Tech
IV.j) Factory settings
This option enables the user to restore factory settings defined by the
manufacturer.
V. Protection
In order to ensure safe and failure-free operation, the regulator has been equipped
with a range of safeguards. In case of alarm, a sound signal is activated and the
display shows an appropriate message.
To restore operation, touch the screen.
During an alarm, manual operation is available. However, the user should
ensure that such activity will not cause any damage.
The controller is equipped with the following alarm protection:
1. Temperature alarm – it stops the valve temperature regulation and sets the valve
in its safest position - the floor valve will be closed whereas the CH valve will be
opened.
2. Alarm - C1-4 SENSOR – it may mean that: 1) no sensor is connected, 2) the
sensor has been connected incorrectly, 3) the sensor is damaged
The regulator has a WT 1,6A tube fuse-link protecting the network.
Caution:
Higher amperage fuse should not be used as it may damage the
controller.
V. Maintenance.
Before and during the heating season, the ST-408N controller should be
checked for condition of its cables. You should also check if the controller is properly
mounted and clean it if dusty or dirty.
Technical data:
Regulation range of the CH valve temperature
10
o
C : 90
o
C
Regulation range of the floor valve temperature
10
o
C : 55
o
C
Regulation range of the DHW tank temperature
1
o
C : 80
o
C
Supply voltage
230V/50Hz +/- 10%
Power consumption
max. 4W
Thermal resistance of the sensors
-25
o
C : 90
o
C
Ambient temperature
5
o
C : 50
o
C
Load on each output
0,5A
Fuse link
6,3A
! WARNING !
In case of no flow in the short CH boiler circulation (CH system installed
-
25
-