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  • New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22
    New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22 1
    New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22 2
    New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22 3
    New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22 4
    New item   -295.24€Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22 5

    Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22

    Code: GTH21100L22
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  • Product description

    Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22

    GTH21100L22 – Sentera Controls transformer controller of fan speed and water heater valve according to temperature, for single-phase 230 VAC voltage-controllable motors up to 10 A. It has heating / ventilation modes, a 230 VAC output for a hot water valve and a Modbus RTU interface (SenteraWeb).

    Key idea:
    Controller for an air heater or ventilation unit: it controls the fan speed according to temperature and opens the hot water valve. It can operate standalone or be monitored and configured via Modbus RTU / SenteraWeb.
    What it is for GTH21100L22:
    This model is designed for high-power fans (up to 10 A) – industrial fans in production halls, warehouses, farm buildings or a larger group of fans.
    Max. motor current
    10 A
    Valve
    230 VAC / 2 A output
    Control
    According to temperature 5–35 °C, Modbus RTU
    Protection
    IP54, metal enclosure

    Operating principle

    The controller is wall-mounted in a metal enclosure. Connected are the 230 VAC supply (L, N, PE), the motor (U1, U2), the hot water valve to the unregulated output (L1, N, PE; 230 VAC / 2 A), an external PT500 temperature sensor (TEMP; not included) and, as needed, the Modbus RTU line (A, B).

    The heart of the controller is an autotransformer with several taps (steps). Each step supplies the motor with a different fixed voltage, while the output voltage remains SINUSOIDAL, as in the mains. As a result, the motor runs quietly even at low speed – the transformer speed controller is also suitable for motors that hum or heat up with an electronic (semiconductor) controller.

    The 7-position selector switch selects: off, five manual steps or automatic mode. Output voltages – 0-(80)-110-140-170-190-230 VAC (the 80 VAC tap is present but not connected). In automatic mode the speed is changed in steps within the proportional band (1–10 °C) around the setpoint of 5–35 °C.

    In heating mode, when the temperature is below the setpoint, the fan runs and the valve output is on (230 VAC); when the set temperature is reached, the motor is switched off and the valve is closed. In ventilation mode the logic is reversed. The mode is selected with a jumper on the board or via Modbus. In manual mode the speed is set manually, but the motor only runs when the temperature condition allows it.

    Benefits GTH21100L22?
    Fan, hot water valve and Modbus integration in one metal IP54 enclosure – simple water air heater control without a separate thermostat.

    Technical specifications

    Product type Temperature-based transformer fan speed and water heater controller
    Manufacturer / code Sentera Controls / GTH21100L22
    Series GTH21 (7.5 / 10 A)
    Supply voltage 230 VAC, 50–60 Hz
    Max. motor current 10 A
    Output voltage steps 0 – (80) – 110 – 140 – 170 – 190 – 230 VAC (80 VAC tap not connected)
    Output voltage waveform Sinusoidal (autotransformer)
    Modes 7-position selector switch: off, 5 manual steps, automatic
    Operating logic Heating / ventilation – jumper on the board or Modbus
    Valve output Unregulated 230 VAC, 2 A (for a hot water valve)
    Temperature setpoint 5–35 °C, in 1 °C increments, potentiometer
    Proportional band 1–10 °C
    Temperature sensor External PT500 (not included)
    Communication Modbus RTU (RS485, A/B), SenteraWeb cloud platform
    Indication LEDs on the board: status and valve output
    Fuse 5×20 mm, T-12.5 A-H
    Housing Metal (steel), powder-coated RAL 7035
    Protection class IP54 (EN 60529)
    Operating environment -10…+35 °C, < 95 % rH non-condensing
    Terminals Up to 2.5 mm²
    Packaging dimensions 330×300×190 mm
    Weight 12.50 kg net / 12.94 kg gross
    Compliance LVD 2014/35/EU (EN 60730-1), EMC 2014/30/EU (EN 61000-6-1, EN 61000-6-3), RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • Speed according to temperature – stepped automatic control within a proportional band of 1–10 °C.
    • Water heater valve – 230 VAC / 2 A output opens the valve according to temperature.
    • Heating / ventilation mode – reverse logic is selected with a jumper or via Modbus.
    • Modbus RTU and SenteraWeb – remote monitoring and parameter changes.
    • Manual mode – 5 steps and OFF position.
    • Sinusoidal output voltage – quiet motor operation.

    Where is it used?

