66
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, type 2.0" 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, type 2.0" 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 < 19 VDC or power supply failure.
Carry out an operating display adjustment (high flow balancing if necessary)
High flow balancing establishes the existing (higher)
flow rate as the nominal flow rate. For the correspond-
ing values for operating mode "water/water with inter-
mediate circuit", see "Specification" on page 82
onwards.
Note
High flow balancing can shift the switching point of the
flow switch.
1. Start the appliance with the existing flow rate.
2. Press and hold for around 5 s until LED "9"
flashes.
3. Release .
Fitting the top panel and front panel (closing the heat pump)
See page 55.
Instructing the system user
The system installer should hand the operating instruc-
tions to the system user and instruct the user in oper-
ating the system.
This includes all components installed as accessories,
e.g. remote control units. In addition, the system instal-
ler must make the user aware of the required mainte-
nance work.
For further details of operation
Operating instructions for
"Vitotronic SPS, type 2.0"
Commissioning, inspection, maintenance
Checking the electronic flow switch, type IFM
(cont.)
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