12
180R9265 / IOM APP 16-22 Appendices - v02 / 01.2013
Data sheet APP 16-22
13.3 RO system with APP pump
1. Dimension the inlet line to obtain mini-
mum pressure loss (large ow, minimum
pipe length, minimum number of bends/
connections, and ttings with small
pressure losses).
2. Place an inlet lter (1) in front of the APP
pump (2). Please consult section 10,
“Filtration” for guidance on how to select
the right lter. Thoroughly clean pipes and
ush system prior to start-up.
3. Place a monitoring pressure switch (3) set
at min. inlet pressure between lter and
pump inlet. The monitoring switch must
stop the pump at pressures lower than
minimum pressure.
4. Use exible hoses (4) to minimize vibrations
and noise.
5. In order to eliminate the risk of damage
and cavitation, a positive pressure at the
inlet (5) is always to be maintained at min.
inlet pressure and max. inlet pressure.
Recommend to install safety valve or a
pressure relief valve (9) in order to avoid
high pressure peaks in case the pump stops
momen tarilly or spinning backwards.
6. For easy system bleeding and ushing, a
bypass non-return vavle (6) is integrated in
the APP pump.
7. A non-return valve (7) in outlet can be
installed in order to avoid backspin of the
pump. The volume of water in the mem-
brane vessel works as an accumulator and
will send ow backwards in case of the
pump stops momentarily.
8. A safety valve or a pressure relief valve (8)
can be installed in order to avoid system
damage as the Danfoss APP pump creates
pressure and ow immediately after
start-up, regardless of any counterpressure.
Note: If a non return valve is mounted in the
inlet line, a low pressure relief valve is also
required between non return valve and pump
as protection against high pressure peaks.
14. Service 14.1 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 produc-
tion.
If Danfoss recommendations concerning
system-design are not followed, it will strongly
inuence the life of the APP pumps.
14.2 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.
14.3 Repair
In case of irregular function of the APP, please
contact the Danfoss RO Solutions Sales
Organisation.
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