Climate Control | Mars Hydro 12L/Day Dehumidifier for Indoor Grow Tents | Smart RJ12 Control | iControl System Compatible

TThank you for your question.

When the dehumidifier is connected to the smart controller via the RJ12 cable, all four operating modes are still available in the app:

• Manual Mode
• Timer Mode
• Cycle Mode
• Environmental Mode

The main point that may cause confusion is that the "Level" setting (Low–High) does NOT control the fan speed.

Instead, the Level setting controls the dehumidification intensity, which determines how aggressively the unit removes moisture. Higher levels provide faster dehumidification, while lower levels provide gentler dehumidification.

Here's how each mode works:

Manual Mode
You can manually turn the dehumidifier ON or OFF whenever needed.
If you do not want the unit running continuously, this is the simplest option.
Timer Mode
You can schedule when the dehumidifier should start and stop.
This allows the unit to operate only during specific time periods.
Cycle Mode
You can create recurring operating schedules.
The dehumidifier will automatically run and stop according to the cycle you set.
Environmental Mode
First, set your desired humidity target on the main page.
Then enter Environmental Mode and select the desired Level (Low–High).
The selected Level determines how quickly the unit works to reach the target humidity.
Once the humidity reaches approximately 3% below the target value, the dehumidifier will stop.
When the humidity rises to approximately 3% above the target value, it will automatically start again.

For example:
If the target humidity is set to 60% RH:

The unit will stop at about 57% RH.
The unit will restart at about 63% RH.

If your goal is not dehumidification and you only want air circulation, you will need to disconnect the smart controller connection and switch the unit to Fan Mode directly from the dehumidifier's display panel. In Fan Mode, only the fan operates, providing ventilation without dehumidification.

We hope this helps clarify how the different modes work. Please let us know if you have any additional questions.

The dehumidifier has a maximum power consumption of 240W.

Regarding the air ducts: the lengths shown (22 cm and 30.5 cm) refer to the compressed (shortened) length. When fully extended, they are much longer:

One duct extends up to 150 cm
The other extends up to 200 cm

So what you see in the pictures reflects the ducts in their extended state, which is why they appear significantly longer than 22 cm or 30 cm.

Wenn in Ihrem Grow-Zelt bereits ein Belüftungssystem installiert ist, kann unser Luftentfeuchter entsprechend der vorletzten Abbildung auf dem Produktbild installiert und angeschlossen werden.

Diese Installationsmethode beeinträchtigt die normale Funktion des vorhandenen Belüftungssets nicht. Die Luft kann weiterhin ungehindert zirkulieren, während der Luftentfeuchter gleichzeitig zur Luftaufbereitung beiträgt und so für stabilere Umweltbedingungen sorgt.

Daher kann diese kombinierte Installationslösung bei korrekt funktionierendem Belüftungssystem bedenkenlos verwendet werden.

The sentence means that the dehumidifier can be upgraded to a fully smart control system by connecting it to an external controller such as the iControl Smart Controller or iHub-Pro. These devices allow for advanced features like remote control, scheduling, and integration with other grow equipment.

However, the unit can absolutely operate on its own without any add-ons.

In fact, the dehumidifier already includes a built-in humidity control mode (HOLD mode), which allows you to set a target humidity level (from 30% to 90%). The unit will automatically turn on and off to maintain the humidity within a small range (approximately ±3% of the set value).

Without the smart controller:

The unit can still automatically regulate humidity
It operates independently based on your manual settings
Humidity in the tent will remain relatively stable, with minor fluctuations

With the smart controller (optional):

You gain more precise and automated control
You can create schedules and advanced control strategies
The dehumidifier can work together with other devices (fans, lights, etc.)

In summary:
The dehumidifier works perfectly well on its own and can maintain stable humidity in your tent. The smart controller is an optional upgrade for users who want a more advanced, fully automated growing environment.

Yes, it is technically possible to run the unit without an air extractor by placing both the intake and outlet ducts inside the grow tent, so the system recirculates air within the space.

However, it is not recommended as a primary setup.

When both ducts are inside the tent, the unit will only be circulating and dehumidifying the same enclosed air. This means:

1. No fresh air exchange (CO₂ will not be replenished)
2. Heat will gradually build up inside the tent
3. Air circulation becomes less efficient in larger or dense canopy setups
4. Humidity may become uneven in different areas of the tent

The dehumidifier can still reduce moisture levels, but it will only be addressing part of the environmental control needs.

For best results, we strongly recommend using an air extractor (Ventilation system) to ensure continuous fresh air intake and proper heat/humidity balance. The dehumidifier should be used as a supplementary device, not a replacement for ventilation.