Envirostat FP6i 6kW 230V Frost Protection Controller with BMS Alarm

The Envirostat FP6i is an advanced electronic frost protection thermostat designed to provide reliable, energy-efficient protection for pipework and equipment exposed to freezing temperatures. Ideal for industrial, commercial, and outdoor installations, it controls electric heater tape and infrared (IR) quartz heaters to prevent frost damage while minimising energy consumption.

Featuring a built-in soft start function, encapsulated temperature sensor, IP65-rated enclosure, and comprehensive fault monitoring, the FP6i delivers dependable operation in demanding environments. Unlike the standard FP6E model, the FP6i also includes an integrated Building Management System (BMS) alarm relay, allowing remote fault monitoring and seamless integration into building control systems.

With automatic output testing, sensor monitoring, and output fault detection, the Envirostat FP6i provides enhanced reliability and peace of mind for critical frost protection applications.

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Key Features

• Energy-efficient frost protection controller
• Designed for heater tape and infrared (IR) quartz heaters
• Integrated Building Management System (BMS) alarm relay
• Soft start function reduces inrush current and extends heater life
• Built-in encapsulated 10kΩ NTC temperature sensor with 2m cable
• Adjustable temperature range from 0°C to +20°C
• IP65 weatherproof enclosure for indoor and outdoor installations
• 6kW switching capacity (25A maximum load)
• Automatic output and load fault detection
• Open and short-circuit sensor monitoring
• Automatic output self-test every four hours
• Power, output and alarm LED indicators
• Simple installation with rising clamp terminals
• Maintenance-free solid-state reliability

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Technical Specifications

Electrical

Supply voltage: 230V AC ±10%

Supply frequency: 50Hz

Maximum switching capacity: 6kW

Maximum load current: 25A

Current consumption: 16mA

Soft start duration: 1 second

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Temperature Control

Control range: 0°C to +20°C

Temperature accuracy: ±1°C

Sensor type: Encapsulated 10kΩ NTC thermistor

Sensor cable length: 2 metres

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Monitoring & Protection

Sensor monitoring

• Open circuit detection
• Short circuit detection
• Unit automatically shuts down on sensor fault

Output monitoring

• Open circuit load detection
• Open circuit semiconductor or relay detection
• Short circuit semiconductor or relay detection
• Automatic output self-test at power-up and every four hours

Alarm Indication

Temperature sensor faults: Fast flashing alarm LED

Output or load faults: Slow flashing alarm LED

Building Management System (BMS)

Normally energised alarm relay indicating healthy system status for remote monitoring.

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Terminal Connections

Supply terminals

0.2–6mm² rising clamp terminals

Sensor terminals

0.1–1.5mm² rising clamp terminals

Cable entry

10.5mm and 8mm cable glands

(Round cable must be used to maintain the IP65 rating.)

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Environmental

Ambient operating temperature

-20°C to +40°C

Ingress protection

IP65

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Mechanical

Dimensions

120mm (W) × 120mm (L) × 65mm (H)

Fixing centres

110mm × 90mm

4 × 4.8mm mounting holes

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Applications

Ideal for protecting exposed pipework and heating systems in:

• Industrial facilities
• Warehouses
• Commercial buildings
• Outdoor pipework
• Water treatment plants
• Plant rooms
• Process heating systems
• Loading bays
• Utility installations
• Cold storage facilities