Grant 50/90 Oil Boiler: connecting the wireless Thermostat
Posted: 06 Jul 2020, 23:45
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:
Here's an image of what I had before I started:
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.
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:
Here's an image of what I had before I started:
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.