EPH CombiPack 4 - How To Wire - OpenTherm

#EPH EPH Controls How To Wire. Viva Training Academy shows us how to wire an EPH Combi Pack 4 on open therm
• EPH COMBIPACK 4 HOW TO...
Smart Thermostat. Boiler Plus Programmable Room Thermostat.

[@AllenHart999]

kzbin.info/www/bejne/np6kn5mMerp4a9U

[@timkingcarstuff1170]

Hi on my old thermostat it has 2 wires from the boiler. On the new Programmable has batteries but also has a com .so do I run a live wire to com and the link wires from boiler to the over connection points? ESI ESRTP4 Wired Programmable Room Thermostat

[@michaelshaw3580]

Thanks Alan, Ive been following you for a long time, Im a retired heating engineer but still like to keep up with whats going on. You are very informative, and explain in great detail. Mick, Thanks again

[@mcginn002]

Great to see Roy back excellent

[@julianhawker7672]

If your doing more EPH videos with Roy, It would be interesting to see a Y/S plan on a system/heat only boiler and how opentherm can be incorporated for control. Cheers. :-)

[@AllenHart999]

That’s a really good idea. I will send this suggestion to roy. Thanks.

[@julianhawker7672]

@@AllenHart999 I have only done it with Vaillant and their own brand kit Allen. Would be great to see what a manufacturer of generic controls recommends and procedure to fit.

[@johnburns4017]

@@julianhawker7672 My suggestion is avoid S plan. It is so outdated 70/80s. Viessmann have the 4 pipe boiler - two pipes are F&R for CH and two for F&R for DHW. The wiring of it is two wire to the room stat and cylinder stat, back to the boiler terminals, almost DIY. A doddle, for installers. Also, use a combi (a 4 pipe, but two fresh water) to heat up a cylinder using the cold inlet and DHW outlet to a cheaper direct cylinder using a brass pump, cylinder stat and simple single channel timer. The cyl' stat switch the brass pump. The brass pump gives flow thru the boiler which activated the internal flow switch. Simple. Use a Surrey flange on the cylinder's DHW outlet at the top to ensure hot water from the combi enters the very top. The pipes can be 15mm between the combi and the direct cylinder. Why buy expensive and troublesome direct cylinders and motorised valves, when the combi innards does it all for you. The system will be DHW priority for sure. Ring Vaillant they will say it is fine to do that. I think also Intergas approve as well, as do others. So obvious and cheap but few know of it.

[@julianhawker7672]

@@johnburns4017 Your first point is valid ( if you like Viessmann) ;-) Your second point (Which I have seen) isn't , we are discussing FULL opentherm, which the combi won't give you on the DHW system you describe. I looked at a job yesterday that needs 2 different heating zones and a DHW zone (310 ltr mains cylinder) 3 zones total. Kind of tricky without your 1980's S plan plus! Vaillants wiring center is a good off the peg answer, that uses opentherm and there controllers ............... but I am interested in what EPH have to offer as a generic control manufacturer and how Roy would approach install.

[@johnburns4017]

@@julianhawker7672 The second point was valid, in that it works, and it does not use an S plan. It does not need OpenTherm for the DHW. IT simple and cheap, and highly effective. You are on about CH zoning. Using then DHW section of a combi to heat a cylinder, you can still zone up the CH. OpenTherm can only use one OpenTherm device. OpenTherm devices are general, made by many manufacturers, not proprietary. It is an old protocol which needs updating - newish in the UK but old on the Continent. I believe it is moving over to using two devices. Some makers have got around this by frigging the circuitry. The Intergas Xtreme can have an OpenTherm room stat and outside temp sensor. When both are connected the weather compensation slope is disconnected. When only the outside sensor is connected the control system acts as normal weather compensation. The sensor is then used to just sense the outside temp, using that in assisting the room stat to modulate the burner in an algorithm they have developed themselves. Vaillant *do not* use OpenTherm, they use a proprietary protocol called ebus. They used their own because of the initial limitations of OpentTherm, and to keep customers locked into their controls. Allen did a vid of EPH doing multi zones using OpenTherm. Look it up.

[@timjay69]

Absolutely brilliant 😄

[@antonybuckley2645]

Great video thank you allen and Roy

[@myrasmith7611]

Need to know how to work the ariston boiler progrmer box

[@SPECTRUM580]

Great video Alen I have system viessmann w-100 boiler I am thinking of making the system better by either open therm or a weather temperature compensation sensor fitted on my north facing wall, what's your thought on this as my boiler is just over five years old and serviced every year.

