ST-550 zPID
23
Valve pump
This option enables the user to select the working mode of the pump out of the following:
➢
always ON
- the pump operates all the time, regardless of temperatures,
➢
Never
- the pump is permanently deactivated and the regulator controls only the valve opera-
tion,
➢
ON above the threshold
- the pump is activated above the pre-set
switch on temperature
.
In the case of additional vales, these settings concern the pump connected to the valve module (e.g. ST-
431N). In the case of a built-in valve, these settings concern the additional pump which has been
assigned
Valve pump
operation algorithm.
VI.5.
Additional pump 1 / Additional pump 2
These submenus enable the user to select the type of additional pump connected to the additional pump
contact (
Operation algorithm selection
) and configure its operating parameters.
VI.5.a)
Algorithm selection
Once the additional pump has been connected, the user selects its type in
Algorithm selection
parameter.
If
valve pump
is selected, the pump operates according to the parameters configured in the built-in valve
submenu (see: previous section).
If the additional pump is to serve as short circuit pump or floor pump, it is necessary to configure its
operation in the following submenus.
VI.5.b)
Short circuit pump
When short circuit pump is selected, the user can adjust the pump operation to individual needs using
the parameters available in
CH boiler protection pump
submenu.
The additional pump which serves as a short circuit pump is activated when the CH boiler temperature
reaches the user-defined threshold value –
Pump activation temperature
(measured at CH sensor). The
pump remains active until the temperature drops below the pre-set value by hysteresis value.
If other sensor is to serve as CH sensor, it must be selected in
CH sensor
parameter.
VI.5.c)
Floor pump
If floor pump is selected, the user can adjust the pump operation to individual needs using the parameters
available in
Floor pump
submenu.
Once the pump is activated (switched on), the user sets the minimum (threshold) temperature of pump
activation (measured by CH sensor) and the maximum (pre-set) temperature of the underfloor heating
system (measured by the floor sensor, within the range of 25⁰C – 55⁰C).
Below the minimum temperature the pump remains inactive. Above this temperature the pump is enabled
and it remains active until the maximum temperature is reached – then it is switched off. The pump is
enabled again when the temperature drops by the value defined as
Hysteresis below pre-set
.
If other sensor is to serve as CH sensor or floor sensor, it must be selected in
CH sensor
parameter
or
Floor sensor
parameter.
VI.5.d)
Circulating pump
Once this option is selected, the additional pump serves as the circulating pump. The pump controls the
valve which mixes the hot water between the CH boiler and the DHW receivers. The following parameters
need to be configured for the circulating pump to work correctly:
Operation time
This parameter defines the time of pump operation during its activity.
Pause time
This parameter defines the frequency at which the circulating pump is enabled during its activity.
Operation schedule
The user may program a daily schedule of pump operation and inactivity, with the accuracy of 30 minutes.
The pump is enabled at the frequency defined in
Pause time
parameter and remains active for the time
defined as
Operation time
. For the user’s convenience, it is possible to copy a given time setting.
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