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2.13.
Pump
The pump of the chiller provides for the necessary circulation of the cold water.
2.14.
Fan
The fan draws in the cooling air from the environment via the condenser and discharges the heated air
upward from the chiller. To prevent injuries, the fan is protected against accidental contact by protective
grilles. The fan's speed is variable and is regulated from the main circuit board. The speed of the fan is
essentially determined by the condensing pressure. The fan is protected against thermal overload. In units
with two fans the speed of fan1 is always the same as the speed of fan2.
2.15.
Closed cold water circuit
Cold water is conveyed through the process circuit by means of the internal pump. In the process circuit, the
cold water absorbs heat. The circuit closes when the cold water is conveyed back into the chiller. It goes
through the evaporator in which is discharges the heat. Then the cycle starts again.
Furthermore, the closed system is designed with a membrane expansion vessel that is under a certain initial
pressure depending on the system volume. The membrane expansion vessels balances out the temperature
fluctuations and the associated system pressure in the cold water circuit. If the water pressure increases,
the membrane expansion vessel absorbs the expansion volume of the water. If the water temperature
decreases, the membrane expansion vessel takes the expansion water back to the cold water circuit.
