Hive duel channel

[douglas19761976@gmai]

Please can some one help ive fitted hive duel channel to a y plan system heating works as it should the hot water wont work with out the heating switched on the 3 port valve wont switch over to enable hot water i know every thing is wired correct at the reciver my promlem is at the wiring centre there was no room stat ever fitted to the system im not shure if i need a jumper cable fitted in the wiring centre to enable the hot water to switch on without the heating hear is a picture of the wiring centre please can some one help

 

[ericmark]

With the Y plan the boiler is fired up directly from the DHW thermostat when either just DHW or DHW + CH is required, only when only CH is required does the boiler get fired up from the motorised valve.

If never had a room thermostat (other than the TRV heads) then nothing needs bridging.

 

[douglas19761976@gmai]

Yes it gets fired up from the motorised valve but if i just want hot water without the radiators on its not telling the 3 port valve to close and allow hot water only

 

[douglas19761976@gmai]

Where on the old programer i was able select between heating or hot water or both

 

[ericmark]

if i just want hot water without the radiators on its not telling the 3 port valve to close and allow hot water only

It should not need to, default is closed. There are some special three port valves which I think motor closed, but never worked on a system with one of those.

 

[douglas19761976@gmai]

Sorry ive explaned it wrong was meant to say the valve works as soon as you switch the ch on but wont allow hot water only if i select hot water only the light on the hive reciver turns on for the hot water but not sending a hot water command to the 3 port valve

 

[CountryFan]

Can you post a photo of the receiver wiring? Did you take a photo before changing over?

 

[douglas19761976@gmai]

Ive no photos just copyied the wiring from my dan floss prog wiring diagram to the corasponding terminals on my hive wiring diagram live nutral earth termnal 3 hot water on t4 Heating on

 

[Madrab]

if i select hot water only the light on the hive reciver turns on for the hot water but not sending a hot water command to the 3 port valve

As @ericmark mentions - a Y plan system doesn't send anything to the 3 port valve when there's a HW only demand. The Live comes from the programmer HW on > that runs through the cylinder stat > if that is calling for heat the stat then passes that Live on through to the wiring centre and then out to the boiler's SL to turn it on.

The 3 port valve, when there's no call for CH, has no power to it and the internal spring holds the valve to HW only (B Port).

If it's not doing that then unfortunately the wiring's wrong.

 

[ericmark]

The standard three port valve as shown.

There is another version where the spring does not return it. Maybe you have the odd one out, give the part number of the valve so we can check.

 

[douglas19761976@gmai]

Its not a honeywell i replaced it dec 25 as the old one was sticking iy was an old lifestyle one hear is the new one

 

[stem]

Ive no photos just copyied the wiring from my dan floss prog wiring diagram to the corasponding terminals on my hive wiring diagram live nutral earth termnal 3 hot water on t4 Heating on

You don't mention a connection to the Hive's 'Hot Water Off' terminal? (T1) A Y Plan system needs this connection to the motorised valve's grey wire. Although that wouldn't cause the problem you describe (just the opposite in fact, no CH without HW being on as well) it being missing does suggest that all is not well with the wiring in general.

Can we assume that it used to work correctly when the Danfoss was in control and the issue only occurred once the Hive was installed? If so there would have been a connection to HW off at the Danfoss.

 

[douglas19761976@gmai]

All fixed thank you correct wrong cable in the wire centre

 

[Madrab]

Good stuff it's working now -

BTW - I appreciate that things aren't cheap these days and in a lot of cases more expensive doesn't mean better but with these 3 port mid pos valve heads you usually get what you pay for. There is a reason the Honeywell's are more expensive.