Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier High Pressure Switch 448#OPN 327#CLS — TFACCY50DK480311
Carrier

OEM Carrier High Pressure Switch 448#OPN 327#CLS — TFACCY50DK480311

SKU: CARRIE-TFACCY50DK480311-PRESSURE_SWITCH-HK02ZA442 Brand: Carrier
✓ Guaranteed to fit TFACCY50DK480311 — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier High Pressure Switch 448#OPN / 327#CLS for Model TFACCY50DK480311

This is the genuine OEM factory-replacement high pressure switch for the Carrier TFACCY50DK480311 commercial packaged/rooftop unit. The high pressure switch (HK02ZA442) is a critical refrigerant-side safety device that monitors refrigerant circuit pressure and opens the circuit when pressure exceeds the safe threshold — protecting the compressor from catastrophic damage. When this switch fails or trips due to age, vibration, or refrigerant overcharge, you'll typically experience nuisance high-pressure lockouts, compressor short-cycling, or a system that trips on manual reset repeatedly without an apparent refrigerant-side fault. A second OEM switch, HK02ZB044, serves as the low pressure switch on this platform (7#OPN / 22#CLS, 50" leads) and is also stocked for this model.

  • Specs (HK02ZA442 — High Pressure Switch): 448 PSI opening pressure | 327 PSI closing pressure | OEM factory-matched setpoints | Replaces HK02ZA439
  • Specs (HK02ZB044 — Low Pressure Switch): 7 PSI opening pressure | 22 PSI closing pressure | 50" leads | 24V | Country of Origin: Mexico
  • OEM vs Generic: Genuine Carrier OEM switches are calibrated to exact factory pressure setpoints (±tolerance), ensuring no nuisance trips and full compressor protection. Aftermarket switches often drift from spec, risking either unprotected operation or false lockouts.
  • Install Difficulty: 3/5 — Requires refrigerant-side work. Always recover refrigerant per EPA Section 608 before replacing. Tools needed: manifold gauges, refrigerant recovery unit, 1/4" flare fittings, multimeter. Verify system pressures are within normal range before condemning the switch.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the direct OEM replacement for Carrier TFACCY50DK480311. Both OEM part numbers — HK02ZA442 (high pressure, primary) and HK02ZB044 (low pressure, secondary) — are in stock. Always verify pressure setpoints on your unit's data plate and wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and we'll ship your order out 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 — TFACCY50DK480311?
Yes. This is the factory-specified OEM pressure switch for the Carrier OEM Carrier High Pressure Switch 448#OPN 327#CLS — TFACCY50DK480311. 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 — TFACCY50DK480311?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online