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Gravity condensate returns flow into condensate receiver (bottom tank). Both the air pump and water pump are OFF. Two things to note:
The water level in the condensate receiver rises causing the float to rise.
The level of the vacuum in the condensate return is measured by the vacuum switch via the sensing line. The vacuum switch detects a decrease of vacuum in the return line and sends signal to turn ON the air pump when vacuum level falls below preset conditions.
At HIGH water level setting, float switch in the condensate receiver sends signal to turn ON the water pump, which then pumps water to the system.
Water in hurling chamber flows into suction of the air pump. The air pump forces water from the bottom of the hurling chamber up through the multi-jet nozzle. The water, under pressure, breaks into several high velocity streams. As the streams pass by the air gap between the multi-jet nozzle and the venturi, they entrain (pull) air and gases from the condensate receiver creating a mixture of water, air and gases.
As the mixture enters the venturi, it converges creating a steady vacuum at the air gap. The velocity of the mixture also slows as the diameter of the venturi widens. The mixture is then discharged through the venturi tangentially into the hurling chamber -- creating a centrifugal action that forces water to the periphery (outer edges) of the chamber, while the air and gases separate from the water. This centrifugal motion also increases the pressure at the suction of the air pump, promoting high efficiency.
As the water passes the air gap, the air suction created pulls open the "swing" check valve, drawing air and gases up from the condensate receiver into the hurling chamber. Air, gases and water vapor escape from a vent at the top of the hurling chamber.
Due to evaporation over a period of days, the water level in the hurling chamber gradually drops. The hurling chamber float switch detects the water level drop.
The hurling chamber float switch sends signal to OPEN the hurling make-up valve, releasing city water into the hurling chamber.
As water is being pumped out, the water level in the condensate receiver drops.
Once the water level in the condensate receiver drops, the condensate float switch detects the drop and signals to turn OFF the water pump.
The flow of make-up water restores the water level in the hurling chamber back to normal. The hurling chamber float switch detects the water level rises.
The hurling chamber float switch detects the rise in water level and sends signal to CLOSE the hurling make-up valve.
The vacuum sensing line detects the vacuum level in the condensate return line meets the preset conditions. The vacuum switch sends signal to turn OFF the air pump. When the air pump stops, the flow of water through air gap stops. This causes the check valve to close, preventing the return of air or water to condensate receiver. The vacuum gradually degrades due to leaks within the return system lines.