Potterton Gas condensing boiler Installation, Operation And Maintenance Manual page 86

Programming
Pump modulation
(2320)
Pump speed min
(2322)
Pump speed max
(2323)
Output nominal
(2330)
Output basic stage
(2331)
Output at pump speed min
(2334)
Output at pump speed max
(2335)
Max fan output heating oper-
ation
(2441)
Max fan output heating full
charging
(2442)
86
- None: the function is switched off.
- Demand: Actuation of the boiler pump occurs with 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 diverting valve (Pa-
rameter boiler pump/DHW diverting valve control).
- Boiler setpoint: The boiler pump modulates its speed so that the current set-
point (DHW or buffer storage tank) is achieved on boiler flow. The speed of the
boiler pump must be raised 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 held.
If the actual rise is larger than the nominal rise, the pump speed is increased,
otherwise the pump speed is reduced.
- Burner output: If the burner is operated with low output then the boiler pump
should also run on low speed. During high boiler output the boiler pump should
run on high speed.
For the modulating pump the working range can be defined in percent of output.
The control translates the percent data internally into speeds.
The value "0%" corresponds to the minimum pump speed.
The pump speed and with it, the power consumption can be limited via the maxi-
mum value.
The settings under prog.no. 2330 and prog.no. 2331 are necessary when setting
up boiler cascades with boilers of different power.
If under the prog. no. 2320 option burner load is selected, the boiler pump is oper-
ated up to the set burner load under prog. no line 2334 to minimum pump speed.
from the set burner output set under prog. no. 2335 the boiler pump is operated
on maximum pump speed. If the burner output lies between these two values,
the pump speed for the boiler pump is given by linear conversion.
With this parameter the maximum boiler capacity can be limited in heating
mode.
Note: These are calculated values. The actual output must be calculated using a
gas meter, for example.
With this parameter the maximum boiler capacity can be limited in full charging
mode at layer storage.
Note: These are calculated values. The actual output must be calculated using a
gas meter, for example.
Paramount three 30-115 kW 396532 05.11