Products catalog

Home/Product Catalog/HVAC control solutions for heating and ventilation/HVAC automation/Sensors and detectors/Temperature sensors and thermostats
  • New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM
    New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM 1
    New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM 2
    New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM 3
    New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM 4
    New item   -178.38€Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM 5

    Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM

    Code: FCCA8-DM
    Inquire about this item
    Price 318.53 € VAT incl.
    ( 263.25 € VAT excl. )
    496.91 € You save 178.38 €
    Offer is valid until 2026-12-31
    Want another price? Suggest yours!
  • Product description

    Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM

    FCCA8-DM – a Sentera Controls free cooling controller: based on two PT500 sensors (outdoor and indoor) it switches on the fan and opens the damper when the outdoor air is cooler than the room air, thus cooling the room without air conditioning. The analog output controls the fan speed, the relay – the damper. Supply 85–264 VAC.

    Key idea:
    Cool outdoor air is a free source of cooling. The controller itself compares room and outdoor temperatures and uses outdoor air only when it makes sense – fewer air conditioner operating hours and lower electricity consumption.
    Inputs
    2 × PT500 (outdoor / indoor)
    Fan output
    0-10 / 2-10 / 0-5 VDC, 0-20 / 4-20 mA, PWM
    Relay
    2 A, damper
    Supply / protection
    85–264 VAC, IP54

    Operating principle

    The controller is wall-mounted and powered with 85–264 VAC (L, N, PE). Two PT500 sensors are connected (TEMP1 – outdoors, TEMP2 – indoors), the fan control signal (AO1, GND), a relay for the air damper (NO, COM) and, if required, Modbus RTU (A, B); the 24 VDC / 500 mA output can power an external device.

    Free cooling starts when the room is more than 1 °C warmer than the setpoint, the room-to-outdoor difference exceeds the set value (HR62) and it is above +5 °C outdoors; it stops when the room cools to 1 °C below the setpoint, the difference falls to 1 °C or the outdoor temperature drops below +4 °C. The relay opens the damper before the fan starts and closes it after the fan stops; the fan runs at variable or fixed speed, Boost is activated with a button, and the output type (0-10, 2-10, 0-5 VDC, 0-20, 4-20 mA or PWM) is selected via Modbus.

    Result – the room is cooled with free outdoor air whenever possible, and the air conditioners work less. In the event of a fault the output drops to 0 % and the relay is switched off; after recovery there is a 20 s delay, and more than 10 alarms lock the unit until the power is cycled; the status is visible on an RGB LED.

    Benefits FCCA8-DM?
    A ready free cooling algorithm with damper control, a Boost button and Modbus RTU in one IP54 housing – no need to program a PLC.

    Technical specifications

    Product type Free cooling controller
    Manufacturer / code Sentera Controls / FCCA8-DM
    Purpose Fan and damper control for free cooling with outdoor air
    Temperature inputs 2 × PT500: TEMP1 – outdoor, TEMP2 – indoor (sensors ordered separately)
    Analog output AO1 0-10 VDC (default), 2-10, 0-5 VDC (RL ≥ 1 kΩ); 0-20, 4-20 mA (RL ≤ 500 Ω); PWM 1 kHz push-pull 12 VDC or open collector (≤ 12 VDC)
    Relay output NO / COM, 2 A (resistive load); air damper
    Power output 24 VDC, 500 mA for an external device
    Supply voltage 85–264 VAC, 50–60 Hz (L, N, PE)
    Modes Variable / fixed speed, Boost, Override
    Local control Boost button, RGB status LED
    Communication Modbus RTU (RS485), A, B; Cat5 / EIB cable; SenteraWeb via the Sentera internet gateway
    Housing ABS plastic, grey (RAL 7035)
    Protection class IP54
    Operating conditions -10…+60 °C, 15–90 % rH non-condensing
    Storage conditions 0…+20 °C, 15–80 % rH
    Weight 0.93 kg (net)
    Compliance LVD 2014/35/EU, EMC 2014/30/EU, WEEE 2012/19/EU, RoHS (EU) 2015/863

    Main functions

    • Free cooling logic – start and stop according to the room setpoint, the difference between room and outdoor temperatures, and the outdoor temperature.
    • Damper control – the relay opens the damper before the fan starts.
    • Boost – with a button or via Modbus – temporarily increased speed for an adjustable time.
    • Universal analog output – suitable for EC motors and AC fan speed controllers with an analog input.
    • Override via Modbus – the speed can be set from the BMS independently of the automatic logic.
    • Alarm management – on a fault the outputs are switched off, on repeated faults – lockout.
    • 24 VDC output – up to 500 mA to power an external device.
    • SenteraWeb – via a Sentera internet gateway – remote monitoring and settings.

    Where is it used?

