Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 97

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On: Switching off activated
Impact heat generation lock (2305)
This parameter is used to set whether the heat generator lock should be
effective only for heating requests or also for DHW requests.
Heating mode only: Only heating requests are locked. DHW requests
are still operated.
Heating and HW mode: All heating and DHW requests are locked.
Temp differential max (2316)
When the pump reaches the maximum speed with the setting temperature
rise nominal, the temperature difference increases via the boiler. The val­
ue set in temperature rise maximum is not exceeded. This is achieved by
reducing the boiler setpoint to the current return temperature plus the val­
ue shown here.
Caution
The limit of the boiler rise may only be performed if a modulating
heat circuit pump is configured, i.e. if prog. no. 6085 (Function
output P1) is assigned to a heating circuit pump.
Temp differential nominal (2317)
The spread between boiler flow temperature and boiler return temperature
is called the temperature rise.
For operation with a modulating pump, the temperature rise is limited with
this parameter.
Pump modulation (2320)
None: The function is switched off.
Demand: Actuation of the boiler pump occurs at the speed calculated for
the DHW pump during DHW mode or with the highest calculated speed
for the max. 3 heating circuit pumps during pure heating mode.
The calculated pump speed for heating circuit 2 and 3 is only evaluated
if these heating circuits are also dependent on the setting of the divert­
boiler pump/DHW diverting valve control ).
ing valve (parameter
Boiler setpoint: The boiler pump modulates its speed so that the current
setpoint (DHW or buffer storage tank) is achieved on boiler flow. The
speed of the boiler pump should be increased within the specified limits
until the burner has reached its upper output limit.
Temp differential nominal: The boiler output is controlled to the boiler
setpoint.
The control of the pump speed controls the speed of the boiler pump so
that the nominal rise between the boiler return and boiler flow is ob­
served.
If the actual rise is larger than the nominal rise, the pump speed is in­
creased, otherwise the pump speed is reduced.
Burner output: If the burner is operated with low output then the boiler
pump should also run at low speed. During high boiler output the boiler
pump should run at high speed.
Pump speed min (2322)
The working range can be defined in percent of output for the modulating
pump. The control translates the percent data internally to speeds.
The value 0% corresponds to the minimum pump speed.
Pump speed max (2323)
The pump speed and with it, the power consumption can be limited via the
maximum value.
Output nominal (2330) and Output basic stage (2331)
The settings under prog.no. 2330 and prog.no. 2331 are necessary when
setting up boiler cascades with boilers of different output.
9 Settings
97