Carrier HK02SB020 Pressure Switch

The Carrier HK02SB020 is a high-precision low pressure switch designed for critical monitoring within commercial and residential HVACR systems. As a Factory Authorized Part, this single-pole single-throw (SPST) snap-acting switch is engineered to identify drops in refrigerant pressure, effectively protecting the compressor from operating under hazardous low-suction conditions. It features a factory-calibrated setpoint of 8.4 bar (approx. 121 PSI) and is rated for 240VAC at 6 Amps, ensuring robust electrical performance in demanding environments. This OEM replacement pressure switch is constructed with free-movement contacts that offer superior resistance to high-frequency vibration and mechanical shock commonly found in Carrier, Bryant, and Payne condensing units. With a compact 0.75-inch width and 36-inch lead length, it allows for straightforward integration into existing control circuits, maintaining the CSA-listed safety standards required for professional refrigeration and air conditioning maintenance.

• OEM Compatibility: Precision-engineered for a seamless fit in Carrier HK02SB020 applications, including the 48HCDA and 48HCED series.
• System Protection: Rapidly detects low refrigerant pressure to prevent compressor burnout and evaporator coil icing.
• Durable Construction: Snap-acting SPST contacts provide clean electrical breaks and extended cycle life under thermal stress.
• Environmental Resilience: Rated for operation between -30°C and 80°C, making it suitable for year-round outdoor HVAC infrastructure.

How do I troubleshoot a pressure switch error code on a Carrier unit?
Verify 24V power at the switch terminals and check the induction tubing for clogs or cracks. If the switch remains open while the system is under proper pressure, the internal diaphragm or snap-acting contacts may have failed.

Is the HK02SB020 an adjustable or fixed pressure switch?
This specific Carrier low pressure switch is factory-set to 8.4 bar to meet precise manufacturer specifications for system safety and refrigerant flow control.

Can this switch be used in both furnace and AC applications?
The HK02SB020 is primarily utilized in the cooling circuit to monitor refrigerant levels, though it functions within the broader 24V control logic of Carrier HVAC systems.

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.