Randall 3020P replacement (wired different)

[northernchappy]

I've seen another thread on here, but wired differently to mine.
I have 4 cables running into the Randall 3020P control box. The wiring into the terminals as follows :

1 = empty
2 = x1 red
3 = x2 neutral (1 black, 1 brown)
4= 1 black
5= empty
6= x2 brown
7 = x3 blue
Earth = x3 green&yellow

Ive read that not all control boxes are suitable for gravity fed heating. Sny suggestions on a replacement?

 

[ianmcd]

No such thing as gravity fed heating, the wires in terminal 3 are not neutrals, never go with wire colours on a heating system, they mean nothing

https://assets.danfoss.com/documents/46857/AN000086404990en-GB0201.pdf

 

[northernchappy]

Ah right, thanks for the info. Is there a compatible replacement i could get where i can look up the corresponding terminals to wire it up? Just something basic without fiddly timer functions

 

[ianmcd]

tell us what system you actually have , you will have a Y plan or S plan open vented system, no such thing as a gravity CH system, you might have a gravity HW system completely different thing, pics are best

 

[gas112]

look at guide and the randal 3020 is under danfoss
https://www.draytoncontrols.co.uk/sites/default/files/D70-9 - Compatibility Guide.pdf

 

[northernchappy]

Dug out some papers. Baxi Bermuda 552 with an indirect loft tank fitted.
The reason for wanting to change the control box is because the timer clock is noisey and i never use it. Can i disconnect the power to the clock mechanism and keep the switches?

 

[ianmcd]

just locate and cut the live to the motor in the programmer, it will be worn cogs in the mechanism that are making the noise, remember and safely isoltae the wire after cutting it, then you can just turn things on and off manually, the clock wont go round but the noise will stop

 

[northernchappy]

Thanks ian and gas, will just do that

 

[Agile]

Best to cut the motor wire in a location where it could be reconnected again in the future.

I had a new one of those a couple of years ago and sold it on Ebay.

I was surprised at just how popular it was and how it sold for a good price of close to £30 ! Seems some people do like something more simple.

The manufacturers seem to employ computer engineers to design something only computer engineers can understand!

 

[northernchappy]

Best to cut the motor wire in a location where it could be reconnected again in the future.

I had a new one of those a couple of years ago and sold it on Ebay.

I was surprised at just how popular it was and how it sold for a good price of close to £30 ! Seems some people do like something more simple.

The manufacturers seem to employ computer engineers to design something only computer engineers can understand!

 

[northernchappy]

For fellow novices :
Unscrewed the rings on Base of the switches and pulled cover off.
Unscrewed the 2 screws at the top and slid unit up backing plate to unplug it from bottom unit, took back off unit and removed the 2 thin wires to the clock