Need Help Wiring A Boiler

[Wiksey]

A plumber has fitted a Grant Vortex Pro External Combi and then run away without fitting a controller to it.

The manual asks for a "single channel 230V with voltage free output contacts"

The boiler isolation plug has 5 connectors (CH, HW, E, N, L).

So to have a Central Heating controller connected I'm expecting to connect a switched live to the CH connector on the isolation plug

The Controller that I'm trying to connect is a Salus EP101 which according to the instruction manual has the following terminals:

E - Earth

N - Neutral

L - Live

1 - Normally Closed (N/C)

2 - No Connection

3 - Normally Open (N/C)

4 - Volt Free COM

The Salus website also refers to the connectors 3 & 4 as Switched Output & Common Connection respectively

http://www.salus-tech.com/products/digital-programmers-and-timers/ep101/

Am I right in thinking that I just need to connect 3 on the controller to CH on the boiler and that the other connectors are for if I wanted to connect an external thermostat? or do I need to connect more than this?

 

[Andy™]

4 core flex to boiler. L3&N from boiler plug to L&N of salus. Link L&4 on salus. conenct 3 on salus to L1 on boiler plug. remove any previous link between L1 & L3

you will also need to link L2 and L3 (perm live) on boiler plug if you dont have any external HW controls

 

[Lurch]

Boiler - Programmer

E - E

N - N

L - L

CH - 3

You will also need to link L & 4 at the programmer and L & HW at the boiler plug.

 

[ProDave]

This is an outside oil fired combination boiler.

You can't use a 4 core flex, 5 core minimum. It has to have the permanent L to operate the frost stat so it doesn't freeze, as well as the switched L for CH and switched L for hot water, and of course N and E

The manual is missleading saying it a volt free contact. If controlling it from an external programmer as you are proposing, then a conventional 2 channel programmer with switched L output is what you want.  If you read the manual in more detail, you would find it is possible to knock out a square hole in the boilers control panel, and fit an internal programmer, and THAT is the one that must have volt free contacts if you fit it.
 

 

[Wiksey]

Cheers guys, very much appreciated. I'll stop looking at wiring diagrams now and getting confused!

ProDave - thanks for the clarification on where the volt free bit comes into the whole thing, I'd totally missed that in my confusion.