48 | 180R9288_AQ109686503100en-001301
© Danfoss | 2023.12
Operation guide
Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
2.7 General comments
Filtration
A good filtration is vital to ensure a long and
trouble free life of the pump.
When selecting a filter or strainer, please note
that filter materials should be compatible with
water, i.e. should neither corrode or dissolve. Also
be aware of the electrochemical series of the
applied materials.
•
Main filter must have a fineness of 10 µm
abs. β10 >5000.
•
The pressure loss across the filter should be
monitored.
Please contact Danfoss High Pressure Pumps for
further filter details.
Water tank
Must be made of corrosion-proof material such
as stainless steel or plastic and must be sealed to
prevent entrance of impurities from the environ-
ment.
Automatic pressure equalization between tank
and surroundings must be ensured.
Inlet from the water supply (the return line) and
inlet to the pump should be placed in opposite
ends of the tank to calm and deaerate the water,
and to ensure optimum opportunity for particles
to settle.
Pump suction line should be placed relatively
high above the tank bottom in order to prevent
settled particles from being led into the pump.
We recommend a separation (“wall”) to separate
the inlet from the outlet end of the tank.
Monitoring
It is recommended to continuously monitor the
following conditions:
•
Water level (if a tank is used)
•
Filter contamination
•
Pressure (inlet side of the pump)
•
Temperature (inlet side of the pump)
3.
Building up the pump
unit
3.1 Mounting
If alternative mounting is desired, please contact
Danfoss High Pressure Pumps.
Choose proper tolerances to ensure an easy
mounting of the elastic coupling without use of
tools.
Please take care to observe the recommended
length tolerances of the chosen coupling, as an
axial force on the pump shaft will prevent the
pump from generating pressure (and over time
damage the pump).
min. 3 mm
m
ax 0
.2
5m
m
m
ax
. 0
.0
1 i
n
ch
A: Elastic coupling
B: Bell housing
C: Motor shaft
In
Out
