tonyishuk Posted January 1, 2012 Share Posted January 1, 2012 Hi, I have searched the archives but cannot find a similar problem described below. We have a Truma 6e and not sure if it is working as it should, or just works that way? I expect someone will have the answer! When the Truma is used for hot water (60 or 40 degrees) and set to use electricity AND gas, the water heats up by electricity, the gas does not come on. However if we want blown air heating at the same time, the gas comes on as expected. If we use gas ONLY for hot water, the boiler fires up as expected. Does the Truma use just electricity, but not gas when in dual fuel mode for heating water? Or adds gas use if the weather is colder ? Second question The Truma heats up the water ok, to correct temperature, but does not maintain the temperature over a period of use. We seem to get a “one shot” heating of the water, and then have to reset the Truma to produce another boiler full. Is this the way it works? So as to save electricity and gas by not topping up the temperature ? (I can see a reason for that because of leaving the unit working and forgetting that it is switched on whilst away for the day, getting back and have the gas run out) I cannot seem to find anything in the instruction book on how the unit works with regard to the above. In all other respects the unit works as it should. Has anyone “calibrated” the thermostat 1 to 5 into a temperature range? Set at 1 seems to be frost control and between 2 and 3 , seems to be about 18 deg C on ours. Rgds Link to comment Share on other sites More sharing options...
Robinhood Posted January 1, 2012 Share Posted January 1, 2012 The answer to your first question is that it is operating entirely as designed. See the 6E manual (pic below): If left on water only ("summer") operation at 40 or 60, I would expect it to re-heat water once it needs to. The only "anomaly" I not on ours is that the water temperature is often very low when used in winter mode, i.e. room and water heating, and the setting is left at that which does not monitor the water temperature (as the heating cycle is then controlled entirely by the "room" thermostat, irrespective of water temperature). Link to comment Share on other sites More sharing options...
Derek Uzzell Posted January 2, 2012 Share Posted January 2, 2012 tonyishuk - 2012-01-01 6:03 PM ...Second question The Truma heats up the water ok, to correct temperature, but does not maintain the temperature over a period of use. We seem to get a “one shot” heating of the water, and then have to reset the Truma to produce another boiler full. Is this the way it works? So as to save electricity and gas by not topping up the temperature ? (I can see a reason for that because of leaving the unit working and forgetting that it is switched on whilst away for the day, getting back and have the gas run out) I cannot seem to find anything in the instruction book on how the unit works with regard to the above. In all other respects the unit works as it should. Has anyone “calibrated” the thermostat 1 to 5 into a temperature range? Set at 1 seems to be frost control and between 2 and 3 , seems to be about 18 deg C on ours. .. I would guess that your Combi 6E is functioning as Truma intended and it's your expectation of how it should work that's the problem. Having said that, if you 'instruct' the heater to heat the water to 40C or 60C, and then don't use the hot water but leave the heater in water-heating mode, I would expect the heater to maintain the 40C or 60C temperature setting. However, it won't do this on a little-by-little topping-up basis, as there's a significant difference between the 40C (or 60C) setting of the heater's water-temperature thermostat that cuts off water heating and the setting of the thermostat that switches the water heating back on. Basically, the heated water's temperature needs to drop quite a way down before the heater will react and begin to heat it up again. Not sure if that answers your second question, but the combination of mixed gas and 230V heating and various heating 'modes', can give the impression that the heater has a mind of its own. Combis have a 'room temperature' thermostat separate from the heater's control-panel, so the 1-5 setting on the control panel relates to the air-temperature wherever the motorhome converter has chosen to install the room-temperature thermostat. Although there should be the same relationship for all Combis between the control-panel 1-5 setting and the thermostat, if the converter has put the thermostat in an odd place (eg. at floor level by the vehicle's entrance door), obtaining similar air temperatures within different motorhomes may well require different control-panel settings. The room temperature thermostat used to be integrated into the control-panel of Truma C-series 'combination' heaters and earlier control-panels' rotary switch was marked with a temperature scale from 5C to 30C. This was later changed to a 1-9 scale and the current Combi has a 1-5 scale. I once asked the Truma(UK) chaps why the C-series 5-30 scale had been altered to 1-9, saying that it was obvious that whatever scale was used with this type of blown-air heater it could only be considered a rough guide to the air temperature attained within the vehicle. After the laughing stopped, I was told about an Irish guy who had bought a new motorhome with a C-series heater and believed the appliance was not functioning correctly. He had complained to the Irish dealership that had supplied the motorhome, but had been advised that there was nothing wrong. He planned to visit the UK and asked if he could pop into the Truma(UK) HQ for them to test the heater out. This happened; the heater was tested and proved to be working perfectly. Some weeks later a thick envelope arrived at the Truma(UK) premises from the Irish motorhome owner. After returning home he had lived in the vehicle for several days, had set the control-panel's rotary switch to a specific temperature setting and had taken temperature readings at regular intervals. These readings (enclosed in the letter) proved that the heater was incapable of maintaining the selected temperature at all times everywhere throughout the vehicle, so there was plainly something wrong with the appliance. I was assured that this was a true story (Ireland and everything!) and, when I asked what their reply had been, was told "A kind one". Link to comment Share on other sites More sharing options...
Matrix Meanderer Posted January 2, 2012 Share Posted January 2, 2012 Link to comment Share on other sites More sharing options...
tonyishuk Posted January 2, 2012 Author Share Posted January 2, 2012 Many thanks for your replies. It seems that the Truma web site instruction Pdf differs from the Hand over instruction booklets( And they may have been republished with revisions !) A couple of "unusual" items in the Pdf There is no mention of the second Truma dial that I have (and often seen) which allows the user to select which current and / or gas consumption is required. The room temperature sensor should be mounted above the door ( Mine is, so at least thats one tick in the box !) It also says that Setting 4 is about 23 deg C. The PDF states that sterilising the boiler can be achieved by heating to 60 deg and letting the boiler sit for a while and the temp will reach 70 deg C. I told the Navigator that if she waits a little longer she can have a really hot shower. I just potter off to the to the Campsite abultions, there's not room enough for two in the shower. *-) Rgds RTFM , but which one ? ;-) Link to comment Share on other sites More sharing options...
Brian Kirby Posted January 2, 2012 Share Posted January 2, 2012 Tony, follow this link, http://tinyurl.com/73brcws click on "Truma Combi", scroll down to "Combi 6e", and download the one entitled Operating instructions (DE, GB, IT, FR, DK, ES). Go to page 14GB and you should find the power selector switch explained. Hope this helps. Link to comment Share on other sites More sharing options...
tonyishuk Posted January 9, 2012 Author Share Posted January 9, 2012 Thanks I had a "doh" moment as I downloaded the instructions for the 4 and 6 NOT the 4e and 6e, hence my comments above about "missing" bits. All is (slightly) clearer now ! Rgds Link to comment Share on other sites More sharing options...
Derek Uzzell Posted January 9, 2012 Share Posted January 9, 2012 A small point, but heating the water in a Combi to 70°C won't sterilise the appliance. To sterilise it you'd need to introduce chemicals (eg. Truma's "Aquastar" products) into the Combi and heating the water to 70°C maximises those chemicals' efficiency. Link to comment Share on other sites More sharing options...
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