AURATON Hydrus

User manual ver. 20210413
This document collects information on the safety, installation and use of the AURATON Hydrus device.

Device description

Dual-function central heating (CH) or domestic hot water (DHW) pump controller

Application as a central heating pump controller

AURATON Hydrus can be used to automatically turn a circulation pump on and off depending on temperature. The controller-pump assembly forces water circulation in central heating systems. The AURATON Hydrus sensor measures the temperature of the water in the central heating system's supply. In solid fuel central heating systems, AURATON Hydrus will turn off the circulation pump once the boiler flame has extinguished.

Pumping water with the flame extinguished is not recommended - the air draft into the chimney causes the water in the boiler to cool faster than in the radiators.

The optimal temperature can be set on the AURATON Hydrus display (usually 40°C).

In a central heating system with a gas boiler, the temperature set on the AURATON Hydrus must be lower than the temperature set on the central heating boiler. Setting the AURATON Hydrus to a temperature above the dew point prevents the boiler from sweating while heating the water in the central heating system.

The setting range for the central heating pump is from 20°C to 90°C.

The hysteresis (the difference between the switch-on and switch-off temperatures) can be set between 2 and 8 °C.

Application as a DHW pump controller

AURATON Hydrus can also be used to automatically turn the circulation pump on and off depending on the temperature.

In domestic hot water (DHW) systems, the controller-pump assembly forces water circulation in DHW systems with a heating device without a pump control system. The AURATON Hydrus sensor measures the water temperature in the DHW tank.

The setting range for the DHW pump is from 20°C to 90°C.

The hysteresis (the difference between the switch-on and switch-off temperatures) can be set between 2 and 8 °C.

Installation

Sensor mounting:

Operation in CO mode

  • Install the sensor on the exposed outlet pipe from the central heating boiler (as close to the boiler as possible).
  • Press the sensor against the pipe with a clamp.
  • It is advisable to wrap the outlet pipe from the boiler to the sensor with insulating material.
  • If solid fuel and gas heating devices operate on a common central heating system, the sensor should be mounted at the point where both outputs connect and insulated.

Operation in DHW mode

  • Install the sensor in the DHW tank
    NOTE:
    Do not immerse the sensor in liquids and do not install it on the exhaust outlets to the chimney.

Connecting the power cable to the pump:

  • Connect the yellow or yellow-green wire to the terminal ( $
  • Connect the blue wire (neutral wire) to the ( N
  • Connect the brown wire (phase wire) to the ( L

Connecting AURATON Hydrus:

After securing the wires against accidental breakage, connect the power cord to a 230 V AC mains socket.

AURATON Hydrus mount:

  • Mount AURATON Hydrus on a wall or bracket using two screws (wall plugs included).
  • Attach the cables from AURATON Hydrus to the wall.

Description of AURATON Hydrus

  1. LED display
  2. operation lights
  3. function button / power switch
  4. function button / operating mode
  5. temperature sensor
  6. pump control output
  7. power cord

First start-up

On the left side, below the display, is the power button ( ® ). Holding it for 2 seconds turns the AURATON Hydrus on or off. When the AURATON Hydrus is off, the LED lights red, and when the AURATON Hydrus is on, the LED lights green.

Once switched on, the display will show the following information:

  1. Display test (all segments lit).
  2. Software version (e.g. 1.2)
  3. AURATON Hydrus
    © – central heating pump
    , – hot water pump
  4. current sensor temperature.

AURATON Hydrus is ready to set the appropriate operating temperature.

Temperature setting

Briefly pressing the left or right button activates the temperature setting function.
The temperature on the display will flash for 5 seconds. During this time, use the ( – ) or ( + ) buttons to set the appropriate temperature.
After selecting AURATON Hydrus, it will automatically save this value, and the display will show the current sensor temperature.

Setting the AURATON Hydrus operating mode

The AURATON Hydrus can be set to one of two operating modes.
To check which mode the AURATON Hydrus is operating in, simply hold both the ( – ) and ( + ) buttons for 2 seconds. The display will show:
© – controller in operation mode with the central heating pump
, – controller in operation mode with the domestic hot water pump.

– ) and ( + buttons simultaneously for 5 seconds. After this time, the display will show a flashing © or , . While this information is displayed, you can use the ( – ) or ( + ) buttons to change the set mode.
The change will be automatically saved.

Hysteresis setting

– ) and ( + simultaneously for 5 seconds.
After 5 seconds, the display will show the flashing AURATON Hydrus operating mode ( © or , H4 ) will be visible for another 5 seconds

While this information is displayed, you can use the ( – ) or ( + ) buttons to change the value. The controller allows you to set the hysteresis within a range of 2° to 8°C ( H2 to H8 ). Once you make a change, it will be automatically saved.

Example:
When setting e.g. H4 in © and an example temperature of 40°C, the pump will turn on when the temperature exceeds 42°C and will turn off when it drops to 38°C. However, with H4 , mode and an example temperature of 40°C, the pump will turn off when it exceeds 42°C and will turn on when it drops to 38°C.

