20
Check solar circuit pump at output
sF
Characteristics of the circulation pump (see also the
following chapter):
■
Pump always off:
–
High limit safety cut-out has responded. Reset the
high limit safety cut-out.
–
Output
sF
faulty
Replace the SDIO/SM1A electronics module.
–
Solar circuit pump faulty
Replace solar circuit pump.
■
Pump always on:
–
Coding address "02" incorrectly set
–
PWM connection faulty
–
Output
sF
always 'live'.
Replace the SDIO/SM1A electronics module.
Multi stage circulation pump
The multi stage circulation pump is switched on and off
via output
sF
.
Code/parameter "02:0" must be set.
Variable speed circulation pump with PWM control
Output
sF
must indicate a permanent voltage of
230 V
∼
. The pump speed is governed by means of a
control signal via PWM connection.
Code/parameter "02:2" must be set.
If the PWM connection is interrupted the circulation
pump must be switched off. If the circulation pump
runs at maximum speed when the PWM connection is
interrupted, an incorrect circulation pump has been
installed.
Check connection at output
sS
Subject to system scheme, a circulation pump or a
3-way diverter valve can be connected to output
sS
.
When output
sS
is on, a voltage of 230 V
∼
must be
present.
If output
sS
functions correctly during the relay/actua-
tor test but not in normal operation, check setting of
coding address "20".
Check temperature sensors
NTC
NTC
10 kΩ 20 kΩ
%
&
aVG
A
/
aÖ
jF
NTC
10 kΩ
NTC
10 kΩ
TS1
TS2
TS3
TS4
Fig. 2
1.
Pull plug of relevant temperature sensor from
SDIO/SM1A electronics module
A
and check the
sensor resistance.
2.
Compare the sensor resistance to the curve (see
Fig. 3).
3.
In the event of severe deviation replace the sensor.
Troubleshooting
Repairs
(cont.)
6131981
Diagnosis
