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I have a brivas mps ducted heater that cycles between start up and prepurge mod. the control unit with its lcd display runs like this --- aprox control unit on heating ignition ignition (burner lights and splutters) lights again (splutters) unit goes to pre-purge mod i assume to clear the gas out of the burner chamber then it attempts to light agin ??????

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Hi,
If you are getting a sputter flame then the gas air mixture is not right....usually this is because the gas pressure from the gas valve is either too low or too high, but that can also be because the gas pressure into the gas valve is not correct.

To troubleshoot this properly you should use a manometer and check the incoming gas pressure as well as the gas pressure in the manifold. Sometimes adjustments can be made by a tech. on site and other times the gas co. may have to make the adjustments.

Once the gas pressures are verified then air adjustments can be made on the burners to get them burning correctly.

heatman101

Posted on May 26, 2011

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