Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 94

Commissioning, inspection, maintenance
Further details regarding the individual steps
Flow switch indications
LED
Several LEDs illuminate green.
LED "9" flashes green.
LED "0" flashes green.
LED for switching point illuminates
orange.
LED for switching point illuminates
red.
All LEDs illuminate alternately red
and green.
No LED illuminates.
Flow switch switching point, factory-set
Vitocal Nominal
flow rate
Type 3
m /h
WW 1125
WW 1155
94
Min. flow
rate
3
m /h
29.55 21.30
35.00 26.40
Meaning
Indication between no (no LED illuminates)
and maximum flow rate (all LEDs illuminate
green).
The higher the flow rate the more LEDs illu-
minate.
Flow rate higher than nominal flow rate.
Possibly carry out an adjustment to obtain the
correct operating indications (High Flow bal-
ance, see below), for example if circulation
pumps had to be sized for higher flow rates.
Flow rate below minimum.
Note
A fault is triggered if the flow rate undershoots
the switching point (message "D6 Flow
switch").
Switching output closed; heat pump in stand-
by mode.
Switching output open; heat pump in a fault
state (compressor shuts down, message "D6
Flow switch", see Vitotronic 200,
type WO1B service instructions).
Short circuit at the switching output.
Note
The current operating mode will be displayed
once the short circuit has been remedied.
Operating voltage < 85 V~ or power failure.
Switching point
3 LED
m /h
20 .. 22
0 1 2 3 4 5 6 7 8
25 .. 27
0 1 2 3 4 5 6 7 8
(cont.)
9
9