Which of the following is NOT a function of the pressure cycling switch on a fixed displacement orifice tube air conditioning system?

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Multiple Choice

Which of the following is NOT a function of the pressure cycling switch on a fixed displacement orifice tube air conditioning system?

The pressure cycling switch in a fixed-displacement orifice-tube A/C system uses suction (low-side) pressure to control the compressor. It turns the compressor on when suction pressure climbs above a lower threshold and turns it off when it drops below a set point. This cycling helps maintain evaporator temperature and prevents conditions like evaporator icing, while also providing protection if the refrigerant charge is low (low suction pressure). Activating the condenser fan is not a function of this switch. The condenser fan is typically controlled by a separate high-side pressure switch or a cooling fan control module, responding to heat load on the condenser. So the option describing activating the condenser fan is not something the pressure cycling switch does.

The pressure cycling switch in a fixed-displacement orifice-tube A/C system uses suction (low-side) pressure to control the compressor. It turns the compressor on when suction pressure climbs above a lower threshold and turns it off when it drops below a set point. This cycling helps maintain evaporator temperature and prevents conditions like evaporator icing, while also providing protection if the refrigerant charge is low (low suction pressure).

Activating the condenser fan is not a function of this switch. The condenser fan is typically controlled by a separate high-side pressure switch or a cooling fan control module, responding to heat load on the condenser. So the option describing activating the condenser fan is not something the pressure cycling switch does.

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