Danfoss PAHT - Section 2

44 | 180R9288_AQ109686503100en-001301 © Danfoss | 2023.12
Operation guide Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
Table of Contents
1. Identication ..........................................................................45
2. System design .........................................................................45
2.2 Closed-system design .................................................................45
2.1 Closed water hydraulic systems, water .................................................45
23 Open-ended systems, water supply from tank ..........................................46
24 Open-ended systems with direct water supply..........................................46
2.5 Open-system design ...................................................................46
2.6 General guidelines for calculation of pressure losses ..................................46
2.7 General comments.....................................................................48
3. Building up the pump unit .............................................................48
3.1 Mounting ..............................................................................48
3.2 Direction of rotation ...................................................................49
3.3 Orientation ............................................................................49
3.4 Protection from too high system pressures .............................................49
3.5 Connections ...........................................................................50
3.5.1 PAHT 20-32 ............................................................................50
3.5.2 PAHT 50-90 ............................................................................50
4. Initial start-up..........................................................................51
5. Operation..............................................................................51
5.1 Water quality ..........................................................................51
5.2 Temperature ...........................................................................51
5.3 Pressure ...............................................................................52
5.4 Dry running............................................................................52
5.5 Disconnection .........................................................................52
5.6 Storage ................................................................................52
5.6.1 Water hydraulic systems, water recirculated.............................................52
5.6.2 Open-ended systems with water supply from tank. .....................................52
5.6.3 Open-ended systems with direct water supply. .........................................52
6. Service.................................................................................53
7. Recommended service intervals........................................................53
7.1 General information....................................................................53
7.2 Inspection of pump parts ..............................................................53
7.3 How to inspect the pump ..............................................................53