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have a worcester heatslave and want a frost stat and pipe stat fitting. The manual shows 2 x single pole frost stats, but this diagram refers to a heated romm not an unheated situation, therefore a pipe stat is required to shut the heating off once heat rise is detected. From the terminal block (X2) the common live comes off the Fs terminal, but then im unsure how the pipe stat is wired up in series with the frost stat, can anyone advise please !!