What are the temperature setting on a Cotherm TSE 00187 Thermostat? 1 = 10째C, 2 = 25째C. Single control thermostat with a second manual reset over. Poses 2 42 Keygens.
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My sister has a Heatrae Sadia megaflo hot water tank with two immersion heaters for her hot water. Heating is separate, by storage heaters (no gas supply to flats).
She has had some problems, and an electrician has been called a couple of times. Last time, he told her how to reset the thermostat if it tripped. However, there are a couple of things I'd like advice on, please.
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From my reading so far, I think that the lower immersion heater is the overnight timed one, and the upper is the boost one - is this always the case? The thermostats are 'COTHERM type: TSE T115'. There is a little red plastic switch labelled SAFETY which the electrician told her to 'pop out'.
However, using a small screwdriver to press this switch does not release it out again. Should it, in fact, be pushed in? I ask both questions because I took the cover off the lower stat and the switch is level with the blue surround, whereas the top one (which the electrician adjusted last time) is depressed.
However, the boost currently works and the main water heating does not. Finally, if this happens again, is it most likely to be a dodgy stat, or will the whole element need replacing? Sorry for the long post, thanks in advance for any advice. The only time a reset button should be used is when you have two forms of heating for example solid fuel.
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In a way you do have two forms of heating as you have two elements and since thermosyphon will cause water at top to also be heated from bottom element then top one can trip due to fault in bottom one. Since Megaflow is an un-vented system I would be worried about the trip and would want to replace the thermostat. The boost is always top and storage bottom again because of thermosyphon. Because the Megaflow is a special it may work at higher than boiling temperatures so thermostats need careful selection. Not really done much work on them most around here seem to use Glenhill as unlike Megaflow they don't need annual inspections as not pressurised. I'm with Ericmark. The only time I have seen a CoTherm trip in an all-electric Megaflo is when the owner drained down the system and left the elements powered up The red button should be depressed to just below level with the blue housing.
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