    • Warehouses, workshops and production premises with water air heaters
    • Greenhouses
    • Stables and other farm buildings
    • Ventilation systems with a water heater and a single-phase AC fan

    On-demand operation

    For the heating and ventilation installer.
    The fan and valve are controlled according to a single temperature setpoint.
    For the electrician.
    Clear terminals (L/N/PE, U1/U2, L1, TEMP, A/B), metal IP54 enclosure.
    For the facility administrator.
    Parameters are monitored and changed via Modbus RTU or SenteraWeb.

    Application guide: how it is used in practice

    Typical GTH21100L22 applications:

    Site What is connected Result Installer's note
    Warehouse with a water air heater Heater fan → U1, U2; valve → L1; PT500 → TEMP Cold – the fan runs and the valve is open; warm – switched off Heating mode (jumper)
    Greenhouse ventilation Fan → U1, U2; PT500 → TEMP As the temperature rises, the fan switches on and speeds up Ventilation mode – reverse logic
    BMS integration Modbus RTU → A, B Remote monitoring and settings Modbus settings reset – jumper 1–2, ≥ 15 s
    Stable, farm building Fan → U1, U2; sensor – in the livestock zone The set temperature is maintained PT500 sensor purchased separately

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 7.5 A GTH21-75L22 (7.5 A)
    7.5–10 A GTH21100L22 (10 A) ← this model
    Rule: controller max. current ≥ rated current of the motor (or the sum of several motors) from the motor nameplate. For a transformer controller the motor starting current is already taken into account by the manufacturer, so no additional margin is needed. Connect several fans only with AC motors of the same type that are voltage-controllable.
    When to choose another solution: electric heater – GTTE1 series; fan only, temperature-based, with integrated sensor – GTT-1 series; stepless 0-10 VDC control – electronic EVS-1 series.

    Pros

    • Control of the fan and the water heater valve
    • Heating / ventilation modes
    • Modbus RTU and SenteraWeb
    • Wide setting range 5–35 °C
    • Sinusoidal output voltage – quiet operation
    • Metal IP54 enclosure

    Cons / limitations

    • Step, not stepless control
    • PT500 sensor not included
    • The valve is controlled by on / off only (230 VAC), not 0-10 VDC
    • Heavy weight (12.50 kg)
    • No TK terminals and no alarm output
    • Single-phase voltage-controllable AC motors only; not suitable for EC fans

    Safety and installation notes

    • Installation and connection must be carried out by a qualified electrician with the power disconnected.
    • Always connect the protective earth (PE).
    • The total rated current of the connected motors must not exceed 10 A.
    • Replace the fuse only with one of the same type and rated current as specified in the datasheet.
    • Valve output load – no more than 2 A.
    • Wire cross-section at the terminals – up to 2.5 mm².
    • Use in clean air, free of aggressive and flammable gases; operating environment -10…+35 °C.

    Quick selection guide

    10 A
    230 VAC
    Water valve
    Modbus RTU
    IP54
    Suitable when you need:
    • control of a water air heater with a fan up to 10 A;
    • temperature-based fan control in heating or ventilation mode;
    • sites with Modbus / SenteraWeb monitoring.
    Check before use:
    • the motor rated current and whether it is voltage-controllable;
    • the valve actuator type (230 VAC on / off, up to 2 A);
    • whether you have a PT500 sensor;
    • the ambient temperature (-10…+35 °C).
    Important reminder: GTH21100L22 does not control EC fans, three-phase motors or 0-10 VDC valves; the PT500 sensor is purchased separately.

    FAQ

    Is the sensor included?
    No, an external PT500 sensor is required, connected to the TEMP terminals.
    How is the water valve controlled?
    via a 230 VAC / 2 A output: in heating mode it switches on when the temperature is below the setpoint and switches off once the setpoint is reached.
    Can it control a 0-10 V valve?
    No, the valve output is 230 VAC on / off switching.
    Can it be connected to a BMS?
    Yes, via Modbus RTU (RS485); parameters can also be monitored via SenteraWeb.
    What is the difference between heating and ventilation modes?
    In heating mode the fan runs when it is too cold; in ventilation mode – when it is too warm.

    Temperature-based transformer fan speed and water heater controller | 10A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTH21100L22

    Sentera GTH21100L22 – temperature-based transformer controller for fan and water heater, up to 10 A, 230 VAC, 2 A valve output, Modbus RTU, SenteraWeb, IP54.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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