Aaon R37200 Fan Cycle Switch

The Aaon R37200 Fan Cycle Switch is a critical pressure-actuated control designed for maintaining optimal head pressure in R410A refrigerant systems. This high-pressure switch, cross-referenced as HS300-28-0034, features a factory-calibrated setpoint of 320/475 PSI. Specifically engineered for air-cooled condensers and commercial HVAC units, it cycles the condenser fan to stabilize system pressures during low ambient conditions. By managing the condenser fan cycle, this switch prevents evaporator freeze-ups and ensures efficient compressor operation across varying thermal loads. The rugged construction resists vibration and environmental wear, making it a standard replacement for Aaon rooftop units and chillers. Whether you are performing a service repair or a system overhaul, utilizing this HVAC pressure control ensures the unit maintains the specific subcooling and head pressure parameters required for peak efficiency and component protection.

Technical Benefits & Key Features

• Precise Pressure Modulation: Calibrated for a 320 PSI cut-in and 475 PSI cut-out to maintain stable head pressure.
• OEM Compatibility: Direct replacement for Aaon OEM parts and alternate part number HS300-28-0034.
• Optimized for R410A: Designed to withstand the higher operating pressures characteristic of R410A refrigeration systems.
• Enhanced System Reliability: Regulates fan operation to protect the compressor and improve overall cycle efficiency.
• Field-Proven Durability: Built to meet industrial specifications for long-term placement in demanding condenser environments.

Common Questions

What are the specific setpoints for the Aaon R37200?
This switch is rated for 320/475 PSI, making it ideal for high-pressure R410A fan cycling applications where precise head pressure control is necessary.

Can this switch be used in low ambient kits?
Yes, the Aaon R37200 is frequently used in low ambient fan cycling setups to ensure the system operates correctly when outdoor temperatures drop by maintaining sufficient head pressure.

Is this switch compatible with other refrigerants like R22?
No, this model is specifically calibrated for the pressure curves of R410A systems. Using it with R22 may lead to improper fan cycling and potential system damage due to incorrect pressure thresholds.

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.