A pressure switch has two main functions: protection and control. On the protective side, it limits refrigeration pressure by stopping the flow of refrigerant if pressures exceed a safe operating limit or if pressures drop too low, usually caused by a leak in the system.

• Convertible feature allows selection of manual or reset function when operating at high pressure (O124833/O12-4834)
• A wide range of high-pressure manual or automatic reset controls can be replaced (O12-4833 or O124834)
• A high-pressure limit is combined with suction pressure sensing to provide temperature control and/or pump down
• High-limit adjustment screw
• Low-pressure differential and range adjusting screws
• Selector screw for manual or automatic
• Reset button
• Low-pressure scale plate
• High-impact plastic cover with center mount screw
• High-pressure scale plate
• Color-coded for easy identification of pressure line
• High-side capillary flare nut (silver)
• Low-side capillary flare nut (brass)