HDG M299, Operation Manual

Page: 86 / 176

6 Using the heating system – ON/OFF menu
86
HDG M299/300/350/400 - Version 1 - en
©
HDG Bavaria GmbH 07/2008
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
“External 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 mm²) between the two control
cabinets.
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 1-01
submenu, press the
F4 key under the
EDIT
command in the display .
✓
The display switches to the
Enter switch on/off time 1-
11
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
select the day of the week that is to be reset.
3. Set the times using the numerical keypad.
Show switch on/off time 1-01
On: 00:00 On: 00:00 Time:15:55
Off: 24:00 Off: 00:00
Day : Monday
EDIT END
Enter switch on/off time 1-11
On: 00:00 On: 00:00 Time:15:55
Off: 24:00 Off: 00:00
Day : Monday
CHOOSE END
If you want the heating system to be ready for operation 24 hours a
day, the first switch-on time must be set to
ON: 00:00
and the
first switch-off time to
OFF: 24:00
!