Danfoss APP 0.6 User Manual

47
180R9267 / IOM APP 1.5-3.5 Appendices - v04 / 11.2013
Instruction Trouble shooting guide for APP and APP S 674 pumps
8
06.2013
5. Noise from installation
Cause Remedy Comments
5.1 Inlet/outlet connections (hoses/pipes) 5.1.1 Use exible hoses at inlet/outlet connec-
tions. Danfoss can provide exible hoses.
Please contact Danfoss High Pressure
Pumps sales oce for further information.
5.1.2 Mount the connections to the frame by a
vibration dampener mounting plate.
Non-exible connections mounted directly on
the frame will cause even small pressure
pulsations from pump and create vibrations in
the system/plant.
5.2 Length/dimension of inlet/outlet line 5.2.1 Increase pipe diameter and/or reduce the
number of bends.
Too small pipes or too many bends may create
too fast ow/turbulence through the pipes and
thus increase the noise level.
5.3 Hose stiness 5.3.1 Use a more exible hose. Danfoss can
provide exible hoses. Please contact
Danfoss High Pressure Pumps sales oce
for further information.
Too sti hoses cannot dampen the small
pressure pulsations from the pump, and
subsequently vibrations occur in the system/
plant.
5.4 Hoses/pipes mounted directly on frame 5.4.1 Mount the connections to the frame by a
vibration dampener mounting plate.
If the hoses are mounted directly on the frame,
the small pressure pulsations from the pump
can be transferred to the frame and the rest of
the system/plant.
5.5 Vibration dampener under the electric
motor
5.5.1 Mount a vibration dampener below the
motor/pump.
When no dampener is installed below the
electric motor, vibrations from the motor and
pump may be transferred to the frame and the
rest of the system/plant.
Instruction Trouble shooting guide for APP and APP S 674 pumps
9
06.2013
6. Typical signs of wear
6.1 Valve plate
Picture 1 A normally worn valve plate has no marks/scratches but only a slightly
polished surface.
No scratches or marks should be felt. The surface must be at and level.
Picture 2
Scratches
A worn valve plate has scratches, and/or a polished surface. Even small
scratches will give a loss of ow.
Picture 3 A good way to identify a worn valve plate is to hold a straight knife edge
over the valve plate. When holding it up to the light, it will be possible to
see any space between the knife edge and the valve plate. See picture 3.
If any light can be seen between the two arrows on the picture, the valve
plate is worn.
If any scratches or marks can be felt by running a ngernail over the surface,
the valve plate is worn.
The valve plate on picture 3 is highly damaged.

Danfoss APP 0.6 Specifications

General

Brand	Danfoss
Model	APP 0.6
Category	Water Pump
Language	English