garytwigg Posted January 29, 2007 Share Posted January 29, 2007 Hello AllIn my house, (in dept 17) there are 2 tall water heaters (Chauffe-Eau??), one at each end of the property. Each has a 2 way switch (similar to a light switch) labled GV/PV on the walls next to them. I have had a look at the wiring in the back of the switches and they have 3 wires connected at the rear. Any ideas as to what they are for? They dont seem to do anything? The house has Triphase electricity if that makes any difference In addition, I would like to be able to isolate one of the heaters (i.e. turn it off separately) as we never use the hot water from it, apart from when we have guests staying. Thanks in advance Link to comment Share on other sites More sharing options...
BJSLIV Posted January 29, 2007 Share Posted January 29, 2007 Are you sure they are connected with the hot water?If they are do you have two elements in the tanks? hence Grand /Petit Volumeor Do you have a VMC air extraction system ? Grand / Petit Vitesse Link to comment Share on other sites More sharing options...
garytwigg Posted January 29, 2007 Author Share Posted January 29, 2007 Hello BJSLIV Thanks for your reply - I hadn't connected the Grand/Petit Volume or Vitesse scenario and yes we do have a VMC air extraction system with outlets in both rooms where the water heaters are, however the switches are located next to the water heaters rather than near the air vents. I will try & see how much hot water I can get out of the water heaters with the switch in each position. Once again, many thanks for your advice Gary Twigg Link to comment Share on other sites More sharing options...
Anton Redman Posted January 29, 2007 Share Posted January 29, 2007 If you have a modern Tableau d'electrice versus an ancient fuse board both of the cylinders should have their own disjointer so you can switch it off at the board. Link to comment Share on other sites More sharing options...
garytwigg Posted January 30, 2007 Author Share Posted January 30, 2007 The fuse board/s look fairly modern - probably less than 10 years old and there are 3 of them. One controls the underfloor heating & has an on/off switch, a thermostat, a timer clock & what look like several relays on it, one contains all the fuses for the electric (convector?) wall heaters throughout the house and the other contains all the other fuses for the lighting & socket circuits, most of which I have identified by turning them off and seeing what stops working..... together with the switch for the VMC air vac in both bathrooms & the kitchen (both on one switch - but 2 units - one at each end of the house) and the single switch for both of the water heaters. At the moment, as I mentioned previously, whenever we switch the hot water on - we are heating both cylinders, one of which we are not using. I have had a look at the electrics and they connect underneath the unit with little room for any change. I certainly wouldnt want to get involved with any DIY in the wiring I have seen. Do you think that the heaters might have separate fuses? If so, I can, by trial & error identify the correct fuse and remove it until I want to use it. What a great place this is.... Link to comment Share on other sites More sharing options...
Anton Redman Posted January 30, 2007 Share Posted January 30, 2007 If it is a modern instalation the water heater should have its own unique feed all the way from the Tableau. The Tableau should also be either labelled or have ideograms showing which fuse controls which circuit. Link to comment Share on other sites More sharing options...
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