Heating Actuator Valve KNX, Loxone or ?

[Naran Khetani]

Hey All,

I was hoping someone could help me, my amateur experience and limited time I had in this lead me to this situation where I have wired CAT7 in a bus fashion to all my radiators, I was going to use KNX for this but my limited knowledge in this area let me down. So currently it seems I have 2 options:

1. KNX with Loxone:
Which would require the following Kit as an example:
- ABB SV / S30.160.1.1 Power supply standard, 160 mA, RE, 160 mA, KNX BUS PSU
- ABB VAA / S6.230.2.1 Valve Drive Actuator, 6-gang
- ABB 2CDG120050R0011 TSA / K 24.2 Thermoelectric actuator, 24 V
- ABB VA / Z10.1 Valve Adapter Item

Now the problem with the above is I can only have a Max of 4 Actuators because I have wired in a bus fashion I will need to use 1 pair twisted per actuator, this is just theoretical.

2. Loxone Tree
 - Loxone Valve Actuator Tree x5 

 - Tree Extension x1

The Loxone solution is the simplest and will work for my situation I believe correct me if I'm mistaken but its damn expensive, in comparison, the KNX solution is a lot cheaper *surprised*. Does anyone have an option 3 for me or is this as good as its going to get?

[Duncan]

i think you have misunderstood knx - its a bus system that requires a single pair of wires that goes to all devices, not a pair to each device

your options are knx or loxone tree still

you say 5 tree actuators - if you only have 5 zones or actuators you could use your cat7 cable to drive each one individually from loxone relay outputs if you use 24v normal actuators - an 8 core cat7 could have 3 cores together as a common 0v and 5 cores driving the actuators at 24v  which is probably the cheapest option.

[Naran Khetani]

Hi Duncan,

i think you have misunderstood knx - its a bus system that requires a single pair of wires that goes to all devices, not a pair to each device

that's how I have understood the KNX system but my initial silly understanding was that each actuator just connects to the BUS but I believe that's not the case and needs to connect to a KNX Actuator with relays.

BTW I absolutely forgot that I have 24v outputs on the miniserver excellent suggestion and i should have enough pairs to do it!!

I really do like the loxone solution using tree though, but budgets not approving that one!

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[Duncan]

yes i made the same mistake - i assumed that a knx actuator valve would connect to the bus, but the one you linked to appears to be a rebranded mohlenhoff alpha 5 one, the same as the loxone one.

[John Verdicchio]

I have underfloor heating and TRV controlled by loxone. The underfloor heating supplier , see https://www.underfloorheating.co.uk/profitherm-actuator-24-v-normally-closed-c2x24399646, supplies a variety of different 24V and 240V actuators. I control all the actuators via a 24V DMX controller via DMX extension. Also works for the LED lights.

[Naran Khetani]

That's great John, would you have more details on the DMX Device you used?

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[John Verdicchio]

brought on Amazon, look for "High Power 24 Channel RGB 3A/CH DMX512 Controller Led Decoder Dimmer". Have 2 installed , one for 12V and another for 24V.