en – Original Instructions
30
SCUBA DRY – Additional Installation, Operation and Maintenance Instructions
7.3
There is little or no flow rate and pressure
Cause
Solution
Three-phase motor turning in the wrong direction
Check the direction of rotation and change if necessary; see
paragraph 5.3
Presence of air in the unit
•
Bleed the unit and/or
•
Make a relief hole, see paragraph 4.3.2, and/or
•
Raise the liquid level, and/or
•
Increase the installation depth, and/or
•
Reduce the flow rate and/or
•
Replace the unit with another with lower performance levels
and/or
•
Increase the diameter of the suction pipe to reduce flow
resistance
Check valve locked in closed or partially closed position
Replace the check valve
Foot check valve locked in closed or partially closed position
Replace the foot check valve
Suction filter clogged
Clean the filter
Throttled suction and/or discharge pipes
Remove the throttling
Piping and/or unit clogged
Remove the clogging
Energised
Check the electric power supply
Liquid leaks from the gaskets of the piping system or the unit
•
Replace the gaskets
•
Check that the installation complies with the intended use
limits and/or
•
Contact Xylem or the Authorised Distributor
Low rotation speed
Check the calibration of the frequency converter, if installed
Undersized unit
Contact Xylem or the Authorised Distributor
7.4
The unit starts too frequently (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
Check valve blocked or clogged
Replace the check valve
Starter set incorrectly, or faulty
Adjust or replace the starter
Expansion vessel
•
No pre-charge, or
•
Undersized, or
•
Not installed
•
Pre-charge the expansion vessel, or
•
Replace the expansion vessel with another suitable one, or
•
Install an expansion vessel
Oversized unit
Contact Xylem or the Authorised Distributor
