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Post by rocketmanbkk on Dec 12, 2017 16:23:35 GMT
A combi was fitted in a house. Only the kitchen sink uses it as upstairs there’s an econ 7 tank to serve the bathroom. All understood.
Now then, an unvented is going in upstairs that’ll be controlled by the combi. Ok, no problems with that.
2 zone valves are going in - ok.
My mate said the unvented upstairs will be controlled by the thermostat & no timer.
I may be stupid but I can’t get my head around it
A combi serves when there is demand. Is it then the case as per your ch on a combi the thermostat will control it but what about a timer?
My heating is on a combi, has a wireless stat but only comes on if the timer tells it to & not by room temperature otherwise it’ll be on & off all day & night.
So the unvented will be continually hot as per the stat but no timer, so the combi will come on & off 24hrs a day to maintain the temp at say 65 degrees
Or am I missing something?
Thx all
It might take a video on this one Tom!
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Post by tomplum on Dec 12, 2017 17:00:58 GMT
You say there are two zone valves, I'm thinking one for the heating and one for the water in the cylinder, So the heating circs from the boiler heats the rads and upstairs water, the programmer for the boiler will have water/heating controls, just like a tradition system, water only will go to the cylinder, first tee and last tee, for summer when the heating is not wanted,
In short, the heating circs are heating the water as another radiator on its own,
thats if i'm reading it right,,
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Post by rocketmanbkk on Dec 12, 2017 17:21:11 GMT
Mmmm.... I’m. not really with you Tom.
So the new unvented will have a coil which will be on the same pipe as the ch rad? Thus when the heating is on & the zone valve opens it’ll heat the water in the tank & when the other zone valve is open it’ll heat the rads. If both zone valves are open both rads & tank will heat up?
But if you only want tank water or ch water surely you must need a timer or it’ll be on/off 24hrs.
Also if there’s no timers how will the zone valves know when to open & close?
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Post by tomplum on Dec 12, 2017 17:29:10 GMT
If he's using a zone valve, he will need a stat on the cylinder and a programmer, I'm guessing a normal 2 channel heating programmer near the boiler to control, the cylinder will come with the stat included, the only other way is to use the immersion heaters in the cylinder to control the water, but if he is doing that,,why put 2 zone valves on
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Post by rocketmanbkk on Dec 12, 2017 17:45:10 GMT
If he's using a zone valve, he will need a stat on the cylinder and a programmer, I'm guessing a normal 2 channel heating programmer near the boiler to control, the cylinder will come with the stat included, the only other way is to use the immersion heaters in the cylinder to control the water, but if he is doing that,,why put 2 zone valves on Yes. That’s what’s confusing me Surely it needs the programmer. I’ll ask him again on Thursday if I see him. Cheers Tom |
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Post by tomplum on Dec 12, 2017 17:49:20 GMT
there's nothing wrong with your thinking Rocky, He must have explained it wrong or he knows something we don't,  |
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Post by rocketmanbkk on Dec 12, 2017 18:09:22 GMT
I’ll report back Tom
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Post by rocketmanbkk on Dec 12, 2017 18:10:11 GMT
I understand it’s like turning things into an s plan
I’ll get to the bottom of it
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Post by Deleted on Dec 12, 2017 20:52:56 GMT
Seems a lot of fucking about rocky why not fit one or the other, why fit a combi and a unvented I'd just stick a standard boiler in or convert system for a combi set up.
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Post by tomplum on Dec 12, 2017 21:42:20 GMT
I can see the advantage of haveing a combi down stairs and cylinder up, because hot water can get to the sink quick from the combi and not lose pressure on an upstairs shower, its a good option in a big house,  |
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Post by Deleted on Dec 12, 2017 21:52:10 GMT
In a big house though Tom I'd install a secondary return, I understand what your saying and combis are great but are still really a one appliance tool. if it is a smaller house and sounds like it is with the economy 7 direct cylinder upstairs I'd either go just combi or standard. |
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Post by battle1066 on Dec 12, 2017 21:59:13 GMT
I agree with PB seems only a small property so why a complicated install?
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Post by tomplum on Dec 12, 2017 21:59:50 GMT
yes, of course we are just speculating, Only rockey and his mate can see the project, I'll be interested in rockys feedback and pics, we are all never too old or experianced to learn more, bring it on Rocky |
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Post by rocketmanbkk on Dec 13, 2017 7:27:26 GMT
Seems a lot of fucking about rocky why not fit one or the other, why fit a combi and a unvented I'd just stick a standard boiler in or convert system for a combi set up. The combi is already in & the customer now wants this done  |
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Post by rocketmanbkk on Dec 13, 2017 7:48:12 GMT
Seems a lot of fucking about rocky why not fit one or the other, why fit a combi and a unvented I'd just stick a standard boiler in or convert system for a combi set up. The combi is already in & the customer now wants this done Sorry, that combi went in. Now customer decided to have new unvented & rads. House having a huge extension on the rear. |
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