Fault Finding Chart; Disposal - Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento

9. Fault finding chart

Fault
The dosing has
stopped or the output
is too low.
Pump dosing too little
or too much.
Pump dosing
irregularly.
Leakage from drain
hole.
Frequent diaphragm
failures.

10. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
The crossed-out wheelie bin symbol on
a product means that it must be
disposed of separately from household
waste. When a product marked with this
symbol reaches its end of life, take it to a
collection point designated by the local
waste disposal authorities. The separate collection
and recycling of such products will help protect the
environment and human health.
See also end-of-life information at
www.grundfos.com/product-recycling.
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Cause
Valves leaking or blocked.
Valves incorrectly installed.
Suction valve or suction pipe/hose
leaking or blocked.
Suction lift too high.
Viscosity too high.
Pump out of calibration.
Pump out of calibration.
Valves leaking or blocked.
Diaphragm defective.
Diaphragm not fastened properly.
Counter-pressure too high
(measured at the pump discharge
port).
Sediment in dosing head.
Remedy
Check and clean the valves.
Remove and fit valves. Check that the arrow
on the valve casing is pointing in the liquid
flow direction. Check that all O-rings have
been fitted correctly.
Clean and seal the suction pipe/hose.
Install the pump in a lower position.
Install a priming tank.
Select the anti-cavitation function, see section
5.15 Anti-cavitation.
Install a pipe/hose with larger cross-section.
Fit spring-loaded valves.
Calibrate the pump, see section
Calibrate the pump, see section
Check and clean the valves.
Install a new diaphragm.
Install a new diaphragm and ensure that the
diaphragm is fastened properly.
Check the system. Check the injection valve.
Clean/flush the dosing head.
7. Calibration.
7. Calibration.