Krystal Digital Dual Fan Control

The Krystal Dual Fan Speed Controller is a thermostatic ventilation controller designed to manage an intake fan and extraction fan together, automatically adjusting ventilation according to the measured temperature.

With two independently adjustable fan-speed controls, the Krystal controller allows the balance between intake and extraction airflow to be set while its remote temperature sensor monitors the environment. Set the required target temperature and the controller automatically manages the connected fans to help maintain a more stable environment.

Two UK power outlets are built directly into the controller, providing dedicated connections for the intake and extraction fans. Each outlet can control a compatible fan with a maximum power of 320W.

A digital temperature display and LED indicators provide an immediate view of target and current temperatures, making the Krystal Dual Fan Speed Controller a straightforward solution for automated ventilation without the complexity of a larger environmental-control system.

Why choose the Krystal Dual Fan Speed Controller?

• Controls two fans - dedicated power outlets allow an intake and extraction fan to be controlled from one unit.
• Automatic temperature control - set the required temperature and the controller adjusts ventilation accordingly.
• Independent fan-speed adjustment - intake and extraction speeds can be balanced to suit the ventilation system.
• Negative-pressure control - the difference between intake and extraction airflow can be adjusted to help maintain the required pressure balance.
• Remote temperature sensor - measures conditions within the controlled environment rather than at the controller itself.
• Digital temperature display - provides clear temperature information during setup and operation.
• LED status indicators - provides quick visual feedback from the controller.
• Up to 320W per outlet - each fan output supports a compatible fan up to the specified maximum power.
• Helps reduce unnecessary fan noise - fans do not need to operate continuously at maximum speed when full airflow is unnecessary.
• Plug-in installation - designed as a straightforward controller for compatible mains-powered ventilation fans.

Automatic temperature-based ventilation

Temperature can change substantially as lighting, external weather and other environmental conditions change. A ventilation system running at one fixed speed cannot respond automatically to those variations.

The Krystal Dual Fan Speed Controller uses its temperature sensor to continuously monitor the environment. Once the required target temperature has been selected, the controller adjusts the connected fans accordingly.

This allows ventilation to respond to environmental demand rather than requiring repeated manual adjustment of the fans.

The result is a more controlled approach to air exchange, particularly where extraction is the primary method used to remove excess heat.

Control intake & extraction together

The controller provides two mains power outlets, allowing both sides of a balanced ventilation system to be managed from the same unit.

Extraction fan

The extraction fan removes warm air from the controlled environment and provides the primary air exchange.

Intake fan

The intake fan supplies replacement air as the extraction system removes air from the environment.

Using both fans through one controller allows their operation to be coordinated while still giving the user control over the balance between intake and extraction airflow.

Adjustable airflow & negative pressure

Intake and extraction systems do not necessarily need to operate at identical airflow rates. In many filtered extraction systems, slightly greater extraction than intake is desirable to maintain negative pressure.

The Krystal controller provides separate adjustment for the two connected fans, allowing the intake/extraction balance to be tuned for the installation.

Actual pressure balance will depend on the fans themselves as well as carbon filters, duct length, bends, intake restrictions and other components in the ventilation system.

Fan-speed settings should therefore be adjusted according to the behaviour of the complete installed system rather than simply setting both controls to identical positions.

Reduce unnecessary ventilation noise

A ventilation fan normally produces more motor and airflow noise as its speed increases. Running both intake and extraction fans at maximum output continuously can therefore create considerably more noise than necessary.

By allowing fan speeds to be adjusted and ventilation to respond to temperature, the Krystal controller can help avoid unnecessarily high airflow when environmental demand is lower.

For further noise reduction, combine correctly controlled fan speeds with appropriately sized ducting, smooth airflow routes, vibration isolation and acoustic ducting where required.

Temperature sensor for accurate control

The supplied temperature sensor should be positioned in a representative part of the controlled environment so the controller receives a useful indication of the temperature experienced by the crop.

Avoid positioning the sensor directly beside heaters, lighting equipment, air intakes or extraction points, as these can produce localised temperatures that do not represent the wider environment.

Keeping the sensor away from direct radiant heat and strong airflow will generally provide a more representative measurement for automatic fan control.

Fan compatibility

The Krystal Dual Fan Speed Controller is intended for compatible mains-powered AC ventilation fans that can be controlled using this type of fan-speed controller.

Each outlet supports a fan with a maximum specified power of 320W. Always check the fan manufacturer's electrical and speed-control requirements before connecting equipment.

This is not an EC signal controller. EC fans that require a dedicated 0-10V, PWM, digital or manufacturer-specific low-voltage control signal should be used with the appropriate EC fan controller instead.