McQuay Daikin 735001628 Switch

The McQuay Daikin 735001628 Mechanical Low Pressure Switch is a critical safety component engineered for precision monitoring in commercial HVAC refrigeration systems and centrifugal chillers. This OEM replacement part is specifically designed to protect the compressor by detecting low refrigerant levels or suction side restrictions that could lead to evaporator coil freezing or total system failure. Built with a robust NEMA 1 enclosure, this switch is rated for operation in environments ranging from -40°F to 180°F, making it a reliable choice for process control equipment and heavy-duty industrial pressure monitoring.

As a veteran tech, you know that keeping the suction side within spec is non-negotiable for system longevity. The 735001628 features adjustable pressure settings, allowing for field-tuning to meet specific HVAC low pressure cut-out requirements, typically triggering between 20 to 30 psi to signal the control board for safe shutdown. Its 2-wire electrical connection ensures straightforward integration into existing control circuits, providing an essential fail-safe against refrigerant leaks and blocked airflow in high-performance Daikin-McQuay units.

• System Protection: Effectively prevents compressor damage caused by low refrigerant charge or liquid line restrictions.
• Industrial Durability: Features a NEMA 1 rated enclosure for reliable performance in harsh mechanical rooms.
• Precision Control: Utilizing adjustable pressure settings allows for exact calibration based on specific HVACR system requirements.
• Extreme Temperature Resilience: Engineered to maintain accuracy across an operating temperature range of -40°F to 180°F.
• Authentic OEM Quality: A genuine Daikin-McQuay replacement part ensuring full compatibility with existing chiller and air handler logic.

What causes this low pressure switch to trip during operation?
Common triggers include refrigerant leakage, a faulty blower motor in the air handler, or restricted airflow due to a blocked evaporator coil. When the pressure drops below the setpoint, the switch opens the circuit to protect the compressor.

Is the 735001628 compatible with non-HVAC systems?
Yes, its robust mechanical switch design makes it suitable for various industrial applications, including air compressors, hydraulic systems, and vacuum process control equipment.

How do I reset the system after a low-pressure trip?
This is typically an automatic reset switch that re-engages once suction pressure returns to normal levels. However, the root cause—such as a leak or restriction—must be addressed by a technician to prevent repeated cycling.

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.