Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.
Verified Customer
4.9/5 based on 4750 reviews
Compressor Saver Hard Start Assist Kit | For 3.5 - 5 Ton Compressors
Compressor Saver Hard Start Assist Kit | For 3.5 - 5 Ton Compressors
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Specifications
Specifications
description
description
5-2-1 Compressor Saver CSRU2 Hard Start Kit | 3.5 - 5 Ton HVAC Units | OEM 3-Wire Potential Relay
The 5-2-1 Compressor Saver CSRU2 is the industry-standard "insurance policy" for high-performance air conditioning systems. Specifically engineered for 3.5 to 5-ton condensing units, this hard start device acts as a high-torque booster for your compressor's "brain" during the most critical stage: startup. By utilizing a heavy-duty start capacitor and a precision Potential Relay, the CSRU2 reduces the duration of high-amp inrush current by up to 50%. This significantly lowers heat buildup within the compressor windings, preventing premature failure and helping older systems overcome "stuck" or hard-starting conditions.
Key Features
- True 3-Wire Technology: Unlike cheap 2-wire "PTC" boosters, the CSRU2 uses a 3-wire connection to accurately sense when the motor has started, safely disconnecting the capacitor in milliseconds.
- Extends Compressor Life: Dramatically reduces the "inrush current" (LRA) that causes internal heat damage and light flickering during AC startup.
- OEM Reliability: Features a genuine high-quality potential relay and a heavy-duty start capacitor, the same technology used by manufacturers in premium high-efficiency units.
- Wide Compatibility: Designed specifically for large-scale residential and light commercial systems ranging from 3-1/2 to 5 Tons.
- Safety Focused: Protects your expensive compressor from the stress of low-voltage brownouts and high-head pressure starts during extreme summer heat.
Product Details
- Brand: 5-2-1® Compressor Saver®
- Manufacturer: CPS Products
- Part Number: CSRU2
- System Tonnage: 3.5, 4.0, and 5.0 Ton Units
- Voltage: 204V - 240V (Single Phase)
- Relay Type: Potential Relay (Non-Electronic)
- Capacitor Type: High-Microfarad Start Capacitor
- Wiring: 3-Wire (Black, Red, Striped)
🛠️ HVAC Depot Pro Tip
The 5-2-1 kit is superior to 2-wire kits because it doesn't stay in the circuit too long. When installing, follow the "5-2-1" rule for the relay terminals: Terminal 5 goes to Common, Terminal 2 goes to Start, and Terminal 1 goes to the Capacitor. Always secure the kit vertically within the electrical cabinet using the provided mounting screw to prevent vibration damage to the internal relay mechanism.
Cross-Reference
- Replaces/Supersedes: Generic 2-Wire Hard Starts (SPP6, HS600, etc.)
- Legacy/Drawing Numbers: CSRU-2, 521-CSRU2
- Equivalent Brands: Kickstart TO-5, Rectorseal KS-1, Supco SPP8E (Electronic equivalent)
Model Compatibility
- Universal: 3.5 - 5 Ton Systems
- Carrier / Bryant / Payne: (Suffixes: 38, 48, 50 Series)
- Trane / American Standard: (Suffixes: XR13, XR14, XR15, XV)
- Rheem / Ruud: (Suffixes: RA13, RA14, RP14, RP15)
- Goodman / Amana: (Suffixes: GSX, GSZ, ASZ, ASX)
- Lennox / Armstrong: (Suffixes: 13ACX, 14ACX, XC Series)
Specification
Specification
Refund policy
Refund policy
Refund & Return Policy
Last Updated: June 2026
At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.
Return Eligibility
We accept returns within 30 days of delivery.
To qualify for a return:
- The item must be unused, uninstalled, and in its original condition.
- The item must be returned in its original packaging.
- Model numbers and serial numbers must match the original purchase records.
- Proof of purchase or order confirmation is required.
Non-Returnable Items
The following items are not eligible for return or refund:
- Installed or used parts.
- Products showing signs of installation, modification, or damage caused after delivery.
- Items missing original packaging.
- Sale or clearance items.
- Special-order or custom-order products.
- Returns requested more than 30 days after delivery.
Restocking Fee
Approved returns may be subject to a 20% restocking fee.
The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.
Damaged, Defective, or Incorrect Items
If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.
Email: support@tophvacparts.com
Phone: (214) 734-5222
We may request photographs and additional information to help process your claim.
If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.
Exchanges
We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.
