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OEM Carrier Transformer 40VA 120V/24V for C50A202764
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A202764

SKU: CARRIE-C50A202764-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C50A202764

This OEM step-down transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C50A202764 packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, absolutely nothing responds: the thermostat goes blank, no calls for heat or cooling are processed, and the system appears completely dead despite line voltage being present at the unit.

  • Specs: 40VA capacity | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01BD702 | Factory-matched output tolerance for stable control voltage
  • OEM vs Generic: OEM transformers maintain tight secondary voltage regulation under varying load conditions. Off-brand units frequently deliver unstable 24V output, causing erratic board behavior, nuisance lockouts, and premature failure of downstream components like contactors and gas valves.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify with a multimeter before handling. Tools needed: flathead and Phillips screwdriver, wire stripper, multimeter. Label and photograph all low-voltage wiring connections before removal. Secure all wire nuts firmly after reinstallation.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier C50A202764 commercial packaged rooftop unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. If your unit runs a 208/240V primary, a different transformer part number is required — contact our team for fitment verification before purchasing.

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 C50A202764?
Yes. This is the factory-specified OEM transformer for the Carrier C50A202764. 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 C50A202764?
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.
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Mike Rivera
HVAC Parts Specialist — Online