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OEM Carrier Transformer 40VA 120V/24V for C50A502052
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A502052

SKU: CARRIE-C50A502052-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C50A502052

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C50A502052 commercial rooftop unit. The transformer steps down line voltage (120V) to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching components. When the transformer fails, the entire control circuit goes dark — your thermostat goes blank, contactors won't energize, and the system will not respond to any calls for heating or cooling.

  • Specs: 40VA output rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched for Carrier C50A502052 rooftop units
  • OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers often underperform at rated load, causing nuisance tripping of the secondary fuse and erratic control board behavior — stick with OEM to protect downstream components.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Always verify 24V output before reconnecting the control circuit. Confirm the secondary fuse or circuit breaker is intact before condemning the transformer.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A502052 commercial packaged rooftop unit. Verify the 40VA rating and 120V/24V configuration on your unit's data plate before ordering. If your unit runs a 208/240V primary, do not order this part — contact our team for the correct variant. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.

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 C50A502052?
Yes. This is the factory-specified OEM transformer for the Carrier C50A502052. 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 C50A502052?
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
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