HIGH PRESSURE (HP) SWITCH

High-Pressure Switch in an HVAC System

High-pressure switches serve as vital safety components within HVAC systems. True to their name, these switches are designed to monitor refrigerant pressure levels, typically installed on the liquid line. They continuously assess the refrigerant levels, and if the pressure goes above the acceptable operating range, they quickly detect this and send a signal to the control panel, prompting the HVAC system to stop.

The choice of a high-pressure (HP) switch depends on the specific refrigerant being utilized, as each type has distinct operational pressure requirements.

Standard HP Switch Settings for Common Refrigerants:

• R22: Ranges from 350 psi to 400 psi
• R134a: Ranges from 280 psi to 320 psi
• R410A: Ranges from 450 psi to 610 psi
• R32: Typically between 450 psi and 610 psi

For precise pressure settings related to refrigerants like R407 and R404, it is crucial to refer to the manufacturer’s specifications.