Disabling the pump alarm

software version from 1.2

In specific situations, it is possible to disable the E1 pump disconnected or faulty alarm. This may be necessary when connecting a low-power pump or an electronically controlled pump.

To do this, enter the AURATON Hydrus menu:
Change the settings by simultaneously holding both buttons ( – ) and ( + ) for 15 seconds.
After 5 seconds, the display will show the flashing AURATON Hydrus operating mode ( © or , ), and then the set hysteresis value (e.g. H4 ) will be visible for another 5 seconds.

The next setting concerns turning off the E1 , the display will show a flashing A1 (factory setting), which means the alarm is on.

While this information is displayed, the ( – ) or ( + ) buttons can be used to change this value to A0, which means that the pump alarm ( E1 ) is disabled.

Manually turning on and off the central heating or domestic hot water pump

AURATON Hydrus allows you to manually turn on and off the central heating or domestic hot water pump

To do this, hold down the right button ( + ) for 2 seconds. Activation of this function is indicated by the right indicator light turning red and the ¨ .

The pump operates continuously, regardless of the temperature set on the AURATON Hydrus and the actual temperature at the sensor's location.
To turn the pump off, press and hold the right button ( + ) again for 2 seconds.

NOTE:
In operation mode , the pump will be on until it reaches 90°C. Once this value is exceeded, the pump will turn off. Once the temperature drops below 90°C, the pump will be turned on again.

Pump operation indication

Automatic pump operationThe activation of the pump is signalled by the flashing green light
Manual pump operationThe activation of the pump is signalled by the flashing of the right indicator light in red.

Error information codes

«Pump disconnected or damagedDisconnect the output power supply, wait for the fault to be removed, press any button after the fault has been removed.
°No network synchronization signal to protect the relayPump stops, waiting for momentary power disconnection.
±The sensor has shorted outCO mode – pump on.
CU mode – pump off, waiting for the fault to be repaired (sensor replacement). After the fault has been repaired, press any
button.
¬No sensor, sensor damagedCO mode – pump on.
CU mode – pump off, waiting for the fault to be repaired (sensor replacement). After the fault has been repaired, press any
button.
§Sensor temperature below 2°CStopping the pump, waiting for the fault to be removed (temperature increase).
¦Sensor temperature above 90°CWarning of excessive temperature.
CH mode – pump on.
CU mode – pump off.
NOTE:
The occurrence of the above alarms is signaled by an intermittent audible signal until the fault is repaired or the AURATON Hydrus is turned off. Once the fault is repaired, the controller resumes normal operation.
NOTE:
To turn off AURATON Hydrus during an alarm, hold both the ( – ) and ( + ) buttons for 2 seconds.

Other information codes

©AURATON Hydrus works in CO mode
,AURATON Hydrus works in DHW mode
¨The pump was turned on in manual mode

GUARD function

AURATON Hydrus is equipped with a GUARD that prevents the pump impeller from seizing when not in use. If the pump is not used for an extended period, the built-in processor automatically activates the pump for 30 seconds every 14 days.

NOTE:
To ensure the system continues to function after a long period of non-use, AURATON Hydrus should be left turned on.

Shutting down AURATON Hydrus

To turn off AURATON Hydrus, hold down the ( ® ) button for 2 seconds. The display will turn off and the LED will change from green to red.

Connection diagram

AURATON Hydrus connection diagram in CO mode

(cooperation with central heating pump)

  1. pump
  2. temperature sensor
  3. central heating furnace
  4. brown wire
  5. yellow-green wire
  6. blue wire

AURATON Hydrus connection diagram in CU mode

(cooperation with DHW pump)

Connection diagram with DHW tank:

  1. pump
  2. temperature sensor
  3. domestic hot water tank
  4. central heating furnace

Cleaning and maintenance

  • Clean the exterior of the device with a dry cloth. Do not use solvents (such as benzene, thinner, or alcohol).
  • Do not touch the device with wet hands. This may result in electric shock or serious damage to the device.
  • Do not expose the device to excessive smoke or dust.
  • Do not touch the screen with a sharp object.
  • Avoid contact of the device with liquids or moisture.

Technical data

Power supply:230V AC, 50Hz, 1.5W
Operating temperature range:0 – 40°C
Operating status indication:LED display, sound
Temperature control range:20 – 90°C
Temperature measurement range:2 – 99°C
Hysteresis:2 – 8°C
Relay load capacity:Max. 250 V AC, max. 1 A
Degree of protection:IP20
Dimensions [mm]:69.5 x 139.5 x 39

Disposal of the device

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Devices are marked with a crossed-out waste bin symbol. In accordance with European Directive 2012/19/EU and the Waste Electrical and Electronic Equipment Act, this marking indicates that this equipment, after its useful life, must not be disposed of with other household waste.
Users are obligated to dispose of it at a collection point for used electrical and electronic equipment.

Manufacturer's address and contact details:
LARS, ul. Świerkowa 14
64-320 Niepruszewo
www.auraton.pl

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