180R9346 | AQ240486503020en-001702 | 53© Danfoss | 2023.03
Operation guide Installation, Operation and Maintenance APP 53-92 pumps
6.5 Storage
When preparing the pump for long-term storage
at temperatures below the freezing point, ush
the pump with an anti-freeze medium type
monopropylene glycol to prevent internal
corrosion or frost in the pump.
For further information on anti-freeze media,
please contact Danfoss High Pressure Pumps.
Recommended procedure:
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 containing
anti-freeze additive. Connect a hose to the
inlet port of the pump and via another
hose return the ow from the outlet port to
the tank with antifreeze additives.
Storage temperature:
Min. -40°C to max. +70°C
(Min. -40°F to max. +158°F)
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.
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 specications, 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
inuence the life of the APP pumps.
Other factors that aect pump performance and
lifetime include:
- Insucient ltration
- Insucient bleeding and venting
- Running the pump at speed outside
specications.
- Supplying the pump with water at
temperature higher than recommended.
- Running the pump at inlet pressure outside
specications.
- Running the pump at outlet pressure
outside the specications.
- Wrong direction of rotation.
Maintenance
After 8,000 hours of operation it is strongly
recommended to inspect the pump and change
any worn parts, e.g. pistons and shaft
seal. This is done in order to prevent a potential
breakdown of the pump. If the parts are not
replaced, more frequent inspection is
recommended according to our guidelines.
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 ashing
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 pump (materials
can be found in the parts list in the Service guide
and Operating manual).
Repair
In case of irregular function of the APP pump,
please contact Danfoss High Pressure Pumps.
7. Service and warranty
Storage:
Storage of pump that have been in operation:
For shorter periods of storage ush the pump
with permeate by rotating the pump for 10 sec.
empty permeate and store.
For long term storage (more than 2 months)
Danfoss recommends servicing the product and
clean any biological growth of the surfaces. Store
the pump without water inside.
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