- The pump is installed in a consumer circuit that supplies a static heating system with radiators. The pressure-controlled Δp-v, Dynamic Adapt plus or temperature-controlled “Hall temperature T-const.” control modes can be selected for this application.
Pressure control
If the heating circuit supplies multiple rooms, the radiators will be fitted with control valves to control each room’s temperature individually. In this case, Δp-v (nominal delivery head setting required) or Dynamic Adapt plus (nominal delivery head setting not required) can be selected. For this application, Wilo recommends the Dynamic Adapt plus control mode.
Hall temperature control modes
If the heating circuit supplies heat to a large thermal zone (e.g., a hall), the control valves on the radiators are redundant or are not present in an existing building. The pump can then directly control the hall temperature to the desired setpoint T = 3 °C … 30 °C using the “Hall temperature T-const.” control mode. For this purpose, it is necessary to install a temperature sensor or a room user interface in the hall to measure the temperature and act as a setpoint controller. These values are transmitted to the pump via the analogue inputs. The temperature sensor to measure the actual temperature can either be connected directly as a PT1000 sensor or as an active sensor with current- or voltage-controlled signal. The setpoint can also be transmitted via a current- or voltage-controlled signal. If only one actual value sensor is installed in the room, the setpoint can also be set directly on the pump as a fixed value.
- The pump is installed in a consumer circuit that supplies a slow surface heating system, e.g. underfloor heating. The pressure-controlled Δp-c, Dynamic Adapt plus or temperature-controlled “Hall temperature T-const.” control modes can be used for this application.
Pressure control
If the heating circuit supplies multiple rooms, the underfloor heating circuits will be fitted with control valves to control each room’s temperature individually. For underfloor heating, the pressure fluctuations through valves are rather low in relation to the pressure loss in the pipe network. For this reason, Δp-c (nominal delivery head setting required) or Dynamic Adapt plus (nominal delivery head setting not required) can be selected in this case. For this application, Wilo recommends the Dynamic Adapt plus control mode.
Hall temperature control modes
If the heating circuit supplies heat to a large thermal zone (e.g., a hall), the control valves on the underfloor heating’s distributor connections are redundant and are often not present in existing buildings. The pump can then directly control the hall temperature to the desired setpoint T = 3 °C … 30 °C using the “Hall temperature T-const.” control mode. For this purpose, it is necessary to install a temperature sensor or a room user interface in the hall to measure the temperature and act as a setpoint controller. These values are transmitted to the pump via the analogue inputs. The temperature sensor to measure the actual temperature can either be connected directly as a PT1000 sensor or as an active sensor with current- or voltage-controlled signal. The setpoint can also be transmitted via a current- or voltage-controlled signal. If only one actual value sensor is installed in the room, the setpoint can also be set directly on the pump as a fixed value.
- The pump is installed in a consumer circuit that supplies a ceiling heating. The pressure-controlled Δp-c, Dynamic Adapt plus or temperature-controlled “Hall temperature T-const.” control modes can be used for this application.
Pressure control
If the heating circuit supplies multiple rooms, the ceiling heating circuits will be fitted with control valves to regulate each room’s temperature individually. For ceiling heating, the pressure fluctuations through valves are rather low in relation to the pressure loss in the pipe network. For this reason, Δp-c (nominal delivery head setting required) or Dynamic Adapt plus (nominal delivery head setting not required) can be selected in this case. For this application, Wilo recommends the Dynamic Adapt plus control mode.
Hall temperature control modes
If the heating circuit supplies heat to a large thermal zone (e.g., a hall), the control valves on the ceiling heating’s distributor connections are redundant and are often not present in existing buildings. The pump can then directly control the hall temperature to the desired setpoint T = 3 °C … 30 °C using the “Hall temperature T-const.” control mode. For this purpose, it is necessary to install a temperature sensor or a room user interface in the hall to measure the temperature and act as a setpoint controller. These values are transmitted to the pump via the analogue inputs. The temperature sensor to measure the actual temperature can either be connected directly as a PT1000 sensor or as an active sensor with current- or voltage-controlled signal. The setpoint can also be transmitted via a current- or voltage-controlled signal. If only one actual value sensor is installed in the room, the setpoint can also be set directly on the pump as a fixed value.
