does unvented system need a external moterised pump?

[bluesky]

hi, i am in the training of ACS, just had some reading on unvented hot water system, it certainly needs a motorised pump for water circulation, but if a system vaillant boiler installed, like ecoMAX618, the boiler has a pump inside already, so does the system still need a motorised motor outside the boiler?

also i assume the whole system can be wired like Y system, will it be ok,

thanks a lot,

 

[Puddle]

think you are getting your pumps and motorised valves mixed up maybe

all the pump is doing is circulating the water,it can be internal to the boiler or external, you only need the one though

 

[kimbo]

If you use an s plan you will only need one two port valve as the other is supplied with the unvented cylinder. If you use a Y plan you still have to use the two port valve on the primary flow.

 

[erj]

the pump in the boiler is OK, but you need a zone valve for the hot water so you are better off fitting a S plan rather than a Y plan and a zone valve.

 

[bob the plumber]

If you use an s plan you will only need one two port valve as the other is supplied with the unvented cylinder. If you use a Y plan you still have to use the two port valve on the primary flow.

Incorrect in theory, the reason for the additional 2 port valve is actually classed as another safety device for the unvented cylinder. If one fails and remains open in some way the other will still close. Whats the chance of them both failing

 

[bob the plumber]

Incorrect in theory, the reason for the additional 2 port valve is actually classed as another safety device for the unvented cylinder. If one fails and remains open in some way the other will still close. Whats the chance of them both failing

i mean that in regards to the s plan by the way

 

[fuzzy]

hi, i am in the training of ACS, just had some reading on unvented hot water system, it certainly needs a motorised pump for water circulation, but if a system vaillant boiler installed, like ecoMAX618, the boiler has a pump inside already, so does the system still need a motorised motor outside the boiler?

also i assume the whole system can be wired like Y system, will it be ok,

thanks a lot,

the unvented doesnt need any pump? the primary circs will, either on the circuit aka y / s plan or built into the boiler such as a system boiler

 

[fuzzy]

Incorrect in theory, the reason for the additional 2 port valve is actually classed as another safety device for the unvented cylinder. If one fails and remains open in some way the other will still close. Whats the chance of them both failing

you only need one mate, just has to be wired to a overheat non auto re-setable stat

 

[bob the plumber]

you only need one mate, just has to be wired to a overheat non auto re-setable stat

i got told that when i did my ticket, just did a quick scan on the tinternet, your totally correct man down if you put 2 on though it looks like something you would see on a space ship, i like that look

in all fairness though ive never put 2 on anyway

 

[bluesky]

if we use vaillant ecoMAX 618 which has an internal pump, how to do the wiring? can i just wire the pump to the junction box directly?

cheers

 

[tackleburger]

i mean that in regards to the s plan by the way

S plan is fine foor unvented you don't need anything else. You must fit an additional one on the y plan.

 

[tamz]

if we use vaillant ecoMAX 618 which has an internal pump, how to do the wiring? can i just wire the pump to the junction box directly?

cheers

get someone in to wire it as you obviously have a very poor understanding of how things work.

 

[erj]

the orange wires from the zone valves, go to the switched live in the boiler. In the boiler you will have live, nutral and earth to give a permant power to the boiler then the switched live that makes the boiler and pump run, hope this helps. Once you have done a few and thought about it, it will become clearer.

 

[bluesky]

hi fuzzy, if it is the internal motorised valve, how to do the wiring to a overheat non auto re-setable stat?

 

[tamz]

There is no internal motorised valve.

A motorised valve (2 port ) comes with the unvented kit along with instructions on how to wire it.