Atrea DUPLEX RD5
Heat recovery ventilation unit with remote performance, mode and temperature control.
The Atrea DUPLEX with RD5 control is a heat recovery ventilation unit that supplies fresh air and extracts used air in homes, schools and offices. This Modbus TCP template reads air temperatures, air flows, mode and all alarms, and lets you set the required performance, operating mode and temperature from ModbusCloud.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 117, read and write
- Brand
- Atrea
- Key readings
- Supply air temperature · Outdoor air temperature · Indoor air temperature · Supply and exhaust flow · Desired mode · Alarms and warnings
- Available commands
- Required performance · Desired mode · Required temperature · Required zone · Season
- Compatible models
- DUPLEX units with RD5 control · DUPLEX EC5 · DUPLEX ECV5 · DUPLEX Multi · DUPLEX Pro
- Last updated
Registers (117)
117 read, 13 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Outdoor Air Temperature | °C | Read | |||
| Supply Air Temperature | °C | Read | |||
| Exhaust Air Temperature | °C | Read | |||
| Waste Air Temperature | °C | Read | |||
| Indoor Air Temperature | °C | Read | |||
| Current Supply Flow | m³/h | Read | |||
| Current Exhaust Flow | m³/h | Read | |||
| Required Supply Flow | m³/h | Read | |||
| Required Exhaust Flow | m³/h | Read | |||
| Required Fresh Air Flow | m³/h | Read | |||
| Current Fresh Air Flow | m³/h | Read | |||
| Fan M1 Signal | mV | Read | |||
| Fan M2 Signal | mV | Read | |||
| Heater Regulation | Read | ||||
| Heat Pump Control | Read | ||||
| Water Heater Pump | Read | ||||
| Water Heating Valve | Read | ||||
| Heat Pump Heating Signal | Read | ||||
| Heat Pump Cooling Signal | Read | ||||
| Required Performance Current | Read | ||||
| Desired Mode Current | Read | ||||
| Required Temperature Current | °C | Read | |||
| Required Zone Current | Read | ||||
| Current Season | Read | ||||
| Required Performance | Read and write | ||||
| Desired Mode | Read and write | ||||
| Required Temperature | °C | Read and write | |||
| Required Zone | Read and write | ||||
| Season Setting | Read and write | ||||
| Performance Control Source | Read and write | ||||
| Mode Control Source | Read and write | ||||
| Temperature Control Source | Read and write | ||||
| Zone Control Source | Read and write | ||||
| T-ODA Source | Read and write | ||||
| T-ODA From BMS | °C | Read and write | |||
| T-IDA Source | Read and write | ||||
| T-IDA From BMS | °C | Read and write | |||
| Mode Condition C10508 | Read | ||||
| Mode Condition C10509 | Read | ||||
| Fan Control Method | Read | ||||
| Unit Orientation | Read | ||||
| Heater Type | Read | ||||
| Cooler Type | Read | ||||
| Temperature Control Type | Read | ||||
| Circulation Damper Fitted | Read | ||||
| Clock Year | Read | ||||
| Clock Month | Read | ||||
| Clock Day | Read | ||||
| Clock Hour | Read | ||||
| Clock Minute | Read | ||||
| Clock Second | Read | ||||
| Unit Overheating | Read | ||||
| Unset Orientation | Read | ||||
| Heater Type Not Set | Read | ||||
| Frost Protection 2 | Read | ||||
| STP Contact Active | Read | ||||
| DP1 Pressure Gauge Failure | Read | ||||
| DP2 Pressure Gauge Failure | Read | ||||
| TU1 Sensor Failure | Read | ||||
| TU2 Sensor Failure | Read | ||||
| TEa Sensor Failure | Read | ||||
| TEb Sensor Failure | Read | ||||
| TA2 Sensor Failure | Read | ||||
| RD-IO Communication Failure | Read | ||||
| Unbalanced Flow | Read | ||||
| Frost Protection 1 | Read | ||||
| Interior Sensor Failure | Read | ||||
| Recuperator Frost | Read | ||||
| Recuperator Defrosting | Read | ||||
| High Tariff | Read | ||||
| Insufficient Flow | Read | ||||
| Insufficient Primary Heating | Read | ||||
| Clogged Filter | Read | ||||
| AI Input IN1 Failure | Read | ||||
| AI Input IN2 Failure | Read | ||||
| AI Input INk1/1 Failure | Read | ||||
| AI Input INk2/1 Failure | Read | ||||
| AI Input INk3/1 Failure | Read | ||||
| AI Input INk4/1 Failure | Read | ||||
