I’m hoping someone with more experience of central heating systems can help with this problem, as I’m sure it must be a common situation.
A plumber has replaced a system boiler, which heats the central heating and also a hot water cylinder. The system comprises a programmer, pump, valve actuator, hot water cylinder (with cylinder stat) and room stat which are all located in the same place – an airing cupboard. The boiler itself is in a different place – the kitchen.
There is twin and earth (i.e. no switched live) between the wiring centre in the airing cupboard and the boiler. This means that when the programmer/stats stops calling for heat the power to the boiler is killed completely, so the pump overrun in the boiler doesn’t work. Likewise, when the programmer/stats start calling for heat the boiler effectively gets powered up from scratch and has to warm up before it starts producing heat.
It’s not practical to run 3-core between the airing cupboard and the boiler, so I think I need some kind of wireless solution so the boiler can be left permanently powered up and just receive a signal when it’s time to produce heat.
Ideas I have had are:
1. Taking a spur off a plug in the kitchen for a permanent L+N, and using one core from the existing twin and earth as a switched live. This doesn’t seem ideal as the boiler would then be powered from two different circuits.
2. A wireless programmer. Seems unnecessarily expensive.
3. Using the existing twin and earth as a permanent L+N and installing an RF stat, left on its highest setting, to tell the boiler when heat is required. This seems like a bodge.
4. Some other kind of wireless contactor?
This must be a common situation with a proper fix. Please can someone help?
Thanks in advance.
A plumber has replaced a system boiler, which heats the central heating and also a hot water cylinder. The system comprises a programmer, pump, valve actuator, hot water cylinder (with cylinder stat) and room stat which are all located in the same place – an airing cupboard. The boiler itself is in a different place – the kitchen.
There is twin and earth (i.e. no switched live) between the wiring centre in the airing cupboard and the boiler. This means that when the programmer/stats stops calling for heat the power to the boiler is killed completely, so the pump overrun in the boiler doesn’t work. Likewise, when the programmer/stats start calling for heat the boiler effectively gets powered up from scratch and has to warm up before it starts producing heat.
It’s not practical to run 3-core between the airing cupboard and the boiler, so I think I need some kind of wireless solution so the boiler can be left permanently powered up and just receive a signal when it’s time to produce heat.
Ideas I have had are:
1. Taking a spur off a plug in the kitchen for a permanent L+N, and using one core from the existing twin and earth as a switched live. This doesn’t seem ideal as the boiler would then be powered from two different circuits.
2. A wireless programmer. Seems unnecessarily expensive.
3. Using the existing twin and earth as a permanent L+N and installing an RF stat, left on its highest setting, to tell the boiler when heat is required. This seems like a bodge.
4. Some other kind of wireless contactor?
This must be a common situation with a proper fix. Please can someone help?
Thanks in advance.