Danfoss APP series User Manual

106 | 180R9346 | AQ240486503020en-001702 © Danfoss | 2023.03
Operation guide Installation, Operation and Maintenance APP 53-92 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 High Pressure
Pumps sales oce.
If the electric motor is too small for the APP, APP S
or APP S 674 pump, it cannot provide sucient
torque.
3. High torque on electric motor

Danfoss APP series Specifications

General

Brand	Danfoss
Model	APP series
Category	Water Pump
Language	English