en – Original Instructions
SCUBA DRY – Additional Installation, Operation and Maintenance Instructions
31
7.5
The unit never stops (automatic start/stop)
Cause
Solution
The float switch does not work correctly
•
Check the liquid level in the tank/basin and/or
•
Adjust the float switch and/or
•
Check that the float switch can move without impediments
The required flow rate is greater than the one expected
Reduce the required flow rate
Leaking of fluid from the piping
Eliminate the leaks
Three-phase motor turning in the wrong direction
Check the direction of rotation and change if necessary
Pipes, on-off valves or filter clogged with impurities
Remove the impurities
Starter set incorrectly, or faulty
Adjust or replace the starter
The unit runs but there is little or no flow rate
See paragraph 7.3
7.6
The differential protection device (RCD) is activated
Cause
Solution
Unsuitable type of differential
Check the type of differential
Low insulation unit
Contact Xylem or the Authorised Distributor for the replacement
7.7
The unit stops and starts cyclically, single-phase version
The unit with single-phase motor stops and starts cyclically, without the intervention of the float
switch or the starter.
Cause
Solution
Liquid temperature too high
Bring the liquid temperature back within the permitted limit
Unit mechanically seized
Check and repair the unit
Wrong power supply voltage
Check the power supply voltage
Pumped liquid too thick
Check the pumped liquid
Too many starts
See paragraph 7.4
Wrong duty point, flow rate below or above the permitted limits
Bring the flow rate back within the permitted limits
Unit faulty
Contact Xylem or the Authorised Distributor for the replacement
