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5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units
National HVAC Parts

5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units

SKU: NHVAC-HARD-YYJXW1 Brand: National HVAC Parts
$28.00 $37.80

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units

A plug-and-play compressor hard start kit for 1 to 3 ton residential AC and heat pump systems. The most popular size for typical home AC units, this kit gives aging compressors a boost and prevents hard-start failures during the hottest days of summer.

Key Features

  • Covers 1 to 3 ton systems — fits most residential AC units
  • No wiring modifications — 2-wire plug-and-play install
  • Immediately reduces startup time and current draw
  • Prevents compressor burnout from repeated hard starts

Specifications

  • Tonnage: 1 to 3 tons
  • Voltage: 108-132 VAC (single phase)

What's Included

  • Hard start kit
  • Installation instructions

Ships same-day from our Houston warehouse on orders placed before 3PM CST.

Frequently Asked Questions

How do I know what ton my AC is?

Check the data plate on your outdoor unit. The model number often contains a number like 24 (2 ton), 30 (2.5 ton), or 36 (3 ton) — this represents BTU in thousands. Divide by 12 to get tons.

Can I leave this installed permanently?

Yes, hard start kits are designed for permanent installation and should remain on the system for the life of the compressor.

Will this fix my compressor that is not starting?

If your compressor is trying to start (you hear a hum) but trips the breaker or just clicks off, a hard start kit may solve the problem. If the compressor is completely silent, the issue is likely electrical (contactor, capacitor, or wiring).

Is this the same as a start capacitor?

It includes a start capacitor AND a potential relay in one package. The relay automatically disconnects the start capacitor once the compressor reaches running speed.

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 support@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Hard Start Kits & Compressor Accessories fit my National HVAC Parts 5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units?
Yes. This is the factory-specified OEM hard start kits & compressor accessories for the National HVAC Parts 5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units. 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 hard start kits & compressor accessories on my National HVAC Parts 5-2-1 Compressor Saver Hard Start Kit CSR-U1 1 to 3 Ton Units?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new hard start kits & compressor accessories?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this hard start kits & compressor accessories compatible with Bryant or Payne too?
Many National HVAC Parts 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 National HVAC Parts hard start kits & compressor accessories?
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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