Updating Honeywell T6360 to 16 amp digital thermostat

[Vincenze]

I have an “S” type gravity heating system. I have 2 T6360 thermostats in the house. These signal to the boiler control panel.

I want to replace these with 2 digital thermostats I bought.

The mechanical Honeywell T6360s (see wiring pic) are L, N, switched live. See T6360 wiring diagram.

The digital thermostats I bought are 16amp (see pics). Mine are the wiring system GB (which states for electric heating).

My question is how to wire them in. Should I have bought the GC wiring system showing the 3 amp switch? Can I use the GB wiring system?

Thank you in advance for any guidance

 

[CBW]

I don’t think the electric heating thermostat will work, so yes, you should have got the GC ones (assuming you have a gas boiler?).

 

[Vincenze]

Thanks Chris. Yes, Potterton boiler, HW/CH timer/ 2 thermostats/ “T” CH and HW motorised valves/ HW cylinder - all these managed through boiler control BUS. The 2 thermostat wires run out of this boiler control BUS.

The BUS actuator suggests a need for a 3amp switch thermostat.

The advertising blurb on eBay is very vague. I should have paid better attention.

 

[picasso]

Can you post a pic of the bus system ?

 

[Vincenze]

Picasso,

Not pretty. Not my work. Possibly in the BUS lies the reason my Potterton won’t switch off (regardless of thermostat or timer action) unless turned off at mains. That’s another story.

5 wires up to BUS -
1 mains,
2 Prog 1,
3 Prog 2,
4 House stat
5 Extension stat.

Progs 1 and 2 wires connect HW/CH timer (see pic)

2 wires down to BUS -
1 from hot water cylinder switch
2 hot cylinder thermostat

 

[picasso]

Its not a bus system and the stats will work fine with your system, can you post a pic of your zone valve/s ?

 

[ianmcd]

The GA, GB and GC are all the same thermostat, it is just how you wire them up that is different

 

[Vincenze]

Picasso, Yippee. Ah, OK, not a BUSbar, I see that now. A spaghetti junction?

Will send valve set up pic. 2 x “T” CH MVs, one taking heat to house, other to granny annexe. Third “T” HW. I do wonder if one MV isn’t working properly causing Potterton nonstop on.

Thanks, Ian. Totally didn’t see that - 3 wiring options, one stat. Stat has capacity up to 16amps.

I think........
T6360 to New stat
L/1 to L
N/2 to N
SL/3 to 2

And on new stat live connector 1 to L

Thanks for advice