The diagram below shows how the actual fan speed changes when the user has set the fan to auto.
Example:
- current operational mode: Heating
- Δt1 = 1°C
- Δt2 = 1°C => 20% Δt2 = 0.2°C
- Δt3 = 1°C => 20% Δt3 = 0.2°C
- target temperature (w) = 23°C
- threshold temperature 1 (th1) = w-Δt1 = 23 - 1 = 22°C
- threshold temperature 2 (th2) = th1-Δt2 = 22 - 1 = 21°C
- threshold temperature 3 (th3) = th2-Δt3 = 21 - 1 = 20°C
- measured temperature = 22.2°C
When the measured temperature drops from 22.2 to 22°C (threshold temperature 1 - th1) or lower, the valve(s) fan goes into Low speed mode
The temperature keeps dropping to 21°C (threshold temperature 2 - th2), the fan goes into Medium speed mode
The temperature drops further to 20°C (threshold temperature 3 - th3), the fan goes into High speed mode
Temperature starts increasing till it reach 20.8°C (20%Δt3 threshold), where the fan speed is reduced to Medium.
Temperature increases further till it reach 21.8°C (20%Δt2 threshold), where the fan speed is further reduced to Low.
Temperature increases still, reaching 23°C (target temperature - w), the Fan turns off.
Delta temperature 1 (ΔT1)
You can change the delta temperature (ΔT1) with the following command set.
You can set the delta temperature (ΔT1) with the command:
XX - ΔT1[°C] * 10. Default value: 0x0A (1,0°C)
Example command: 0x6A0F;
0x0F[HEX] = 15[DEC] => ΔT1 = 15 / 10 = 1,5°C.
This command gets the target temperature step. The keepalive data in the example below is omitted for clarity.
ΔT1[°C] = XX / 10;
Example command: 0x6B;
Example response: 0x6B0F;
0x0F[HEX] = 15[DEC] => ΔT1 = 15 / 10 = 1,5°C.
The allowed ΔT1 range step is 0,5...10°C (0,5°C resolution).
Delta temperatures 2 (ΔT2) and 3 (ΔT3)
You can change the delta temperatures (ΔT2) and (ΔT3) with the following command set.
You can set the delta temperatures (ΔT2) and (ΔT3) with the command:
XX = ΔT2[°C] * 10. Default value: 0x0A (1,0°C)
XX = ΔT3[°C] * 10. Default value: 0x0A (1,0°C)
Example command: 0x6C0F14;
6C -> command code
0F[HEX] = 15[DEC] = 1.5°C *10 -> Set the ΔT2 = 1.5°C
14[HEX] = 20[DEC] = 2.5°C *10 -> Set the ΔT3= 2.5°C
This command gets the target temperature step. The keepalive data in the example below is omitted for clarity.
Example command: 0x6D;
Example response: 0x6D0F14;
ΔT[°C] = XX / 10;
0x0F[HEX] = 15[DEC] => ΔT2 = 15 / 10 = 1,5°C.
0x14[HEX] = 20[DEC] => ΔT3 = 20 / 10 = 2,0°C.
The allowed (ΔT2) and (ΔT3) range step is 0,5...10°C (0,5°C resolution).
