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Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 06 Jul 2020, 23:45
by Moose
Hi,

Great forum and I've been trawling it for an answer but can't find it, so I'm reaching out directly. I do apologies if this has been answered a bunch of times before but I couldn't find it.

I've a Grant 50/90 boiler with a basic analogue timer which just turns it on and off.

I had assumed I could leave this connected and turned to permanently "ON" and then connect the wireless RELAY to the boiler as a thermostat to override it. There wasn't a room thermostat ever fitted, as far as I can make out.

Here's the Grant wiring diagram:

Screenshot 2020-07-06 at 22.30.42.png
Screenshot 2020-07-06 at 22.30.42.png (43.01 KiB) Viewed 118 times


Here's an image of what I had before I started:


Screenshot 2020-07-06 at 22.32.14.png
Screenshot 2020-07-06 at 22.32.14.png (527.45 KiB) Viewed 118 times


So, I connected the RELAY as such:

Brown to Switched Live from Prgrammer (1)
Blue to to Mains Neutral (3)
Grey to (5) To CH valve if required
Black to (6) and removed the yellow looped wire

The RELAY gets power but it seems that the boiler just stays on constantly and the Thermostat has no effect on it.

I've triple checks all the wires are securely in place and can only assume I've placed the Black/Grey wires in the incorrect place or I've neglected to disconnect something important that causes the boiler to have constant power.

Any help or guidance on this would be really appreciated.

Re: Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 07 Jul 2020, 00:12
by GEORGzer
I can‘t tell from the photo but if there is currently nothing connected to „2“, move over the wire from „1“, so that there is nothing connected to „1“.

Then connect the Netatmo Relais as follows:
Brown to „2“
Blue to „3“
Black to „2“ as well
Grey to „1“

Re: Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 07 Jul 2020, 17:36
by Moose
GEORGzer wrote:
07 Jul 2020, 00:12
I can‘t tell from the photo but if there is currently nothing connected to „2“, move over the wire from „1“, so that there is nothing connected to „1“.

Then connect the Netatmo Relais as follows:
Brown to „2“
Blue to „3“
Black to „2“ as well
Grey to „1“
Thanks a million for this reply. Really appreciate it.

Looks like I tackled it completely wrong. I'll go rewire it now and let you know how I get on.

Cheers!

Re: Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 07 Jul 2020, 20:14
by GEORGzer
It‘s just a hunch because „Switched Live from Programmer“ means it‘s a live wire coming from a thermostat and if no thermostat is installed, they usually just connect the phase.

If nothing is connected to „2“ you can miss-use that terminal to connect the mentioned wires.

Re: Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 07 Jul 2020, 23:21
by Moose
GEORGzer wrote:
07 Jul 2020, 20:14
It‘s just a hunch because „Switched Live from Programmer“ means it‘s a live wire coming from a thermostat and if no thermostat is installed, they usually just connect the phase.

If nothing is connected to „2“ you can miss-use that terminal to connect the mentioned wires.
Worked like a charm! Up and running for the last five hours without a hitch.

Thanks again for your help! You’ve built up plenty of good karma, cheers 👍🏻

Re: Grant 50/90 Oil Boiler: connecting the wireless Thermostat

Posted: 07 Jul 2020, 23:23
by GEORGzer
;)