- The pump is installed in a consumer circuit that supplies fast surface cooling, e.g. a cooling ceiling or ceiling rafts. 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 cooling circuit supplies multiple rooms, the cooling area circuits will be fitted with control valves to control each room’s temperature individually. For ceiling cooling, 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
If the cooling circuit cools a large thermal zone (e.g., a hall), the control valves on the ceiling cooling’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 = 15 °C … 40 °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 slow surface cooling, e.g. underfloor cooling. 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 cooling circuit supplies multiple rooms, the cooling area circuits will be fitted with control valves to control each room’s temperature individually. In this case, Δp-c (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 cooling circuit cools a large thermal zone (e.g., a hall), the control valves on the underfloor cooling’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 = 15 °C … 40 °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 cooling, e.g. an air-conditioning device. The pressure-controlled Δp-v, Dynamic Adapt plus or temperature-controlled “Hall temperature T-const.” control modes can be used for this application.
Pressure control
If the cooling circuit supplies multiple rooms, the air-conditioning devices 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 cooling circuit cools a large thermal zone (e.g., a hall), the control valves on the air-conditioning devices are redundant and are often not present in existing buildings. The pump can then directly control the hall temperature to the desired setpoint T = 15 °C … 40 °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 as 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 (primary circuit) that supplies a hydraulic shunt with cooling. 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 “Feed temperature T-const.” control mode for this purpose.
2. The energy is to be transferred without lowering the return temperature even in the event of a reduced cooling requirement if at all possible. 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” 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 = 5 °C … 40 °C by adjusting the speed of the pump in front of the hydraulic 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. For this purpose, two temperature sensors (PT1000 or active sensor with current- or voltage-controlled signal) must be installed 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. As the setpoint configuration for ΔT occurs without a sign on the pump, the value is adjusted according to the direction of action.
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The pump is installed in a generator or feeder circuit (primary circuit) that supplies a heat exchanger with cooling. Heat exchangers are installed to separate two hydraulic systems and transfer thermal energy from one system to another. 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 adjusted accordingly. The Wilo-Stratos MAXO provides the “Feed temperature T-const.” control mode for this purpose.
2. The energy is to be transferred without lowering the return temperature even in the event of a reduced cooling requirement if at all possible. 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” and Multi-Flow Adaptation control modes for this purpose.
Temperature control: Constant secondary feed temperature T-const.
The feed temperature behind the heat exchanger (secondary side) is controlled to the defined setpoint T = 5 °C … 40 °C by adjusting the speed of the pump upstream of the heat exchanger (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.
Hall temperature control
The temperature difference between the heat exchanger primary and secondary feed is controlled to reach a defined setpoint ΔT = 2 K … 20 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 temperature sensor (PT1000 or active sensor with current- or voltage-controlled signal) in both the primary and secondary feeds. The sensor in the pump can be used for the primary side, meaning that the temperature sensor is connected to the pump on the secondary side. 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 feed on the secondary side and T2 in the feed on the primary 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.
