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OEM Carrier Transformer 40VA 120V/24V for C50A502762
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A502762

SKU: CARRIE-C50A502762-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A502762 — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V–24V for Model C50A502762

This OEM control transformer is the factory-specified replacement for the Carrier C50A502762 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coils, and control board. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and no heating or cooling stage will energize. It is one of the first components to check when a unit appears completely unresponsive.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part numbers HT01BD236 / HT01BD702 | Factory-matched impedance and thermal overload protection
  • OEM vs Generic: OEM transformers are wound to exact VA and impedance specifications for the C50A502762 control circuit. Undersized or off-spec generic transformers can trip on overload, damage control boards, or produce unstable 24V output that causes intermittent faults.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 24V output after installation before restoring power to the full unit. Always photograph existing wiring before removal.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier C50A502762 commercial packaged rooftop unit. Cross-references OEM part numbers HT01BD236 and HT01BD702. Confirm primary voltage on your unit's data plate prior to ordering. Our parts specialists are available to verify fitment before you buy — no guesswork required.

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 Transformer fit my Carrier C50A502762?
Yes. This is the factory-specified OEM transformer for the Carrier C50A502762. 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 C50A502762?
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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