MIN/MAX Valve openness

Limit MIN/MAX Valve Openness

This feature is available for firmware >= 4.3

This command allows you to decide what's the minimum and maximum valve openness for Vicki in percentages. It's only applicable when using the internal algorithm for temperature control. For example, you can decide that you want Vicki to control the valve only between 20% and 60% valve openness.

• If Vicki has to heat the room, it'll first open the valve to the MIN value you have specified.

• Vicki will not open more than the MAX value you have specified, which is particularly useful for hydronic balancing.

There is an exception to the set limits. In normal conditions if the internal algorithm calculates that it needs to go beyond the MIN or MAX openness it will be limited to the value set.

However, if the internal algorithm calculates it needs to completely close the valve it will ignore the MIN limit and completely close the valve (0% openness), no mater what the MIN limit was.

By default Vicki controls the valve openness from 10% to 100%

You can change these values in the range 0-100 via the command below.

Not allowed to set values that result in Min - Max < 10%.

SET

Byte index	Hex value - Meaning
0	4F – The command code.
1	XX - 100-Maximum valve openness in %. Default: 0x00 -> 100%
2	YY - 100-Minimum valve openness in %. Default value for f.w. < 4.6: 0x64 -> 0% Default value for f.w. ≥ 4.6: 0x5A -> 10%

You have to deduct the desired value from 100!

Meaning, if you want to set the range between min 20% and max 60%, you have to compose the command as follows:

1) MAX: 100 - 60 = 40 -> 0x28

2) MIN: 100 - 20 = 80 -> 0x50

Full command would be 0x4F2850 Another example - min 15%, max 90%

1) MAX: 100 - 90 = 10 -> 0x0A 2) MIN: 100 - 15 = 85 -> 0x55

Full command would be 0x4F0A55

GET