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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Problem with water tempature and a Worcester 28CDi combi
Hi,
We had a new heating system installed a couple of years ago and I have noticed an issue with the water temapture. My wife was commenting a couple of days ago that the water tempature in the bathroom was not very good and could be described as warm rather than hot. I checked the preasure on the Worcester combi boiler and it was around about 1bar when there was no demand. Last night I refilled the system so that the dial is now reading about 1.5bar. Now the last time I did this it sorted the problem. But this time it seems to have not completely done the trick. The temapture of the water in the kitchen was hot but in the bathroom it was still only warm. This puzzeled me as I cannot see how the water coming from the same boiler can be different between the bathroom and kitchen. Our bathroom is directly above the kitchen so it is not as though the water has far to go. Incidentaly we never get a problem with the radiators - they are always the correct tempature. Thanks Andy |
#2
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Problem with water tempature and a Worcester 28CDi combi
In article , Andy
Coleman writes Hi, We had a new heating system installed a couple of years ago and I have noticed an issue with the water temapture. My wife was commenting a couple of days ago that the water tempature in the bathroom was not very good and could be described as warm rather than hot. I checked the preasure on the Worcester combi boiler and it was around about 1bar when there was no demand. Last night I refilled the system so that the dial is now reading about 1.5bar. Now the last time I did this it sorted the problem. But this time it seems to have not completely done the trick. The temapture of the water in the kitchen was hot but in the bathroom it was still only warm. This puzzeled me as I cannot see how the water coming from the same boiler can be different between the bathroom and kitchen. Our bathroom is directly above the kitchen so it is not as though the water has far to go. Incidentaly we never get a problem with the radiators - they are always the correct tempature. Thanks Andy I have the same boiler and a similar problem... The diverter valve controls the flow of cold water going into the heat exchanger and also the circulation of the heated CH water into the exchanger. The operation of this valve depends on a pressure differential between the cold water supply and the pressure in the pipes going to the hot taps. when you open a hot tap, the pressure drops on one side and the valve moves. When it moves, it allows cold water to pass into the heat exchanger, it also switches the CH circuit to go around the heat exchanger and finally, it operates the flow switch which ignites the burner. There is also manually adjustable flow valve where the water leaves the diverter and goes into the heat exchanger. This allows you to reduce the hot water flow rate, which in turn allows it to spend more time in the exchanger getting hotter. It's all a delicate balance. What's the flow rate like when the taps are full on? If one tap allows more to flow, the water will be cooler. If a tap doesn't allow enough flow, the water will be stone cold. I think 10L per min is the max flow. If anyone knows any more about these things, let me know! I'd like to know why our boiler needs to see 6L/min flow before it even thinks about heating the hot water! The spec says 2.5-3L/min. -- Richard Markham |
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Problem with water tempature and a Worcester 28CDi combi
Hi,
I had a similar problem a month or so back with my Worcester Greenstar. I checked a couple of obvious things such as the controller settings etc - no joy so I resigned myself to a weekend tracking an airlock or something. Anyway, luckily my wife told me that she had cleaned the boiler. Mmmm I thought - took a look at the front panel and she had managed to turn the thermostat fully down. I hadn't expected anything _that_ obvious. I've no idea how the radiators were still hot and the water was wasn't though... Alan. (Andy Coleman) wrote in message . com... snip |
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