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OEM Carrier High Pressure Switch 448#OPN 327#CLS — PY1RPA048074AAWB
Carrier

OEM Carrier High Pressure Switch 448#OPN 327#CLS — PY1RPA048074AAWB

SKU: CARRIE-PY1RPA048074AAWB-PRESSURE_SWITCH-HK02ZA442 Brand: Carrier
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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier High Pressure Switch 448#OPN / 327#CLS for Model PY1RPA048074AAWB

This is the genuine OEM Carrier high pressure switch (part number HK02ZA442) factory-specified for the Carrier PY1RPA048074AAWB packaged unit. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors refrigerant discharge pressure and opens the circuit to shut down the compressor if pressure exceeds the trip point. When it fails or trips, you'll typically see nuisance high-pressure lockouts, compressor short-cycling, or a system that won't run at all even when refrigerant charge and airflow are verified normal. This listing also includes the companion low pressure switch HK02ZB044 (7#OPN / 22#CLS, 50" leads), which protects the low side of the refrigerant circuit — together these two switches provide complete factory refrigerant-circuit pressure protection for the PY1RPA048074AAWB.

  • Specs (HK02ZA442 — High Pressure Switch): Opening pressure: 448 PSI | Closing pressure: 327 PSI | OEM part replaces HK02ZA439 | Made in Mexico | Factory-matched trip tolerances for reliable compressor protection
  • Specs (HK02ZB044 — Low Pressure Switch): Opening pressure: 7 PSI | Closing pressure: 22 PSI | 50" lead wire | 24V control circuit | OEM Carrier/Bryant/Payne genuine part
  • OEM vs Generic: OEM pressure switches are calibrated to exact factory trip points. Aftermarket units frequently deviate from rated open/close pressures, allowing unsafe operating conditions that shorten compressor life or create refrigerant circuit damage.
  • Install difficulty: 3/5 — Refrigerant circuit work requires EPA 608 certification. Discharge system pressure before disconnecting. Tools needed: manifold gauge set, 1/4" nut driver, needle-nose pliers, multimeter. Photograph wiring before removal. Always verify system charge and airflow before condemning pressure switches.
  • Warranty: 1-year OEM factory warranty on both switches. Orders placed by 3PM ship same business day from our warehouse.

Compatibility: These switches are the factory-specified OEM replacements for the Carrier PY1RPA048074AAWB packaged unit. Verify part numbers against your unit's wiring diagram and data plate before ordering. Not sure about fitment? Our HVAC parts specialists will confirm compatibility before you buy — contact us today and get your system back online fast.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $99
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Pressure Switch fit my Carrier OEM Carrier High Pressure Switch 448#OPN 327#CLS — PY1RPA048074AAWB?
Yes. This is the factory-specified OEM pressure switch for the Carrier OEM Carrier High Pressure Switch 448#OPN 327#CLS — PY1RPA048074AAWB. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the pressure switch on my Carrier OEM Carrier High Pressure Switch 448#OPN 327#CLS — PY1RPA048074AAWB?
Difficulty: Medium (20–30 min)
Step 1: Turn off power. Step 2: Locate pressure switch near draft inducer. Step 3: Note tubing orientation. Step 4: Disconnect tubing and wires. Step 5: Remove screw, install new switch. Step 6: Reconnect tubing and wires, restore power.
My furnace shows a pressure switch error. What do I replace?
Furnace LED showing pressure switch error = switch not detecting draft inducer airflow. Try first: clear the rubber tubing to the switch (often clogged with condensation). If problem persists, replace the pressure switch.
Is this pressure switch compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier pressure switch?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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