Danfoss APP 16-22 Operation Manual page 12

Operation guide
12 | 180R9265 | AQ115586503035en-001003
Installation, Operation and Maintenance APP 16-22 pumps
5.12 Ensure free ow
Ensure free ow from the safety/relief valves 8
and 9 (schematic1, ). A blocked safety/
page 11
relief valve can cause excessive build-up of
pressure and thereby cause dangerous situations
and damage to the whole system.
5.13 Verify setting of safety/relief valves
Make sure, the safety/relief valves 8 and 9 are
placed correctly.
Check the pressure settings on the name plates
of the safety/relief valves. If they are within
speci cations, you can continue.
5.14 Flush the pump
Fully open the pressure valve at the brine outlet.
Close all the bleeding and draining plugs on the
high-pressure pump.
Start the feed pump and ensure free ow to the
high-pressure pump.
5.15 Bleed and remove air from the pump
Open the bleeding plugs. Keep the plugs open
until the high-pressure pump is bleeded.
5.16 Verify direction of rotation
The direction of rotation must always follow the
arrow. The arrow is placed on the pump or pump
unit.
Check the direction of rotation before mounting
the pump.
Unlock the safety circuit breaker. Start the motor
for 1 second and observe the direction of
rotation either looking at the fan of the motor or
the coupling through the inspection hole in the
bell housings (not available on all bell housings).
If the motor is turning the wrong direction,
switch two phases in the connection box of the
motor or reprogram the direction in VFD.
When the motor is turning in the right direction,
the pump can be mounted.
5.17 Commissioning
• Close all the bleeding and draining plugs.
• Open the pressure valve at the brine site.
• Switch the safety circuit breaker on for both
motor(s) and VFD(s).
• Start the feed pump.
• Start the high-pressure pump.
• If a VFD or a soft starter is used, a ramp up
time of minimum 10 seconds is required to
avoid damage of the pump.
• Monitor the inlet and outlet pressure of the
high-pressure pump and look for leakages.
• Check the function of the pressure
indicators by slowly closing the valves. The
pump unit should stop when the minimum
inlet pressure and maximum outlet
pressure has been reached.
• Adjust the pressures to the speci ed inlet
and outlet pressure for the system and let
the pump unit run until the electric motor
and pump temperature is stable.
• If the system is running within the system
design limits, the system is released for
operation.
5.18 Check the lter condition
Evaluate contamination found in lter, replace
lter elements, if necessary.
5.19 Instruct operator and maintenance
personnel
Before using the pump/pump unit, the personnel
must be instructed in using the pump/pump
unit, its function, components, documentation
and safety.
Danfoss o ers commissioning and service at
system manufacturer's location. Rate quotes are
o ered upon request.
© Danfoss | 2023.03