ECOLAB DryExxEco Advanced-ETH Betriebsanleitung Seite 184

Fault description
Pump is running, but is
not conveying any or
only little fluid.
Ice formation on the
compressed air valve of
the pump
Air bubbles in the
pressure piece of the
pump
Fluid escaping from the
bleed connection
Troubleshooting for Lub-O-DryExx® Diaphragm compressed air pump
Cause Remedy
Negative Ensure that the required negative pressure
pressure/vapour required to suck in the fluid is not higher than the
pressure in the vapour pressure of the fluid being conveyed
incorrect ratio (cavitation).
Ball return valves Check pump for stuck ball return valves. If the
stuck product being conveyed is not compatible with the
pump elastomers, these can swell up. Replace
ball return valves and seals with parts made from
appropriate elastomers. The valve balls also
become smaller with increasing wear and can
therefore become stuck in the valve seats. In this
case, replace valve balls and valve seats.
Humidity in the Check if the compressed air contains too much
compressed air humidity. Either fit a dryer or a hot air generator for
compressed air. In some applications, a separator
can be used instead to remove the water from the
compressed air.
Diaphragm Check pump for broken diaphragm.
broken
Leaking Check external diaphragm plate for leaks (see
diaphragm plate section 8C).
Leaking o-rings Check clamping straps as well as o-rings and
and seals seals for leaks, especially on the suction elbows.
Leaking line Ensure that the line connections are airtight.
connections
Diaphragm Check pump for broken diaphragm.
broken
Leaking Check the pump for leaks between the outer
diaphragm plate diaphragm plates and piston rod.
85
Troubleshooting
Rev. 02-09.2017