Operation Of Pump Unit; General Safety Information; What To Listen And Look For; Maintenance And Service Of The Pump Unit - Danfoss APP W HC Series Operation Manual

Operation guide | Installation, Operation and Maintenance APP W HC 15 - 30 pumps
6. Operation of pump
unit
7. Maintenance and
service of the pump
unit

6.1 General safety information

Before inspecting the pump unit, read the Safety
chapter 2 in this user manual .

6.2 What to listen and look for

If one or more of the following examples are
observed, please act as indicated:
A) Loose bolts – check all bolts and, if
necessary, contact the maintenance
department in order to have all bolts
tightened to the specified torque(s) .
B) Leakage – if a small leakage from the bell
housing is observed . Contact the mainte-
nance department .
C) Leakage – if there is a large leak, the unit
should be stopped immediately . Contact
the maintenance department .
D) High frequency tones – safety/relief valves
are either damaged or running very close
to their design pressure, stop the unit
immediately . Contact the maintenance
department .
E) Increased noise or vibration – requires the
unit to be stopped immediately . Contact
the maintenance department .
F) Very high temperatures – may indicate that
one or more parts are damaged inside the
pump . The pump must be stopped
immediately and inspected before it is
restarted . Contact the maintenance
department .
7.1

General safety information

Before servicing the pump unit, it is necessary to
read and understand this user manual, especially
the Safety, chapter 2 . Remember to wear suitable
safety equipment according to Safety, chapter 2 .
7.2 Service and inspection interval for the
pump
Maintenance and service intervals are depending
on the cleanliness level of the water, hydraulic
load and temperature of the pump unit . The
most important parameter is the filtration of the
water .
See the section Service and warranty in the
appendix 1, Data sheet, in appendix 2, Instruc-
tion and appendix 4, Instruction for recom-
mended service intervals .
For spare parts and service tools, please see
appendix 3, Parts list .
180R9410 | AQ282628894589en-000801 | IOM APP W HC 15-30 Pumps | 01.2022
G) Drop in flow and/or pressure – may indicate
wear on one or more parts inside the
pump . The pump must be stopped
immediately and inspected before it is
restarted . Contact the maintenance
department .
H) Other observations or troubles, please see
appendix 7, Right and Wrong or appendix
6, the Trouble shooting guide .
Both appendices give good advises
regarding design, installation, wiring and
troubleshooting .
See also service and warranty section in
appendix 1, Data sheet and appendix 2,
Instruction .
If the pump is not stopped for inspection as
recommended, it can lead to damage of the
pump or break-down . See also service and
warranty section in the appendix 1, Data sheet,
in appendix 2, Instruction or appendix 4,
Instruction for recommended service intervals .
Danfoss offers service of the pump at the system
manufacturer's location as well as we offer
training in how to service the pump . Quotes are
offered upon request .
Danfoss recommends simultaneously to check
the filter and membrane condition and to
evaluate contamination; filter and membrane
elements must be replaced if necessary .
Danfoss offers service of the pump at the system
manufacturer's location and training in how to
service the pump . Quotes are offered upon
request .

7.3 Shut down of the system

A) Open the pressure valves at the brine site
to release the pressure .
B) Stop the high-pressure pump .
C) Stop the feed pump .
D) Switch off the safety circuit breaker for
both the high-pressure pump, feed pump
and VFD and lock them . Only personnel
servicing the pump unit should be able to
unlock/activate the switch again .
E) Open bleeding and drain plugs . Wait until
the pump and system are emptied for
water .
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