46
12
Fig. 24
Note
The electronic flow switch is only used in the operating
mode "water/water with intermediate circuit".
The flow switch monitors the minimum flow rate
required for operating the heat pump.
1.
Check the tip of the sensor regularly for deposits.
2.
Clean the tip of the sensor with a cloth if neces-
sary.
Remove stubborn deposits (such as limescale)
with commercially available vinegar-based clean-
ers.
3.
Switch on the power supply.
LEDs "0" to "9" illuminate green in sequence and
then extinguish again.
The operating display then follows.
Flow switch operating displays
LED
Meaning
Several LEDs illuminate green.
Indication between no (no LED illuminates) and maximum
flow rate (all LEDs illuminate green).
The higher the flow rate, the more LEDs illuminate green.
LED "9" flashes green.
Flow rate higher than nominal flow rate
If necessary, carry out an operating display adjustment (high
flow balancing, see below), for example if a circulation pump
had to be sized for higher flow rates.
LED "0" flashes green.
Flow rate below minimum flow rate
Note
A fault is triggered at the heat pump control unit if the flow
rate falls below the switching point. Fault message; see
"Vitotronic SPS" service instructions.
LED for switching point illuminates orange.
Switching output closed; heat pump in standby mode
LED for switching point illuminates red.
Switching output open; heat pump in a fault state (compres-
sor switches off. Fault message; see "Vitotronic SPS" service
instructions.).
All LEDs illuminate alternately red and green.
Short circuit at the switching output
Note
The current operating mode is displayed once the short cir-
cuit has been remedied.
No LED illuminates.
Operating voltage < 85 V~ or power supply failure.
Commissioning, inspection, maintenance
Checking the electronic flow switch, type IFM
5789 986 GB
