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I have only ever once come across a system with a 'central heating off' connection that contained a very uncommon type of motorised valve (MoMo, or Motor on, Motor off) that requires this connection to close it. I'm wondering this due to the wiring indication that came with the valve, and also the number of wires in the connecting box.
The reason I say this is because I connected the blue wire to this as your original instruction and the Nest never worked. I wondered if this only went live when the desired temperature was reached and it received a signal from the thermostat? Finally on the programmer what would be the point in providing term 3 to be live when the heating was off. I would be tempted to try and trace it to see what it's connected to, for my own curiosity as much as anything, or disconnect it and see if anything stops working. Once the mains power has been switched on the ChannelPlus H37XL Series 2's display will illuminate. The programmer has a number of pre-programmed functions to assist the installation, which are detailed below; Insert a wire link between the terminals where the two switching wires have just been removed from, so that they are now electrically joined together.
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Then, once the common at the Heatlink is connected, both devices will function identically to each other. Unfortunately, I don't know anything about the valve having never seen your particular type. But electrically speaking, the Channelplus and the Hive are just switches and are identical in their operation, so if your heating works with one, then there is no reason why it wouldn't work with the other.
Finally at least one radiator in the room where the Nest Thermostat is located should not be fitted with a TRV, otherwise it could interfere with the operation of the Nest and prevent it working properly. In reality, the blue wire may not be actually doing anything, but only the original installer would know. However as I said earlier, you are simply exchanging one electrical switch for another and the corresponding terminal at the Heatlink would be (1) Heating Satisfied.
Frequently Asked Questions about Horstmann ChannelPlus H37XL Thermostat
The Secure Meters Horstmann CHANNELPLUS H37XL is a white 3 channel 7 day electronic digital programmer with independent timing of heating and hot water. User friendly, it is designed for domestic use, providing advanced, easily programmed features.
Ideal for the control of two heating zones as well as hot water via separate thermostats and zone valves (e.g. zones 1, 2 and 3 or hot water, heating 1 and 2). Lower the front flap of the unit. On third Channel press the ADVANCE(Enter) and SELECT(Blue) buttons together then release the buttons and the programmer will return to the preset factory settings. Are you saying that with the heating off the the heat satisfied also has a voltage, in the way terminal 3 has on the Horstmann.
More manuals of Thermostats Frequently Asked Questions about Horstmann ChannelPlus H37XL Thermostat Once the secondary circulation is out of the picture, the Zone 1* connections would be wired to the Central heating terminals of the Heatlink and Zone 2* connections to the Hot Water terminals. You should identify what each of the wires connected to the Horstmann does from the diagram you have posted, and then move them to the terminal that has the same function at the Heatlink. All ChannelPlus XL controls are fitted with battery reserve which maintains programmed times in the event of a mains power failure. REAR VIEW OF CHANNELPLUS XL PROGRAMMER TIME AND DATE - The programmer has been pre-set with the current time and date during manufacture. No alteration should be required to the time and date, however if any modifiaction is required please refer to the 'Adjusting Time and Date' section of the user guide. If this is indeed the case, I don't think I can use the Nest unless I use some sort of relay, or change the valve.
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