Environmental Controllers









Controller Overview
Vents
Up to 6 vents can be controlled in one zone; two ridge vents, two side vents and two end vents.
Vents can be controlled by any combination of the following :-
- Inside air temperature
- Outside air temperature
- Wind speed and direction
- Raining
- Humidity
- Inside humidity.
Screens
- Heron environmental controllers operate either separate thermal and shading screens or one combined screen.
- Thermal screens can be controlled by time, light, and inside and outside air temperature.
- Thermal screens have a delayed opening feature to allow gradual air circulation.
- Shading screens can be controlled by time or light.
- Two gap positions can be specified for high inside temperatures.
Hot Water Heating
- Heron controllers operate a hot water motorised valve and a local circulating pump.
- Hot water heating controls air temperature or minimum and maximum pipe temperature.
- Hot water heating can be immediately shut off if a specified high vent position is reached.
- Glasshouse humidity can be reduced by maintaining a minimum pipe temperature.
On-Off Heating
- Heron environmental controllers operate two heaters; a main and a back up heater.
- Heating can be initiated by a low inside air temperature threshold or by a falling temperature gradient.
- Heating can be disabled with a specified high vent position.
- The Back-up heater can be set to start at a lower temperature threshold.
Fans
- Heron environmental controllers can operate two cooling fans and one circulating fan.
- Circulating fans can be controlled by time or humidity.
- Circulating fans can be disabled with high vent position.
- The first cooling fan is started when a high inside air temperature threshold is reached.
- The second cooling fan can be started if a higher inside temperature threshold is reached.
Periods
- Up to four control periods can be specified to allow for different settings throughout the day.
- Time periods can be set using “time of day” or astronomic time.
Full Range of Sensors
Heron environmental controllers can be integrated with our full range of sensors.
- Outside air temperature
- Aspirated inside temperature
- Pipe temperature
- Wind Speed
- Wind Direction
- Raining
- Light
- Humidity





Hardware Specification
Outputs
- All outputs are general purpose.
- Outputs are configured at installation to perform the required control function, e.g. heater output, vent output.
- Vents, screens and motorised valves require two outputs, open and close.
- One alarm output is available for each zone. The alarm output is activated on high temperature, low temperature, sensor fault, zone fault.
- All outputs are 24V AC (to operate 24V AC relays).
- The total output current is 1.0 Amp per module.
- All outputs are protected with electronic overload cut-out.
- Output current is measured for diagnostic display purposes.
- All outputs are protected against electrical surges exceeding ANSI C62surge suppression standards.
- Designed to operate in an industrial environment. High electrical noise immunity, can withstand a 2.5KV spike.
Inputs - Base Module
- Digital input for inside temperature and/or humidity.
- Digital input for pipe temperature or boiler alarm.
- Digital input for Heron Weather Station.
- One data connector to connect PC and GSM mobile phone module.
Inputs - Remote Zone Module
- Digital input for inside temperature and/or humidity.
- Digital input for pipe temperature or boiler alarm.
Sensors
- All sensors connect via “Heron digital link”.
- Digital link does not require special cable. Use standard 4 core cable.
- Sensors can be connected up to 200m from the base module.
- Inside temperature sensor range 0 - 50
- Wind speed 0 - 70mph (+/- 5mph).
- Light sensor range 0 - 2000W/m