eddiem74 wrote: » Interesting post above, same question for me. Will the drayton valve fit? Also when removing the old valve is there any servicing that should be done? I vaguely recall my plumber saying to check the pin the valve sits on, perhaps some WD40 and some pushing in/out with a plyers? I might be dreaming though...:o
John mac wrote: » my system is a simple one , power in and power out to fire the boiler . i have the two channel version , so what i need to know is what terminal do i use to send power to the boiler ? _______________________________ think i may have it / like this ? or do i wire it as the single channel
eddiem74 wrote: » Interesting post above, same question for me. Will the drayton valve fit?
John mac wrote: » Smashing thanks .
John mac wrote: » future proof , gona swap out the ball valve i have with a motorised valve in the summer , (although i have been saying that for 16 years ) ..
deezell wrote: » At least its just wiring, actual plumbing is done.
deezell wrote: » Yep. Straight swap. Change the basplates, terminals 1, 3 and 5 of the Horstmann to terminals 1, 3 and 2 of the Drayton
eddiem74 wrote: » So removed the existing programmer and this is what is there in terms of wiring. It looks like there are wires looping between the off positions if I am reading everything correctly. Does this look normal before I proceed further?
deezell wrote: » The supply Live to L appears to be looped to 2, 4, and 6, and from 6 out the back of the baseplate. Perhaps the installer thought these were COM terminals for the 3 relays, rather than as on the diagram where COM is internally wired in the unit from L, and 2,4 and 6 are NC terminals for each relay. It may be the case that a different unit was on the same baseplate previously, and had this requirement. Physical baseplates are semi standardised, but individual manufacturers use of the pins is not. What is clear is that there is no switching involved, as all 3 terminals are held live. So all you need to do is make sure that the brown wire from 6 that goes out the back of the plate is connected to Live on the Drayton plate, all the others have no function. So your wiring instructions are; Change the basplates, terminals 1, 3 and 5 of the Horstmann to terminals 1, 3 and 2 of the Drayton, and external wire to 6 on the Horstman to L on the Drayton. Live and Neutrals on the Horstman to the L and N on the Drayton, discard any loops.
deezell wrote: » Looking at this closer, there are two brown wires from the HW ON terminal 5 on the Horstman. If your system is a three zone valve S plan system, there would be no requirement for anything other than a single live to each zone valve, the zone valves' relays in combination firing the boiler and powering the circulation pump. There is a possibility that your system is wired without valve relays implemented, there's been a rash of these in recent posts. In such a system a single timer or a HW zone operating in gravity mode fires the boiler for all zone events. I'll take a look and see if your Horstman has a gravity mode switch and get back to you.
eddiem74 wrote: » I wired per your suggestion above and ran the App set-up. Upon completion Hot Water was all that was visible in the App. I then proceeded to swap out all the radiator values with the Drayton ones. 3 radiators had those little pinheads that would not move even after WD40 so still installed the new values for the moment. At this point I had done nothing else and had not installed the 2 room stats I had gotten, was unsure with the radiator values if they were needed or not? Per the default app schedule at 4PM it was to set rooms to 20degrees and i could see from the stats some rooms were at 17degrees. So I just waited and at 4PM the boiler kicked in and I can see on the App any rooms that are below 20degrees have a fire symbol. I set hot water to off as typically when I run the heating / radiators in the winter the hot water heats as a result so I do not need to have hot water on, per the old wiring/timer. I assume still the same or?
deezell wrote: » The CH1 and CH2 outputs are paired to the wall stats, but also to the TRVs. Any TRVs you pair to an output will open the corresponding valve, so don't pair a TRV on an upstairs rad with the downstairs CH1 output. Unless you have a full TRV setup in a zone, other rads in the zone will only heat when a TRV calls the zone. Pairing the wall stat and locating it in a general area, hall/living downstairs, landing upstairs, will allow general control and accurate temperature for the zone, while TRVs in the zone will fine tune their rooms, or turn them off when not needed, e.g., spare bedrooms, or living room in the afternoon. Reading ahead to your next post you say you have zone independence, but in this post you say HW always heats when any CH zone is on. This sounds like a gravity system, or the Horstman was switched to gravity mode. I checked, there is a switch or jumper at the back of the unit. See if it was set to gravity or pumped.
deezell wrote: » Sounds like it set up as full S plan, though Im curious about HW heating when only a ch zone is active. If all three zones have valves, will be independent, if HW has no valve or it's valve is latched/stuck open, HW will heat for any event. You've a bit of testing to do, it should operate exactly like the Horstman, but with the addition of the TRV zones.
