Daikin-McQuay 349956814 Pressure Control

The Daikin-McQuay 349956814 is a precision-engineered Lo Limit Pressure Control designed for high-performance HVAC systems. Calibrated specifically for a 0.15" WC setpoint, this differential pressure switch monitors critical airflow and static pressure thresholds to prevent equipment damage. As a genuine OEM Daikin replacement part, it ensures seamless integration with McQuay air handlers and rooftop units. Its primary function is to serve as a safety limit switch, detecting low-pressure conditions that could indicate filter blockages, belt failures, or blower malfunctions. Built with industrial-grade internals, this low pressure cutout provides reliable electrical switching when the system deviates from its specified operating parameters. For contractors, installing this HVAC pressure sensor ensures system longevity and maintains the integrity of the original equipment engineering, providing a robust solution for commercial climate control maintenance and repair.

• Precise 0.15" WC Calibration: Ensures accurate detection of low static pressure, protecting the compressor and evaporator coils from adverse operating conditions.
• OEM Compatibility: Exact replacement for Daikin-McQuay 349956814, eliminating field modification issues and ensuring proper mounting and wiring alignment.
• Durable Construction: Engineered to withstand the rigors of mechanical rooms and rooftop environments, offering consistent switching cycles over time.
• Enhanced System Safety: Acts as a critical fail-safe, preventing the system from operating under low-flow conditions that lead to icing or thermal overload.

How do I verify if this pressure control is compatible with my McQuay unit?
Confirm the part number against your unit’s data plate or technical manual. The 349956814 is a specific 0.15" WC low limit switch used primarily in Daikin and McQuay air handling systems.

Can this switch be used for both positive and negative pressure applications?
This low limit control is typically used to sense a drop in pressure across a component. Refer to the specific port markings on the housing to ensure correct tap orientation for your differential pressure requirements.

What are the electrical ratings for the contacts on this control?
This switch is designed for low-voltage control circuits. Always verify that your system’s amp draw and voltage do not exceed the specific contact ratings stamped on the side of the 349956814 housing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.