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Heating and Cooling
Published in Stan Harbuck, Donna Harbuck, Residential Energy Auditing and Improvement, 2021
Some boilers have a safety interlock which keeps the boiler from operating unless the pump is running. You can determine what kind of device controls the pump and check its operation. You can also inspect the condition and operation of the pump. A loud pump may have bad bearings or a faulty motor. You can inspect the seal between the motor and the pump housing for signs of leakage. Examine the condition of all electrical wiring and connections. Feel the return line after the system has been operating for a short time, it should be warm. If it is not, the pump may be faulty. In heating systems used for generating domestic hot water, the thermostat will control the circulating pump and an aquastat will control the burner.
Investigation of real-life operating patterns of wood-burning appliances using stack temperature data
Published in Journal of the Air & Waste Management Association, 2020
Mahdi Ahmadi, Josh Minot, George Allen, Lisa Rector
At all times, the boiler is either heating the system water (in-use), or it is not (not-in-use). In-use and not-in-use modes are readily distinguishable in the temperature time series. When the boiler is in the in-use mode, the stack temperature fluctuates considerably, while in the not-in-use mode it remains flat. These usage modes are shown in Figure 2. The first pattern shows the semi-regular cycling of temperature due to the operation of the automatic air damper. A thermostat inside the building controls the call for heat by adjusting the pumps circulating hot water from the water jacket that surrounds the burner. An aquastat maintains the water temperature between set ranges. When the water temperature falls below the set range, an air damper opens, igniting the fire. The damper stays open until the temperature of the water jacket reaches the upper-temperature range. The aquastat controls lead to cyclical variations of temperatures in the boiler firebox and stack.