18
07
THERM CONNECT
defrost
WOLF run around coil systems
07.06 Faults and their elimination
07.06.01 Min. pressure switch-off
If the pressure on the suction side of the system falls below the standard 1.5 bar, the system must be switched off
to protect the components of the pump. When the minimum pressure limitation is triggered, the frequency inverter
locks the system and the alarm lamp on the display lights up. In order to be able to acknowledge the fault, the
rest pressure of the system must be refilled to the pressure value specified on the type plate. The fault can then be
acknowledged via the reset button on the FI display.
07.06.02 Further fault messages
All other fault messages, such as the PTC thermistor of the pump or internal fault messages of the frequency invert-
er, are displayed as messages on the FI display. These can be acknowledged via the reset key after they have been
rectified.
All fault messages are forwarded to the BMS as a collective fault message.
07.07 Wiring diagram
Three-phase motor
on-site supply
Valve actuator
Main switch in FI (option)
Supply line
Fault
Operation
Temperatur sensor
Temperatur sensor
Return exhaust air
Pressure sensor
flow exhaust air
release by
customer
