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.

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

Inputs - Remote Zone Module

Sensors

Heron - Environmental Controllers

Product Details