To request an exchange, contact us at:
Refund Process
Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.
If approved:
- Refunds will be issued to the original payment method.
- Processing typically takes 7–14 business days after approval.
- Your financial institution may require additional time before the refund appears in your account.
Return Shipping
Customers are responsible for return shipping costs unless the return is the result of:
- Our shipping error,
- A defective product,
- A damaged product received upon delivery.
Original shipping charges are non-refundable.
We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.
Return Address
HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States
Professional Installation Notice
Many HVAC products require installation by a licensed HVAC professional.
HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.
Special Orders
Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.
Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.
Contact Us
If you have questions regarding returns, refunds, or exchanges, please contact us:
HVAC Parts & Equipment Depot
Phone: (214) 734-5222
Email: support@tophvacparts.com
Verified Customer
Happy Shouts From Our Thrilled Customers
William Bartlett
Cecil really saved me with troubleshooting tips over the phone. Thought I was going to have to replace the blower motor and ended up only needing a motor run capcitor. Thank you and God bless!
Verified Buyer
Riley Connolly
Cecil and Fidel were absolutely amazing and so helpful. We were happy they were open on Sunday, but was impressed with their knowledge and willingness to make sure we had everything we needed. If you need parts or service or install, I would recommend.
Verified Buyer
Cole Meger
Our AC went out during the hottest stretch of summer, and with a one-year-old at home, we were desperate for a quick fix. These guys came through big time — not only did they source the part faster than anyone else in the area, they also walked me through DIY troubleshooting while I waited. Trustworthy, knowledgeable, and run by a solid local family. As someone who owns rental properties nearby, I’ll be sourcing all my HVAC parts from them moving forward. Highly recommend!
Verified Buyer
Carl T. Droste
Had a power outage last night and during the 100 degree heat today noticed that the AC was not blowing any cold air. Pulled the capacitors to have them checked and also took video of the relay making noise even with the breaker was off. The proprietor and her staff were very friendly and helpful. She had the video analyzed and confirmed something was wrong. She checked one of the capacitors was a little low. Capacitor replacement is the biggest ticket item for HVAC repair. It is hundreds of dollars with the a capacitor only about $20.
Verified Buyer
Fuzzy Wuzzy
Cecil and his family have been a life saver. I walked in with very little knowledge on parts let alone how to repair my unit. All I had was my brother in FL who knows more than I do and Cecil at HVAC Depot. With 2 young kids at home I couldn't afford to wait for a HVAC tech. Cecil walked me through what I needed to know, even after hours when the shop closed. I successfully repaired the fan motor and replaced the capacitor. Thank you HVAC team for being totally awesome. Prices were amazing and I'm forever going to support this small family business. You and your family are what Texas is all about!!!
Verified Buyer
Linda Robinson
I called HVAC Depot and was absolutely blown away by the fast, courteous and exceptional service. They were very knowledgeable about explaining what they were doing and what had happened to the ac system. If you ever need a HVAC team they are best and they won’t hesitate by coming out and they won’t leave until you are happy with the service. Thank you so much for your excellent service. Kudos to you Michelle for your amazing customer service.
Verified Buyer
Paul Hamer
My AC went out in our home on Friday night. I went out and got the capacitor details and took them here first thing Saturday morning. Lady at the counter was friendly and had the capacitor I needed! When I got home, I installed the capacitor and AC is all good!!
Verified Buyer
Jeff Ledesma
Awesome support and had everything I needed for an older unit! Then helped me out with the DIY!! Air conditioning back up and running at 100%!!
Thanks for everything
Verified Buyer
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HVAC Parts and Equipment Depot
Frequently Asked Questions
Questions? We’ve got you covered
We are open to the public! Homeowners, landlords, and DIYers are all welcome—no license required.
We carry blower motors, fan motors, capacitors, control boards, contactors, thermostats, filters, copper lines, refrigerants, and more.
Yes, we stock OEM and compatible replacement parts for major brands including Trane, Goodman, Lennox, Carrier, Rheem, and others.
Absolutely! Bring in the part, model number, or a picture, and our team will help match you with the correct replacement.
Yes, we accept returns or exchanges within a set time period—just make sure the item is unused and in original packaging. Ask for specific terms at the counter.
While we don't install, we can answer basic questions and refer you to trusted local HVAC technicians if needed.
We sell certain refrigerants, but EPA regulations require certification for purchase of products like R-410A or R-22.
We offer both! You can shop in person or call to arrange shipping if you're out of town.