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You can’t have more than one opentherm device sorry
Discuss Vaillant VR33 (with Nest) and VR66 in the Central Heating Forum area at PlumbersForums.net
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 thermHi 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
Hi All, can anybody advise what is the correct set-up for SYSTEM Vaillant boilers?
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
This is an excellent question. How do you get Nest and VR33 to work together on a SYSTEM boiler, WITHOUT a VR65/VR66. Everyone else on this thread seems to describe how they use both VR33 and VR65 /VR66 Control Centre.
Here is my experience having done exactly as SamThor describes (and also bridged the RT24 and disconnected the RT240 live):
The CH is working with fine with modulation, but the boiler is not firing when there is DHW demand from the thermostat, neither is it applying the DHW temperature when both are running. My CW and DHW valves are still being controlled by the Nest thermostat and the DHW boost/charge signal is being sent via OpenTherm (D025 shows “Ext eBus signal: Cylinder charging: On” when there is hot water demand via Nest and off when there is no demand). However, the boiler refuses to fire up, presumably because it is not connected to VR65/VR66 to know the actual status of the valve/cylinder thermostat?
Has anyone managed to install VR33 and an Opentherm thermostat on a system boiler without a Vaillant Control Center? Thanks
Hi, sorry to jump in. Do you mean the 24V RT connection bridge?If you change from switch 230v to ot you need to put the link back into the 24v connection on the main board too
Hi, Do I need any of this if I am using Valliant ecotec pro combi boiler with VR33 OpenTherm and Nest ?I was able to get the Opentherm, Nest and DHW priority to work once I also installed the VR66, which effectively eliminated the S plan system. The wiring in logic is exactly as you say above Plum47.
I have written about all the steps here in a clean thread (I can't link, you have to search for it)
Vaillant Ecotec system boiler with VR66 and Opentherm (Nest)
Hi DawHi, sorry to jump in. Do you mean the 24V RT connection bridge?
I am also thinking to connect Vr33 openTherm module to my Vailliant ecotec pro24 to work with Nest gen3.
Hi, Do I need any of this if I am using Valliant ecotec pro combi boiler with VR33 OpenTherm and Nest ?
I'm setting up the VR66 and have installed the VR33.
Please can someone confirm how to wire 2 Nest stats for the 2 zone system I have. Do I put the VR33 OT wires to both NEST boxes?
Is two zone control possible with this setup. It's currently S plan with Unvented cylinder.
What version of VR66 did you use, there's VR66\2 which is most recent which they say has updated software.
Ah shucks. It means Ill have to do a standard S Plan, system boiler 2 Zone NEST setup.You can’t wire two nests in opentherm only one stat in the system
Ok, I’ll look into that as well. Thank you.You could do weather comp and run the nests as stnd on off controls
I Have the VR33 available. I have DM's you.So now I have a VR66, VR33 and VR10 NTC to off load as it’s no use to me.
Did you still want to sell these? I need to buy some. Thanks
Great helpful thread
Reply to Vaillant VR33 (with Nest) and VR66 in the Central Heating Forum area at PlumbersForums.net
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