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Operation guide.
PAHT pumps
PAHT 20/25/32 and
PAHT 50/63/70/80/90
Operation, Installation and
Maintenance Manual
180R9288_AQ109686503100en-001301
© Danfoss | 2023.12
hpp.danfoss.com
| 1

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Summary of Contents for Danfoss PAHT

  • Page 1 Operation guide. PAHT pumps PAHT 20/25/32 and PAHT 50/63/70/80/90 Operation, Installation and Maintenance Manual 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 2: Table Of Contents

    Closed system (not applicable for PAHT 256-308) ........
  • Page 3 Table of Contents .................18 Data sheet PAHT 2-308 pumps (AI106586503085en-00090 1) ......19 Pump instruction PAHT 20-32 and PAHT 50-90 (AN101386502958en-000603) .
  • Page 4: Validity

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps This manual is valid for PAHT pumps with the following code numbers/serial numbers: Validity Code no. 180B0019 Code no. 180B0070 PAHT 20 PAHT 20 LP Serial no. XXXXXX03-XXX Serial no.
  • Page 5: Introduction

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Introduction General It is important that these instructions are The PAHT pumps and pump units are manufac- always available to the personnel concerned. tured by Danfoss A/S, and are sold and marketed by a net of authorized distributors world wide.
  • Page 6: Manufacturer And Customer Service Address

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Web: hpp.danfoss.com 1.3 Manufacturer and customer service Your local Danfoss pump distributor can be address: found on our homepage. Danfoss A/S High Pressure Pumps 1.4 Country speci c information Nordborgvej 81, 1.4.1 United Kingdom...
  • Page 7: Commissioning And Servicing The Unit

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps • Do not try to lift the pump unit manually; most of the pumps weigh more than It is always the system builders´ responsibility 20 kilos, see speci c weight for the pump that the system design does not cause any kind in the appendix 1, Data sheet.
  • Page 8: Filtration

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps It is recommended NOT to use the pump for other media than speci ed in the Data sheet. 3.7 Filtration (10µm absolute [β ≥ 5000]) Requirements are speci ed in appendix 1, Data sheet and appendix 2, Instruction.
  • Page 9: Return To Supplier

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 20-90 pumps Installation and commissioning 5.1 Important dimensions Physical dimensions and connections of the 5.3 Fluid temperature pump unit are described in appendix 1, Data Before start-up, the uid and pump housing sheet.
  • Page 11: Pre Mounting Checklist, Based On Danfoss Preferred System Designs

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 Ow

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps • Start high-pressure pump for 2 minutes, to 5.12 Ensure free ow Ensure free ow from relief valve (table 1, item make sure all air is out of the system.
  • Page 13: Operation Of Motor Pump Unit

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Very high temperatures – may indicate that Operation of motor one or more parts are damaged inside the pump unit pump. The pump must be stopped 6.1 General safety information...
  • Page 14: Disassembling And Assembling The Pump Unit

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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: Troubleshooting And Scrapping Criteria

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Troubleshooting and Electrical scrapping criteria hazard 8.1 General safety information Before inspecting the pump unit, it is necessary 8.4 Electrical failure to read and understand this user manual, If the wiring of the electric motor is incorrect or especially the Safety chapter 2.
  • Page 16 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 16 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 17 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Operation guide Appendices PAHT 20-90 Installation, Operation and Maintenance Manual © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 17 hpp.danfoss.com...
  • Page 18: Table Of Contents

    Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Data sheet PAHT 2-308 pumps (AI106586503085en-000901)......19 Table of Contents Pump instruction PAHT 20-32 and PAHT 50-90 (AN101386502958en-000603) .
  • Page 19: Data Sheet Paht 2-308 Pumps (Ai106586503085En-00090 1)

    Data sheet PAHT pumps PAHT 2-6.3/PAHT/10-12.5/PAHT 20-25/ PAHT 50-90 and PAHT 256-308 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 20: Introduction

