Wire Hive 2 to Halstead Best 60 Boiler

[wrexhamdiy]

Hi, I'm trying to wire Hive 2 to my existing boiler which is a Halstead Best 60 Gravity Boiler.

I've installed new wiring which is:
3 core cable from the spur
3 core cable from the pump
5 core cable from the boiler

I've wired it up as I think it should be but 'Hot Water' on it's own doesn't do anything.
When I put the 'Heating' on the boiler and pump are working fine.

N-Pump/Spur/Boiler Neutrals
L-Spur/Boiler Live
1-Blank
2-Blank
3-Switch Live from Boiler
4-Pump Live from Boiler/Live from the Pump

Here is pictures of the boiler wiring and the Hive wiring.

Any help would be great as I haven't got any hot water without putting the heating on and it's too hot with the weather we've been having.

 

[stem]

Normally for a gravity hot water system with pumped central heating, the Hive is connected as below:



When hot water is required the boiler fires and hot water circulates through the hot water cylinder via gravity. Then when heating is required the pump is also started and circulates hot water through the radiators as well.

Your boiler has a 'pump overun' which means that the boiler has also to be wired to the pump via terminal 2 below, which is unusual for a boiler that is used in this type of system. In this case the boilers terminal 2 should also be connected to the pump, but as the instructions point out the heating will come on with the pump override.

 

[wrexhamdiy]

Thanks for your reply. I’ve already wired it as you have said but still no hot water on it’s own. Any other ideas?

 

[stem]

OK, so something is switching the pump on and circulating the water around the radiators when it is not required. There are two possibilities, this is either the Hive or the Boiler.

First of all, check that the jumper on the boiler set to 'Gravity DHW' and not to 'Fully Pumped'? It should be in the gravity position, if the system was working OK before you installed the Hive.

Next, I assume that the wires in Hive terminal 4 are:

• Grey wire going to boiler terminal 2
• Brown wire is the live to the pump.

If so, you can test the Hive by disconnecting both of the wires from Hive terminal 4 and connecting them together in a separate connector. That way boiler 2 will be connected to the pump. If then you select hot water only, and the pump still circulates water around the radiators, the you know that the boiler is doing this. If the pump doesn't come on now, then the culprit was the Hive.

I believe that it will be the boiler. The instructions that I posted earlier state that if there aren't any additional controls present (ie motorised valves) it's not recommended for your type of system because "the radiators may get hot when the pump overrun is in operation" I suspect that the boiler is operating the pump via its overrun.

 

[wrexhamdiy]

I think I haven't described this problem properly. Sorry.

The pump and boiler are working fine when I select 'heating' but the issue i am having is that when I switch to 'water only' the boiler doesn't do anything.
I thought maybe i'd wired it wrong but from what you said before about the wiring i'm guessing a part on the boiler must not be working properly. I had a new aquastat a few months ago so I know that isn't the problem.

 

[stem]

Ah OK, then the black wire from Hive 3 should go to the boiler terminal 1. If you have a multimeter you can test to see if boiler terminal 1 is at 230V, when the hot water only is selected on. If is is, something is wrong at the boiler end, if not something is wrong at the Hive end.

 

[stem]

BTW I assumed, but forget to check, that the 'Hot Water' light on the Hive receiver is illuminating when you select hot water only. If it isn't, then it's Hive (or it's programming) that is incorrect and the wiring is probably OK.

 

[wrexhamdiy]

Thanks. I did what you said and it turned out to be a faulty fuse in the boiler.

 

[JohnD]

faulty fuse

fuses are very rarely faulty. Do you mean it had blown due to an overload or short circuit? If so, you need to trace and rectify the fault that caused the fuse to blow.

Incorrect wiring is a common example of a fault that can cause a fuse to blow. Often observed after changes have been made to something that previously worked OK.