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.
4.9/5 based on 4750 reviews
TRADEPRO TP-90370 – Heavy-Duty SPDT Fan Relay (24 VAC)
TRADEPRO TP-90370 – Heavy-Duty SPDT Fan Relay (24 VAC)
Low stock: 4 left
Key Features & Specifications
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Industrial-grade 24 VAC switching relay for HVAC systems.
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SPDT configuration (1 Form C) for flexible wiring applications.
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Fully enclosed housing protects internal contacts for longer life.
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Standard 1/4" quick-connect terminals for fast installation.
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Direct replacement for Mars 90370 and White-Rodgers 90-370.
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Specifications
Specifications
Product Details and Key Specifications:
Part Number: TP-90370 (MFG: HCRY51CQ1AB217)
Manufacturer: TRADEPRO®
Part Type: General Purpose / Fan Switching Relay
Coil Voltage: 24 VAC
Contact Arrangement: SPDT (Single Pole Double Throw)
Contact Rating: 12A / 15A Res. @ 120V
Terminals: 1/4" Male Quick-Connects
description
description
TRADEPRO TP-90370 – Heavy-Duty SPDT Fan Relay (24 VAC)
The TRADEPRO® TP-90370 is a professional-grade Single Pole Double Throw (SPDT) switching relay designed for reliable control of blower motors, fans, and auxiliary HVAC components. This relay allows a low-voltage 24 VAC control signal to safely manage higher voltage loads. As a critical link in the system's electrical sequence, it ensures that high-amperage components engage only when triggered by the thermostat or control board.
Constructed for high-duty cycles, the TP-90370 features an enclosed design to protect electrical contacts from dust, moisture, and oxidation. The SPDT configuration provides both Normally Open (NO) and Normally Closed (NC) circuits, offering versatile wiring options for two-speed fan applications or interlocking safety circuits. Choosing a TRADEPRO® relay ensures industrial-strength switching reliability and a long mechanical life.
Key Features and Function:
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Precision 24V Control: Specifically tuned for standard 24 VAC HVAC control circuits to prevent sticking or failing to pull in.
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Dual-Circuit Flexibility: SPDT design allows for "change-over" switching between two different loads or speeds.
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Quiet & Reliable Operation: High-quality internal coil and contact points reduce mechanical hum and electrical arcing.
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Universal Mounting: Features a heavy-duty mounting bracket designed to fit standard screw patterns in most furnace and air handler cabinets.
Product Details and Key Specifications:
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Part Number: TP-90370 (MFG: HCRY51CQ1AB217)
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Manufacturer: TRADEPRO®
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Part Type: General Purpose / Fan Switching Relay
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Coil Voltage: 24 VAC
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Contact Arrangement: SPDT (Single Pole Double Throw)
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Contact Rating: 12A / 15A Res. @ 120V
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Terminals: 1/4" Male Quick-Connects
🛠️ HVAC Depot Pro Tip: The "Speed-Switching" Setup
The TP-90370 is the "go-to" relay for adding a manual fan-on option to older systems. When wiring for two-speed control, ensure the "Common" terminal is securely seated. If you hear a loud buzzing, check your common wire connection; a loose terminal creates high resistance that can melt the plastic housing of the relay before the fuse even blows.
Cross-Reference & Compatibility:
The TP-90370 is a direct replacement for many industry-standard SPDT relays, including:
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Mars: 90370, 90340
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Honeywell: R8222D1014
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White-Rodgers: 90-370
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Zettler: AZ2280-1C-24AF
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DiversiTech: REL-370
Extensive Model Compatibility List:
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Forced Air Systems: Used in residential and light commercial air handlers from Carrier, Goodman, York, and Nordyne.
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Specialty Controls: Compatible with electronic air cleaners, bypass humidifiers, and zone control panels.
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
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
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.

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!
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.
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!
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.
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!!!
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.
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!!
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
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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.