DP Pumps Hydro-Unit Utility Line F, Installation & Operating Manual

Page: 53 / 96

53 / 96
A B C D E F G H I J K L M Possible cause Remedy
4)
- - - ✘ ✘ - - - ✘ - ✘ - ✘ Pump / piping not completely vented
and/or primed.
Vent and prime.
- - - ✘ ✘ ✘ - - ✘ ✘ ✘ - ✘ Check valve in bypass line defective Replace.
- - - - - ✘ - - - - - - - Insufficient inflow Restore normal inflow. Connect
accumulator.
- - - - - ✘ - - ✘ ✘ - - ✘ Pump runs sluggishly. Have pump repaired by a specialist.
- - - - - - - ✘ - - - - - Defective mechanical seal Replace.
- - ✘ - - - - - ✘ - - - ✘ Incorrect pre-charge pressure of
accumulator
Set correct pre-charge pressure.
Replace membrane.
✘ - ✘ ✘ - - - - - ✘ ✘ - - Inlet-side pressure switch defective or
set incorrectly. Check the value set at the pressure
switch; adjust if required.
- - - - - - - - ✘ - ✘ ✘ ✘ Defective time relay or time set
incorrectly.
Check time relay. Correct minimum
operating time if required.
- - - - - - - - - - - ✘ - System leaking. Restore system integrity.
- - ✘ - - ✘ ✘ - - - ✘ ✘ - Discharge-side pressure switch
defective or set incorrectly. Check the value set at the pressure
switch; adjust if required.
✘ - - - - - - - - ✘ - - - Intermittent voltage fluctuations Press reset/fault acknowledgement
key.
- - - ✘ - - - - ✘ ✘ - - ✘ Defective check valve Check and replace if necessary.
- - - ✘ ✘ ✘ - - ✘ - ✘ - - Pump running in the wrong direction
of rotation. Interchange two of the phases of the
power supply.
- - - ✘ - ✘ - - - - ✘ ✘ - Inlet pressure lower than specified in
the purchase order Connect suction-side inlet tank.
Contact the manufacturer.
- ✘ - - - ✘ - - - ✘ ✘ - - Water extraction higher than specified
in the purchase order Contact the manufacturer.