Recent content by frqnck

Don't scratch your head, it is now working -- 3 & 4 were inverted. Thank you so much for the help! Do you know if an additional Hive receiver can be added to control the immersion heater of that system?

Hi Echo, I just had a look at the junction box. The ST699 was wired precisely as: ST699-Basic-System-without-thermostat by frqnck posted 16 Apr 2017 at 10:00 PM And I have wired the Hive as follow: ST699 -> Hive L -> L (W.Brown) N -> N (W.Blue & G.Blue) 3 -> 4...

Are you suggesting that the Hive is not suitable with this installation? And that the Nest would be a better fit? Shame as the Hive was very good otherwise. BTW, I don't thing there is a valve in the system, just a Grundfos pump. Which as it stands is connected to terminal 3 HW on (instead of 1...

I am not sure at this stage where terminal 3 (on the Hive that is) really goes to... the junction box where all these are connected is hard to reach. I will try to get to the bottom of this over the next WE. At least we have CH+HW for now. Maybe 3 needs to be on 1 (hot water off) and hard...

In HW-only mode (for some reason) it is not starting the boiler... in CH+HW it is working as expected. Could the terminals 7 and 8 of the ST699 were doing something extra?

I have plugged the Hive in and set as gravity (blue light). The CH+HW is definitely working. But I don't think the HW by itself does (does seem to kickstart the boiler).

For clarity here is the final drawing plan: Rewiring-Plan-Final by frqnck posted 17 Apr 2017 at 11:21 AM

Thank you Echo! Still 5 core so that should be good hopefully. Wil try today. So I will be rewiring as follow: L -> L (W.Brown) N -> N (W.Blue & G.Blue) 3 -> 4 (G.Brown) CH on 4 -> null 5 -> null 6 -> null 7 -> null 8 -> 3 (R.Brown) HW on The ST699 two modes were set as CH+HW (i.e. CH is also...

It looks messy but it is safe. Cables will be replaced by a 5 core flex + new junction. But as it stands, would rewiring as follow work: L -> L (W.Brown) N -> N (W.Blue & G.Blue) 3 -> 4 (G.Brown) CH on 4 -> null 5 -> null 6 -> null 7 -> 1 (G.Brown) HW off 8 -> 3 (R.Brown) HW on

Evening Echo the husky! That's how I inherited it, looks messy indeed :( Both the HW and CH are currently working -- it is a gravity feed. The system does not have any thermostat. I am not sure which pump and valve are linked (hard to reach). Looking at the ST699 manual, it would seem it...

About to engage in the same, although my ST-699 is wired slightly differently. So I am starting with this: ST699B-Honeywell by frqnck posted 16 Apr 2017 at 8:00 PM And the rewiring plan: Rewiring-Plan by frqnck posted 16 Apr 2017 at 8:00 PM Is this plan right? Many thanks