4 Ton Goodman 15.2 SEER2 R32 Heat Pump System GLZS4BA4810, AMST48CU1300
This 4 ton Goodman split system combines the GLZS4BA4810 outdoor heat pump, built with an enhanced aluminum fin coil on 7 mm copper tubes, and the AMST48CU1300 air handler with a wider 10" x 10" blower. Together they provide 48,000 BTU/h of R-32 heating and cooling at 15.2 SEER2 under AHRI #215213861, serving larger homes, multi-story houses, and high-load spaces that need strong airflow and dependable year-round capacity.
Is a 4 Ton Heat Pump System the Right Size?
A 48,000 BTU/h heat pump is meant for substantial loads: larger two-story homes, houses with high ceilings or extensive glass, and homes in hot climates with long cooling seasons. It is also a common replacement size for older 4 ton systems in established neighborhoods.
At this capacity, airflow is the make-or-break factor. A 4 ton system needs properly sized supply and return ducts to deliver its rated performance without whistling registers or a noisy return. Insulation, climate, and how the home is used still drive the load, so confirm with a calculation before choosing between 3.5, 4, and 5 tons.
Ideal for: Larger two-story homes, homes with vaulted ceilings or lots of glass, hot-climate homes with long cooling seasons, and replacement of an existing 4 ton heat pump.
Need more capacity? Step up to the 5 Ton Goodman 14.5 SEER2 R32 Heat Pump System GLZS4BA6010, AMST60DU1300, the largest system in this series.
Recommended system sizes are general guidelines only. Actual heating and cooling requirements depend on insulation, climate, windows, ductwork, ceiling height, and occupancy. A Manual J load calculation is the best way to confirm sizing. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | GLZS4BA4810 — 4 Ton R-32 Single-Stage Heat Pump Condenser |
|---|---|
| Indoor Air Handler | AMST48CU1300 — 4 Ton Multi-Position ECM Air Handler with Internal TXV |
| System Rating | 15.2 SEER2, 48,000 BTU/h Nominal, AHRI #215213861 |
| Refrigerant | R-32 |
| Compressor | Single-Stage Scroll Compressor |
| Defrost | SmartShift® Defrost Technology |
| Electrical | 208/230V, Single Phase, 60 Hz Heat Pump — MCA 25.5 A, Max Breaker 40 A |
| Air Handler Electrical | 208/240V, Single Phase — 3/4 HP ECM Blower, 21" C Cabinet |
The AMST48CU1300 is the tallest C-cabinet model at 58", so measure closet height before ordering. It uses a 7/8" suction coil connection and a 10" x 10" blower to move the extra air a 4 ton system needs. Outdoors, plan for a 1-1/8" x 3/8" copper line set, a 40 A maximum breaker, and a sturdy condenser pad for the 269 lb unit.
Heat Pump & Air Handler Features
GLZS4BA4810 Outdoor Heat Pump
- 48,000 BTU/h nominal heating and cooling
- Enhanced aluminum fin coil with 7 mm copper tubes
- Single-stage scroll compressor (19.4 RLA)
- 1/4 HP PSC condenser fan motor
- SmartShift® defrost technology
- 174 oz factory R-32 charge for 15 feet of line
- Factory-installed crankcase heater and high-capacity muffler
- 35-1/2" W x 35-1/2" D x 36-1/2" H cabinet, 269 lbs
- Removable grille-style top for service access
- AHRI Certified and ETL Listed
AMST48CU1300 Multi-Position Air Handler
- 4 ton rating with a 10" x 10" blower assembly
- 3/4 HP direct-drive multi-speed ECM motor
- 7/8" suction and 3/8" liquid coil connections
- Factory-installed TXV and R-32 refrigerant sensor
- 21" C-width cabinet, 58" tall
- Horizontal or vertical configuration
- Cabinet air leakage under 2.0% at 1.0" H2O (ASHRAE 193)
- DecaBDE-free drain pan with secondary drain connections
- Tool-less access for a 19.5" x 20" filter
- Heat strip options up to 19 kW breakered on this listing
Specifications & Manuals
Documentation includes 4 ton capacity and electrical data, expanded heating tables for cold-weather planning, AMST48CU1300 dimensions and airflow, plus installation and warranty details.
Frequently Asked Questions
When is a 4 ton GLZS4BA4810 heat pump system the right choice?
It is the right size when a load calculation shows roughly 48,000 BTU/h, which is common in larger two-story homes, homes with high ceilings, and hot climates with long cooling seasons.
What makes the GLZS4BA4810 coil different from smaller GLZS4B models?
Goodman builds the 4 and 5 ton models with an enhanced aluminum fin coil on 7 mm copper tubes, while the 1.5 to 3.5 ton models use 5 mm tubes.
What electrical service does the 4 ton GLZS4BA4810 need?
Goodman lists a 25.5 A minimum circuit ampacity and a 40 A maximum overcurrent protection on 208/230V single phase. The air handler and heat strip need their own circuit.
How tall is the AMST48CU1300 air handler?
Per Goodman's dimension table, the AMST48CU1300 is 58" tall in a 21" C-width cabinet. Check closet height and clearances before installation.
Does the AMST48CU1300 use a larger blower than the 3.5 ton air handler?
Yes. It uses a 10" x 10" blower, compared with 10" x 8" on the AMST42CU1300. Both use a 3/4 HP ECM motor.
Can I pair a 4 ton heat pump with gas backup heat instead of heat strips?
This system is designed for electric heat strip backup. If you prefer gas backup, see our dual fuel heat pump systems.
GLZS4B Technical SpecificationsGLZS Installation ManualGLZS Warranty CertificateAMST Technical SpecificationsAMST Installation ManualAMST Warranty Certificate
