STIEBEL ELTRON SOM 8 PLUS - Page 57

57
In addition to the pre-dened optional functions,
function blocks consisting of thermostat functions,
timer and dierential functions are available. With
the help of these function blocks, further compo-
nents, resp. functions 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 fullled (e.
g. thermostat and timer) for switching the allocated
relay. As soon as one condition is not fullled, the re-
lay is switched o.
Function block
Function Function block 1
Relay 3
Thermostat
thermostat a- S3
thermostat b- S4
Differential function ∆T ∆T
Sen. 1
Sen. 2
Timer Timer
Tha-S3
Thb-S4
T-S3>S4
Timer
R3
Thermostat function
The relay allocated to the function block is switched
on, when the adjusted switch-on temperature (Th(x)
on) is reached. It is switched o when the adjusted
switch-o temperature (Th(x)o) is reached. The
switching conditions of all other activated functions
of the function block have to be fullled as well.
Allocate the reference sensor in the Sensor channel.
Adjust the maximum temperature limitation with
Th(x)o> Th(x)on and the minimum temperature
limitation with Th(x)on> Th(x)o. 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
dierence (
ΔTh(x)on) is reached. It is switched o
as soon as the adjusted switch-o temperature dif-
ference (ΔTh(x)o) is reached. The switching condi-
tions of all other activated functions of the function
block have to be fullled as well.
The
ΔT function is equipped with a speed control
function. A set temperature dierence and a mini-
mum speed can be adjusted. The non-adjustable rise
value is set to 2 K.
295931-36390-8667 SOM 8 plus_en.indb 57 20.10.2011 13:14:48