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 Transformer 40VA 120V/24V for C50A302764
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A302764

SKU: CARRIE-C50A302764-TRANSFORMER-HT01BD702 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C50A302764

This OEM replacement transformer (part number HT01BD702) is the factory-specified step-down transformer for the Carrier C50A302764 commercial rooftop unit. The transformer converts 120V line voltage to the 24V signal used by the control board, thermostat, contactor coil, and every other low-voltage component in the system. When the transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and diagnostics become impossible without restoring 24V power first.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 output | Designed to factory OEM tolerances for Carrier commercial rooftop applications
  • OEM vs Generic: This is the genuine OEM Carrier transformer (HT01BD702), wound and rated to exact factory specifications. Generic transformers often carry imprecise VA ratings that cause nuisance tripping, brownout failures, or damage to downstream control boards — always use OEM on commercial equipment.
  • Install difficulty: 2/5 — Turn off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A302764 commercial rooftop packaged unit. Always confirm your unit's control circuit voltage requirements match 120V primary / 24V secondary, 40VA before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us with your model and serial number.

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 $75
  • 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 Transformer fit my Carrier C50A302764?
Yes. This is the factory-specified OEM transformer for the Carrier C50A302764. 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 transformer on my Carrier C50A302764?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.
My thermostat has no power. What failed?
Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.
Is this transformer 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 transformer?
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