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Condensate returns flowing into receiver. Pump is controlled by water level switch on the boiler. Water is pumped to boiler. The solenoid valve is closed; pipe into solenoid is always filled with makeup city water.
The water level in receiver tank begins to fall as it is pumped to the boiler.
If volume of water pumped to boiler exceeds volume of condensate returns, the water level will continue to drop. A low water level float switch sends signal to open the solenoid valve letting makeup city water flow into receiver.
The colder city water, along with condensate return cause the water temperature in the receiver to fall.
When the temperature drops (for example, to 180°F), the regulator valve releases steam into the tank through a submerged preheat tube to heat water.
The steam regulator includes a pressure reducing valve that ensures the steam pressure released into the submerged preheat tube does not exceed 5-7 psig.
The combined condensate return and makeup city water cause the water level to rise.
At the high water level setting, the float switch signals solenoid valve to close.
The temperature in the receiver rises back to normal.
The temperature sensor signals the regulator valve to discontinue venting steam into the receiver.