Help on hive wiring - 330+ boiler

[Silverfalcon]

Hi All, Looking for some help on the Hire wiring for my 330+ boiler.

photos attached of how the wiring currently is.

I also have a separate switch for the water storage heater, I am unsure at this stage if I am looking integrate this or try and keep things simple.

I believe the 330+ is a heat only boiler and not a combi.

what I am mostly unsure of at the moment is the bridged wires.

Thanks

 

[stem]

That is an odd installation. First of all it's an old controller, normally associated with a system having gravity circulation of hot water and pumped central heating. However, in your case there is only one live switched wire which is the yellow wire in terminal 4. Normally there would be a switched live wire in terminal 6 (Hot Water) that would fire up the boiler, and another in terminal 4 that also switches on the pump (Central Heating)

However, that arrangement would correspond with:

I also have a separate switch for the water storage heater, I am unsure at this stage if I am looking integrate this or try and keep things simple.

So, it would appear that the Sangamo is presently wired up only to control the central heating. If so, you and you wish to fit Hive, you would use the single channel version of the Hive.

If you wish to control the hot water too, then assuming it is connected / piped to the boiler in a way that would allow it to be connected, then you would use a dual channel version of Hive, but the system would need rewiring pretty much from scratch. And that assumes that the boiler is connected to the hot water system. It could be but there's no indication from your post that it is. More information would be required to confirm this. However, I wondered by:

water storage heater

You are referring to an electric immersion heater??? If so, that can't be connected to a Hive receiver.

what I am mostly unsure of at the moment is the bridged wires.

The bridged wires are links between to the COM terminal of the switches. They are already made internally inside the Hive (dual channel version) but not the single channel version where a link between L and 1 would be required for mains operated equipment (230 VAC)

 

[ericmark]

It would seem the red, yellow, blue cable is cable to boiler, seems a little odd as both sets of contacts seem to be used, so I would want to test to be sure, however would expect to find blue = neutral, Red = permanent line, and yellow switched line.

The Hive uses a common back plate also used with other makes, there are three or four options

depending if single, two or three channel and if opentherm is used, I don't think Hive has the three channel or opentherm option, so with single channel you need a bridge wire line to 1 (Com) the other two are not volt free so not required, so it depends on which you select as to how wired.

The contacts are likely rated around 5 amp, so not suitable to power an immersion heater, one could use a relay, but can't see why one would want to.

Also can't see many central heating systems where there is a cylinder for domestic hot water not having a hot coil and some method to heat the domestic hot water from the boiler.

In my case we have C Plan and I can't stop the boiler heating DHW, I have the option of not running the pump so only DHW is heated, which was used, but is no longer used since solar panels fitted and the DHW in summer is heated when there is excess from solar panels. Autumn and Spring we can have a time when DHW is not heated, but not enough times to worry about.

Hive has a special function to work with C Plan, with separate outputs for boiler and pump. Not seen it with any other system, so you need to work out what you have. The odd way the existing unit is wired points to some failure in the past and some temporary rewire to get around the problem.

So for me the first thing is to work out how the existing is working. This

seems to be wiring for your boiler, not option for opentherm so likely Hive is best option, although I do see Ebus so maybe you need to look further it depends on how the ebus can be used, some boilers do offer their own analogue thermostat, but it may not connect to TRV heads, and the main thing today is to have each room independently controlled.

I see @stem has beat me to it, he has far more knowledge to myself, so go by what he says.

 

[Silverfalcon]

Thanks for the response.

@stem, I was referring to immersion heater, good to know it cant handle it, I did think that might be the case or a relay may be used, I only thought it could be convenient to turn on with a boost button but all in all does not seem worth any extra complication to make something like that work.

Looks like I have a single channel.

So if I am following correctly, testing to confirm oncourse, but it looks like moving pin 2 to Hive 1 and pin 4 to hive 3 and L=L N=N E=E with a L to hive 1 bridge and removing the other bridge should be the way forward?

 

[stem]

Sounds right to me.

So you will end up with:

Yellow wire now in terminal 4 goes to Hive 3 (Heating on)

Other wires to N, L & E as appropriate

Only one link required between L and 1 (Common)

 

[Silverfalcon]

Thanks for the help.