Flotronic F 500 series, Installation, Operation And Maintenance Manual

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Trouble Shooting
Section 20 - Trouble Shooting
This section covers the most common “problems” associated with Flotronic Air Driven Double
Diaphragm Pumps. Naturally, all events cannot be covered and you should telephone the
Technical
Support Office on 01444 881871 for further assistance.
Q = Question?
A = Answer.
Q Diaphragms fail after very short working life?
A Silencers may be blocked. Check and replace.
Did you wait 5 minutes when you installed the diaphragms to ensure that the PTFE had time to
“settle - cold flow” before retightening. If not, an adequate seal would not have been made
between the base of the diaphragm and the thrust tube. See diagram fitting procedures.
Q Pump stalls?
A Check that the air supply line to the pump is of the same internal diameter as the on - off air valve
supplied with the pump. Ensure that this supply line is as short as possible, coils of pipe restrict
air volume.
Ensure that any solenoid control is located next to the pump, not further than 1 metre away,
otherwise when the solenoid turns off the air supply, the air left in the line will “die down” and
could stall out the pump. Ensure both silencers are fitted. The pump needs the back pressure
provided by the silencers to ensure the anti-stall system works correctly.
Q Pump doesn’t suck?
A Replace Divider Seal.
Ensure suction connection pipework is adequately sealed to pump fitting. If there is a tiny leak, the
pump will pull air through instead of lifting the liquid to be pumped.
Q Pump won’t cycle?
A The ‘Head’ of liquid may be equal to the air supply pressure available. Either relieve head pressure
or increase air pressure (within normal 7 bar G max limit).
Q Pump only works one cycle?
A The tie-rod and thrust tube are installed incorrectly. You must ensure that the bearings inside the
thrust tube are at the air valve end of the pump, once the tie rod is fitted. Either remove the tie rod
now and insert it on the other side of the pump or, if this is not possible due to air supply pipework,
remove the thrust tube and diaphragms and turn the thrust tube around to the correct position, as
shown in Section 10.
Q Pump cycles when pump is stalled against a closed head?
A This is normal with Flotronic and assists the anti-stall mechanism of the pump. It is normal for the
pump to cycle once or twice a minute, but if it cycles more, replace the divider seal.