OEM Carrier High Pressure Switch HK02ZA395 — 395/295 PSI for Model PY2PNB048090AA

This genuine OEM Carrier high pressure switch (part number HK02ZA395) is the factory-specified refrigerant safety switch for the Carrier PY2PNB048090AA packaged unit. The high pressure switch continuously monitors refrigerant discharge pressure and opens the safety circuit if pressure exceeds the rated cutout threshold — protecting the compressor from catastrophic over-pressure damage. When this switch fails or trips, the system may shut down on lockout, display a high-pressure fault code, or fail to maintain cooling, even when refrigerant charge and airflow appear normal.

• Specs: Opens at 395 PSI | Closes at 295 PSI | 1/8" NPT male thread connection | 240 VAC rated | SPST normally closed | Sensata PS80-03-0018 platform | Pmax 41 bar
• OEM vs Generic: This is a genuine Carrier OEM switch manufactured to exact factory pressure setpoints (±2%). Aftermarket alternatives frequently carry wider pressure tolerances, risking either nuisance trips or, worse, failure to protect the compressor at true over-pressure conditions.
• Install difficulty: 2/5 — Recover all refrigerant before replacing this switch. Tools required: refrigerant recovery machine, manifold gauges, adjustable wrench, and leak-detection solution. Always verify system pressure after reinstallation before recharging. Recommended for licensed HVAC technicians only due to refrigerant handling requirements.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty. In stock and ships same business day from our warehouse. Replaces legacy part numbers: 312926-217, 71267D1, HK02ZA380, HK02ZA396, HK02ZA400, HK02ZA401.

Compatibility: Designed as a direct OEM replacement for the Carrier PY2PNB048090AA packaged unit (4-ton, 90,000 BTU gas/electric). Verify the 395/295 PSI pressure rating on your unit's existing switch label before ordering. Have a fitment question? Our HVAC parts specialists are standing by — we verify compatibility before you order.