Potterton eurocondense four 125 kw, Installation, Operation And Maintanance Manual, Page: 88 / 148

A Off
E On
SW Summer/winter heating limit
T Temperature
t Time
x Outside temp attenuated (prog.no. 8703)
The heating circuit switches to summer operation as soon as the average
outside temperature over the past 24 hours rises 1°C above the value set
here. As soon as the average of the outside temperatures of the last 24
hours drops 1°C below the value set here, the heating circuit switches
back into winter mode.
24-hour heating limit (732, 1032, 1332)
The 24-hour heating limit shuts off the heating circuit if the current outside
temperature increases up to the differential set here to the current operat­
ing level (reduced or comfort setpoint). The heating switches on again if
the current outside temperature falls again below the set differential minus
1 °C.
Note
In the operating mode continuous mode or this function is not
activated.
Flow temp setpoint min (740, 1040, 1340) and Flow temp
setpoint max (741, 1041, 1341)
With this function, a range can be defined for the flow setpoint. When the
flow temperature setpoint reaches the respective limit, this remains con­
stant, even if heat demand rises or falls.
If a pump heating circuit is operated parallel with other requirements, it can
cause higher resulting temperatures in the pump heating circuit.
Flow temp setpoint room stat (742, 1042, 1342)
For room thermostat mode the flow setpoint set here applies.
With the setting --°C, the value calculated via the heating curve is used as
the flow setpoint.
Delay heat request (746, 1046, 1346)
The boiler heat request is forwarded to the burner delayed by the time set
here. In this way a slowly opening mixer can already start up before the
burner goes into operation.
Note
If the option Absolute is selected under prog.no. 1630, the value 0
must be set under this prog.no. For special functions (e.g. chim­
ney-sweep function) the delay does not have an effect (see
prog.no. 2470).
Room influence (750, 1050, 1350)
The flow temperature is calculated by means of the heating curve subject
to outside temperature. This type of control assumes that the heating
curve is set correctly, since room temperature is not taken into considera­
tion with this setting.
Fig.30 Summer/winter heating limit
SW
t
T
°C
X
E
RA-0000067
A
9 Settings
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