A pressure switch that contains both a high and a low switch is called a:

A pressure switch that contains both a high and a low switch is called a:

• A. Single-pressure switch.
• B. Three-position switch.
• C. Dual-pressure switch.
• D. Multi-pressure switch.

Answer: (C)

A device that includes both a high-pressure and a low-pressure threshold is described as a dual-pressure switch. The two setpoints let the system respond to two different conditions: one that shuts the compressor if discharge pressure gets too high, and another that shuts it down if suction pressure falls too low. This provides protection for both the compressor and the refrigerant circuit, covering both overpressure and underpressure scenarios. The other terms don’t fit as well. A single-pressure switch only has one threshold, so it can’t protect against either high or low pressure, only one condition. A three-position switch implies three states rather than two pressure thresholds. A multi- pressure switch isn’t the standard HVAC term for this configuration.

A device that includes both a high-pressure and a low-pressure threshold is described as a dual-pressure switch. The two setpoints let the system respond to two different conditions: one that shuts the compressor if discharge pressure gets too high, and another that shuts it down if suction pressure falls too low. This provides protection for both the compressor and the refrigerant circuit, covering both overpressure and underpressure scenarios.

The other terms don’t fit as well. A single-pressure switch only has one threshold, so it can’t protect against either high or low pressure, only one condition. A three-position switch implies three states rather than two pressure thresholds. A multi- pressure switch isn’t the standard HVAC term for this configuration.