Up-Flow Evaporator Coil Replacement in Plano, TX 75074

Factory Warranty HVAC Repair Completed by Greentech Engineering

📍 Location: Plano, Texas 75074
🏠 Property Type: Single-Family Home (Attic Up-Flow System)
🛠 Service: Evaporator Coil Replacement – Manufacturer Parts Warranty

When a homeowner in Plano, TX 75074 began experiencing reduced cooling performance and signs of refrigerant loss, our engineering team at Greentech Engineering Heating & Air Conditioning performed a full diagnostic evaluation. The issue was traced to a leaking up-flow evaporator coil located in the attic air handler system.

Rather than simply replacing the component, we followed a structured, manufacturer-compliant installation protocol to ensure long-term reliability, system efficiency, and full warranty protection.

Why the Evaporator Coil Is Critical to Your AC System

The evaporator coil is responsible for absorbing heat from indoor air. When refrigerant flows through the coil, it removes heat and humidity before the conditioned air is circulated back into the home.

When a coil fails due to corrosion, vibration wear, or manufacturing defect, homeowners may notice:

• Warm or weak airflow from vents
• Ice buildup on refrigerant lines
• Repeated refrigerant recharge needs
• High indoor humidity
• Rising energy bills
• Longer system run times

In North Texas—especially in Plano where summer temperatures exceed 100°F—evaporator coil integrity is essential for maintaining proper cooling and humidity control.

Scope of Work – Professional Coil Replacement Protocol

Our licensed and EPA-certified technicians completed the following steps:

1. Refrigerant Recovery & Safe Removal

All refrigerant was properly pumped down and recovered in compliance with EPA regulations. The failed evaporator coil was removed and disposed of according to environmental standards.

2. Drainage System Upgrade

Attic systems in Plano require special attention to condensation management. We:

• Installed a new OEM drain pan
• Installed a new float safety switch
• Cleared the condensation drain line using pressurized dry nitrogen
• Replaced drain trap and vent
• Performed necessary drain line modifications

Proper drainage prevents ceiling damage and secondary water issues common in attic installations.

3. Mechanical Installation & Air Sealing

The new up-flow evaporator coil was:

• Secured to the existing gas furnace and supply plenum
• Installed using hex washer head HVAC screws
• Reinforced with necessary structural support
• Fully sealed using HVAC metal tape and professional duct sealant

This ensures minimal air leakage and optimized static pressure performance.

4. Refrigerant Line Modifications & Brazing

Existing refrigerant line sets were modified as required. Connections were brazed using 15% silver brazing rod, ensuring strong, leak-resistant joints performed by certified technicians.

5. Nitrogen Pressure Test (Leak Verification)

The system was pressurized with dry nitrogen to 250 PSI and held for a minimum of 15 minutes to confirm zero pressure loss before proceeding.

Leak testing is essential for warranty validation and compressor protection.

6. Deep Vacuum Protocol

We evacuated the system below 500 microns, verified moisture removal, and confirmed stable vacuum levels before charging.

Moisture contamination is one of the leading causes of compressor failure. Skipping proper evacuation can reduce equipment lifespan significantly.

7. Charging & Performance Testing

After charging to manufacturer specifications, we:

• Verified superheat and subcooling values
• Confirmed proper airflow and temperature split
• Tested full system operation

The system was restored to optimal cooling performance.

Why Plano Homeowners Choose Greentech Engineering

Greentech Engineering Heating & Air Conditioning is an engineering-driven residential HVAC contractor serving Plano and the greater DFW area.

We are:

• Licensed & Insured HVAC Contractor
• 4.9★ Google Rated
• BBB A+ Rated
• Oncor Authorized Service Provider
• ACCA Manual J / S / D Focused
• NCI Air Balancing Certified
• Daikin Comfort Pro

We do not perform “shortcut” installations. Every coil replacement follows manufacturer and ACCA standards to protect equipment lifespan and energy efficiency.

Frequently Asked Questions (FAQ)

How do I know if my evaporator coil is leaking?

Common signs include ice on refrigerant lines, warm air, frequent refrigerant refills, or high humidity indoors. A professional pressure and leak test confirms the diagnosis.

Is evaporator coil replacement covered under warranty?

Most major manufacturers provide 10-year limited parts warranties if registered. Labor is typically not included unless extended coverage was purchased.

How long does coil replacement take?

Most attic up-flow installations in Plano require 4–6 hours depending on accessibility and system configuration.

Why is nitrogen pressure testing necessary?

It ensures no refrigerant leaks exist before charging the system. Skipping this step risks premature failure and voided warranty.

Why must the system be vacuumed below 500 microns?

Deep vacuum removes moisture and non-condensables that can damage the compressor and reduce system efficiency.

Can I just recharge refrigerant instead of replacing the coil?

If the coil is leaking, recharging is temporary. Refrigerant loss will continue, and repeated charging can damage the compressor.

Serving Plano, TX 75074 & North Dallas Communities

We provide professional HVAC repair, coil replacement, and system upgrades in:

• Plano
• Richardson
• Allen
• Murphy
• Wylie
• North Dallas

If your AC system is not cooling properly or showing signs of refrigerant issues, schedule a professional diagnostic before peak summer demand.

📞 Call Greentech Engineering Heating & Air Conditioning
📍 Plano, TX 75074
🌐 Book Service Online

Author

Siwei(Lucas) Chen
CTO | Greentech Engineering Heating & Air Conditioning

• B.S. Mechanical Engineering
• ACCA Certified (Manual J, S, D)
• NCI Certified – Air Balancing & Duct Optimization
• Daikin Comfort Pro & Oncor Service Provider
• 10+ Years Residential HVAC Engineering Experience in Dallas–Fort Worth

This article has been reviewed and approved by Greentech Engineering to ensure technical accuracy and compliance with professional HVAC installation standards.

Greentech Engineering Heating & Air Conditioning
Engineering-Driven Residential HVAC Specialists in Dallas–Fort Worth
Precision Installation. Long-Term Comfort.

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