-up, the fluid and pump housing sheet.

  • Page 11: Pre Mounting Checklist, Based On Danfoss Preferred System Designs

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 5.6 Pre mounting checklist, based on Danfoss preferred system designs Table 1: Check points when assembling and commissioning system Check points Comment OK ? Ensure that the environmental conditions are safe.

  • Page 12: Ensure Free Flow

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 5.12 Ensure free flow Ensure free flow from relief valve (table 1, item 5.6, CP 8). A blocked relief valve can cause excessive build-up of pressure and thereby cause •...

  • Page 13: Operation Of Motor Pump Unit

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Operation of motor pump unit 6.1 General safety information Before inspecting the pump unit, read the Safety restarted. Contact the maintenance chapter 2 in this user manual. department. 6.2 What to listen and look for Drop in flow and/or pressure –...
  • Page 14 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Slowly unscrew and remove the bolts and gaskets from the inlet/outlet hoses or pipes, be careful about jets of water. Be aware that the system can be pressurized. Attach the lifting equipment to the pump unit.
  • Page 15 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Troubleshooting and scrapping criteria 8.1 General safety information Before inspecting the pump unit, it is necessary to read and understand this user manual, especially the Safety chapter 2. Electrical...
  • Page 16 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 16 | 180R9289 | AQ109686503106en-001102 © Danfoss | DCS-SGDPT/SI | 2023.01...
  • Page 17 Operation guide Appendices PAHT 256-308 Installation, Operation and Maintenance Manual hpp.danfoss.com 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...
  • Page 18 Table of Contents Pump instruction PAHT 256-308 (180R9257_AN228286503049en-000701) ....43 Electric motor manual (180R9230) ............51 Parts list PAHT (AX322445815902-000201) .
  • Page 19 Data sheet PAHT pumps PAHT 2-6.3/PAHT/10-12.5/PAHT 20-25/ PAHT 50-90 and PAHT 256-308 180R9289 | AQ109686503106en-001102 hpp.danfoss.com © Danfoss | 2023.01...
  • Page 20 PAHT 256-308 typical flow curves at max pressure ....... . .

  • Page 21: Benefits

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Below sectional drawing is an example of a PAHT pump. 1: Mounting flange 2: Shaft seal 3: Connecting flange 4: Port plate 5: Valve plate 6: Retainer plate...

  • Page 22: Technical Data

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Technical data 4.1 PAHT 2-12.5 Pump size 12.5 Code number PAHT 180B0031 180B0077 180B0030 180B0029 180B0032 180B0033 Housing material AISI 304 AISI 304 AISI 304 AISI 304...

  • Page 23: Paht 20-32

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 4.2 PAHT 20-32 Pump size Code number PAHT 180B0019 180B0020 180B0021 Housing material AISI 316 AISI 316 AISI 316 or higher or higher or higher Geometric cm³/rev displacement in³/rev...

  • Page 24: Paht 50-90

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 4.3 PAHT 50-90 Pump size Code number PAHT 180B0085 180B0086 180B0087 180B0088 180B0089 Housing material AISI 316 AISI 316 AISI 316 AISI 316 AISI 316 or higher...

  • Page 25: Paht 256-308

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 4.4 PAHT 256-308 Pump size Code number PAHT 180B1001 180B1002 Housing material AISI 316 AISI 316 or higher or higher Geometric cm³/rev displacement in³/rev 15.6 18.8 Pressure Min.

  • Page 26: Flow

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Flow The flow (Q ) at various pressure (p ) can be At zero pressure the true flow equals the calculated with the following equation: theoretical flow Q (th) –...

  • Page 27: Paht 10-12.5 Typical Flow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 5.2 PAHT 10-12.5 typical flow curves at max pressure l/min l/min PAHT 12.5 PAHT 12.5 PAHT 10.0 PAHT 10.0 PAHT 12.5 PAHT 12.5 PAHT 10.0 PAHT 10.0 ©...

  • Page 28: Paht 20-32 Typical Flow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 5.3 PAHT 20-32 typical flow curves at max pressure l/min l/min PAHT 32 PAHT 32 PAHT 25 PAHT 25 PAHT 20 PAHT 20 PAHT 32 PAHT 32...

  • Page 29: Paht 50-90 Typical Flow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 5.4 PAHT 50-90 typical flow curves at max pressure l/min l/min PAHT 90 PAHT 90 PAHT 80 PAHT 80 PAHT 70 PAHT 70 PAHT 63 PAHT 63...

  • Page 30: Paht 256-308 Typical Flow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 5.5 PAHT 256-308 typical flow curves at max pressure l/min l/min PAHT 308 PAHT 308 PAHT 256 PAHT 256 PAHT 308 PAHT 308 PAHT 256 PAHT 256 30 | 180R9289 | AQ109686503106en-001102 ©...

