Danfoss APP series User Manual

46
180R9265 / IOM APP 16-22 Appendices - v02 / 01.2013
Instruction Trouble shooting guide for APP pumps
Cause Remedy Comments
3.1 Too high outlet pressure from pump 3.1.1 Check uid salinity.
3.1.2 Check temperature.
3.1.3 Check pressure drop across RO membrane.
Pump conditions may change (more salt, lower
water temperature or scaling of RO membrane)
causing higher pressure, resulting in higher
motor torque.
3.2 Pump starts against pressure 3.2.1 Check that electric motor is correctly sized.
3.2.2 Check internal parts (see item 2.1).
3.2.3 Systems with more than one electric
motor installed:
Start motors simultaneously.
Pumps run in parallel with cascade start, may
switch o the motor relay due to too high
torque caused by high outlet pressure.
3.3 Constant torque 3.3.1 Please contact Danfoss sales oce. If the electric motor is too small for the APP
pump it cannot provide sucient torque.
3.4 Water pump damage 3.4.1 Dismantle pump and check for wear. Too heavy damage in the pump will increase
friction causing a high torque (see item 6,
Typical signs of wear).
3. High torque on electric motor

Danfoss APP series Specifications

General

Brand	Danfoss
Model	APP series
Category	Water Pump
Language	English