Daikin-McQuay 047357603 Pressure Control Switch SPST-NC 8-40 PSI 24V

The Daikin-McQuay 047357603 is an OEM pressure control switch designed for use in Daikin-McQuay commercial HVAC systems. It features a Single Pole, Single Throw, Normally Closed (SPST-NC) configuration and operates across a pressure range of 8 to 40 PSI at 24 volts, making it well-suited for low-pressure monitoring and safety shutoff applications in air handling, chiller, and rooftop HVAC equipment.

As a normally closed pressure switch, this control remains in a closed (energized) circuit state under normal operating conditions and opens the circuit when system pressure rises to the set point. This behavior is commonly used for low-pressure safety cutout or proof-of-flow applications where loss of pressure must trigger a protective response.

Key Specifications:

• Manufacturer Part Number (MPN): 047357603
• Switch Type: SPST-NC (Single Pole, Single Throw, Normally Closed)
• Pressure Range: 8–40 PSI
• Operating Voltage: 24V
• Application: Commercial HVAC pressure control and safety switching
• OEM Replacement: Direct factory replacement for compatible Daikin-McQuay equipment

This pressure control switch is an essential safety and operational component, protecting compressors and system components from low-pressure conditions. It is a direct OEM replacement part, ensuring compatibility with factory control circuits and original equipment specifications.