23
t
-display
Description
First segment
x[
Boiler control option
1
Boiler enabled internal modulation with booster on *
2
Boiler high/low
3
Boiler enabled internal modulation with booster off *
4
Analog signal 0-10V on temperature
5
Analog signal 0-10V on output %
t
-display
Description
Second segment
[y
Operation mode
0
HTG and DHW off
1
HTG and DHW on
2
HTG on and DHW off
3
HTG off and DHW on
Table 08
Boiler control option
* NOTE:
Booster function n/a in UK
6.6 Setting mode service level (
X00
)
(only for the qualified service engineer)
To prevent accidental, unauthorised access by non-qualified persons the control sys-
tem requires an input code to gain access to the second level of boiler control.
- Press the ‘
m
’ - and ‘
s
’-keys simultaneously and hold. The
‘code’
-display now
shows a letter
c
with a random number in the
t
-display.
- While holding both keys pressed, set the
t
-display to
12
, using the [
+
] or [
-
]-
keys and press the ‘
e
’-key.
- The display will flash twice confirming acceptance of the access code.
- Release the keys and
c12
will dissappear from the display. You are now in the
service mode
WARNING:
changing factory defaults without reference to the tables contained in this
manual may result in incorrect operation.
- To delete the service code press the ‘
reset’
-key once
- If no keys are pressed over a 15 minute period the service code will delete auto-
matically
