At Nordik Radiant, we are thrilled to introduce the Wilo-Star E 21 to our range of hydronic circulator pumps. This innovative model, crafted by WILO USA, represents a significant leap forward in hydronic heating and cooling technology. Let’s delve into what makes this pump stand out and how it can benefit residential and commercial HVAC systems alike.
Key Features
- High-efficiency, EC Motor-driven technology
- Differential temperature control
- Auto mode: Automatically adjusts to the system demand
- Three (Head Defined) HD modes –proportional control
- Four speed control
- LED display and adjustment buttons for easy set-up and changes
Nomenclature
Technical data
| Technical Data | |
| Ambient Temperature Range | 0°F - 104°F |
| Max Relative Humidity | 95% |
| Degree Of Protection | IP42 |
| Max Flow | 4.5 Gallons Per Minute |
| Max Head | Max. 21 ft (6.4 m) |
| Max Dba | 42 |
| Max System Pressure | 145 PSI (10 BAR) |
| Fluid Temperature Range | 36°F - 230°F |
| Supply Voltage | 115V |
| FLA Rating | .65A |
| Flange-To-Flange Spacing | 6-3/8 inches (162mm) |
| Pump Housing | Cast Iron HT 200 With Cataphoresis Coating |
| Stator Housing | Cast Aluminum ALSI9CU3 |
| Connection Type | Flanged Connection |
| Approvals | cULus and CSA |
Interface and Operation
The Wilo-Star E 21 features convenient access to its primary parameters via an LCD display accompanied by three press buttons:
- An upward arrow for increasing settings
- A downward arrow for decreasing settings
- A dedicated Set buttons
The Wilo-Star E 21 provides versatile control with four distinct modes tailored to meet various operational needs:
Constant Speed Control:
Allows selection from four fixed speeds to maintain consistent circulation as per requirements.
To activate Constant Speed Mode on the Wilo-Star E 21, follow these simple steps:
- Press and hold the “Set” button until the screen displays “Delta-T mode”.
- Use the “Down” arrow to switch the mode from Delta-T mode to “Constant Speed Mode”.
- Press the “Set” button again. You will now see the default setting “Speed 4” flashing on the screen.
- Adjust the desired speed curve using the “Up” and “Down” arrows.
- Press the “Set” button to confirm your selection and exit the setting.
In Constant Speed Mode, the pump operates at a fixed speed when triggered by a thermostat signal to activate the boiler. You can choose from four available speeds to optimize performance according to your system’s requirements.
For detailed performance characteristics and specific speed settings, please refer to Figure 8 on page 5 of the performance curves section in the Wilo-Star E 21 documentation. This mode ensures efficient and reliable operation tailored to your heating system’s needs.
HD (Head Defined) Control:
Offers three proportional settings based on system pressure to optimize performance.
To activate HD Mode (Head Defined) on the Wilo-Star E 21 and adjust its settings, follow these steps:
- Press and hold the “Set” button until the screen shows the current mode (e.g., “Constant Speed Mode”).
- Use the “Down” arrow to navigate to “HD Mode” and then press the “Set” button to select it.
- Once in HD Mode, the screen will display the available performance curves (typically three options).
- Refer to Figure 8 on page 5 of the performance curves section in the Wilo-Star E 21 documentation to choose the appropriate curve based on your system’s requirements.
- Adjust settings within the chosen performance curve by using the “Up” and “Down” arrows to set the desired maximum head in relation to the flow.
- Press the “Set” button to confirm your selection and exit the setting.
In HD Mode, the pump operates at variable speeds to optimize performance while ensuring the maximum head remains within specified limits relative to the flow rate. This mode offers flexibility and efficiency tailored to your HVAC system’s demands. For detailed performance characteristics and specific settings, consult the performance curves provided in the product documentation.
Differential Temperature Control:
Adjusts circulation based on temperature differentials within the system, ensuring efficient operation.
Setting Differential Temperature Control:
- Press and hold the “Set” button on the pump.
- Use the “Up” and “Down” arrows to navigate to “Differential Temperature Control” mode.
- Press the “Set” button to select and confirm the mode.
- Once in this mode, adjust the temperature differential setting using the “Up” and “Down” arrows to match your system’s requirements.
- Press the “Set” button again to save your settings and exit the configuration.
In this mode, the pump adjusts its speed based on the temperature variance between the supply and return lines within the heating system. By consistently monitoring and maintaining a specific temperature differential, this approach optimizes the efficiency of the system while ensuring reliable and uniform heating performance. Adjusting the pump speed in direct response to these temperature differences helps to minimize energy consumption and maximize the overall effectiveness of the heating system.
Auto-Mode Control:
Automatically adjusts pump speed to meet changing system demands, optimizing energy usage.
Here’s how to access and configure each of the following mode on the Wilo-Star E 21 circulator pump:
Auto Mode:
- Press and hold the “Set” button.
