Fan Settings

1. Changing the fan speed

If the fan speed is set to auto, the actual speed is determined by an algorithm explained here. It's also reported in the keepalive of the device.

1.1 Fan type: 3-speed fan

SET

You can set the fan speed with the command:

Byte index	Hex value – Meaning
0	44 – The command code.
1	00: Automatic. Default 01, 02: Low. 03, 04: Medium. 05, 06: High.

Example command: 0x4402 – Sets fan speed to Low.

GET

1.2 Fan type: ECM fan

You can change the fan speed with the following command set.

SET

You can set the fan speed with the command:

Byte index	Hex value – Meaning
0	44 – The command code.
1	00: Automatic. Default 01: Fan speed 1. 02: Fan speed 2. ... 06: Fan speed 6.

Example downlink: 0x4404 – Sets the fan speed 4.

GET

2. Limiting the selectable fan speed

This only reflects what's selectable through the device's buttons.

2.1. Fan type: 3-speed fan

You can change the fan speed limit with the following set of commands.

SET

You can set the fan speed limit with the command:

Byte index	Hex value – Meaning
0	46 – The command code.
1	00: Low / Medium / High. Default value. 01: Low / Medium. 02: Low. 03: Fan control deactivated.

Example downlink: 0x4601 – Sets the fan speed limit to Low / Medium.

GET

2.2 Fan type: ECM fan

Description pending

3. ECM Fan Settings

The following commands are for advanced users only.

Use with great caution.

3.1. ECM Fan min/max control voltage settings.

You can change the minimum and maximum voltage of the ECM fan with the following set of commands.

SET

The command adjusts the voltage range of the ECM fan.

Byte index	Hex value – Meaning
0	48 – The command code.
1	XX - Vmin[V] * 10. Default value: 0x1E (3V).
2	XX - Vmax[V] * 10. Default value: 0x64 (10V).

Example downlink: 0x481947;

Sets the Vmin = 2,5V => 2,5 * 10 = 25 convert to HEX 0x19.

Sets the Vmax = 7,1V => 7,1 * 10 = 71 convert to HEX 0x47.

GET

Adjustable range is 0…10V (0,1V resolution).

3.2. ECM Relay (F-ON)

This commands allow you to set/get the ECM relay (F-ON) - whether it's activated or deactivated at all.

SET

Set the ECM relay to activated/deactivated.

Byte index	Hex value – Meaning
0	4C – The command code.
1	00: Deactivated the ECM relay (F-ON); 01: Activated the ECM relay (F-ON). Default state.

Example downlink: 0x4C01 – Activated the ECM relay (F-ON).

GET

3.3. ECM start up time

The ECM fan starts at maximum speed for a specified start up time.

SET

Set up the start up time.

Byte index	Hex value – Meaning
0	4A – The command code.
1	XX - ECM start up time. Default value: 0x00 (The function is deactivated).

Example downlink: 0x4A03 - Sets the ECM start up time to 3 seconds.

GET

Acceptable values: 0...20 seconds (1sec. resolution).

3.4. Additional fan modes

These commands are available for devices with firmware version ≥ 1.6

SET

Set аdditional fan modes.

Byte index	Hex value – Meaning
0	7A – The command code.
1	00: Turn off the fan when the target temperature is reached. Default. 01: Keep the fan running for some time after reaching the target temp. 02: The fan runs continuously.

Example downlink: 0x7A02 - Sets the fan runs continuously.

GET

3.5. Fan off delay time

These commands are available for devices with firmware version ≥ 1.6

Continue running for X minutes on LOW speed fan to cool off the heating element.

SET

Set up the start up time.

Byte index	Hex value – Meaning
0	78 – The command code.
1	XX - Fan off delay time. Default value: 0x01 (1min).

Example downlink: 0x7803 - Sets the fan off delay time to 3 minutes.

GET

Acceptable values: 1...255 minutes (1min. resolution).