Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 104

9 Settings
104
Auto heat gen lock SD (4721)
The heat generator is locked if the the temperature in the buffer storage
tank is higher than the boiler setpoint+Auto heat gen lock SD.
Temp diff buffer/CH (4722)
If the temperature difference between buffer storage tank and heating cir­
cuit temperature request is large enough, the heat required by the heating
circuit will be taken from the buffer storage tank. The heat generator is
locked.
Min st tank temp heat mode (4724)
If the storage tank temperature of the buffer storage tank drops below this
value, the heating circuit is switched of if no generator is available.
Charging temp max (4750)
The buffer storage tank is charged from solar energy up to the set charg­
ing temperature maximum.
Note
The collector overheating protection function can put the collector
pump back in operation until the maximum storage tank tempera­
ture is reached.
Recooling temp (4755)
The collector overheating protection function can put the collector pump
back in operation until the maximum storage tank temperature is reached.
Recooling HW/CHs (4756)
Two functions are available for recooling of the buffer storage tank down
to the recooling temperature. The energy can be discharged via a heat
draw by the room heating or the DHW storage tank. This can be separate­
ly set for each heating circuit.
Recooling collector (4757)
Recooling when the buffer storage tank temperature is too high by trans­
mitting energy to the environment via the collector area.
Off: Recooling has been deactivated.
Summer: Recooling is only active in summer.
Always: Recooling is always active.
With solar integration (4783)
Setting of whether the buffer storage tank can be charged by solar energy.
Temp diff on return div (4790),Temp diff off return div (4791)
andCompar 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 re­
turn 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 estab­
lished.
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.
Note
To activate the return redirection the relay outlet QX1, QX2, QX3
(prog. no. 5890-5892) for the buffer deflector valve and the sensor
inlet BX1, BX2, BX3 (prog. no. 5930-5932) for the rail return sen­
sor B73 must also be configured.
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