Danfoss APP 46 Installation, Operation And Maintenance Manual page 37

Operating guide
13. Service
© Danfoss | 2023.03
Installation, Operation and Maintenance APP 21-46 pumps
Warranty
Danfoss APP pumps are designed for long
operation, low maintenance and reduced
lifecycle costs.
Provided that the pump has been running
according to the Danfoss speci cations, Danfoss
guarantees 8,000 hours service-free operation,
however, max. 18 months from date of
production.
If Danfoss recommendations concerning
system-design are not followed, it will strongly
in uence the life of the APP pumps.
Other factors that a ect pump performance and
lifetime include:
- Running the pump at speed outside
speci cations.
- Supplying the pump with water at
temperature higher than recommended.
- Running the pump at inlet pressure outside
speci cations.
- Running the pump at outlet pressure
outside the speci cations.
Maintenance
Periodic inspections are required to ensure worn
parts (if any), are replaced in due time. Opera-
tional conditions such as water quality should be
taken into consideration when determining the
frequency of the inspections. Danfoss recom-
mends yearly inspections.
It is recommended to order the purpose-
designed tool kit.
Pump shutdown:
The APP pumps are made of Duplex/Super
Duplex materials with excellent corrosion
properties. It is, however, always recommended
to ush the pump with freshwater when the
system is shut down.
When stopping the pump for more than 1 day
ush the pump with permeate by rotating the
pump for 10 sec. Flushing through the ushing
valve of the pump without rotating the pump is
not enough for cleaning the inside of the pump.
The pump can be ushed with biocide like the
membranes. The biocide must be compatible
with the materials used in our pumps.
Repair assistance
In case of irregular function of the APP pump,
please contact Danfoss High Pressure Pumps.
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