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Hello, just trying to see if someone here can help me with the wiring of a 3rd gen nest thermostat.
We've just moved into a house, where the boiler is controlled by a Grasslin Towerchron QE2 (Fig.2) programmer to control the central heating and hot water (unvented cylinder). Unfortunately there is no thermostat in the house. We have got a 3rd gen next thermostat and I am hoping to change the programmer with the heatlink and place the nest thermostat in the living room on the stand.
Upon looking at the wiring behind the programmer (Fig. 1) and the corresponding wiring diagram (Fig. 4), I am a bit confused at how to wire this to the nest heatlink. L & N are self explanatory and 1, 2, 3 and 4 on the programmer means HW off, CH off, HW on and CH on respectively. So should I connect 1 and 3 (HW off/on programmer) to 5 and 6 (HW off/on heatlink) and 2 and 4 (CH off/on programmer) to 2 and 3 (heatlink)?
I also noticed that there are two wires connected to both L and N in the old programmer. Any idea where the extra L&N are going?
Any help is very much appreciated.
We've just moved into a house, where the boiler is controlled by a Grasslin Towerchron QE2 (Fig.2) programmer to control the central heating and hot water (unvented cylinder). Unfortunately there is no thermostat in the house. We have got a 3rd gen next thermostat and I am hoping to change the programmer with the heatlink and place the nest thermostat in the living room on the stand.
Upon looking at the wiring behind the programmer (Fig. 1) and the corresponding wiring diagram (Fig. 4), I am a bit confused at how to wire this to the nest heatlink. L & N are self explanatory and 1, 2, 3 and 4 on the programmer means HW off, CH off, HW on and CH on respectively. So should I connect 1 and 3 (HW off/on programmer) to 5 and 6 (HW off/on heatlink) and 2 and 4 (CH off/on programmer) to 2 and 3 (heatlink)?
I also noticed that there are two wires connected to both L and N in the old programmer. Any idea where the extra L&N are going?
Any help is very much appreciated.