| AI Input INk1/2 Failure | Read | ||||
| AI Input INk2/2 Failure | Read | ||||
| AI Input INk3/2 Failure | Read | ||||
| AI Input INk4/2 Failure | Read | ||||
| Unit Not Operational | Read | ||||
| Missing Configuration File | Read | ||||
| Insufficient Preheating | Read | ||||
| Unauthorised Heater Combination | Read | ||||
| DP3 Pressure Gauge Failure | Read | ||||
| External Pressure Gauge Failure | Read | ||||
| RD5-K/1 Module Failure | Read | ||||
| RD5-K/2 Module Failure | Read | ||||
| CH Defrosting | Read | ||||
| TRk1 Sensor Failure Module 1 | Read | ||||
| TRk2 Sensor Failure Module 1 | Read | ||||
| TRk3 Sensor Failure Module 1 | Read | ||||
| TRk4 Sensor Failure Module 1 | Read | ||||
| TRk5 Sensor Failure Module 1 | Read | ||||
| TRk1 Sensor Failure Module 2 | Read | ||||
| TRk2 Sensor Failure Module 2 | Read | ||||
| TRk3 Sensor Failure Module 2 | Read | ||||
| TRk4 Sensor Failure Module 2 | Read | ||||
| TRk5 Sensor Failure Module 2 | Read | ||||
| Update In Progress | Read | ||||
| Unauthorised Cooling Configuration | Read | ||||
| Safe Mode Active | Read | ||||
| Capillary Frost Protection | Read | ||||
| Frost Protection Configuration | Read | ||||
| Incomplete Learning Units | Read | ||||
| T-ODA Sensor Failure | Read | ||||
| T-ETA/T-IDA Sensor Failure | Read | ||||
| Cooling Not Available | Read | ||||
| Heating Not Available | Read | ||||
| Evaporation Active | Read | ||||
| Increased Performance During Flooding | Read | ||||
| Unauthorised Flow Settings | Read | ||||
| Filter Change Interval | Read | ||||
| Filter Test Configuration | Read |
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Use cases
- Show supply, outdoor and indoor air temperature of every ventilation unit on one dashboard.
- Send an email when the Clogged Filter warning or any alarm becomes active.
- Track supply and exhaust air flow over time to spot unbalanced ventilation.
- Lower the required performance of a school ventilation unit outside opening hours with a scheduled automation.
- Switch the desired mode or required temperature remotely without visiting the site.
Installation
Connect the Ethernet port of the RD5 control to the network of the ModbusCloud Gateway, or directly to its LAN port.
In the service settings of the unit, set 3.15.1 Modbus TCP to on. Modbus is off at the factory.
In ModbusCloud, add a Modbus TCP device with the IP address of the unit, port 502 and unit ID 1, and import the Atrea DUPLEX RD5 template.
Check that Outdoor Air Temperature and Supply Air Temperature show plausible values.
For control from ModbusCloud, set the control source registers to manual (0) so the weekly program does not overwrite your values.
Things to watch for
The unit does not answer on port 502. What should I check?
Modbus TCP is off at the factory; enable 3.15.1 Modbus TCP in the service settings. Check that the IP address of the unit is reachable from the network of the ModbusCloud Gateway and that no firewall blocks port 502. The unit answers on any unit ID except 0.
Some readings fail or come back late.
The RD5 control needs at least 5 seconds between batches of requests. Keep the reading interval at its default or longer, and avoid reading the unit from several systems at the same time.
Why does a written mode or temperature not stay?
If the unit follows its weekly program, the program overwrites manual values. Set the matching control source register to 0 (manual), or write 2 after the new value for a temporary change. Some modes also need equipment such as a circulation damper.
What should I watch out for when writing to the unit?
Write only the control values: performance, mode, temperature, zone and season. The configuration registers for fan control, orientation, heater and cooler must not be changed. Outdoor or indoor temperatures sent from another system must be refreshed within 90 seconds, otherwise the unit reports a sensor fault.
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