1 hvacr214 – electrical for oil oil solenoid valves
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HVACR214 – Electrical for Oil
HVACR214 – Electrical for Oil
Oil Solenoid ValvesOil Solenoid Valves
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The Solenoid ValveThe Solenoid Valve
• A solenoid valve is an electronic valve.• A coil of wire is energizes and creates
magnetism.• The magnetism either opens or closes a
valve.• A valve that is open when de-energized is
considered a normally open valve.• A valve that is closed when de-energized is
considered a normally closed valve.
• A solenoid valve is an electronic valve.• A coil of wire is energizes and creates
magnetism.• The magnetism either opens or closes a
valve.• A valve that is open when de-energized is
considered a normally open valve.• A valve that is closed when de-energized is
considered a normally closed valve.
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The Solenoid ValveThe Solenoid Valve
• Used in both older and newer high pressure burners.– Older burners this is a field installation– Newer burners this valve is included with the burner
• The valve has two purposes– Delay the flow of oil to the burner at startup– Provide a clean shutoff of the flow of oil at
shutdown.
• Used in both older and newer high pressure burners.– Older burners this is a field installation– Newer burners this valve is included with the burner
• The valve has two purposes– Delay the flow of oil to the burner at startup– Provide a clean shutoff of the flow of oil at
shutdown.
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Solenoid ValveSolenoid Valve
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Solenoid ValveSolenoid Valve
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Delay at startDelay at start
• The oil pump is set at 100psi or 140psi in most cases.
• This pressure is based upon the burner motor operating the pump at full RPMs.
• There is a brief period at the start of the burner cycle that the motor, pump, and air fan are not moving at full speed.
• Thus, the oil delivered to the combustion chamber would not be at the correct pressure or velocity.
• The oil pump is set at 100psi or 140psi in most cases.
• This pressure is based upon the burner motor operating the pump at full RPMs.
• There is a brief period at the start of the burner cycle that the motor, pump, and air fan are not moving at full speed.
• Thus, the oil delivered to the combustion chamber would not be at the correct pressure or velocity.
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Delay at startDelay at start
• The oil solenoid valve remains closed until the burner motor, the burner fan, and the pump all reach the correct operating speeds.
• The solenoid then opens and allows the correct pressure and air mixtures to occur in the combustion chamber.
• This can also be used as a pre-purge in high efficiency boilers.
• If used as a pre-purge the primary control must be setup for this pre-purge or it will trip.
• The oil solenoid valve remains closed until the burner motor, the burner fan, and the pump all reach the correct operating speeds.
• The solenoid then opens and allows the correct pressure and air mixtures to occur in the combustion chamber.
• This can also be used as a pre-purge in high efficiency boilers.
• If used as a pre-purge the primary control must be setup for this pre-purge or it will trip.
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Delay at startDelay at start
• If you are at a customers oil furnace or boiler and are not able to solve a rough ignition problem through setting of pressures, cleaning, and air adjustment install an oil solenoid valve and the problem will go away.
• If you are at a customers oil furnace or boiler and are not able to solve a rough ignition problem through setting of pressures, cleaning, and air adjustment install an oil solenoid valve and the problem will go away.
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Clean shutoffClean shutoff
• When the call for heat is complete the burner shuts down.
• There is a brief period of time where the pump is not delivering the correct oil pressure to the nozzle.
• The oil will “drip” out of the end of the nozzle and cause a buildup of carbon on the end of the nozzle and in the combustion chamber.
• When the call for heat is complete the burner shuts down.
• There is a brief period of time where the pump is not delivering the correct oil pressure to the nozzle.
• The oil will “drip” out of the end of the nozzle and cause a buildup of carbon on the end of the nozzle and in the combustion chamber.
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Clean shutoffClean shutoff
• The use of the oil solenoid valve causes a clean shutoff. The valve will close at the end of the call for heat and before the pump and burner loose pressure.
• The use of the oil solenoid valve causes a clean shutoff. The valve will close at the end of the call for heat and before the pump and burner loose pressure.
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Mechanical installationMechanical installation
• The oil solenoid valve is placed on the jet line between the oil pump outlet and the nozzle assembly.
• You will need a second ¼” line to complete this installation.
• The oil solenoid valve is placed on the jet line between the oil pump outlet and the nozzle assembly.
• You will need a second ¼” line to complete this installation.
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Electrical InstallationElectrical Installation
• For clean shutoff purposes the oil solenoid valve is wired to the burner motor line from the primary control.
• Do not wire to a the ignition transformer line if separate on the control as the ignition transformer may not be operational through the entire cycle.
• For clean shutoff purposes the oil solenoid valve is wired to the burner motor line from the primary control.
• Do not wire to a the ignition transformer line if separate on the control as the ignition transformer may not be operational through the entire cycle.
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Electrical InstallationElectrical Installation
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Electrical InstallationElectrical Installation
• For a delayed ignition or pre-purge you must either:– Use a primary control that has a separate line for
the solenoid valve.– Use a solenoid valve with an internal delay
timer.
• Make sure you test any installation prior to leaving the job. Run it through several cycles to be sure the delay will not trip the CAD cell safety.
• For a delayed ignition or pre-purge you must either:– Use a primary control that has a separate line for
the solenoid valve.– Use a solenoid valve with an internal delay
timer.
• Make sure you test any installation prior to leaving the job. Run it through several cycles to be sure the delay will not trip the CAD cell safety.
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Electrical InstallationElectrical Installation