megaflow

[9regnac]

Hi guys

Megaflow cylinder

The connections on it are 1 2 3

In the book for an s plan you use 1 and 2 as your cylinder stat

When you turn the programmer on the zone valve is not working and firing the boiler up.

If you open valve manually it works

Now i thought faulty cylinder stat so i done a continuity test between terminal 1 and 2 and nothing

Between 1 and 3 got continuity

So switched cable from 2 to 3 on stat and it seems to work

Anyone had a similar problem

 

[R G]

Sounds like a neutral is missing somewhere , might be a good idea if posted a diagram ..

 

[telectrix]

are terminals on the stat?

 

[9regnac]

Its a heatrae sadia megaflow cylinder

Its just a connector block marked 1 2 3

Just a standard s plan

 

[davesparks]

Don't run it like that! 1 is the common, 2 is the N/C and 3 is the N/O, if you use 3 instead of 2 to open the 2 port valve you will be heating the mega flow continuously and past it's maximum working temperature.

Now having said that what have you tested and what results did you get?
Have you checked the overheat protection?
Have you checked the temperature the stat is set at?
Is the immersion heater on and so heating the the megaflow up so that it is already warm?

 

[9regnac]

Got it

Use 2 like i did to start with

what happens is even tho you call for heat the valve will not shut until the cylinder loses hot water and starts filling up with cold

Duhhhhhh me silly

 

[9regnac]

Not open should i say

 

[davesparks]

Writing childish nonsense is not going to help you.

What have you tested and what results did you get?

 

[davesparks]

So are you trying to say that the valve does not open until you draw off some of the hot water?

May I ask how much experience you have of working on heating control systems?

 

[9regnac]

Yes the valve does not open until you draw out hot water.

Im23 got a little bit experience.

Checked the stat temperature and set at 60degrees

Done a continuity test on the cylinder stat

 

[davesparks]

Ok, so you have identified that the valve only opens once you have drawn off some of the hot water stored in the cylinder.

Now tell us how you expect the system to operate, and why you think the current operation is incorrect?