Troubleshooting And Scrapp W Hcing Criteria; General Safety Information; Operational Conditions Which Can Cause Pump Failures; Mechanical Failure - Danfoss APP W HC Series Operation Manual

Operation guide | Installation, Operation and Maintenance APP W HC 15 - 30 pumps
8. Troubleshooting and
scrapping criteria

8.1 General safety information

Before inspecting 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 .
8.2 Operational conditions which can cause
pump failures
The following conditions can cause a pump
failure :
• The pump is running dry .
• The inlet pressure is too high .
• The inlet pressure is too low .
• The temperature of the fluid is too high .
• The ambient temperature is too high .
• The pump is running against a blocked
port/closed manual valve .
• The pump is operating at a pressure out of
specification .
• The pump is running with a non-specified/
approved fluid .
• The pump is running in the wrong
direction .
• The filtration is insufficient .
• The pump is not being serviced according
to Danfoss specifications (end of life) .
• There is excessive mechanical load on the
shaft coupling and piping .

8.3 Mechanical failure

If the pump is running dry, the temperature will
quickly increase which can cause burns .
If there is any leakage at start-up or during
operation, a high-pressure jet can cause eye or
skin damage .
Leakage can result in flooding, which can cause
slipping, tripping or falling .
180R9410 | AQ282628894589en-000801 | IOM APP W HC 15-30 Pumps | 01.2022
If water is leaking into the electric motor; it can
cause electric shock, fire, short circuit or even
death . When mounting the pump vertically
always mount the motor above the pump to
avoid water leaking into the electric motor .

8.4 Electrical failure

If the wiring of the electric motor is incorrect or
the ground connection is missing, it can cause
electric shock, burn damages, fire or even death .
If a VFD is used and wrongly programmed, it can
damage the pump and lead to high tempera-
tures or other dangers .
All electrical installation must be carried out by
authorized personnel in accordance with
EN60204-1 and/or local regulations .

8.5 Responsibility

Danfoss takes no responsibility for any abnormal
injuries, risks or damages that could arise caused
by abnormal conditions, vibrations, corrosion,
abrasives, foreign objects or excessive tempera-
tures and shall not be liable for any consequen-
tial or incidental damages .
8.6 Scrapping criteria
Whether the pump can be repaired or need to be
scrapped, depends on in which conditions the
internal parts are, or how damaged the whole
unit is . Please use appendix 6, Trouble shooting
guide as guideline or send the pump to Danfoss
headquarter in Denmark for evaluation .
For other observations or troubles, please see
appendix 7, Right and Wrong which gives good
advises regarding design, installation, wiring and
troubleshooting .
In case the pump needs to be scrapped, please
follow your local environmental rules .
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