Goodman - 4 Ton/48,000 BTU Multi-Position Air Handler With ECM Motor and TXV - R32 - AMST48CU1300
The AMST is all about effective air distribution. It includes an all-aluminum evaporator coil and internal factory-installed valves for cooling and heat pump applications thermal expansion. These advanced components excel at ensuring that your home stays comfortable and your central system runs efficiently. The ECM fan motor is a huge step up from older models as it requires less electricity to operate and provides more consistent air circulation.
Features
- Internal factory-installed thermal expansion valves for cooling and heat pump applications
- Direct drive, multi-speed ECM blower motor
- All-aluminum evaporator coil
- Coil mounting track for quick repositioning
- Optimized for use with R-32 refrigerant
- Cabinet air leakage less than 2.0% at 1.0 inch Hâ‚‚O when tested in accordance with ASHRAE standard193
- Cabinet air leakage less than 1.4% at 0.5 inch Hâ‚‚O when tested in accordance with ASHRAE standard193
- AHRI certified; ETL listed
- Rigid SmartFrame cabinet
- Horizontal or vertical configuration capabilities
- 21" depth for easier attic access
- DecaBDE-free thermoplastic drain pan with secondary drain connections
- Screw-less sides and back helps to reduce con- densation when installed in humid locations
- Foil-faced insulation covers the internal casing to reduce cabinet condensation
- Galvanized, leather grain-embossed finish
- Glue-less cabinet insulation retention
- Tool-less filter access
Specifications
| Model Number(s) |
AMST48CU1300 |
| Brand |
Goodman |
| Type |
Air Conditioning |
| Category |
Air Handlers |
| Ton |
4.0 Ton |
| Voltage |
208/230V |
| Refrigerant Type |
R-32 |
| Height (Inches) |
58 |
| Width (Inches) |
21 |
| Depth (Inches) |
21 |
| Total Shipping Weight (lbs.) |
153 |
Manual
What our Experts Think
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High-Capacity Performance: 4 Ton / 48,000 BTU output ideal for medium to large homes.
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Multi-Position Flexibility: Supports upflow, downflow, or horizontal installations.
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Efficient Airflow: ECM motor ensures consistent, energy-saving performance.
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Precise Cooling: TXV (Thermostatic Expansion Valve) delivers accurate refrigerant control.
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Eco-Friendly Refrigerant: Uses R32 to minimize environmental impact.
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Durable Build: Engineered for long-term reliability across diverse climates.
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Quiet Operation: Optimized for low operational noise.
Q&A
Q: What is this Goodman AMST48CU1300?
A: It’s a 4 ton indoor air handler designed for central HVAC split systems, providing 48,000 BTU airflow with a multi‑speed ECM blower and internal TXV for efficient cooling and heat pump use.
Q: What type of blower motor does it include?
A: Features a direct‑drive, multi‑speed/9‑speed ECM blower motor for quiet, energy‑efficient airflow control across demand levels.
Q: What does “multi‑position” mean?
A: The air handler supports flexible installation orientations — horizontal or vertical — making it suitable for attics, closets, basements, or various duct layouts.
Q: How does the built‑in TXV help performance?
A: The internal Thermal Expansion Valve (TXV) precisely regulates refrigerant flow, improving cooling efficiency and system responsiveness.
Q: What refrigerant is it optimized for?
A: Designed specifically for R‑32 refrigerant, aligning with modern lower‑GWP HVAC system requirements.
Q: What are key durability and cabinet features?
A: It includes a SmartFrame™ rigid cabinet with foil‑faced insulation, screw‑less panels to reduce condensation, a DecaBDE‑free drain pan with secondary drain, and tool‑less filter access for simple service.
Q: How efficient is airflow and construction?
A: The all‑aluminum evaporator coil delivers efficient heat transfer, while cabinet construction minimizes air leakage for consistent performance.
Q: What electrical and dimensional specs should installers know?
A: Operates on 208/230 V single‑phase power, about 7.1 A minimum circuit, and fits in a 58″ H × ~21″ W × 21″ D cabinet — compact for many indoor spaces.
Maintenance Tips
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Replace or clean air filters every 1–3 months to maintain airflow and system efficiency.
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Keep supply and return vents clear of furniture, dust, and debris.
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Maintain 2–3 feet of clearance around the air handler for proper airflow and service access.
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Inspect the condensate drain line and pan regularly to prevent clogs and water damage.
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Check ECM blower motor operation for smooth, quiet airflow.
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Verify TXV (Thermostatic Expansion Valve) function to ensure proper refrigerant flow.
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Inspect ductwork and connections for leaks or blockages.
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Clean coil surfaces and blower compartment periodically to prevent dust buildup.
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Listen for unusual noises such as rattling, buzzing, or humming that may indicate mechanical issues.
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Schedule annual professional HVAC maintenance to inspect electrical components, refrigerant levels, and overall system performance.
Damage 
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