[@jorkirasalas2726]

It would be a good idea to extend this with another video showing the EPH Wireless Programmable Cylinder Thermostat (CP4-HW-OT) operating with the CP4i Smart Thermostat which I think would allow *full* OpenTherm control of both hot water as well as space heating for system and heat only boilers.

[@AllenHart999]

kzbin.info/www/bejne/np6kn5mMerp4a9U

[@kennydonnelly35]

Fantastic video

[@kevinleesmith]

1) Does a modulating boiler only modulate down the burner, or does it also modulate the rad pump flow rate? 2) is the modulation power (kw) set by the opentherm stat or is the flow temp set by an opentherm stat and then the boiler chooses the appropriate kW? 3) if I use a weather compensating control like a google nest, does that automatically set the boiler output or does it set the flow temperature?

[@puddle_puddle]

I really wish this got an answer.

[@kevinleesmith]

@@puddle_puddle so do I!

[@mgbroadsterJ]

Can you have open therm and weather comp working at the same time ?

[@LINDADARCH-q7b]

Hi Allen. Thanks so much for all the help on your video, I have struggled with this for months and you have answered a lot of questions. However, can you tell me how I can put in a different programme for different days. (I’m out a few days a week). For example, on monday I would like different temperatures at different times as I’m out most of the day. I can’t seem to do each day separately. Maybe this is not possible. Do you know? Thanks. L

[@hammy9695]

Does a Baxi Assure 30 Combi boiler support or come with opentherm?

[@Koala260]

Hi Allen, I’m looking into anew wireless therm for my Baxi 830. It’s not the latest combo 2 but the previous one Being only just over a year old. I’m looking at either nest, baxi USense or the eph shown in this video but with the smart phone app. Which would I suggest please I’m not too bothered about pay back time more interested in boiler modulation to get nest possible efficiency Thanks for e reading

[@DintClempsey]

I’m replacing a relay controller with an OpenTherm capable one. I assume I just need to follow this guide, except swab the bridge from the OpenTherm terminals to the RT terminals on the boiler wiring block yeah?

[@anthonyschofield7807]

Hi Alan I really enjoyed your video where you replaced your own boiler and I noticed you used Nest controllers as it was S plan.If you had only a single zone and gone for opentherm would you still have used Nest or gone for Usense? Many thanks

[@incognitas]

Hi. What happens if you DON'T remove the little link (a little brown cable)? Will it cause the 3A fuse to blow? Thank you in advance

[@AllenHart999]

Depends on the boiler. Would be best to ask the individual manufacturers. Thanks.

[@Mohammed-n1h3o]

Can we use 5 core cable

[@Mohammed-n1h3o]

Please make video of condensate pump wiring

[@shaundavey1170]

Just wondered if any one can answer this question. I called Worcester tech to ask which e bus cable they recommend. They told me 0.5mm. HO5w-f asked the local stockist they have never heard of it. So I just install 3 core 0.75 heat resistant flex. Never had any trouble just wondered if any one had a code for the correct cable.

[@kevincranfield5235]

It’s bell wire. 👍

[@kevinbrannan8347]

Does the user control on the boiler ,hot water temp adjustment still work and heating target temperature, if it should I have a fault

[@sajidlunat]

Very informative

[@billyharrison-lock1261]

Any chance of doing a video on the EPH Ember Gateway Allen?

[@rockreel2466]

Any tips on connecting eph to glow-worm compact?

[@dickiedubs3137]

I'm struggling to get two core cable at the moment, I'm having to use 4 core at the moment but on some boilers it can be a real pain

[@danf6491]

Tried to install this on an ideal exclusive 2. Wired to open therm but it won't control the boiler. I've removed the 240v link pin. Only thing I can think is this boiler has an inbuilt clock . Any ideas ?

[@marvincon1417]

Does the baxi usense give the same access to combi boiler water temperatures etc for commissioning?

[@AllenHart999]

Not sure. i do not install them. Thanks.

[@marvincon1417]

@@AllenHart999 Thanks Allen, I got the Combipack 4 today.

