28cdi combi with f and e

[armyash]

Hi guys,

been out to this boiler, it's a combi but it's not a sealed system it's tank fed.

never seen this before.

customer has complained that hw is intermittent. Colleague of mine has said change the plate. I'm not entirely convinced, went through fault finding, checking pressures and resistances etc and it was pointing to pcb.

Hw hw either boiling hot or hot and cold.

Possibly a sensor?

what do you think? Ever seen this set up before?
thanks

 

[ShaunCorbs]

is there a pressure gauge? and same never heard of one being set up like that

 

[kris]

I have heard but never seen this. Its someone trying to re use the f n e tank when new boiler fitted ... it should be pressurized as the f n e tank is simply for filling the heating.... stupid really

 

[ShaunCorbs]

I have heard but never seen this. Its someone trying to re use the f n e tank when new boiler fitted ... it should be pressurized as the f n e tank is simply for filling the heating.... stupid really

you wouldn't get enough pressure by just the tank you would need a pump/ pressure tester to force it in?

 

[Linkyplumb]

have seen it, and done it on very old systems, whereby you fit a plate heat exchanger in the system, thus having the heating circuit (from combi) through the plate pressurised, and open vented on the other side of the plate.

If it has been done this way then pressure should be filled and read at the boiler, ie on boiler filling loop and gauge

 

[Nostrum]

It was an approved method on the CDI and was in the MI believe it or not!

Have you checked the min and max burner pressure?

 

[Nostrum]

 

[hammers4spanner]

Halstead set up around my way like that , plus vokera can work like that.

 

[Ray Stafford]

Blimey, you youngsters!

I remember selling Worcester heatlaves with an F&E tank on top of the boiler!

<plays hovis music>

 

[ShaunCorbs]

Blimey, you youngsters!

I remember selling Worcester heatlaves with an F&E tank on top of the boiler!

<plays hovis music>

[video=youtube_share;6Mq59ykPnAE]https://youtu.be/6Mq59ykPnAE?t=13[/video]