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Hot water heated by boiler and piped to "fin-tube" baseboard units mounted along walls. The fins increase the surface area of heat dissipation making the unit more efficient.
Aquastat - The thermostat that regulates the boiler's temperature Gas Valve and Burners - Combustion assembly that heats the water chamber Combination Pressure / Temperature Gage (Tridicator) - Monitors water temperature and pressure Water Feed Valve - Controls water flow to boiler Pressure Reducing Valve - Automatically maintains correct water pressure at about 12-15 psi Air Vent or air bleeder valve- Automatically purges unwanted air from hydronic system Guide to Air Bleeder Valves on Heating Systemse Expansion Tank - Critical component that allows expansion of water as it heats. Flow Control Valve - Regulates flow of hot water to system Pressure Relief Valve - Relieves high water pressure Baseboard, Source: Troubleshooting a Hot Water Boiler - Components at homerepair.about.com Troubleshooting a Hot Water Boiler - Poor Heating Performance
Scale build up is usually not a problem in hot water boilers. Although make up water contains dissolved minerals, system leaks discharge water with an equal amount of dissolved minerals. Since as many minerals are leaving the boiler system as enter it; minerals do not have the opportunity to accumulate in the boiler water.
Bleeding / Purging air from a system. Turn off return valve Open drain valve with hose attached Put hose in a bucket and let it drain until there are no more bubbles Components: air_bleed_valve.jpg purge-and-balance-valve.jpg Put the "balancing" screw slot in like with the pipe run for open and turn 90° to close. Close to purge. Adjust somewhere between open and closed to balance heat in each zone in a multi-zone system.Links:
Bleeding a Hot Water Boiler - YouTube