February 7th, 2010 Posted in News | No Comments »
In the last few weeks, our service department has experienced an increase in the number of calls from homeowners about their furnaces leaking water or “flooding their basement”.
In short, their furnaces are “boilers” (appliances that heat hot water through radiators). And the water leaking is not the boiler but the Pressure Relief Valve (PRV).
The reason the PRV is leaking is because the boiler is operating at too high a pressure level (usually +30PSI) and the PRV is releasing that pressure down to something more reasonable (15-18PSI).
There are a few remedies.
First, if the boiler has not been maintained in a while (more than a year), the boiler might need a “good” elbow cleaning. The pressure build up is a result in a “congested” heat exchanger where the products of combustion don’t exit the boiler properly and consistently. This will also result in high levels of Carbon Monoxide (CO)!
Second, if you have one of those old Ceiling Expansion Tanks between the joists of your basement, it might be full and need to be drained. (see our article section for a conscience explanation).
Third, the Automatic Water Feed Valve is not regulating the pressure correctly in the system and causing the pressure to “build” up unnecessarily. This will result in the PRV opening up occasionally and will require the AWF valve to be replaced.
Fourth, the PRV due to age and use might have lost is calibration over time and now is constantly dripping water no matter what the pressure in the system reads. Again, this will require replacement of the PRV.
Nevertheless, its not a catastrophe as so many of my customers think it is. The PRV is just trying to tell you that things are not right with your Heating System and it requires a little TLC.
IF this happens to you, don’t worry. Just call our office and ask for a service call. One of our experienced service techs will be happy to come over and address your concerns.