  • Page 31: Motor Requirements

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Motor requirements The required motor power can be calculated by using the following equation: n x V x p 600.000 x η P: Power (kW) M: Torque (Nm) η: Mechanical efficiency...

  • Page 32: Filtration

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Installation See the figure below for instructions on how to motor or combustion engine. mount the pump and connect it to an electric A: Pump B: Bell housing...

  • Page 33: Open-System Design

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 7.3 Open-system design inlet temperature is higher than the set value. Inlet line: Hoses: Dimension the inlet line to obtain mini- Always use flexible hoses (5) to minimize mum pressure loss (large flow, minimum vibrations and noise.

  • Page 34: Closed-System Design

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Closed-system design (not applicable Hoses: for PAHT 256-308) Always use flexible hoses (6) to minimize vibrations and noise. Inlet line: Inlet pressure: Dimension the inlet line to obtain mini-...

  • Page 35: Paht 10-12.5

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Dimensions and 8.1 PAHT 2-6.3 connections © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 35...

  • Page 36: Paht 20-32

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 8.2 PAHT 10-12.5 36 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...

  • Page 37: Paht 50-90

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 8.3 PAHT 20-32 © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 37...
  • Page 38 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 8.4 PAHT 50-90 38 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...

  • Page 39: Paht 256-308

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 8.5 PAHT 256-308 © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 39...

  • Page 40: Service

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet Service Danfoss PAHT pumps are designed for long Other factors that affect pump performance and periods of service-free operation to ensure low lifetime include: maintenance and life cycle costs. Provided that the pump is installed and operated according to •...
  • Page 41 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 41...
  • Page 42 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Data sheet 42 | 180R9289 | AQ109686503106en-001102 © Danfoss | DCS-SGDPT/SI | 2023.01...
  • Page 43 Instruction PAHT pumps PAHT 256/PAHT 308 180R9289 | AQ109686503106en-001102 hpp.danfoss.com © Danfoss | 2023.01...
  • Page 44 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction Table of Contents Table of Contents Identification ............... . . 44 System design .

  • Page 45: System Design

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction specifications described in item 5. The System design The design of the system must ensure that monitoring switch stop the pump at self-emptying of the pump during standstill is pressures lower than minimum pressure.

  • Page 46: Reversible Pumps

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction 2.3 Reversible pumps A good filtration is vital to ensure a long and If exposed to high pressure in the outlet while trouble free life of the pump.

  • Page 47: Direction Of Rotation

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction Mount the coupling flush or maximum 3.2 Direction of rotation 1mm offset from the pump shaft end. Ensure an air gap between coupling and Is indicated by means of an arrow on the pump pump flange of min.

  • Page 48: Protection From Too High Pressures

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction 3.4 Protection from too high pressures Parallel key The pump should be protected against too high pressure by means of a safety valve or a pressure relief valve.

  • Page 49: Recommended Service Intervals

    Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction Recommended procedure: Disconnect the water supply to the pump. Through the lower bleeding plug, empty the pump housing of water and close it again. is now protected against internal corrosion Connect the pump to a tank containing and frost.
  • Page 50 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Instruction 50 | 180R9289 | AQ109686503106en-001102 180R9289 | AQ109686503106en-001101 © Danfoss | DCS-SGDPT/SI | 2023.01...
  • Page 51 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Electric Motors Motor Manual hoyermotors.com M a n u a l 51 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...
  • Page 52 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Motor Manual General etc.) using suitable tools, never hit the drive components with a hammer as this will cause damage to the bearing. This manual concerns the following types of standard...
  • Page 53 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Motor Manual connections must be checked and tightened if necessary. The table values are based on an ambient temperature of Bearing size and type are specified on the rating plate. Motor 25°C.
  • Page 54 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Connection diagram Anschlußdiagram Anslutningdiagramm Forbindelsesdiagram Aansluitdiagram Connection Conexión Collegamento Schemat polacsen 54 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...
  • Page 55 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 55 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...
  • Page 56 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Hoyer Motors, Motor Manual, April 2019 Head Offices Branch Offices Denmark Germany Benelux Over Hadstenvej 42 · DK-8370 Hadsten Landsberger Straße 155 · 80687 München Vasteland 78 · 3011 BN, Rotterdam T +45 86 98 21 11 ·...
  • Page 57 Parts list PAHT pumps PAHT 2-6.3/PAHT 10-12.5/PAHT 20-32/ PAHT 50-90 and PAHT 256-308 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01 hpp.danfoss.com...
  • Page 58 General ................59 Spare parts list for PAHT 256-308 Serial number 03 or higher ......60 Exploded view for PAHT 256-308 Serial number 03 or higher .
  • Page 59 Parts list Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps General This parts list provides an overview of the • PAHT 256-308 content of the various service sets for the as well as exploded views of the pumps.
  • Page 60 Operation guide Parts list Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 12. Spare parts list for PAHT 256-308 Serial number 03 or higher Pos. Qty. Designation Material Designation Material Housing Duplex / PEEK Pin ø6 x 10 AISI 316 Bleeding plug G 1/4"...
  • Page 61 Parts list Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 13. Exploded view for PAHT 256-308 Serial number 03 or higher © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 61...
  • Page 62 Operation guide Parts list Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 14. Exploded view PAHT 256-308 Serial number up to and including 02 62 | 180R9289 | AQ109686503106en-001102 © Danfoss | 2023.01...
  • Page 63 Parts list Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 15. Tool set for PAHT 256-308 Designation Shaft bush, torpedo Press tool Mounting screw Allen key, 6 mm Adjustable pin wrench Combination wrench, 10 mm Combination wrench, 13 mm Nut, M8 x 6.5 x 13...
  • Page 64 Parts list Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps 64 | 180R9289 | AQ109686503106en-001102 © Danfoss | DCS-SGDPT/SI | 2023.01 AX322445815902-000201...
  • Page 65 Data sheet Product type Guide line. PAH / PAHT / PAHT C / PAHT G pumps Trouble shooting guide 180R9289 | AQ109686503106en-001102 180R9289 | AQ109686503106en-001102 hpp.danfoss.com © Danfoss | 2023.01 © Danfoss | 2023.01 | 65...
  • Page 66 Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Table of Contents Table of Contents Trouble shooting fish bone chart ............67 No flow/no pressure.