    PAHT 256-308 typical ow curves at max pressure ....... . .
  • Page 21: Bene Ts

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Below sectional drawing is an example of a PAHT pump. 1: Mounting ange 2: Shaft seal 3: Connecting ange 4: Port plate 5: Valve plate 6: Retainer plate 7: Swash plate...
  • Page 22: Technical Data

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Technical data PAHT 2-12.5 Pump size 12.5 180B0031 180B0077 180B0030 180B0029 180B0032 180B0033 Code number PAHT AISI 304 AISI 304 AISI 304 AISI 304 AISI 304 AISI 304 Housing material cm³/rev...
  • Page 23: Paht 20-32 And Paht 20-32 Lp

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 20-32 and PAHT 20-32 LP Pump size 20 LP 25 LP 32 LP 180B0019 180B0070 180B0020 180B0071 180B0021 180B0072 Code number PAHT AISI 316 or AISI 316 or...
  • Page 24: Paht 50-90

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 50-90 Pump size 180B0085 180B0086 180B0087 180B0088 180B0089 Code number PAHT AISI 316 or AISI 316 or AISI 316 or AISI 316 or AISI 316 or Housing material...
  • Page 25: Paht 256-308

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 256-308 Pump size 180B1001 180B1002 Code number PAHT AISI 316 or higher AISI 316 or higher Housing material cm³/rev Geometric displacement in³/rev 15.6 18.8 Pressure Min. outlet pressure...
  • Page 26: Flow

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Flow The ow (Q ) at various pressure (p ) can be At zero pressure the true ow equals the calculated with the following equation: theoretical ow Q (th) –...
  • Page 27: Paht 10-12.5 Typical Ow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 10-12.5 typical flow curves at max pressure l/min PAHT 12.5 PAHT 10.0 PAHT 12.5 PAHT 10.0 © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 27...
  • Page 28: Paht 20-32 Typical Ow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 20-32 typical flow curves at max pressure l/min PAHT 32 PAHT 25 PAHT 20 PAHT 32 PAHT 25 PAHT 20 28 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 29: Paht 20-32 Lp Typical Ow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 20-32 LP typical flow curves at max pressure l/min PAHT G 32 LP PAHT G 25 LP PAHT G 20 LP 1200 1450 1700 1950 2200 2400 25,0...
  • Page 30: Paht 50-90 Typical Ow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 50-90 typical flow curves at max pressure l/min PAHT 90 PAHT 80 PAHT 70 PAHT 63 PAHT 50 PAHT 90 PAHT 80 PAHT 70 PAHT 63 PAHT 50 30 | 180R9288_AQ109686503100en-001301 ©...
  • Page 31: Paht 256-308 Typical Ow Curves At Max Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 256-308 typical flow curves at max pressure l/min PAHT 308 PAHT 256 PAHT 308 PAHT 256 © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 31...
  • Page 32: Motor Requirements

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Motor The required motor power can be calculated by requirements using the following equation: n x V x p 600.000 x η P: Power (kW) M: Torque (Nm) η: Mechanical e ciency...
  • Page 33: Installation

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps See the figure below for instructions on how to Installation mount the pump and connect it to an electric motor or combustion engine. A: Pump B: Bell housing C: Coupling...
  • Page 34: Open-System Design

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Open-system design Hoses: Always use flexible hoses (5) to minimize vibrations and noise. Inlet line: Dimension the inlet line to obtain Inlet pressure: minimum pressure loss (large flow, In order to eliminate the risk of...
  • Page 35: Closed-System Design

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Closed-system design (not Hoses: Always use flexible hoses (6) to applicable for PAHT 256-308) minimize vibrations and noise. Inlet line: Inlet pressure: Dimension the inlet line to obtain In order to eliminate the risk of...
  • Page 36: Dimensions And Connections

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Dimensions and 8.1 PAHT 2-6.3 connections 36 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 37: Paht 10-12.5

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 8.2 PAHT 10-12.5 © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 37...
  • Page 38: Paht 20-32

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 8.3 PAHT 20-32 38 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 39: Paht 50-90

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 8.4 PAHT 50-90 © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 39...
  • Page 40: Paht 256-308

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 8.5 PAHT 256-308 40 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 41: Service