[@AllenHart999]

@@marvincon1417 I do like the Combi pack 4 not had one issue so far. Thanks

[@hannahkaur8450]

Hello I need you advice on a boiler issue, willing to pay your advice thanks

[@ragnarjakobsen7722]

I wired one of these combi packs to a baxi 830 the other day but I couldn't set the temperature on the heating and hot water on the boiler after. Baxi tech told me the programmable thermostat has to have to ability to set the temperature on the controls as it overrides it. So I had to wire it to 240v

[@AllenHart999]

Thank You

[@mgbroadsterJ]

Did you manage to get open therm working ?

[@ragnarjakobsen7722]

@@mgbroadsterJ no I just wired it without the opentherm

[@7dayplumbingservices195]

Brilliant video Thanks 👍

[@jacquelinemaitland7603]

How do I get it to come on timed before I come home or in morning

[@AllenHart999]

change the time

[@puddle_puddle]

What about 2+ zones?

[@AllenHart999]

Smart Home maybe

[@graemepalmer5425]

Great video

[@Swwils]

How many boilers will use open therm and weather comp together?

[@AllenHart999]

Most boilers use open therm or weather comp. Why would you need them to both work together? Thanks.

[@Swwils]

@@AllenHart999 depending on how much of opentherm the boiler manufacturer have decided to adopt in the boiler. Some enable all of it other very very little.

[@ricardobranco7357]

@@AllenHart999 if using the Vaillant system (similar) then weather comp will have an effect on the flow temperature, so a sudden drop outside it will start to increase flow temp in anticipation of higher thermal loss before the room stat sees it, there is a heat curve adjustment that is dependent on the thermal loss characteristics of your property. Without WC then you can only be reliant on the room stat and there may be a slight delay if there is a sudden cold front or say sun going down.

[@mgbroadsterJ]

How do you over ride the open therm when balancing the radiators ?

[@MagicDoughnut]

Smash the thermostat to maximum.

[@deano-qj9tj]

Can opentherm stat and weather sensor be wired to the 600 or is it either or?

[@royfugler9971]

Hi Deano, yes you can wire both OpenTherm controls and outdoor sensors to a Baxi 600. OpenTherm to the 2 black wires and outdoor sensor to the 2 brown wires on the low voltage wiring block.

[@bimiuk4051]

Shame I can't find anybody who can install my TADO opentherm with my boiler on a SPLAN. Can you advise please how or what must be changed on a SPLAN to make it work for Opentherm ???

[@rodgerq]

Have you spoken to tado tech?

[@johnburns4017]

Two wires can be into one ferrule. ;)

[@garrynutter860]

Well done Roy. Thanks

[@jackhoskins722]

Roy get those Worcester’s out your training centre your Better than that

[@mehmetaliciftci3495]

Hello, you are giving very good technical information. I wish you would add the explanation feature with Turkish subtitles, I don't know English. I write this translation to Google as an English translation and send it to you. We would be very happy if you add Turkish subtitles to your videos.

[@mgbroadsterJ]

You shouldn't be working if you cant speak and read English .

[@digitaria]

Next time please use a five core heat resistant flex. Less wires going in.😂

[@k20aa]

Great vid but god I hate cheap controls

[@johnburns4017]

How about a vid on professional looking wiring. Heating fitters are mainly pipe men, not electricians. Some of the wiring is appalling. Also they use white flex cable to make their bad wiring stand out. They should know how to use trunking and glands, etc. Glands can be in the sides of trunking with cables running to the boiler. They should not cross pipes with cables. I have ran trunking up to the ceiling so wires run under the floor space, then and down the other side of the boiler to make it look neat with cables avoiding crossing hot pipes. How many times have you seen a job with good pipework spoilt by bad wiring? Most fitters fit the pipes then think of where the wiring is going. A good professional fitter will think out both the pipes and wiring using trunking.

[@danpartlett6464]

If only everyone was as good as you John. My hero

[@johnburns4017]

@@danpartlett6464 🤣 🤣

[@Lutonman2010]

A good electrician would know how to use a dustpan and brush. But we all know that’s never gonna happen either.

[@johnburns4017]

@@Lutonman2010 Most of the wiring on CH boilers is atrocious.Very DIY looking. The thing is, most of them do not know how to do a good professional looking electrical job. They need tuition. If zone valves are a way from the junction box, I use trunking with glands into the side, with the zone valve wiring joined using lever Wagos inside the trunking - similar with cylinder stats. It looks so much neater, with no wiring on show - the only wires seen run to the boiler and devices.

[@BULLEAD]

@@johnburns4017 can we see some pictures of your wiring handiwork?