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VACUUM SWITCHES Vacuum switches are installed on the inlet line to the pump. They are composed of two parts, the diaphragm, which responds to changes in system pressure, expanding toward its system side when pressure in the system falls below outside or atmospheric pressure, and the electrical switch which is held open by spring tension when there is no pressure differential and the diaphragm is in its normal position. When the pump draws water into the system, the suction causes pressure on the inlet side of the pump to decrease, the diaphragm falls and the vacuum switch contacts close, completing the circuit to the burner system. When flow ceases, the diaphragm rises and a spring helps return the switch to the open position. With the switch open, the circuit to the burner system is broken, the solenoid valve closes, and fuel flow to the burner ceases, stopping burner firing. NOTE: A potential problem with a vac switch can be created when the inlet filter or float tank becomes clogged. The pump will continue to run, creating a pressure drop on the inlet. When this happens, the vac switch will continue to close and start the burner.
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| VACUUM SWITCHES | |
| MODEL | BUY HERE |
| 1.5" HG |
Part# 1404 Our Price: $23.16 |
| 2.5" HG |
Part# 1405 Our Price: $23.16 |
| 4.5" HG |
Part# 3777 Our Price: $23.16 |
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MODEL 35 VACUUM SWITCHES Designed to protect electric motor driven pumps that are being used to move liquids. Install in the suction line of the system. The double pole electrical contacts are wired in series with the driving motor. When liquid is being pumped, the vacuum that exists in the suction side of the system holds the switch contacts closed. When the liquid supply is exhausted, the vacuum is broken and the contacts open, thus stopping the motor and protecting the pumps from dry operation. When the liquid supply is replenished, the motor is started by holding down the switch restart button momentarily. Use pipe or reinforced wall suction hose on the suction side of the pump. A kinked or collapsed hose will not allow the switch to properly protect the pump. Likewise, if the end of the hose is able to suck up against the side or bottom of the tank, the switch will not protect the pump. If a strainer is used, make sure it si kept clean for proper switch protection.
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| MODEL 35 SWITCHES | |
| MODEL | BUY HERE |
| 35.2 1.5" HG |
Part# 2362 Sorry This Item is No Longer Available |
| 35.7 2.5" HG |
Part# 2363 Sorry This Item is No Longer Available |
| 35.X 4.5" HG |
Part# 2364 Our Price: $5.57 |
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