Instruction book
16 9828 0931 61
Description
The condenser pressure must be kept constant to obtain stable operation. Fan control switch (12)
therefore stops and starts the cooling fan (3).
If, under partial or no load, the evaporator pressure drops below a certain level, the hot gas by- pass
valve (9) opens and hot, high-pressure gas is fed to the evaporator circuit to prevent the evaporator
pressure from dropping any further.
2.5 Electrical system
Description
Th
e fan control switch starts the fan motor as soon as the condenser pressure reaches the upper set
point of the switch and will stop the fan motor when the condenser pressure decreases to its lower set
point.
The high pressure shut-down switch stops the compressor motor when the pressure in the refrigerant
circuit reaches the upper setpoint of the switch.
The low pressure shut-down switch stops the compressor motor when the pressure in the refrigerant
circuit drops below the setpoint of the switch.
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