Goodman - 3 Ton/36,000 BTU Multi-Position Air Handler With ECM Motor and TXV - R32 - AMST36CU1300
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) |
AMST36CU1300 |
| Brand |
Goodman |
| Type |
Air Conditioning |
| Category |
Air Handlers |
| Ton |
3.0 Ton |
| Voltage |
208/230V |
| Refrigerant Type |
R-32 |
| Height (Inches) |
49 |
| Width (Inches) |
21 |
| Depth (Inches) |
21 |
| UPC # |
633190042088 |
Manual
What our Experts Think
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3 Ton / 36,000 BTU Capacity – Well‑matched for homes ~1,500–1,900 sq ft (depending on insulation and climate), delivering reliable air distribution for standard residential cooling systems.
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Multi‑Position Flexibility – Install upflow, downflow, or horizontal to suit tight attics, closets, basements, and varied duct layouts.
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Direct Drive Multi‑Speed ECM Motor – Electronically commutated blower motor improves energy efficiency, quieter operation, and better humidity control compared to basic PSC motors.
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Factory‑Installed TXV (Thermal Expansion Valve) – Precisely meters refrigerant for stable performance and optimized efficiency when paired with matched condensers.
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All‑Aluminum Evaporator Coil – Resists corrosion and supports effective heat transfer for long‑term reliability.
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Rigid SmartFrame™ Cabinet – Low air leakage, insulated panels, easy filter access, and robust build enhance efficiency, installation ease, and durability.
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R‑32 Refrigerant Optimized – Designed to work with next‑generation R‑32 refrigerant for modern efficiency and environmental performance.
Q&A
Q: What type of unit is the Goodman AMST36CU1300?
A: It’s a 3 ton, multi‑position air handler designed for central HVAC systems, providing indoor air distribution for cooling or heat pump applications.
Q: What blower motor does it use and what are the benefits?
A: This model uses a direct‑drive, multi‑speed ECM blower motor that delivers consistent airflow, improved efficiency, and quieter operation compared with standard motors.
Q: What does “multi‑position” mean for installation?
A: Multi‑position design supports upflow, downflow, or horizontal installation, making it versatile for attics, closets, basements, or crawlspaces.
Q: Is this air handler compatible with modern refrigerants?
A: Yes — it’s optimized for R‑32 refrigerant, which offers higher efficiency and lower environmental impact.
Q: What is the purpose of the factory‑installed TXV (Thermal Expansion Valve)?
A: The TXV precisely meters refrigerant flow, improving cooling efficiency and system responsiveness.
Q: What type of evaporator coil does it include?
A: It features an all‑aluminum evaporator coil for efficient heat transfer and corrosion resistance.
Q: What are the physical dimensions and airflow capability?
A: The unit typically measures around 21″ W × 21″ D × 49″ H, suitable for standard ducted installations with variable CFM airflow depending on setup.
Maintenance Tips
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Replace Air Filters Regularly: Check every 1–3 months to maintain airflow, protect the ECM motor, and optimize system efficiency.
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Keep the Unit & Surroundings Clean: Remove dust, dirt, and debris around the air handler to ensure unobstructed airflow and service access.
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Inspect Drain Pan & Condensate Lines: Ensure drains are clear to prevent water buildup and potential system damage.
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Check Electrical Connections: Periodically inspect wiring and connections for signs of wear or corrosion.
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Monitor TXV Operation: Ensure the thermostatic expansion valve functions properly for consistent refrigerant flow and cooling efficiency.
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Schedule Annual Professional Maintenance: Technicians should inspect the blower motor, coils, refrigerant lines, and overall system performance yearly.
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Listen for Unusual Noises: Any unusual sounds or airflow changes should be addressed promptly to prevent larger issues.
Damage 
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