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Danfoss Manuals
Water Pump
PAHT 4
Operation, installation, and maintenance manual
Danfoss PAHT 4 Operation, Installation, And Maintenance Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Section 1
Table of Contents
Validity
Introduction
General
Symbols
Manufacturer and Customer Service Address
Country Speci C Information
United Kingdom
Safety
General Information
Preferred System Design
Space Requirement
Dimension Drawings
Noise and Vibration
Electric Motor Data
Approved Applications and Operational Limits for the Pumps
Adhere to the Following Important Points
Commissioning and Servicing the Unit
Application Range
In Case of Doubt
Technical Data
Filtration
Properties of Water
Air Bubbles
Arrival Inspection
Warning
General Safety Information
Transport and Handling
Chemicals
Return to Supplier
Storage
Fluid Temperature
Local Regulations
Electrical Data
Cleanliness
Installation and Commissioning
Important Dimensions
Pre Mounting Checklist, Based on Danfoss Preferred System Designs
Lifting and Positioning
Mount the DI Erent Equipment
Electrics
Instrumentation
Connections
Open System
Instruct Operator and Maintenance Personnel
Check the Lter Condition
Closed System (Not Applicable for PAHT G 256-308)
Verify Setting of Safety/Relief Valves
Commissioning
Verify Direction of Rotation
Bleed and Remove Air from the Pump
Ensure Free Ow
Service and Inspection Interval for the Pump
Shut down of the System
Operation of Motor Pump Unit
Maintenance and Service of the Pump Unit
What to Listen and Look for
General Safety Information
Disassembling and Assembling the Pump Unit
Assembling the Pump Unit
Procedure for Mounting the Pump Back Onto Electric Motor
Getting the Pump Unit Back into Operation
Storage of the Pump
Troubleshooting and Scrapping Criteria
General Safety Information
Operational Conditions Which Can Cause Pump Failures
Mechanical Failure
Electrical Failure
Responsibility
Scrapping Criteria
Appendices
Section 2
Table of Contents
Application Examples
Bene Ts
Paht 2-12.5
Technical Data
Paht 20-32
Paht 50-90
Paht 256-308
Flow
PAHT 2-6.3 Typical Ow Curves at Max Pressure
PAHT 10-12.5 Typical Ow Curves at Max Pressure
PAHT 20-32 Typical Ow Curves at Max Pressure
PAHT 50-90 Typical Ow Curves at Max Pressure
PAHT 256-308 Typical Ow Curves at Max Pressure
Motor Requirements
Filtration
Installation
Noise
Open-System Design
Closed-System Design
Paht 2-6.3
Paht 20-32
Paht 50-90
Paht 256-308
Service
Section 3
Closed-System Design
System Design
Open-System Design
General Comments on
General Guidelines for Calculation of Pressure Losses
Building up the Pump Unit
Direction of Rotation
Mounting
Orientation
Connections
Protection from too High Pressures
Disconnection
Dry Running
Initial Start-Up
Operation
Pressure
Storage
Temperature
Water Hydraulic Systems, Water Recirculated
Water Quality
General Information
How to Inspect the Pump
Inspection of Pump Parts
Open-Ended Systems with Direct Water Supply
Open-Ended Systems with Water Supply from Tank
Recommended Service Intervals
Service
Section 4
Spare Parts List for PAHT 2
Exploded View for PAHT 10-12.5
Exploded View for PAHT 2
Exploded View for PAHT 3.2-6.3
Exploded View for PAHT 20-32
Exploded View for PAHT 50-90
Spare Parts List for PAHT 256-308 Serial Number 03 or Higher
Exploded View for PAHT 256-308 Serial Number 03 or Higher
Tool Set for PAHT 256-308
Troubleshooting Guide
Section 5
Trouble Shooting Sh Bone Chart
No Ow/No Pressure
Reduced Ow/Reduced Pressure
High Torque on Electric Motor
Noise from Pump
Noise from Installation
Typical Signs of Wear
Valve Plate
Port Plate
Swash Plate
Installation
Starting Procedure
Troubleshooting
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Operation guide
PAHT pumps
PAHT 2/3.2/4/6.3/10 and 12.5
Operation, Installation and
Maintenance Manual
180R9287_AQ073186503097en-001004
© Danfoss | 2023.09
hpp.danfoss.com
| 1
Table of
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Chapters
Section 1
2
Section 2
20
Section 3
44
Section 4
60
Section 5
78
Table of Contents
Troubleshooting
Troubleshooting and scrapping criteria
15
Troubleshooting Guide
77
Trouble shooting sh bone chart
79
Troubleshooting
93
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