Latest Discussions : HVAC


05:56PM | 01/18/07
Member Since: 04/23/06
10 lifetime posts
My home is a 2 story + basement colonial style house (2300 sq ft). Heating is done via a hot water/baseboard radiator (hydronic?) system. The furnace is a Weil-Mclain unit (oil) that feeds the hot water to 3 zones (main floor, 2nd floor, garage) as well as heats the hot water tank.

I've been in the 30 year-old house for 4 years and over the past 3 winter seasons have had some issues with the system. First, there has been problems with loud banging in the radiator pipes - to the point where it disturbs our sleep at night. Second, the aquastat, 2nd floor zone valve and the reducing valve were replaced last year. Third, we recently lost heat to out main floor zone. Lastly, I think the furnace cycles on/off much too frequently.

My oil service company is good about coming out to the house when we call them but I'm not sure the system is working as best as it should.

Over the past few heating seasons, I complained about the banging noise in the pipes. The company sent out the repairman as well as the manager. They bled the air out (a few times) and inspected all radiators to ensure that nothing was wrong. This did little to help with the noise.

Around the time the aquastat and reducing valve were replaced, I also noticed that the furnance seemed to cycle on/off more frequently than before. The repairman said the aquastat needed to be replaced since the boiler was heating to too high a temperature and that this may be causing the banging.

Recently when the main floor zone was not getting hot water, the repairman came out to fix the problem. I also told him about the banging pipes (again) and the frequent cycling of the furnace. He couldn't tell me what the true problem was as to why the main zone was not working but the fix invovled replacing the main floor zone valve, the main floor thermostat and also the expansion tank (located above the furnace). He said the he couldn't keep the system at the correct pressure level and that's why the expansion tank needed to be replaced.

At this time my main zone has heat as normal and the banging noise has been reduced significantly (90%) but I do notice that my furnace continues to cycle on/off frequently.

The other night I logged the furnace on/off cycling for 90 minutes between 10:20pm and 11:50pm. I found that the furnace turned on and off a total of 14 times within this 90 minute period. It cycled on/off every 5 to 12 minutes and stayed on each time for between 2 to 3 minutes. During this time, the main floor thrmostat was set a 69deg. and the outside temp was significantly colder- maybe about 30 degs.

Is this normal operation for the system or is something still wrong???

Thanks in advance for any help/comments!

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