Old Bell Gossett Circulator Pump Bearing Assembly - This very old Bell Gossett Circulator pump and bearing assembly was found still functioning even after being flooded out several times in a basement. The pump, probably on its last leg, is at least 20 years old and still functioning.
It is unusual for an electric motor to continue to operate after being subjected to flooding. A circulator pump is comprised of an electric motor and a bearing assembly which holds the impeller. (more…)
Hydronic Pump Cavitation - Pump cavitation can cause severe problems to a pump if not addressed and corrected. To understand the cause of cavitation you need to understand the pressure-temperature relationship of the liquid in the loop. Whether it is water or water/glycol mix. As the water passes through the pump it changes the pressure from the suction side to the discharge side of the pump.
If the water’s static pressure drops too much vapor is created causing tiny bubbles in the water or fluid in the loop passing through the pump. These bubbles are unstable and collapse causing severe turbulence inside the bearing assembly and can damage the impeller. (more…)
HVAC Tip - A thermocouple is commonly used in standing pilot gas furnaces and water heaters are technically referred to as a copple element and produces millivolts when heat is applied to the tip. This millivoltage is necessary to keep the pilot valve inside the gas valve open. If the pilot flame goes out, the thermocouple stops generating millivolts. Without the millivolts, the valve closes thus preventing gas from escaping when there is no flame. Thermocouples fail because of oxidation. It is recommended that you keep the pilot lit throughout the year to prevent excess oxidation. The thermocouple can be found in many different types of gas furnaces, gas logs, and gas water heaters. Learn How to Test a Thermocouple with a Multi-Meter
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