Carrier HK02ZB421 Pressure Switch

The Carrier HK02ZB421 Pressure Switch is a critical safety component designed for R-410A refrigerant residential and commercial air conditioning systems. This heavy-duty high pressure switch features a normally closed SPST (Single Pole Single Throw) configuration and is factory-calibrated to open at 610 PSI to prevent compressor damage during over-pressurization. Once system pressure stabilizes, the switch initiates a manual reset or automatic close at 420 PSI, ensuring the equipment remains within safe operating parameters. As a genuine OEM replacement part, the HK02ZB421 serves as a direct drop-in for legacy ICP 326164-701 components across Carrier, Bryant, and Payne units. Its rugged construction minimizes false tripping, maintaining system integrity in high-demand environments. For technicians servicing split systems or heat pumps, this 610/420# pressure control provides the precise monitoring required to meet original manufacture specifications and protect expensive scrolls and reciprocating compressors from catastrophic failure.

Key Benefits:

• Precise Pressure Control: Pre-set 610 PSI cut-out and 420 PSI cut-in points provide reliable protection against high-side pressure spikes.
• OEM Compatibility: Designed specifically for Carrier, Bryant, and Payne models, ensuring exact fitment and electrical alignment.
• R-410A Optimized: Engineered to handle the higher operating pressures associated with modern R-410A air conditioners.
• Durable Construction: Built to withstand rigors of field use, reducing callbacks caused by sensitive or inaccurate safety switches.

Common Questions:

• What are the exact trip points for this switch? The HK02ZB421 is calibrated to open the circuit at 610 PSI and close it once pressure drops back to 420 PSI.
• Is this an equivalent for ICP 326164-701? Yes, this is the current factory-authorized replacement for that older part number.
• Is any special tools required for installation? This switch typically uses a standard refrigerant flare or threaded connection for a fast, leak-free installation on the liquid or discharge line.

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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.