  • Page 67: Trouble Shooting Fish Bone Chart

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Trouble shooting fish bone chart © Danfoss | 2023.01 180R9289 | AQ109686503106en-001102 | 67...

  • Page 68: No Flow/No Pressure

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps No flow/no pressure Cause Remedy Comments 1.1 Dry running If no water comes out of the pump: Mount a low pressure switch in front of the (no water supply to the pump) pump and check its set point/ function.

  • Page 69: Reduced Flow/Reduced Pressure

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Reduced flow/reduced pressure Cause Remedy Comments 2.1 Wear on pump Typical signs of wear: 2.1.1 Dismantle the pump. Large internal leakage due to: 2.1.2 Check valve plate. Polished surface all over the swash plate.

  • Page 70: High Torque On Electric Motor

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps High torque on electric motor Cause Remedy Comments 3.1 Too high outlet pressure from pump 3.1.1 Check for blocked nozzles or a faulty Pressure changes due to flow restrictions. This adjusted relief valve.

  • Page 71: Noise From Pump

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Noise from pump Cause Remedy Comments 4.1 Air in fluid 4.1.1 Ensure that the entire inlet line is bled Small air bubbles will accumulate and create before starting up the system.

  • Page 72: Noise From Installation

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Noise from installation Cause Remedy Comments 5.1 Inlet/outlet connections (hoses/pipes) 5.1.1 Use flexible hoses at inlet/outlet connec- Non-flexible connections mounted directly on tions. the frame will cause even small pressure pulsations from pump and create vibrations in the system/plant.

  • Page 73: Typical Signs Of Wear

    Operation guide Guideline Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Typical signs of wear 6.1 Valve plate Picture 1 A normally worn valve plate has no marks/scratches but only a slightly polished surface. No scratches or marks should be felt. The surface must be flat and level.

  • Page 74: Port Plate

    To check this, please see item 6.1, picture 3. If the surface has any marks/scratches, it is worn/damaged and a new one is required. Please contact Danfoss High Pressure Pumps sales office for further infor- mation. 74 | 180R9289 | AQ109686503106en-001102 521B1475 | DKCFN.PI.012.R2.02...
  • Page 75 Service guide. Right and wrong Trouble shooting guide for water hydraulic systems 180R9289 | AQ109686503106en-001102 hpp.danfoss.com © Danfoss | 2023.01...
  • Page 76 Pump location Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Design Pump always to be placed below water Pump location above water surface surface level level will cause damage Choice of material Suction conditions Iron Rubber Copper...
  • Page 77 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Installation Assembly of coupling Impurities Never use force when assembling the Chips or other impurities in the system The coupling must be easy and simple coupling parts, as this will damage the...
  • Page 78 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Wiring Starting procedure Cleaning procedure 1. Fill cold water into the system via the return filter and Level indicator bleed the pump (Power Packs PPH 4 - 6.3 - 10 and 12.5 are self-bleeding) 2.
  • Page 79 Trouble shooting Open ended water systems No water supply Is the water supply ok? Is water supplied to the pump? Is water coming Is the electric motor of Is the water in the tank Lower inlet out of the tap? the pump unit rotating? very hot? Ie above 50 temperature or...
  • Page 80 Operation guide Installation, Operation and Maintenance Manual for PAHT 256-308 pumps Trouble shooting Closed water systems The system does not work Is there sufficient water in the tank? Is the water in the tank very hot? Ie above 50 Is the electric motor of...

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