- Use the “Up” and “Down” arrows to navigate to “Auto mode”.
- Press the “Set” button to select and confirm. The pump will adjust its speed based on system resistance, optimizing efficiency without using temperature probes.
SP Heat Mode (Set Point Heat Mode):
- Press and hold the “Set” button.
- Use the “Up” and “Down” arrows to navigate to “SP Heat mode”.
- Press the “Set” button to select and confirm. The pump will slow down if the supply temperature exceeds the setpoint.
SP Cool Mode (Set Point Cool Mode):
- Press and hold the “Set” button.
- Use the “Up” and “Down” arrows to navigate to “SP Cool mode”.
- Press the “Set” button to select and confirm. The pump will speed up if the supply temperature exceeds the setpoint.
BP Mode (Boiler Protection Mode):
- Press and hold the “Set” button.
- Use the “Up” and “Down” arrows to navigate to “BP Mode”.
- Press the “Set” button to select and confirm. The pump will adjust its speed based on the return line temperature to protect the boiler.
Set Up Mode:
- Press and hold the “Set” button.
- Use the “Up” and “Down” arrows to navigate to “Set Up mode”.
- Press the “Set” button to enter the mode, where you can adjust language and read-out units as needed.
Each mode offers specific functionalities tailored to optimize the performance of the Wilo-Star E 21 circulator pump according to varying system requirements. For detailed performance curves and further configuration options, refer to Figure 8 on page 5 of the product’s performance curves section.
These comprehensive control modes ensure flexibility and efficiency in managing heating and cooling systems with precision.
Temperature Probe
When utilizing differential temperature as the method of control with the Wilo-Star E 21 circulator pump, it's essential to correctly position the temperature probes for accurate readings. Here’s a guide to ensure proper setup:
Probe Placement: Attach the temperature probes securely to the supply and return piping of your heating system. Refer to the above figure.
Securing Probes: Use zip ties or other appropriate fasteners to secure the probes firmly in place. This ensures that they accurately measure the temperature differentials between the supply and return lines, which is crucial for the pump to operate effectively in differential temperature control mode.
If you encounter issues during installation, such as insufficient wire length to attach the probe to the return piping, consider switching the control mode from Delta-T mode to Auto mode. This mode adjusts the pump’s speed based on system resistance without relying on temperature probes, providing an alternative method of control.
Proper placement and secure attachment of temperature probes help maintain optimal system performance by ensuring accurate temperature readings. This, in turn, allows the pump to adjust circulation speed efficiently, enhancing energy efficiency and overall system operation.
By following these guidelines for probe placement and control mode selection, you can effectively utilize the differential temperature control feature of the Wilo-Star E 21 pump to maximize system efficiency and comfort in your heating applications.
How the use of the temperature probe enhance performance
In the Wilo-Star E 21 circulator pump, temperature probes serve crucial roles in monitoring and optimizing system performance. Here are the main purposes for which probes are used:
Temperature Monitoring: The pump utilizes temperature probes to measure and monitor temperatures within the heating system. This information is crucial for ensuring that the system operates within optimal temperature ranges for efficiency and comfort.
Control Modes: Some operating modes, such as Set Point Heat Mode and Set Point Cool Mode, utilize temperature probes to adjust the pump's speed based on the temperature readings. For example, in Set Point Heat Mode, the pump slows down if the supply temperature exceeds the setpoint, as detected by the probes.
Boiler Protection: In Boiler Protection Mode, temperature probes are used to monitor the return line temperature. The pump adjusts its speed accordingly to prevent overheating of the boiler, ensuring safe and efficient operation.
Differential Temperature Control: Temperature probes play a role in Differential Temperature Control mode by measuring the temperature differentials between the supply and return lines. This information helps the pump optimize its speed to maintain a consistent temperature differential, enhancing energy efficiency and system performance.
System Optimization: Overall, temperature probes contribute to the pump's ability to operate intelligently and adaptively. They enable the pump to respond dynamically to changes in system conditions, ensuring optimal performance while maximizing energy savings.
By leveraging temperature probes, the Wilo-Star E 21 enhances reliability, efficiency, and comfort in heating systems by continuously monitoring and adjusting operations based on real-time temperature data.
Why Choose Nordik Radiant?
As a leading provider in the hydronic heating, Nordik Radiant is committed to offering cutting-edge solutions that enhance comfort and efficiency. The addition of the Wilo-Star E 21 to our product range underscores our dedication to providing customers with top-tier technology that meets the highest standards of performance and reliability.
Experience Excellence
Explore the possibilities with the Wilo-Star E 21 and see how it can elevate your HVAC systems to new heights of efficiency and performance. For more information on this innovative pump, including technical specifications and how to incorporate it into your projects, visit Nordik Radiant’s website or contact our knowledgeable team today.
