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OEM Carrier High Pressure Switch 448#/327# for TFACCY50DK480418
Carrier

OEM Carrier High Pressure Switch 448#/327# for TFACCY50DK480418

SKU: CARRIE-TFACCY50DK480418-PRESSURE_SWITCH-HK02ZA442 Brand: Carrier
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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier High Pressure Switch 448#/327# — HK02ZA442 for Model TFACCY50DK480418

This is the genuine OEM Carrier high pressure switch (part number HK02ZA442), the factory-specified replacement for Carrier model TFACCY50DK480418 packaged and commercial HVAC equipment. The high pressure switch continuously monitors refrigerant circuit pressure on the high side; when pressure exceeds the 448 PSI opening threshold, the switch trips and shuts down the compressor to prevent catastrophic equipment damage. The system re-enables operation once pressure drops back to the 327 PSI closing setpoint. Common failure symptoms include nuisance high-pressure lockouts, compressor short-cycling, or a fault code indicating a high-pressure trip that cannot be reset — all signs this switch may have drifted out of calibration or failed outright.

  • Specs: Opening pressure: 448# (PSI) | Closing pressure: 327# (PSI) | Voltage: 240V | OEM Part #: HK02ZA442 | Replaces: HK02ZA439
  • OEM vs Generic: This is a genuine Carrier Factory Authorized Part, precision-calibrated to exact setpoints. Off-brand alternatives often use looser pressure tolerances that can allow over-pressure events to go undetected, risking compressor failure and voiding system warranties.
  • Install difficulty: 3/5 — Requires proper refrigerant circuit safety procedures. Recover system refrigerant before disconnecting the switch. Tools needed: manifold gauge set, flare-nut wrenches, multimeter for continuity verification. Always confirm pressure setpoints match your unit's data plate before installation.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM drop-in replacement for Carrier model TFACCY50DK480418. Always verify the opening/closing pressure ratings on your unit's data plate or service manual before ordering to confirm this switch matches your application. Have a question about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and get your system back up and running 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 TFACCY50DK480418?
Yes. This is the factory-specified OEM pressure switch for the Carrier TFACCY50DK480418. 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 TFACCY50DK480418?
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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Mike Rivera
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