Description

Envirostat FP4iR – 4kW Reverse Logic Frost Protection Controller with Alarm

The Envirostat FP4iR is a compact and energy-efficient reverse logic frost protection controller, engineered to work with fans in applications where they must switch off as ambient temperatures approach freezing. With a 4kW power capacity, soft start function, and built-in alarm features, the FP4iR provides robust protection for HVAC and pipework systems. Together with the FP4ER (basic model), it offers a reliable solution for frost protection in industrial and commercial environments.

The Envirostat FP4iR is designed for applications where fans must be switched off as temperatures approach freezing, making it ideal for HVAC, ventilation, and refrigeration systems. With a robust 4kW / 20A switching capacity, IP65 ingress protection, and a built-in encapsulated sensor, it ensures reliable frost protection even in harsh environments.

Featuring a soft start function to minimize inrush currents, the FP4iR extends the lifespan of connected equipment. Its reverse logic control and user-friendly setup make installation simple, while advanced monitoring features, including output & load fault detection and LED status indicators, provide peace of mind for operators.

United Automation’s Envirostat Frost Protection Controllers, including the FP4iR, are trusted across industries to prevent frozen pipes, protect HVAC and fan systems, and support facilities in the fight against Legionellaceae.

Applications

• Fan systems requiring reverse logic frost protection

• Industrial HVAC and ventilation systems

• Pipework and heater tape protection

• Refrigeration and cold storage units

• Building services where fans must be disabled near freezing temperatures

Features & Benefits

• Reverse logic operation – turns fans off near freezing point

• Simple installation with user-friendly setup

• Encapsulated 2m sensor for accurate temperature monitoring

• Soft Start function reduces inrush current at startup

• Adjustable range: -10°C to +10°C (0°C to +20°C optional)

• Solid state reliability – maintenance-free operation

• IP65 ingress protection – suitable for outdoor/harsh environments

• High current capacity – supports up to 20A / 4kW loads

• FP4iR exclusive features:

  • Output & load fault detection

  • Power & output LED indicators

Specifications

Typical Applications

• Fan-assisted HVAC systems

• Building ventilation and ducting systems

• Industrial refrigeration and cold rooms

• Pipe heating systems requiring reverse logic

• Commercial water and air distribution systems