Vaillant VR33 (with Nest) and VR66

[Mcalm01]

I posted the message to let other folks know that they have new stocks.

I will be back for assistance in getting it to work on my EcoFit Pure 415 boiler with PDHW.

 

[Sam Thorn]

Just doing this today. Just checking nothing connects the boiler to the vr66?

Are the nests connected to it?

I’m a bit confused by this too. Is the nest connected to the open term only and the vr66 still controls hw and heating under command from nest as putting in the vr33 changes ebus to opentherm? Why is the vr66 still required if nest can modulate over opentherm? Any help appreciated

 

[asoffe]

I ordered it from cvonderdelenhartog.nl too. Sorry I've not seen the recent messages for some reason. The wiring is quite straightforward. This website has useful info on the installation, including pictures, of the VR33 (Vaillant gasketel moduleren opentherm VR33 printplaat - installatie? - https://www.dailybits.be/item/vaillant-gasketel-moduleren-met-opentherm-via-vr33-printplaatje/)

 

[Mcalm01]

Thank you for the info. I'll be in touch when I am ready to set it all up. I will be getting my old Potterton Supriema replaced with a Ecofit Pure 415 and my aim is to configure an identical setup like what you have managed to do with a VR10 NTC to keep the HW Cylinder topped up when the storage water temp drops below a set threshold. I have a single 3-port valve (s-plan) and just need to figure out which wires I need to connect to the VR66. If you have a pic as you know the saying goes. it will speak louder than words.

 

[bwel]

Has anybody managed to use the VR33 with Two zones i.e two Nests on OpenTherm ?

eg image below.
Nest 1 - Central Heading (CH) Ground Floor
Nest 2 - Central Heating (CH) Upper Floor AND Hot Water (HW)

If so, do you simply link the two Nests Opentherms (OT) together, like dives on a multiple master Bus ?
Certainly eBus connections can work like this, but I'm not sure about Nests and the VR33 Opentherm

Ideally, I would like to have

• Nest 1 with a lower Target Temp (50) and Lower kWh, that better suits Underfloor Central Heating.
• Nest 2 with a High Temp (75) for the HW Cylinder Charging and the Upper Floor Central Heating radiators.

If so, would you still need to use the Opentherm alongside the VR66/65 for Hot Water Priority ?

 

[ShaunCorbs]

You can’t have more than one opentherm device sorry

 

[Registered Gas Man]

Not strictly correct. You cannot have Mike opentherm zones with Nest. Nest is all flashsy but lacks substance...

EvoHome can handle multiple opentherm zones as can EPH controls.

 

[magician2905]

Do either of these help anyone?

How to install & wire Nest thermostat for dual / multi zone system with radiators and UFH​

How to install Nest thermostat (UK) on an S plan - system with hot water cylinder​

 

[Plum47]

Hi All, can anybody advise what is the correct set-up for SYSTEM Vaillant boilers?

Currently I have the boiler with a junction box for the valves and water cylinder and a classic room thermostat (Salus, On/Off type).

I have the vr33 module as well as a tado unit. Where do I go from there? Do I simply remove the old thermostat, plug the the vr33 on the PCB, and wire tado to the 2-pin connector of the vr33?

Or instead, does the vr33 need to be connected to the junction box somehow?

Thanks

 

[SamThor]

Hi All, can anybody advise what is the correct set-up for SYSTEM Vaillant boilers?

Currently I have the boiler with a junction box for the valves and water cylinder and a classic room thermostat (Salus, On/Off type).

I have the vr33 module as well as a tado unit. Where do I go from there? Do I simply remove the old thermostat, plug the the vr33 on the PCB, and wire tado to the 2-pin connector of the vr33?

Or instead, does the vr33 need to be connected to the junction box somehow?

Thanks

I’ve just completed this install . Run a new 2 core cable from boiler to nest heatlink. Install vr33 believe it connects into x32 port . Connect the new wire to vr33 and nest heatlink, remove old thermostat. Setup nest as open therm