salnado wrote: » Hi, I am looking for some Tado advise, apologies if it is already covered above. I have a Vitodens 100W WB1W boiler, an upstairs circuit and a downstairs circuit both with wired thermostats, and a hot water circuit with a strap-on cylinder stat. These are all wired, via a wiring centre to an EPH T37-HW controller as in the attached drawing. The thermostats are poor and the downstairs one is badly located so I purchased the Tado wireless smart thermostat starter kit and an extra smart wired thermostat on Black Friday. They arrived last week, but on starting the install Tado's app says they don't support the EPH T37 HW. Initial response from Tado's support is "Unfortunately, we are not compatible with a three channel programmer, so you can not replace that device with our Extension Kit" and advised me to return the wireless stat and put in two wired stats and use the existing controller set to constant for the heating circuits. This is not ideal due to the location of the wiring for the downstairs stat. From what I had read here, I thought that I could install the wireless thermostat for the downstairs circuit and the wired one for upstairs and was prepared to pull apart and rewire from the wiring centre if necessary. Can anyone tell me if Tado's response is my only option or if I can wire it up the way I want it. Thanks in advance
JohnDeereIE wrote: » Sorry if this is stupid question. I have a system with two thermostats. One for heating and one for water. Both are wired and I want to swap with Tado. Went to a supplier and he wants 120 euro just to drive 10 mins over the road to look and says it will probably cost circa 1200 euro which is crazy. I was going to buy the equipment myself and a mate who is electrician said he would install. Am I correct this is the kit I need to buy? Tado Wired Heating Starter Kit Water Starter kit I can only seem to find the Water starter kit with the wireless but at the moment I have a wired existing thermostat. Or am I talking gibberish.
deezell wrote: » your existing wiring circuit is too vague to draw any real conclusions from, but if the controller is a standard 3 zone EPH, it should be possible to simply substitute the Tado as you suggest, with the ext kit replacing the outputs of HW and CH1, and a wired back connnection from the other Tado stat to trigger CH2. Try to establish if all zones are independent, with each operating only its own motorised valve. The boiler model you listed is proving difficult to find an installation wiring diagram for, but I assume it is fired by the combination of all three valve relays, possibly volt free. I note an orange and grey wire to what must be the boiler call terminals. I have only found this boiler model on US sites, installation in the US can be strange, volt free for firing, and odd connections for external valves, but I'd take it yours is a straight 2 pipe connection with s plan valves to the 3 zones, HW in a cylinder, not direct from the boiler. Also, the model of the EPH is T37 or R37? the HW designated models can have a gravity mode switch, using the HW output to fire the boiler for all events. Again the presence of three valves should indicate proper s plan wiring, hence the need to check for zone independence. A photo of the EPH backing plate wiring would be useful also. Its not clear from your diagram at what stage the zone thermostats are wired in series with the EPH live calls to the zone valves, but it should not make any difference, if you merely substitute the ext kit for the EPH, wiring CH 1 and HW in place of the first 2 EPH zones, then wiring EPH CH 2 to permanent live and replacing it's wired stat with the Tado. Also turn the old CH1 stat up full or else remove and cross its connections.
deezell wrote: » You need the Tado starter kit with HW. This has a relay box known as the extension kit for timing of HW, but you still retain your wired hw stat. It also has a relay for wireless operation of the Tado stat, but the stat can also be wired in place of the old stat, with the ext kit only used for hw timing. You say you current system is two stats. Is there a timer also? can you heat HW only and CH only, or does HW heat when you have CH on? €1200 is mad alright. It might be easier to leave the HW alone, on its own stat (is this on the side of a HW cylinder?), and just get the wired Tado stat kit and replace the ch stat, a DIY job.
salnado wrote: » Thanks Deezel. Attached is a better diagram with more detail including the EPH (which is a T37 - HW). Also, I found an installation manual for the boiler at this link Based on this further information, I think the existing setup is wired according to an S-plan setup. I will wait on Tado to come back to confirm what I should connect where on the Wireless Receiver.
JohnDeereIE wrote: » Thank you I think the 1200 included the kit plus a number of rad thermostats so might not be too bad. At the moment it has two thermostats which are connected to an old controller. It turns on/off heating and water. You can turn on one without the other if you know what I mean. I was going to get the "tado° Wired Smart Thermostat Starter Kit V3+ - Intelligent heating control, easy DIY installation" but I don't see this starter kit with the hot ware controller. Or do I need to buy the "tado° Wireless Smart Thermostat Starter Kit V3+ with Hot Water Control " Do I get the Wired kit and then buy the hot water separate? Thanks again(Sorry can't post link)
deezell wrote: » T37 is identical to R37. 3 switched live out , HW, CH1, CH2 on terminals 3, 5 and 7.The new version of the Tado ext kit has the following terminals Using CH1 stat wirelessly; Connect a loop from live L to Tado CH COM and HW COM.
deezell wrote: » Move connections from EPH 3 to Tado HW NO. Move EPH 5 to Tado CH NO Connect EPH 7 to the input Live L.
deezell wrote: » Install the first Tado stat wirelessly back to the ext kit. Turn the old CH1 stat up full. You should now be able to control CH1 and HW timing from the Tado. Ch2 will now be permanently on but still controlled by the old CH2 thermostat. Remove this stat and replace with the second Tado stat hard wired in place.
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