6 Using the heating system – ON/OFF menu
78
HDG Compact 99 - 200 - Version 1 - en
©
HDG Bavaria GmbH 07/2008
C
ONTROLLING
B
OILER
-2
Boiler activation must be set to “
External
” on Boiler 2 with para-
meter
1-05
. Boiler 2 is controlled by a relay (K21) of Boiler 1. A nor-
mally-open contact of K21 is wired to the outgoing terminals 68/69/
70 on terminal strip X2. Boiler 2 likewise has terminals 68/69/70 on
terminal strip X2, which are internally wired to the PLC input “Ex-
ternal demand”. In order to ensure this function works properly, it is
necessary to lay a connecting line (recommended: flexible control
cable of the type YSLY-JZ 3 x 1.0 mm ) between the two control cabi-
nets.
F
UNCTION
OF
THE
RETURN
PUMP
The return pump always runs if there is demand on the boilers and
the combustion chamber temperature exceeds 200 °C. This means
that Boiler 1 must receive demand signals from the accumulator
sensor and Boiler 2 must receive the external demand signal from
Boiler 1.
S
ETTING
OPERATING
TIMES
In this menu you can view and set the operating times of the heating
system. There are two switch-on and switch-off cycles available per
weekday.
B
OILER
OPERATING
TIMES
✎
See “Procedure” in this section.
1.
In the
Show switch on/off time 1-02
submenu, press the
F4
key under the
EDIT
command in the bottom line of the display
.
✓
The display switches to the
Enter switch on/off time 1-
03
submenu.
✓
The day of the week and the first switch-on time are shown in
black.
2.
Press the
F4
key under the
CHOOSE
command in the display to se-
lect the day of the week that is to be reset.
3.
Set the times using the numerical keypad.
Switch on/off times - Display
1-
02
On: 00:00
On: 00:00
Time:15:55
Off: 24:00
Off: 00:00
: Day
: Monday
EDIT
END
Enter switch on/off time
1-03
On: 00:00
On: 00:00
Time:15:55
Off: 24:00
Off: 00:00
Day
: Monday
CHOOSE
END
