Pipe Stat

[rookery34]

Any help wood be brill.
I have just had my Ideal Classic wall hung boiler,(which is sited in my outside garage)serviced. The plumber pointed out that i needed a Pipe Stat fitting to go with my existing Sunvic TLM2257 frost stat. This is wired with 3 cores and Earth. The system is an S Plan with Lifestyle Heating Pack and LWC 1 wiring centre. I have all the Literature as left by the previous owner.
I believe all wiring from each control goes into the Wiring Centre and after investigating this seems to be the case. Boiler, Frost Stat, room stat, programmer with fused spur at the side of my Programmer in the kitchen.
The Wiring centre is in my airing cupboard upstairs next to the Hot water Cylinder and all wires are accessible. Before I get someone in and also buy a pipe stat. I am after some advice on wiring the pipe stat. Will the pipe stat have to be wired directly to the wiring centre? In this case the job will be too involved as I will have to lift floor boards, carpets etc to get the wire upstairs to the Wiring Centre.
Or can it be wired to the frost stat somehow which is next to the boiler so I could probably do it myself. One other point to mention is i think the room stat is wired to switch off the boiler when switched on by the frost stat. Not sure if this complicates things. House stat is wired with 3 core and earth and is a Drayton T45RTS. I know this because sometimes the boiler fires up even when the Programmer is off, switched on by the Frost Stat as it should, but if i turn room stat down it switches boiler off. Any advice would be welcome.

 

[AdrianUK]

The usual problem with a frost stat in the garage is when the temperature drops & it calls the boiler to heat..... it will continue to call for heat until the garage warms up..... but the garage won't warm up because it doesn't have a radiator..... so the heating stays ON, bypassing the programmer until spring!

One solution to this is to connect a pipe stat (placed on the boiler return pipe) in series with the frost stat but set to open on temperature rise. The idea is that the frost stats closes & fires up the boiler & pump...... when the returning water is warm the pipe stat opens & shuts the system down again until the water in the pipe has gone cold .... at which point it closes again & fires up the boiler...... this whole cycle repeats infinitum until the temperature rises & the frost stat no longer calls for heat.

 

[mfarrow]

Assuming the pipe stat will be wired in series with the frost stat, to switch the boiler off when a reasonable return temperature is reached, then it will be fine to wire it into the frost stat and not take cable all the way back to wiring centre.

 

[viewer]

Something wrong here. The frost stat shouldn't be affected by the setting of the room thermostat (apart from a * setting). It may use the room stat as a sensor. Turning down the room temperature setting shouldn't over-ride the frost or pipe stat settings. They are basically safety devices and have priority.