EU declaration conformity
Warm air heater controller | 2,5 A
Product description
This temperature-controlled, 5-step fan speed controller is designed for single-phase motors with a maximum combined current of 2.5 A at 230 VAC. It uses an external PT500 temperature probe and can operate an external hot water supply valve via its unregulated output.
In heating mode, the fan and output engage when the ambient temperature falls below the set point. The fan speed can be controlled manually or automatically, increasing as the temperature drops. The system turns off when the temperature exceeds the set point. The operation is reversed in cooling mode.
Utilizing autotransformer technology, the controller adjusts motor voltage in stages for quiet fan operation.
The unit's IP54-rated plastic enclosure is suitable for surface mounting in indoor environments.
Documents
Additional specifications and description
How is the ambient temperature measured?
Ambient temperature is measured via the PT500 temperature sensor. This temperature sensor is available in different enclosure types. PT500 temperature sensors are platinum resistance thermometers. Their output resistance value changes according to the measured temperature. At 0 °C a PT500 sensor has a resistance value of 500 Ohm. When the measured temperature increases, the output value increases. However, the cable of these sensors also has a resistance value. The longer the cable, the higher the resistance value. Excessively long cable lengths will therefore might influence the measured temperature. Therefore, it is advisable to keep cable lengths of this type of sensors limited. The longer the cable length, the higher the risk of faulty measurements and inaccuracies.

In heating mode, the unregulated output is activated when the ambient temperature is lower than the selected temperature. In cooling mode, the operation is inversed. In this application, the unregulated output controls the hot water supply valve (heating mode). The unregulated output is either ON (230 VAC) or OFF (0 VAC). The maximum current of the unregulated output is 2 A (resistive loads).
In heating mode, the unregulated output is typically used to control a water valve to regulate the flow of hot water or a relay to activated an electric heater. The unregulated output is activated simultaneously with the fan. When the fan runs, the heater is activated.
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