Instruction
Pump instruction PAH / PAHT 2-12.5
41
© Danfoss | DHS (im) | 2022.07
180R9379 | AQ188686503004en-000801 | PAH 2-12.5
|
5.6.2 Open-ended systems with water supply
from tank.
1 .
Empty the tank of water and empty the
pump housing through the lower bleeding
plug . When the pump is empty, retighten
the plug .
2 .
Through the upper bleeding plug, fill the
pump housing with anti-freeze medium .
Pour anti-freeze medium into the tank .
Connect a hose to the outlet of the pump
and lead the other end of the hose back to
tank .
3 .
Quickly start and stop the pump . Make sure
that the pump does not run dry .
The pump is now protected against internal
corrosion and frost .
5.6.3 Open-ended systems with direct water
supply.
1 .
Disconnect the water supply to the pump .
2 .
Through the lower bleeding plug, empty
the pump housing of water and close it
again .
3 .
Connect the pump to a tank of e .g . 25 litre/
6 gal . of anti-freeze additive . Connect a
hose to the inlet port of the pump and via
another hose return the flow from the
outlet port port to the tank with anti-freeze
additives .
4 .
Quickly start and stop the pump . Make sure
that the pump does not run dry .
The pump is now protected against internal
corrosion and frost .
7.1 General information
This guideline provides information on the
recommended service intervals for the PAHT
pumps . The recommendation is based upon
good engineering practice and on experience
gained from operation even under extreme
conditions .
The recommendation is for guidance only .
7.2 Inspection of pump parts
Danfoss recommends to inspect the pumps after
8,000 hours . Typical signs of wear are seen on the
contact/sliding surfaces in the pumps . If the
pumps must run for additional 8,000 hours, the
following parts will have to be inspected:
•
Pistons
•
Retainer plate, ball and bearing
•
Valve plate
•
Port plate
•
Sealings
If there are any wear marks on the parts they
need to be replaced .
If service inspection due to the application is
complicated, the plant operator can decide to
extend the service interval by evaluating the
following deviations:
•
Sound - does the pump have any unusual
sounds?
•
Electric motor power consumption and
speed compared with measurement made
in the past .
•
Pressure/flow according to measurements
made in the past?
We advise that the above mentioned parameter
during the extended service interval is inspected
for every 500-2,000 hours beyond the 8,000
hours . The pump must in any case be inspected
after maximum 16,000 hours or 2 years .
7.3 How to inspect the pump
Service manuals are available on the internet
www .danfoss .high-pressurepumps .com
7.
Recommended service
intervals
6. Service
The Danfoss PAHT pumps are designed for long
periods of service-free operation to provide
customers with low maintenance and life cycle
costs . Provided that the pumps are installed and
operated according to Danfoss specifications, the
Danfoss PAHT pumps typically run 8,000 hours
between service routines . However, the service
schedule for your PAHT pump may vary accord-
ing to the application and other factors .
The life of a pump may be greatly shortened if
Danfoss recommendations concerning system
design and operation are not followed .
In our experience, poor filtration is the number
one cause of pump damage .
Other factors that affect pump performance and
lifetime include:
•
running the pump at speeds outside
specifications
•
supplying the pump with water at temper-
atures higher than recommended
•
running the pump at inlet pressures
outside specifications
•
running the pump at outlet pressures
outside the specifications .
Содержание PAH 2
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