Danfoss APP 1.0 Installation, Operation And Maintenance Manual page 56

Instruction
1. No flow/no pressure
Cause
1.1 Dry running
(no water supply to the pump)
1.2 Pump reversing
(electric motor is running the wrong direction,
i.e. counter-clockwise)
1.3 No rotation of electric motor
1.4 No rotation of pump
1.5 Axial load on pump shaft
(may cause high internal leakage)
Only applying to APP 0.6 to APP 3.5 and APP 21
to APP 26 only
1.6 Pump damage
(the internal parts may be damaged)
38
Trouble shooting guide for APP pumps
Remedy
If no water comes out of the pump:
1.1.1 Check that inlet valve is open.
1.1.2 Check that booster pump is running.
1.2.1 Change the phase on the electric motor to
make it run clockwise.
WARNING:
- The pumpmust not run withoutwater
formore than a few seconds.
- If the pump takes in water from the high-
pressure outlet line, it builds up pressure in
pump housing and will eventually break
down.
1.3.1 Check that main switch is switched on.
1.3.2 Check the electricity at the facility.
1.3.3 Ensure that motor relay is switched on.
1.3.4 Ensure that fuse is not blown.
1.3.5 Ensure that booster pump is started.
1.3.6 Check that the monitor switches are
working correctly.
1.3.7 Disconnect pump from electric motor and
check that the motor is capable of running
with no load.
1.4.1 Ensure that coupling between electric
motor and pump is connected.
1.4.2 Check if coupling is damaged.
1.4.3 Check that electric motor is sized correctly
1.4.4 Check that the electrical installation is
correctly sized.
1.4.5 Contact Danfoss Sales office for guidelines
in how to troubleshoot internal pump
parts.
1.5.1 Ensure that the air gap between the two
coupling parts is min 5 mm. It should
always be possible to move the plastic part
on the coupling at least 3 mm.
1.6.1 Contact Danfoss sales office for guidelines
in how to troubleshoot internal pump
parts.
180R9262 / IOM APP 0.6-1.0 Appendices - v02 / 12.2012
Comments
Mount a low pressure switch in front of the
pump and check its set point/ function. The low
pressure switch ensures that the pump does
not start until the inlet pressure has reached-
minimuminlet pressure (see Data sheet)
Rotation direction for the APP pump is shown
by an arrow on the sticker on the side of the
pump.
If motor-type relay or the electrical fuse is
blown, check that electric motor is sized
correctly.
To ensure easymounting of the flexible
coupling without using tools, the tolerances
must be dimensioned accordingly.
WARNING:
Any axial and/or radial loads on the shaft
must be avoided. Any axial or radial load will
cause breakdown.
A B
A Flexible coupling
B Bell housing
C Motor shaft
Instructions on internal elements
180R9092/180R9085 for APP 0.6-1.0
180R9091/180R9147/180R9089 for APP 1.5-3.5
180R9093/180R9090 for APP 5.1-10.2
180R9228/180R9227 for APP 11-13 and APP 16-22
180R9121/180R9139 for APP 21-38
– are available on www.ro-solutions.com.
C