en
28
Installation
Commissioning
Adjustments
Tr
oubleshooting
Data comm
unication
3.4
Additional functions
In this menu, additional functions can be selected and
adjusted, as long as there are free relays available. The
following additional functions are available:
• Function block 1
• Function block 2
• Stratifi ed return
• Error relay
Function block
In addition to the pre-defi ned optional functions, up
to 2 function blocks consisting of thermostat func-
tions, timer and differential functions are available.
With the help of these function blocks, further com-
ponents and functions respectively can be controlled.
To each function block, sensors and free relays can
be allocated. Sensors already in use can be allocated
again without impeding their control functions.
Within a function block the functions are intercon-
nected (AND gate). This means that the conditions
of all the activated functions have to be fulfi lled (e. g.
thermostat and timer) for switching the allocated re-
lay. As soon as one condition is not fulfi lled, the relay
switches off.
Thermostat function
The relay allocated to the function block switches on,
when the adjusted switch-on temperature (Th(x)on)
is reached. It switches off when the adjusted switch-
off temperature (Th(x)off) is reached. The switching
conditions of all other activated functions of the
function block have to be fulfi lled as well.
Adjust the heating function with Th(x)off > Th(x)on,
the cooling function with Th(x)on > Th(x)off. The
temperatures cannot be set to an identical value.
∆
T function
The relay allocated to the function block is switched
on as soon as the adjusted switch-on temperature
difference (
∆
Th(x)on) is reached. It is switched off as
soon as the adjusted switch-off temperature differ-
ence (
∆
Th(x)off) is reached.
If the switch-on difference is reached, the pump is
activated at full speed for 10 s. Then, the speed is re-
duced to the adjusted minimum pump speed value.
If the temperature difference reaches the adjusted
nominal temperature difference, the pump speed
increases by one step (10 %). If the temperature dif-
ference increases by the adjustable
Rise
value, the
pump speed increases by 10 % respectively until the
maximum pump speed of 100 % is reached.
Timer
The relay allocated to the function block switches
on when the current operating time is within the ad-
justed time frame.
Flow rate dependent de-/activation
The relay allocated to the function block switches
on when the adjusted switch-on fl ow rate
dVon
is
reached at the fl ow rate sensor. It switches off when
the adjusted switch-off fl ow rate
dVoff
is reached.
If the
Inverted
option is activated, the relay oper-
ates vice versa.
The
Sensor dV
channel indicates the fl ow rate sen-
sor currently used.
Reference relay
Up to 3 reference relays can be selected. Whether
the reference relays are to be switched in series
(AND), in parallel (OR), in series inverted (NAND)
or in parallel inverted (NOR) can be adjusted in the
Mode channel.
In the OR mode, the switch-on condition for the ref-
erence relay function is considered fulfi lled when at
least one of the reference relays is active.
If none of the reference relays is active, the switch-on
condition for the reference relay function is consid-
ered unfulfi lled.
In the NOR mode, the switch-on condition for the
reference relay function is considered fulfi lled when
none of the reference relays is active.
