Horstmann - CentaurPlus C27 - Series 2 - Two Channel 7 Day Programmer

Product Information

There is a separate immersion switch I can use to heat the water, but this can become expensive I I forget to turn it off. And this is what we have remaining for our horstman C27 which is controlling only the hot water now. -so the neutral and live on the left will come out will go straight into the new nest heatlink. Just wondering if somone could advise where the grey and white cable currently in number 1 and the brown one in number 3 will go within the hot water part of the heat link. oil combis work in different ways from gas combis, the easiest way for you is to take a cable from your existing 2 channel programmer

Secure (Horstmann) CentaurPlus C27 (Series 2) 7-day Programmer

Look at the wiring diagram for your make/mode of thermostat that you are removing. If you don't have the instructions for it, a diagram is usually printed inside the lid. This will show which are the two live switching wires, and which is the neutral wire. (If there is a neutral present. Not all thermostats need or have one fitted)CentaurPlus. 7 day control with 3 on/offs per day, advance, over-ride and boost settings and a 6 terminal wall plate. We have bought a new Nest Thermostat to replace our current Horstmann C27 which runs our Central heating and Hot Water on a timed system, we have a Netaheat Profile 303 Boiler.

Manual Horstmann CentaurPlus C27 Thermostat Manual Horstmann CentaurPlus C27 Thermostat

You can now disconnect all of the wires going to the old thermostat and remove the cable and thermostat. The diagram above will allow you to identify what the wires in each terminal of the C27 does. Once identified, the wires are moved to the Nest Heat link terminals that have the same function.This seems to be the other end where the programmer is (the white cable with the blue wire with yellow tape around it) Have just moved into a flat with a trianco Aztec electric boiler paired with a Horstmann Centaurplus C27 programmer. Apart from a big white tank and (supposedly) knowing how to set the timer, that's as far as my knowledge goes with this system. My problem as far as I know is the timer. When I switch on the hw the water doesn't heat but the central heating gets hot!?. The ch light on the timer doesn't come on but the central heating defiantly gets hot. Same if I press the boost button, I hear the system start an the central heating comes on again, without the water getting hot. If I press the ch button the heating comes on fine. In short both the hw and ch buttons only turn on the ch?! note it says Centaur Plus is volt free, so it seems the centaur plus is same as Hive single channel and standard one is same as Hive duel channel, so I would be hunting on the actual device to see if there is a diagram. Your picture clearly shows a brown sleeve on the blue wire going to 3 so clearly a line not neutral. If that's all correct then what do I need to connect the hot water and central heating commons on the nest heat link. I'm reading about jumpers from the live?

Horstmann CentaurPlus C27 Central Heating Programmer Horstmann CentaurPlus C27 Central Heating Programmer

Im removing a Centaurplus C27 with stored hot water and fitting the Evohome setup that I had from my previous house. Old house was gas with on-demand hot water, so I have bought the hot water add on for this, Which leaves me wiring up 2 BDR91s in replacement of the old C27. As you have figured, the old room thermostat can't simply be disconnected as this would leave the heating wiring 'open circuit' and it would not operate, the integrity of the circuit needs to be maintained. As not all thermostats are the same, some working out will be required. The red cable from terminal 4 of the programmer will no longer be required and should be removed from the programmer and made safe (unless for some reason you want the programmer to still have some control over the heating which the following does not allow for). Hi.. Thanks for the reply. The C27 thats in place at the minute is working to the extent where I can turn the heating and HW on and off, Just not set timers, (screen is dead)

This is the Horstmann CentaurPlus C27, a two channel programmer which gives independent control over hot water and heating with up to 3 ON/OFF settings for each day of the week. It also has a 1 hour manual boost button for the hot water and an advance button for the central heating.