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Danfoss PAHT pumps are designed for long We recommend that you inspect your pump Service periods of service-free operation to ensure after 8,000 hours of operation even if it is low maintenance and life cycle costs.
  • Page 42 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 42 | 180R9288_AQ109686503100en-001301 © Danfoss | DCS-SGDPT/SI | 2023.12 AI106586503085en-001001...
  • Page 43: Pump Instruction Paht 20-32 And Paht 50-90 (An101386502958En-000603)

    Instruction PAHT pump PAHT 20-32 and PAHT 50-90 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 44 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Table of Contents Identi cation ................45 System design .
  • Page 45: Identi Cation

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Identi cation Protective cap must be removed and thrown away before usage. Systems can be either: If it is unknown what the peak inlet pressure can System design be, then there should be a 15 barg (218 psig) •...
  • Page 46: Open-Ended Systems, Water Supply From Tank

    As the Danfoss PAHT pump begins to create pressure and ow immediately after Inlet lter: Install the inlet lter (1) in front of the PAHT start-up regardless of any counter pressure, pump (2). Please consult the Danfoss lter a pressure relief valve (7) should be data sheet for guidance on how to select installed to prevent system damage.
  • Page 47 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps SYSTEM General guidelines for calculation of pressure losses In smooth pipes and hoses In 90° bends © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 47...
  • Page 48: General Comments

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 2.7 General comments Pump suction line should be placed relatively Filtration A good ltration is vital to ensure a long and high above the tank bottom in order to prevent trouble free life of the pump.
  • Page 49: Direction Of Rotation

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps The direction of rotation is indicated by means of 3.2 Direction of rotation an arrow at the label of the pump. CCW (counter clock wise) CW (clock wise) 3.3 Orientation...
  • Page 50: Connections

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 3.5 Connections 3.5.1 PAHT 20-32 Inlet Outlet Bleeding XI Gauge port inlet* * There are two 1/4” ports on the inlet side for XO Gauge port oulet* optional mounting of ie switches for low pressure and temperature.
  • Page 51: Initial Start-Up

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps PAHT 50/63/70/80/90 Outlet (O) Inlet (I) Bleeding (C) Gauge 1/4” ports 1” BSPP with 1 ½” BSPP with M6 (width 1/4” BSPP with Thread, ISO 24 mm long thread...
  • Page 52: Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 5.3 Pressure 5.6.1 Water hydraulic systems, water recircu- The inlet pressure must be between min. 0 barg ( lated 0 psig) and max. 6 barg (87 psig). The use of the Disconnect the power pack from the pump outside this range can damage the pump.
  • Page 53: Service

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Service The Danfoss PAHT pumps are designed for long In our experience, poor ltration is the number periods of service-free operation to provide one cause of pump damage. customers with low maintenance and life cycle Other factors that a ect pump performance and costs.
  • Page 54 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 54 | 180R9288_AQ109686503100en-001301 180R9283_AN101386502958en-000603 © Danfoss | DCS-SGDPT/SI | 2023.12...
  • Page 55: Electric Motor Manual (180R9230)

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Electric Motors Motor Manual hoyermotors.com M a n u a l © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 55...
  • Page 56 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Motor Manual etc.) using suitable tools, never hit the drive components General with a hammer as this will cause damage to the bearing. This manual concerns the following types of standard...
  • Page 57 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 58 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Connection diagram Anschlußdiagram Anslutningdiagramm Forbindelsesdiagram Aansluitdiagram Connection Conexión Collegamento Schemat polacsen 58 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 59 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 59...
  • Page 60 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 61: Parts List Paht (Ax322445815902En-000201)

