I have a forced-hot-water heating system with three zones, first floor, second floor, and water tank. After some maintenance on the system the second floor is constantly heating, even though the thermostat is off. I checked the voltage on the circulator pump and it is zero, so the pump is not running. It sounds like it is acting like a gravity-fed system. There are manual valves on the system, but the only things in the loops that are controlled by the thermostats are the circulator pumps. Do the pumps act as valves when they are not pumping? That was my guess so I replaced the pump, but my registers are still hot. If the pump does NOT act as a valve, what is supposed to prevent the hot water from moving through the system when the pumps are not running? I need some HVAC basics here. Thanks!
2006-10-16
15:37:18
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4 answers
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asked by
dsr
2
in
Maintenance & Repairs