EVOSTA2 20-75/130 SOL (1/2") Electronic circulator for solar systems DAB.EVOSTA2 SOL

Product detailed description

Electronic circulators are essential components in solar thermal systems where precise control of fluid flow is required to optimise energy transfer and system efficiency. These systems are typically found in residential and commercial buildings equipped with solar collectors for water heating or space heating applications. Installers working in such environments need reliable circulators that can adapt to fluctuating thermal loads and maintain consistent performance under varying operating conditions.

The EVOSTA2 20-75/130 SOL (1/2 inch) is specifically designed for integration into solar thermal circuits. It supports both passive and active solar systems and is suitable for installations where variable-speed flow control is necessary. The pump ensures efficient operation by adjusting its performance in response to pressure changes within the system, making it ideal for systems with dynamic thermal demands.

Technical parameters

Maximum working pressure	10 bar (1000 kPa)
Voltage	1x230 V/50/60 Hz
Operating range	from 0 to 4 m³/h with a head up to 14.5 m
Fluid temperature range	from -10 °C to + 110 °C (130 °C at 60 °C ambient temperature)
Protection class	IPX4
Insulation class	F
Code	60188450
Brand	IVAR

The technical parameters define the operational envelope and compatibility of the pump with specific system configurations. For example, the maximum working pressure of 10 bar (1000 kPa) ensures the pump can handle typical pressures encountered in closed-loop solar systems. The temperature range from -10°C to +110°C (up to 130°C at 60°C ambient) allows operation in both cold and hot climates, which is crucial for year-round performance. The flow rate range of 0 to 4 m³/h with a head of up to 14.5 m provides flexibility for system designers to match the pump to the required hydraulic load.

Installation and connection

Installation of the EVOSTA2 20-75/130 SOL requires careful planning to ensure correct orientation and secure mounting. The pump must be installed in a horizontal position with the motor shaft aligned horizontally. Connection is made via 1/2 inch threaded ports, and the pump includes a built-in bleed screw for air removal during commissioning. A 1.5 m power cable is provided for external signal control using PWM.

Key checkpoints include verifying the direction of flow, ensuring proper alignment with the piping, and confirming that the pump is mounted in a location free from excessive vibration or mechanical stress. Common installation errors include incorrect orientation of the pump body or failure to properly bleed the system, both of which can lead to reduced efficiency or mechanical failure.

Compatibility and accessories

The EVOSTA2 20-75/130 SOL is compatible with standard solar thermal systems that require variable-speed flow control. It integrates seamlessly with solar collectors, heat exchangers, and buffer tanks. For installations requiring remote control, an external PWM signal can be used to adjust pump speed. Additional accessories such as pressure gauges or flow meters may be required for system monitoring, depending on the application.

Technical background for designers

The EVOSTA2 20-75/130 SOL operates using a permanent magnet synchronous motor controlled by an internal frequency converter. This design allows for smooth and continuous adjustment of flow rates in response to pressure fluctuations, ensuring optimal energy efficiency. The pump housing is made from cast iron with cathodic protection coating, while the casing is constructed from stainless steel, providing resistance to corrosion and mechanical wear.

Integration into a solar system requires consideration of the thermal expansion characteristics of the piping and the overall hydraulic balance of the circuit. The pump’s ability to self-adjust to changing conditions reduces the need for manual intervention and extends the system’s operational life. Long-term efficiency is influenced by factors such as the cleanliness of the circulating fluid and the absence of chemical imbalances or particulate matter.

Service and operation

Regular inspection of the pump’s operating condition is recommended to ensure continued performance. Key checkpoints include verifying the integrity of the motor coupling, checking for unusual noise or vibration, and ensuring that the pump remains free from air pockets. No scheduled service intervals are specified in the technical documentation, but any signs of mechanical wear or performance degradation should prompt further investigation.

Maintenance typically involves cleaning the pump housing and inspecting the bleed screw for blockages. If the pump is to be operated in extreme temperature conditions, additional precautions should be taken to prevent freezing or overheating of internal components.

Frequently asked questions

Can the EVOSTA2 20-75/130 SOL be connected to an external PWM controller?
Yes, the pump is designed to accept an external PWM signal for speed control via the included 1.5 m power cable.

Is the pump suitable for use with glycol-based fluids?
Yes, the pump can operate with glycol-based fluids as long as the concentration does not exceed 50%.

What is the maximum allowable temperature of the circulating fluid?
The pump is rated for fluid temperatures up to +110°C, with an exception of +130°C at 60°C ambient temperature.

Can the pump be installed vertically?
No, the pump must be installed in a horizontal position with the motor shaft in a horizontal orientation.