Frost Thermostat Installation - S plan, Y plan, Combi

Wiring for frost thermostats on S plan, Y plan and combination boiler heating systems. This uses two thermostats in series, the first senses air temperature and the second the temperature of the return heating pipe, so that if activated, the boiler only stays on long enough for the pipes to be heated, rather than heating the whole building. Many boilers have internal frost protection, but that only senses temperature within the boiler, which may not be sufficient if the boiler is located in a warmer part of the building such as in an upstairs room. ► Other videos in this series S Plan:    • Central Heating Electrical Wiring - Part 2...   Y Plan:    • Central Heating Electrical Wiring - Part 3...   Complete list of all heating videos:    • Central Heating Wiring   ► Website - More on this video and many other subjects Website: https://www.flameport.com Page for this video: https://xo4.uk/?23j ► Support this channel: Patreon:   / jwflame   PayPal Donations: https://xo4.uk/?PPP ► Social Media: Twitter:   / jwflame   Facebook:   / jwflame   Instagram:   / jwflame   ► Contact info, sending stuff in: etc.: https://xo4.uk/?YTT