Viessmann Solar-Divicon PS10 Installation And Service Instructions Manual page 17

Replacing the circulation pump
HE circulation pump with PWM control, types PS20 and P20
800 80
600 60
400 40
200 20
0 0
0
Pump rate in m³/h
0
Pump rate in l/min
Fig. 12
Pressure drop curve
A
Max. delivery head
B
LED on the HE circulation pump
LED
Illuminates green.
Flashes green in short in-
tervals.
Fault indications
Flashes red and green
■
alternately
Flashes red
■
LED off
■
(cont.)
0.5 1.0
8.3 16.7
Meaning
Circulation pump in opera-
tion
Circulation pump in stand-
by
Circulation pump is ready
for operation but not run-
ning.
Note
The circulation pump
starts automatically after
the cause of the fault has
been removed.
Circulation pump switched
off (blocked)
—
B
A
1.5 2.0
25 33.2
Cause
—
—
Undervoltage (< 160 V~)
■
Overvoltage (> 253 V~)
■
Motor temperature too
high
Circulation pump does not
start automatically.
No power.
LED faulty
PCB faulty
Installation sequence
2.5
41.7
Remedy
—
—
Check the power supply.
(195 V~ < U < 253 V~)
Check ambient and heat
transfer medium tempera-
tures.
Replace circulation pump
(see page 15)
Check connecting cable.
Check whether the circula-
tion pump is running.
Replace the circulation
pump (see page 15).
17