Danfoss PAH Series User Manual

Data sheet PAH 2/4/6.3, PAH 10/12.5, PAH 20/25/32 and PAH 50/63/70/80/100 pumps
26 | 180R9379 | AQ188686503004en-000801 | PAH 2-12.5
© Danfoss | DCS (im) | 2022.07
7. Installation See the gure below for instructions on how to
mount the pump and connect it to an electric
motor or combustion engine.
If alternative mounting is required, please
contact your Danfoss sales representative for
further information.
Note: Do not add any axial or radial loads to the
pump shaft.
7.1 Filtration
Proper ltration is crucial for the performance,
maintenance and warranty of your pump.
Protect your pump, and the application in which
it is installed, by always ensuring that ltration
specications are met, and by always changing
lter cartridges according to schedule.
Since water has very low viscosity, Danfoss PAH
pumps have been designed with very narrow
clearances in order to control internal leakage
rates and improve component performance. To
minimize wear in the pump, it is therefore
essential to lter inlet water properly.
The main lter must have a ltration eciency
of 99.98% at 10 μm. We strongly recommend
that you always use precision depth lter
cartridges rated 10 μm abs. β
10
≥ 5,000.
Please note that we do not recommend bag
lters or string-wound lter cartridges, which
typically have only 50% ltration eciency. This
means that out of 100,000 particles that enter
such lters, 50,000 particles pass right through
them; compare this to precision depth lters that
are 99.98% ecient, and only allow 20 of the
same 100,000 particles to pass through.
For more information on the importance of
proper ltration, including explanation of
ltration principles, denitions, and guidance on
how to select the right lter for your pump,
please consult our Filtration information and
specications (Danfoss document number
521B1009).
7.2 Noise
Since the pump unit is mounted on a frame, the
overall noise level can only be determined for a
complete system. To minimize vibrations and
noise throughout the system, it is therefore very
important to mount the pump unit correctly on a
frame with dampers and to use exible hoses
rather than metal pipes where possible.
The noise level is inuenced by:
• Pump speed:
High rpm makes more uid/structure-
borne pulsations/vibrations than low rpm.
• Discharge pressure:
High pressures make more noise than low
pressures.
• Pump mounting:
Rigid mounting makes more noise than
exible mounting because of the structure-
borne vibrations. Be sure to use dampers
when mounting.
• Connections to pump:
Pipes connected directly to the pump make
more noise than exible hoses because of
structure-borne vibrations.
• Variable frequency drives (VFDs):
Motors regulated by VFDs can produce
more noise if the VFD does not have the
right settings.
A: Flexible coupling
B: Bell housing
C: Motor shaft

Danfoss PAH Series Specifications

General

Brand	Danfoss
Model	PAH Series
Category	Water Pump
Language	English