    • Server and telecommunications rooms
    • Technical rooms with heat-emitting equipment
    • Warehouses and production premises
    • Offices and retail areas in the transitional season
    • Buildings where air-conditioning operating time is to be reduced
    • Electrical switchrooms and transformer rooms with heat dissipation
    • Mobile communication and data transmission containers

    On-demand operation

    For server and telecommunications room caretakers.
    Cooling with outdoor air continues as long as it is above +5 °C outdoors and the temperature difference is sufficient, so the air conditioner runs for shorter periods.
    For HVAC commissioning engineers.
    The damper opening time, the HR62 difference and the output type are set via Modbus RTU for the specific site.
    For technical room ventilation installers.
    A single device controls both the fan and the damper via a relay, no additional logic needed.

    Practical application

    If the temperature in a server room is 1 °C above the setpoint and it is +12 °C outdoors, then the FCCA8-DM first opens the air damper with its relay and, after the set time, starts the fan, which is stopped when the room has cooled to 1 °C below the setpoint.

    Application guide: how it is used in practice

    The FCCA8-DM adapts to different sites – only what is connected to its outputs changes:

    Site What is connected Result Installer's note
    Server room AO1 → EC exhaust fan; relay → supply damper; PT500 – outdoor and indoor Cooled with outdoor air, so the air conditioner runs less often Install the outdoor sensor in shade
    Technical room with an AC fan AO1 → AC fan speed controller Fan speed according to cooling demand Select the signal type via Modbus
    A simple fixed-speed solution HR84 > 0 % – fixed speed The fan is only switched on / off according to conditions Suitable for simple fans with a speed controller
    Short-term intensive ventilation Boost button Temporary increased speed with automatic return Duration is set via HR85
    Building with BMS Modbus RTU → A, B Status, alarms and Override from the BMS Cat5 / EIB cable

    How to choose a controller

    Task Recommended model
    Returning warm air from the ceiling downwards (high rooms, warehouses, workshops) DSCA8-DM (destratification controller)
    Cooling the room with cooler outdoor air without air conditioning FCCA8-DM (free cooling controller) ← this model
    Rule: choose the controller according to the task: heat recovery from the ceiling – DSCA8-DM, cooling with outdoor air – FCCA8-DM. Both require two PT500 sensors (ordered separately) and a fan with an analog control input (EC motor or AC speed controller).
    When to choose another solution: PT500 sensors are ordered separately (Sentera PT500 series); for AC fans – speed controllers with an analog input; for heat recovery from the ceiling – DSCA8-DM.

    Pros

    • A ready control algorithm with no PLC programming
    • Universal analog output, including 4-20 mA and PWM
    • Relay for a damper
    • 24 VDC / 500 mA output for an external device
    • Modbus RTU and SenteraWeb option
    • IP54 enclosure, supply 85–264 VAC

    Cons / limitations

    • PT500 sensors are not included – order them separately
    • One analog output – all fans are controlled by the same signal
    • Relay 2 A – an intermediate contactor is required for a higher load
    • Many settings (limits, times) can be changed only via Modbus RTU

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician / automation specialist with the power disconnected.
    • Supply voltage 85–264 VAC: hazardous voltage on terminals L, N, PE; protective earthing is required.
    • Relay contact load – no more than 2 A resistive load.
    • Route PT500 sensor cables separately from power cables, avoid loops and unnecessary connections.
    • Resetting the Modbus communication parameters – with a jumper on PROG pins 1 and 2 for at least 5 s.

    Quick selection guide

    2 × PT500
    0-10 VDC / 4-20 mA / PWM
    Relay 2 A
    Modbus RTU
    85–264 VAC
    IP54
    Suitable when you need:
    • to cool a room with outdoor air when it is cooler;
    • to control a fan and damper with one controller;
    • to reduce air conditioning run time.
    Check before use:
    • whether the fan has an analog control input (EC) or an AC speed controller is used;
    • whether two PT500 sensors have been ordered;
    • the relay load (up to 2 A).
    Important reminder: The FCCA8-DM is a controller: it generates a control signal but is not a fan power regulator; the PT500 sensors are ordered separately.

    FAQ

    Are the sensors included in the kit?
    No, two PT500 sensors are required, ordered separately.
    Which fans can be controlled?
    EC motors with an analog input and AC fans via a speed controller with an analog input.
    How do I change the output signal type?
    Via Modbus RTU (0-10 VDC by default).
    Is a computer needed for commissioning?
    No, main operation is with factory settings; the status is shown by the RGB LED, with a button on the unit.
    What happens in case of a fault?
    The analog output drops to 0 % and the relay switches off; after more than 10 alarms – lockout until the power supply is cycled.
    How do I connect to the internet?
    Via the Sentera internet gateway to the SenteraWeb cloud.

    Free cooling controller | 2×PT500 inputs | 0-10VDC/4-20mA/PWM | relay 2A | Modbus RTU | 85-264VAC | IP54 | Sentera Controls | FCCA8-DM

    Sentera FCCA8-DM – free cooling controller with two PT500 inputs, 0-10 VDC / 4-20 mA / PWM analog output, 2 A relay and Modbus RTU, 85–264 VAC supply, IP54. Cools rooms with outdoor air without air conditioning.

    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.

  • Subscribtion to new arrivals

    privacy policy

    Information