Mount the IntelliClimate controller in a position well away from water splashes or mist/vapour rising from the reservoir tank and preferably outside the grow room if you intend operating at high humidity, it should be mounted in a cool, dry place out of direct sunlight.

Remove the screws holding the back on and fit the mounting feet, then screw to the wall. If using the dry wall (plaster board) anchors use the longer screws supplied but if fixing to a ply back board use the shorter screws

The power supply to the IntelliClimate must be between 12V and 24V either AC OR DC. Normally a 24V DC supply is provided and in this case all of the outputs will also be 24V DC.Never connect a power supply exceeding 24V to the controller.

IntelliClimate Controller
(Front view)

(Imagine above needs fixing)

The low voltage power from the power adapter is connected to the two left connection on the left hand connector. Some power supplies have a white line or white print on the negative wire whilst with others the cable is a screened “co-axial” type.

In this case the screen should be connected to the “Common” and the centre wire to the 24V live (hot) connection on the controller.

Never connect a voltage supply greater than 24V to the controller.

Connection to Enviro sensors and optional outside temperature sensor

A single cable is run from the IntelliClimate to the first enviro sensor which then loops from the first enviro sensor on to the second sensor (if fitted) and on to the outside temperature sensor (if fitted). 

NOTE: There are two versions of enviro sensors:

  • Modern louvred “ES Intelli”: Identifiable by upward facing sensor, single green connector & RJ11 socket. These enviro sensors are are powered using the “Sensor Red” connection from the IntelliClimate and require three connections: +5V, ASL, GND
  • ES Ultra Intelli: Identifiable by downward facing Temp/RH sensor and dual green connectors. These devices are powered by the same 24V live/common as provided to the Intelliclimate.

This model cannot use RJ11 cables and require four connections:
Pwr+, Pwr-, ASL, GND

(Image above needs fixing)

The modern louvred enviro sensors can be fitted with an internal CO2 sensor or may use an external sensor (0..10V) if that is preferred (NOTE: Ultra edition can only use internal CO2 sensors).

The diagram above shows both methods.

Note that if a second enviro sensor is used it is not absolutely necessary for it to have a second CO2 sensor although one may be fitted if desired and the controller will then operate according to the average value from the two sensors.

The external CO2 sensors require a low voltage power supply – normally 24V but the internal sensors are powered directly over the normal 3/4-wire connection

The louvred type enviro sensor may be connected using the supplied plug-in wiring or can also be hard wired to the internal connector if that is desired.

To hardware to the enviro sensor and outside temp sensor, slide out the inner plastic box after rotating the holding tabs to provide a clear exit path.

ES Intelli “Modern-louvred” model

ES Intelli “Ultra” model

ES Intelli “Ultra” wiring at Controller

Setting the address of the enviro sensors

The first enviro sensor should have the rotary switch set to 1 with the second enviro sensor set to 2 and the outside temp sensor set to 0.

Light over-temperature sensor – CONNECT TO ENVIRO SENSOR 1

 These are useful where air cooled lights are used so that if the light cooling fan fails and the light fitting starts to overheat, the sensor contacts will open and the lights will be turned off and the alarm triggered.

Note that any thermostat type sensor can be used providing its contacts are normally closed (when cool) and open when over-temperature.

It is preferable to use the type that stay open once tripped and need to be manually reset. 

Note that the over-temperature switch can only be connected to enviro sensor 1.

Relay Boxes


To drive mains powered equipment, the 24V DC outputs must be connected to relays or contactors that have 24V DC coils. We normally supply twin relay boxes that provide a convenient method of achieving this.

Note that the total mains current draw from a relay box should not exceed the rating as printed on its label.  

Secure the Relay boxes to the wall. If using plaster board anchors, screw the anchors in firmly until they are flush with the wall. The anchors supplied are self drilling and so there is no need to pre-drill the wall.

Position them, give them a light tap to get started and then turn to drill/screw in with a Phillips or Pozi screw driver.

Use the longer metal screws to fix the valve plate to the nylon anchors or if fixing to a solid wood back board, use the shorter screws supplied.

A thin flexible cable is used to connect the relay box to the controller. The black wire is the common, the red is for the upper socket outlet and the white is for the lower socket outlet.

Example connection of a relay box to operate Light1 and Fan1

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