- The pump is installed in a consumer circuit that supplies very fast air heating (e.g., a fan heater). The pressure-controlled Δp-v, Dynamic Adapt plus or temperature-controlled “Hall temperature T-const.” control modes can be selected for this application.
Pressure control
If the heating circuit supplies multiple rooms, the radiators will be fitted with control valves to control each room’s temperature individually. In this case, Δp-v (nominal delivery head setting required) or Dynamic Adapt plus (nominal delivery head setting not required) can be selected. For this application, Wilo recommends the Dynamic Adapt plus control mode.
Hall temperature control modes
If the heating circuit supplies heat to a large thermal zone (e.g., a hall), the control valves on the fan heaters are redundant or are not present in an existing building. The pump can then directly control the hall temperature to the desired setpoint T = 3 °C … 30 °C using the “Hall temperature T-const.” control mode. For this purpose, it is necessary to install a temperature sensor or a room user interface in the hall to measure the temperature and act as a setpoint controller. These values are transmitted to the pump via the analogue inputs. The temperature sensor to measure the actual temperature can either be connected directly as a PT1000 sensor or as an active sensor with current- or voltage-controlled signal. The setpoint can also be transmitted via a current- or voltage-controlled signal. If only one actual value sensor is installed in the room, the setpoint can also be set directly on the pump as a fixed value.
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The pump is installed in a generator or feeder circuit that supplies a hydraulic shunt with heat. Hydraulic shunts are installed to hydraulically decouple two systems. In this context, a distinction must be made between two objectives:
1. The feed temperature is to be set on the secondary side. To do this, the volume flow on the primary side must be reduced accordingly in relation to the secondary side. The Wilo-Stratos MAXO provides the “Secondary feed temperature” control mode for this purpose.
2. The energy is to be transferred without raising the return temperature if at all possible, so that the demands placed on the return temperature by the boiler manufacturers or district heating substations are met. In this case, it is necessary to adjust the volume flow on the primary side to that on the secondary side. The Wilo-Stratos MAXO provides the “return ΔT-const.” and Multi-Flow Adaptation control modes for this purpose.
Temperature control: Constant secondary feed temperature T-const.
The feed temperature behind the hydraulic shunt (secondary side) is controlled to the defined setpoint T = 20 °C … 130 °C by adjusting the speed of the pump in front of the shunt (primary side). For this purpose, a temperature sensor (PT1000 or active sensor with current- or voltage-controlled signal) must be installed in the secondary feed. The pump is connected via one of the two analogue inputs.
Temperature control: ΔT-const. between primary side return and secondary side return
The temperature difference between the hydraulic shunt primary and secondary returns is controlled to reach the defined setpoint ΔT = 2 K … 10 K. Independent of the differential pressure, the pump provides the exact volume flow required to maintain the specified setpoint temperature difference. The volume flow in the primary circuit is thereby adjusted to the secondary volume flow. It is therefore necessary to install one or two temperature sensors (PT1000 or active sensor with current- or voltage-controlled signal) in the primary and secondary return. The connection to the pump is made via both analogue inputs.
The correct configuration of the installed temperature sensors is a prerequisite for correctly setting the control function. T1 is measured in the return on the primary side and T2 in the return on the secondary side.
Control is based on the following formula: T1 = T2 + ΔT. T1 is to be seen here as the reference variable and the temperature that can be influenced, which is dependent on the flow rate of the pump. T2 represents a reference value in the system that cannot be directly influenced by the pump.
Multi-Flow Adaptation
With the Multi-Flow Adaptation control mode, the volume flow in the generator/feeder circuit (primary circuit) is aligned with the volume flow in the consumer circuits (secondary circuit). Multi-Flow Adaptation is set in the Wilo-Stratos MAXO feeder pump in the primary circuit upstream of the hydraulic shunt. The Wilo-Stratos MAXO feeder pump is connected to the Wilo-Stratos MAXO pumps in the secondary circuits via a data cable. The feeder pump continuously receives the respective required volume flow from each individual secondary pump at short intervals. The sum of the required volume flows from all secondary pumps is set by the feeder pump as the target volume flow. On commissioning, all associated secondary pumps must be registered with the primary pump so that it can take their volume flows into consideration. A fixed volume flow requirement can be entered for non-communication-capable secondary pumps so that their flows are also taken into consideration. It is also possible to set a correction factor on the feeder pump, which provides additional supply security.