    Parts list PAHT pumps PAHT 2-6.3/PAHT 10-12.5/PAHT 20-32/ PAHT 50-90 and PAHT 256-308 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 62 Exploded view for PAHT 20-32........
  • Page 63 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Spare parts list for PAHT 20-32 Pos. Qnt. Designation Material Shaft bush, topedo Press bush Housing AISI 316 Pin Ø4 x 14 AISI 304 Screw M8 x 16 AISI 304 O-ring Ø102 x 3...
  • Page 64 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Exploded view for PAHT 20-32 64 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 65 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Spare parts list for PAHT 50-90 Pos. Qnt. Designation Material Shaft bush, torpedo Press bush Housing AISI 316 Pin ø4 x 14 AISI 304 Screw M8 x 20 AISI 304 O-ring ø135 x 3...
  • Page 66 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Exploded view for PAHT 50-90 66 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12...
  • Page 67 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 67...
  • Page 68 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 68 | 180R9288_AQ109686503100en-001301 AX322445815902en-000202 © Danfoss | DCS-SGDPT/SI | 2023.12...
  • Page 69: Trouble Shooting Guide For Pah, Paht, Paht G, Paht 674 And Pah F Pumps

    Guide line. PAH / PAHT / PAHT C / PAHT G / PAHT 674 / PAH F pumps Trouble shooting guide 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 70 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Table of Contents Table of Contents Trouble shooting sh bone chart ............71 No ow/no pressure.
  • Page 71: Trouble Shooting Sh Bone Chart

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Trouble shooting sh bone chart © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 71...
  • Page 72: No Ow/No Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps No ow/no pressure Cause Remedy Comments If no water comes out of the pump: Mount a low pressure switch in front of the 1.1 Dry running (no water supply to the pump) pump and check its set point/ function.
  • Page 73: Reduced Ow/Reduced Pressure

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Reduced ow/reduced pressure Cause Remedy Comments 2.1.1 Dismantle the pump. 2.1 Wear on pump Typical signs of wear: Large internal leakage due to: 2.1.2 Check valve plate. Polished surface all over the swash plate.
  • Page 74: High Torque On Electric Motor

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps High torque on electric motor Cause Remedy Comments 3.1.1 Check for blocked nozzles or a faulty Pressure changes due to ow restrictions. This 3.1 Too high outlet pressure from pump adjusted relief valve.
  • Page 75: Noise From Pump

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Noise from pump Cause Remedy Comments 4.1.1 Ensure that the entire inlet line is bled Small air bubbles will accumulate and create 4.1 Air in uid before starting up the system.
  • Page 76: Noise From Installation

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Noise from installation Cause Remedy Comments 5.1.1 Use exible hoses at inlet/outlet connec- Non- exible connections mounted directly on 5.1 Inlet/outlet connections (hoses/pipes) tions. the frame will cause even small pressure pulsations from pump and create vibrations in the system/plant.
  • Page 77: Typical Signs Of Wear

    Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 at and level.
  • Page 78: 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 o ce for further infor- mation. 78 | 180R9288_AQ109686503100en-001301...
  • Page 79 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 79...
  • Page 80 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 80 | 180R9288_AQ109686503100en-001301 © Danfoss | DCS-SGDPT/SI | 2023.12...
  • Page 81: Right And Wrong - Trouble Shooting Guide For Water Hydraulic Systems (180R9042)

    Service guide. Right and wrong Trouble shooting guide for water hydraulic systems 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12 hpp.danfoss.com...
  • Page 82 Pump location Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Pump always to be placed below water Pump location above water surface surface level level will cause damage Design Choice of material Suction conditions Iron Rubber Copper...
  • Page 83 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 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 84 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Starting procedure Wiring Cleaning procedure 1. Fill cold water into the system via the return lter and Level indicator bleed the pump (Power Packs PPH 4 - 6.3 - 10 and 12.5 are self-bleeding) 2.
  • Page 85 Trouble shooting Open ended water systems No water supply Is the water supply ok? Is water supplied to the pump? Lower inlet Is water coming Is the water in the tank Is the electric motor of temperature or out of the tap? very hot? Ie above 50 the pump unit rotating? provide better cooling...
  • Page 86 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps Trouble shooting Closed water systems The system does not work Is there su cient water in the tank? Is the electric motor of Is the water in the tank...
  • Page 87 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps © Danfoss | 2023.12 180R9288_AQ109686503100en-001301 | 87...
  • Page 88 Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps 88 | 180R9288_AQ109686503100en-001301 © Danfoss | DCS-SGDPT/SI | 2023.12...

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