Replacing a Sangamo 410 with a Drayton LP522

[Gus2012]

I did a search and found another similar post but it's just not quite close enough for me to understand.

I have bought a Drayton LP522 to replace a Sangamo 410 heating and hot water timer. I looked at the guidance to say which wires that are currently connected on the Sangamo should go to which connection on the Drayton and I would have a spare red live that currently shows going to the 'motor' (connection no. 5 below)

There are two cables going into the Sangamo. Each has a red, blue, black and green/yellow.

The Sangamo connections are :

1. HW Red from cable 1
2. HW Blue from cable 1
3. HW Blue from cable 2
4. (N) Green/yellow from cable 2 (diagram shows connection to motor)
5. (L) Red from cable 2 (diagram shows connection to motor)
6. CH no connection
7. CH Black from cable 2
8. CH Black from cable 1

Backplate earth - Green/yellow from cable 1

The guide says the connections should be:

LP522 E N L 1 2 3 4
Sangamo E 4 3 2 7 1 8

This would leave me with the wire currently on position 5 as a spare. I'm also confused at connection 4 on the Sangamo which is a Green Yellow and shows as (N) on the diagram.

Can anyone point me in the right direction for connections please ?

diagram sangamo and lp522

• Gus2012
• 9 Jan 2012
• 1

 

[Ihavenojob]

There are several 410's, they have a form number,F1,2,3 etc,printed on the front of the clock,need to know which one first.

 

[Gus2012]

There are several 410's, they have a form number,F1,2,3 etc,printed on the front of the clock,need to know which one first.

Found it, it's an F9

 

[Ihavenojob]

Possibly a spare live wire,old clock would most likely have a common live feed for both heating&hot water,a hot water on/hot water off,heating on & heating off connection,safely terminate the spare and see if it works.

 

[denso13]

Described here http://www.sunvic.co.uk/documentation/datasheets/207ins_w.pdf
The Sunvic isn't what you have but has the same wiring diagram as the LP522, so should be the same connections.

 

[Gus2012]

Described here http://www.sunvic.co.uk/documentation/datasheets/207ins_w.pdf
The Sunvic isn't what you have but has the same wiring diagram as the LP522, so should be the same connections.

That's looking good to me, I'll give it a try in the morning.

 

[Gus2012]

That looked so promising. Plugged in the new unit after wiring the backplate and no power to it. Tried reconnecting the Sangamo and that didn't work at all either. Traced it to a blown 3 amp fuse in the airing cupboard. Now back to the faulty Sangamo with no timer but at least can switch heating and water on and off manually.

I'm not certain whether it's something to do with the green and yellows, one goes to the neutral terminal and one to earth but it works on the Sangamo.

 

[Gus2012]

Possibly a spare live wire,old clock would most likely have a common live feed for both heating&hot water,a hot water on/hot water off,heating on & heating off connection,safely terminate the spare and see if it works.

What would be the safest way to terminate what appears to be the spare live ?