Temp diff on return div (4790), Temp diff off return div (4791)
and Compar temp return div (4795)
At the appropriate temperature difference between the return sensor B73
and the selectable comparative temperature the return is re-routed to the
lower buffer storage tank section. The function can either be used as
return temperature increase or as return temperature decrease. The way
this works is defined in prog. no.4796.
Using the definition of the temperature differences in prog. no. 4790 and
4791 the switch on and switch off point of the return redirection is
established.
In prog.no. 4795 the buffer storage tank sensor is selected that delivers
the value for the comparison with the return temperature, to switch on the
return redirection with the aid of the set temperature differences.
Important
To activate the return redirection, a Qx relay output (program no.
5890-5892) for the Y15 buffer deflector valve and a Bx sensor
input (program no. 5930-5932) for the B73 common return sensor
must also be configured.
Optg action return diversion (4796)
The function can either be used as return temperature increase or as
return temperature decrease.
Temp decrease: If the return temperature of the consumers is higher
than the temperature on the selected sensor (prog. no. 4795), the lower
part of the storage tank can be preheated with the return flow. The
return temperature drops even lower with this, which leads to a higher
efficiency with a condensing boiler, for example.
Temp increase: If the return temperature of the consumers is lower than
the temperature on the selected sensor (prog. no. 4795), the return flow
can be preheated by redirecting over the lower part of the storage tank.
In this way, for example, return flow preheating can be implemented.
Partial charging setpoint (4800)
As a result of the hydraulic uncoupling of the lower part of the buffer
storage tank, the volume of the storage tank to be heated is reduced. The
remaining, upper part of the storage tank is therefore charged faster. The
lower part of the storage tank is heated up first if the upper part of the
storage tank is charged.
As soon as the temperature measured on the Buffer sensor B4/B42 has
reached the target partial charging value, the changeover valve switches
to "Pass though" and the rest of the storage tank is also charged. To do
this, a Buffer return valve Y15 and a Buffer sensor B4 or Buffer sensor
B42 must be configured.
Full charging (4810)
The {1}full charging{2} function enables the released generator to be
switched off first despite the automatic generator lock if the buffer storage
tank is fully charged. During active function the generator parameterized
for the full charging function is only switched off when the full charging
setpoint is reached or the boiler must be switched off because of burner
control.
Off: The full charging function is switched off.
Heating mode: Full charging becomes active if the automatic generator
lock blocks the heat source during valid heat request based on the
buffer temperature. If the buffer storage tank reaches the requested
temperature at the sensor parameterized for the full charging function,
the function is ended.
Always: Full charging becomes active if the automatic generator lock
blocks the generator during valid heat request based on the buffer
temperature or the heat request is invalid. If the buffer storage tank
reaches the requested temperature at the sensor parameterized for the
full charging function, the function is ended.
9 Settings
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