Fagor 3-Way Boiler Valve Thread Fee20E/1N Mu0884600

Gas boiler. A boiler is an appliance used to heat water with a hydraulic heating system. The hot water is distributed throughout the house in pipes and radiates heat into the rooms either with steel radiators (in newer houses) or cast iron radiators (in older houses) or with underfloor convection heaters (in newer houses). Once the radiator or convection heater is heated with the hot water, the water returns to the boiler to be reheated and the water circulation circuit continues. In addition to radiators, the boiler is also used with radiant floor heating systems. These boilers can use natural gas or propane as fuel (gas) or can burn fuel oil (oil). Fuel oil boilers require more maintenance than their gas counterparts and require regular attention to the blower and oil filter. Boiler components. Boiler components. The boiler is more complex than forced air heating in that it has more parts, valves and controls. However, gas boilers are quite reliable and most problems, when they occur, are normally related to the expansion tank or the water circulator pumps. Let's take a look at the main components of a boiler for a forced water (hydraulic) system: Hot water supply side: Aquastat. The thermostat that regulates the boiler temperature. Gas valve and burners - Combustion assembly that heats the water chamber. Combined pressure/temperature gauge (tridicator) - Monitors water temperature and pressure. Water supply valve - Controls water flow to the boiler. Pressure reduction valve - Automatically maintains correct water pressure at around 12-15 psi. Air vent - Automatically removes unwanted air from the hydraulic system. Expansion tank - Critical component that allows water to expand as it heats. There are two types of expansion tanks, the horizontal steel expansion tank, an older and larger style, and the newer smaller diaphragm style expansion tank. Flow control valve - Regulates hot water flow to the system. Pressure relief valve - Relieves high water pressure. Hot water return side: Circulator - Electric pump that circulates water through the system. Drain valve - Valve that opens to allow the boiler to drain. PROBLEM: The boiler produces no heat. Electric ignition (Intermittent pilot). © Home-Cost.com 2007. PROBLEM: The boiler produces no heat. Possible causes. The boiler has no power. Water level is low. Pilot light failure or electric burner ignition failure. Thermostat failure. Possible repairs. A circuit breaker or fuse controlling the boiler is tripped or blown. Reset the tripped circuit breaker. Replace the blown fuse. Maintain the water level at half full. The boiler's automatic filling system using the pressure relief valve should maintain the correct water level by maintaining pressure levels of 12 to 15 psi. If you do not have a pressure reduction valve, you can also supply the boiler manually by opening the water supply valve until the boiler pressure reaches 12 psi. The natural gas or propane control valve to the burner is closed. The pilot light is off. Relight the pilot. Check for possible problems in the electronic ignition system if the boiler does not have a pilot. Check that the thermostat is in heating mode and that it has the correct temperature set. Try adjusting the thermostat by raising or lowering the temperature a few degrees. PROBLEM: Insufficient heating. Boiler gauge (temperature and pressure combination indicator). Possible causes. Sudden change: inappropriate water levels. Gradual change: Mineral deposits in the boiler and heat exchanger. Possible repairs. Check the reading on the Tridicator (combined pressure/temperature indicator). If water pressure is low (below 12 psi) the system needs water added. The boiler's automatic filling system, which uses the pressure relief valve, should maintain an adequate water level by maintaining a pressure of 12-15 psi. If you do not have a pressure relief valve, you can also supply the boiler manually by opening the water supply valve until the boiler reaches 12 psi. If the problem developed gradually, then the causes could be deposits in the system. Drain the boiler or call a technician for this task. The expansion tank may have too much or too little water. It must be properly charged with air to prevent boiling. See the following section for a more detailed summary of the expansion tank. PROBLEM: The expansion tank has excess water and inadequate air. Amtrol diaphragm style boiler expansion tank. © Amtrol 2007. PROBLEM: The expansion tank has