Salus rxrt505 to Logic 30

[sinky]

Looking for some help.
Bought a house. The boiler is a logic 30 and the control is missing the wireless thermostat. Looks like it was taken when the house was cleared. I have a salus rxrt505 receiver wired to the boiler. So the only way to control the boiler is from the knob on the boiler by turning from off to water or to water + heating.
Went looking for a salus thermostat and I see the receiver is obsolete so thought I'd replace it rather than hunt for an older compatible thermostat.

Wanted to keep it simple and go salus so wiring will be the same. Looked at a dt625 as an option.

Then opened up the boiler to check wiring. Pic attached. I have the 2 wires going from the receiver to the room stat, also the L and N to power the receiver sharing the live feed to the boiler.

Then I took the receiver off the wall to check the wiring to what I've read.

Here's what's confusing me. Accorsing to what ive read The 2 wires from the room stat terminals in the boiler should go to the N.O. and Com in the receiver. But the 2 wires are twisted together and put into the N.O terminal.

I've hunted on here and on the net and can't figure out how or why it would be like this.

Has it been wired wrong or am I missing something.

Thanks in advance of any replies.

 

[Stuckinarut]

You can literally go for any wireless thermostat and could even get opentherm for better modulation control. Your wiring might be like that as the handset could have failed, so therefore creating a link so heating works. Please ensure you get the boiler checked for safety afterwards as that cover forms part of the combustion circuit and Ideal Logic burner seals are porous and could emit products of combustion/Carbon Monoxide.

 

[sinky]

You can literally go for any wireless thermostat and could even get opentherm for better modulation control. Your wiring might be like that as the handset could have failed, so therefore creating a link so heating works. Please ensure you get the boiler checked for safety afterwards as that cover forms part of the combustion circuit and Ideal Logic burner seals are porous and could emit products of combustion/Carbon Monoxide.

Thank for the reply. I didn't think about the possibility of the thermostat failing and they had this done to allow operation manually from the boiler.
I'm right though that this isn't how it should be wired. It should be as per schematic.
Re open therm the module/part isn't inside this boiler. There's space for it but no terminals or wiring.

 

[Stuckinarut]

Thank for the reply. I didn't think about the possibility of the thermostat failing and they had this done to allow operation manually from the boiler.
I'm right though that this isn't how it should be wired. It should be as per schematic.
Re open therm the module/part isn't inside this boiler. There's space for it but no terminals or wiring.

Apologies, I thought most Logics had open therm, but yours doesn’t. It should be wired as per schematic, but I think we’ve established the reason why not.