8 | 180R9289 | AQ109686503106en-001102
© Danfoss | 2023.01
Operation guide
Installation, Operation and Maintenance Manual for PAHT 256-308 pumps
3.7 Filtration
(10µm absolute [β
10
≥ 5000])
Requirements are specified in appendix 1, Data
sheet and appendix 2, Instruction.
Danfoss recommends not to build a filter bypass
function or use filters with an integrated bypass.
If the above recommendation is not followed the
warranty for the pump will automatically
become void.
It should be possible to monitor the condition of
the filter via the differential/delta pressure across
the filter.
Using insufficient filtration or a filter bypass
can cause a failure or decreased service life of
the pump.
3.8 Properties of water
It is recommended NOT to use the pump for
other media than specified in the Data sheet.
3.9 Air bubbles
Large bubbles in a pressurised system can result
in damage to piping, equipment and the pump.
All air must be bleeded from both the low-
pressure and high-pressure side before the
system is pressurised. Special consideration
should be given in order to minimize air bubbles
in the feed flow. Air bubbles can cause cavitation.
3.10 Chemicals
The pumps should not be exposed to any
chemicals that can result in damage to piping,
equipment and internal parts of the pump.
4.
Arrival inspection,
transportation,
handling, lifting and
storage
4.1 Arrival inspection
The pump is packed in a cardboard or wood box
with plugs in the port connections to protect the
pump from damage during transportation.
When the shipment has arrived it is important to
check the pump for any damages. The name
plate/type designation must be in accordance
with the delivery note and your order.
In case of damage and/or missing parts, a report
should be documented and presented to the
carrier at once.
4.2 Warning
Before any lifting operation is performed,
environmental conditions must be taken into
consideration (Ex-rated areas, wind speed, wet/
dry conditions, lifting height, etc.).
4.3 General safety information
Personnel involved in lifting and transporting the
equipment (see Safety, chapter 2) must be
trained in handling and safety procedures when
lifting heavy loads. Many of the pumps and
pump units weigh more than 20 kilos, which
requires lifting slings and suitable lifting devices;
e.g. an overhead crane or industrial truck to be
used as minimum.
4.4 Transport and handling
Small pumps which have a weight below 20 kilos
(weight can be found in appendix 1, Data sheet)
can be handled by hand if they are not mounted
together with an electric motor. The weight of a
small pump with a motor will be above 20 kilos.
