Nest - Wiring Opentherm in Ideal Logic 35

z_dane_23

z_dane_23

z_dane_23

Associate
Joined
12 Aug 2016
Posts
3
Hi All,

In the process of wiring up my Nest V3 to my Ideal Logic 35 boiler and need some help. Currently Boiler is connected to Drayton thermostat which uses call for heat cable to control the on/off of the boiler.

My aim is to use Opentherm function of the boiler by installing a harness. Having bought the harness I now have a few questions:
1. Opentherm Harness, once installed and wired it to OT1 and OT2 terminals of the Nest heat link, I assume I no longer need the call for heat wire?
2. Are OT1 and OT2 polarity dependant?
3. I am thinking that the wiring goes as follows:
A. L&N&Gnd from mains goes to the L&N&Gnd of the boiler
B. L&N of the boiler goes to L&N of the heatlink
C. From the boiler's opentherm harness a couple of wires goes to OT1 and OT2 of the heat link
D. Leave the room stat/timer terminal in the boiler "open" (no wires connected)
4. Anything I missed?

pictures & manuals:
Power & room stat bit of the boiler: http://i.imgur.com/DYu7ilI.jpg
Open therm harness: http://idealboilers.com/wp-content/uploads/sites/2/2013/08/Logic-Combi-Opentherm-Harness-Kit.pdf


Would most appreciate if Someone can help!

Thanks in advance.
 
z_dane_23 said:
Hi All,

In the process of wiring up my Nest V3 to my Ideal Logic 35 boiler and need some help. Currently Boiler is connected to Drayton thermostat which uses call for heat cable to control the on/off of the boiler.

My aim is to use Opentherm function of the boiler by installing a harness. Having bought the harness I now have a few questions:
1. Opentherm Harness, once installed and wired it to OT1 and OT2 terminals of the Nest heat link, I assume I no longer need the call for heat wire?
2. Are OT1 and OT2 polarity dependant?
3. I am thinking that the wiring goes as follows:
A. L&N&Gnd from mains goes to the L&N&Gnd of the boiler
B. L&N of the boiler goes to L&N of the heatlink
C. From the boiler's opentherm harness a couple of wires goes to OT1 and OT2 of the heat link
D. Leave the room stat/timer terminal in the boiler "open" (no wires connected)
4. Anything I missed?

pictures & manuals:
Power & room stat bit of the boiler: http://i.imgur.com/DYu7ilI.jpg
Open therm harness: http://idealboilers.com/wp-content/uploads/sites/2/2013/08/Logic-Combi-Opentherm-Harness-Kit.pdf


Would most appreciate if Someone can help!

Thanks in advance.
Click to expand...


Hi z_dane_23,

Did you ever wire your Nest as described above? Just curious, thanks.
 
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