Ensure Free Flow; Verify Setting Of Safety/Relief Valves; Flush The Pump; Bleed And Remove Air From The Pump - Danfoss APP W HC Series Operation Manual

Operation guide | Installation, Operation and Maintenance APP W HC 15 - 30 pumps
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5.12 Ensure free flow

Ensure free flow from the safety/relief valves 8
and 9 (schematic1, page 11) . A blocked safety/
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
specifications, 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 flow 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 .
180R9410 | AQ282628894589en-000801 | IOM APP W HC 15-30 Pumps | 01.2022

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 specified 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 filter condition

Evaluate contamination found in filter, replace
filter 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 offers commissioning and service at
system manufacturer's location . Rate quotes are
offered upon request .