Let’s Be Honest — Installation Ain’t Just About Plugging Things In
You’ve finally chosen the Goodman 3-Ton 15.2 SEER2 R-32 AC and Gas Furnace Combo — smart move. The GLXS4BA3610 condenser, CAPTA3626C3 coil, and GR9T961005CN furnace are designed to deliver high performance, clean efficiency, and reliable comfort year-round. But don’t let the “bundle” fool you into thinking the install will be smooth sailing.
As someone who’s seen more than a few installs go sideways, let me walk you through the real-life installation pitfalls that can mess with your comfort — and how to avoid them.
Pitfall #1: Not Pulling a Permit (Or Skipping Inspections)
Look, I know dealing with your local building department can be a pain. But installing a gas furnace and AC system without the proper permits or inspection can land you in hot water. Worse, it might void your warranty or leave you on the hook if something goes wrong.
Mike’s Tip:
Even if you’re DIY-ing, get the permits. Bring in an inspector to check for code compliance — especially when gas lines, refrigerant, and electrical are involved. It's not just red tape; it’s about safety.
Pitfall #2: Undersizing or Oversizing the Line Set
You can’t just slap on any old copper lines and call it a day. The refrigerant line set size must match Goodman’s spec for the GLXS4BA3610 unit. Too small and you’re throttling your system. Too big and the oil return won’t cycle properly.
According to HVAC School’s guide to refrigerant line sets, improper sizing can reduce efficiency and shorten compressor life — both major no-nos.
Mike’s Tip:
Use 3/4" suction line and 3/8" liquid line, unless Goodman tech specs say otherwise for your exact run length. Insulate the suction line fully — always.
Pitfall #3: Coil Orientation Confusion
The CAPTA3626C3 is a vertical coil — that means it’s designed for upright airflow configurations. But too often, I’ve seen techs try to shove it into a horizontal setup. That’s not just poor practice, it can cause condensate drainage issues and reduce airflow performance.
Mike’s Tip:
Double-check your airflow direction before installing. If you’re using a horizontal setup, you need a coil that’s designed for it. Don’t improvise with condensate drain pans or tilt angles — it doesn’t end well.
Pitfall #4: Skipping the Nitrogen Sweep
This one’s for the folks brazing copper. If you’re not sweeping with nitrogen, you’re creating scale and oxidation inside those lines. That gunk can clog expansion valves and mess with refrigerant flow in your R-32 system.
According to OSC, running a nitrogen purge is no longer just best practice — it’s essential for systems with A2L refrigerants like R-32.
Mike’s Tip:
Purge with 2–3 SCFH of nitrogen during brazing and then do a proper pressure test (typically 500 psi) after sealing. Follow up with vacuum to 500 microns — no shortcuts.
Pitfall #5: Improper Combustion Air and Venting for the GR9T961005CN Furnace
This 96% AFUE gas furnace needs dedicated combustion air and a proper two-pipe vent system. I’ve seen installs where folks re-use a single old flue, and that’s just asking for backdrafting or efficiency issues.
The International Residential Code (IRC) is clear: high-efficiency condensing furnaces must vent separately using PVC with proper pitch and termination clearance.
Mike’s Tip:
Use Schedule 40 PVC for both intake and exhaust. Maintain 1/4" per foot of slope away from the furnace, and keep the vent terminations at least 12" apart and 12" off the ground.
Pitfall #6: Forgetting to Match the Thermostat and Controls
A basic mercury thermostat isn’t going to cut it. This system performs best with multi-stage thermostat control to take advantage of the furnace’s modulating gas valve and ECM blower.
Mike’s Tip:
Upgrade to a smart thermostat compatible with multi-stage heat and cool. Check out models like the Honeywell T6 Pro, ecobee Smart Thermostat Premium, or Goodman’s own ComfortBridge-compatible units. Just make sure the wiring is up to par — you’ll need a C-wire.
Pitfall #7: Not Registering the Warranty
Goodman offers a 10-Year Parts Limited Warranty and Lifetime Heat Exchanger Warranty, but you only get the full coverage if you register the system within 60 days of installation.
As HVAC.com explains, skipping registration can leave you with just a 5-year base warranty — not ideal when you’ve made a serious investment.
Mike’s Tip:
Go to Goodman’s warranty registration page as soon as the install is done. Make sure you have all three model and serial numbers handy (condenser, coil, furnace). Register it online and keep a digital and printed copy.
Pitfall #8: Ignoring R-32 Handling Guidelines
R-32 is an A2L refrigerant, which means it’s mildly flammable. That doesn't mean it’s dangerous to use, but it does mean you need to follow specific safety procedures during installation, charging, and leak repair.
Mike’s Tip:
Only work with EPA-certified techs trained on A2L refrigerants. Make sure your tools — including leak detectors, gauges, and recovery units — are R-32 compatible. Ventilation and leak detection are especially critical in confined spaces.
You can learn more in this R-32 refrigerant overview by Daikin, one of the pioneers of the refrigerant shift.
Final Thoughts from Tony
The Goodman GLXS4BA3610, CAPTA3626C3, and GR9T961005CN system is a powerhouse when installed right. But even the best equipment can underperform — or worse, break down — if your install is rushed or careless.
Whether you’re a DIY warrior or hiring out the job, take the time to get it right. Follow codes, verify specs, and don’t cheap out on the details. This setup is built for long-term efficiency, but only if you lay the groundwork.
Want to make sure you're getting the right matched system straight from the source?
Check out the Goodman 3 Ton 15.2 SEER2 R‑32 System Bundle — complete with everything you need for high-performance comfort:
👉 Shop the Bundle Now
Curious about how all of these units work together? Visit: Condenser, Coil, Furnace—How the GLXS4BA3610 + CAPTA3626C3 + GR9T961005CN Trio Delivers Balanced Comfort.
Until next time,
- Tony the Trusted Tech
