4 Ton EcoTemp R-454B Multi-Positional Cased Coil, W5AM48M21XA
The W5AM48M21XA gets four tons of R-454B capacity out of the same 21 in. by 29-3/4 in. cabinet the 3.5 ton coil uses, which makes it the obvious choice when a system is being upsized but the mechanical closet is not changing. It handles 1200 to 2000 CFM, produces 64.4 MBH gross at 1600 CFM, and connects with a 7/8 in. suction and 3/8 in. liquid line. Factory-installed R-454B TXV, dual sloped FRTP drain pans, pre-cut UV knockouts and the full A2L leak dissipation package are all included, along with multi-poise capability for upflow, downflow and both horizontal orientations.
Is a 4 Ton Cased Coil the Right Size?
Four tons of nominal capacity generally serves 2,200 to 2,800 sq. ft. homes, or smaller properties with high ceilings, west-facing glass or a demanding climate zone. Rated data runs from 1200 to 2000 CFM, giving the coil a broad enough window to work with a variable-speed blower staging across cooling, dehumidification and fan-only modes.
At this capacity, airflow becomes the limiting factor more often than the coil does. Two thousand CFM through a coil, a filter and a residential duct system is a real load on a blower, and the static pressure drop tables are worth reading before assuming the existing air handler can do it. ICP also lists an alternate wire harness and relay kit, ACAWHNDIS01A, specifically for higher airflow applications. As always, the coil must be the one AHRI-certified with the outdoor unit for published performance to apply.
Ideal for: 2,200 to 2,800 sq. ft. homes, upsizing from 3.5 to 4 tons within an existing 21 in. cabinet, high-ceiling great rooms, and Sun Belt properties with heavy solar gain.
Need more capacity? Step up to the 5 Ton EcoTemp W5AM61M21XA Cased Coil, which holds the 21 in. width and reaches a full 5 tons in a taller 35 in. cabinet.
Recommended applications are general guidelines only. Actual coil selection depends on the AHRI-certified system match, blower capability, duct static, and local design conditions. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Model Number | W5AM48M21XA — 4 Ton Multi-Poise Cased Evaporator Coil |
|---|---|
| Nominal Capacity | 4 Ton / 48,000 BTUH |
| Coil Type | Vertical A-Coil, Cased |
| Airflow Configuration | Multi-Poise — Upflow, Downflow, Horizontal-Left, Horizontal-Right |
| Refrigerant | R-454B Only |
| Cabinet Width | 21 in. |
| Cabinet Height | 29-3/4 in. |
| Suction Line Connection | 7/8 in. Sweat |
| Liquid Line Connection | 3/8 in. Sweat |
| Metering Device | Factory-Installed R-454B TXV |
| Rated Airflow Range | 1200 – 2000 CFM |
| Operating Weight | 77.2 lb |
| Leak Dissipation | Complete A2L Dissipation System Included |
| Warranty | 5-Year Parts Limited; 10-Year with Registration Within 90 Days |
The 4 ton EcoTemp W5A5S48AKAWA condenser and the W5H5S48AKAAA heat pump are the intended outdoor matches. Because the coil shares its footprint with the 3.5 ton W5AM42M21XA, upsizing an existing installation rarely means rebuilding the plenum. Additional options are listed on the 4 to 5 ton cased coil page.
Cabinet & Coil Features
W5AM48M21XA Cabinet & Construction
- 21 in. wide by 29-3/4 in. tall casing, identical footprint to the 3.5 ton size
- 23.4 in. cabinet depth
- 24-gauge pre-painted taupe metallic steel construction
- Foil-faced R-2.1 insulation for quiet, efficient operation
- Two corrosion-resistant FRTP condensate pans supplied
- Both pans sloped for drainage in their respective orientations
- Primary and secondary 3/4 in. FPT drain connections
- Factory-installed UV knockouts
- 77.2 lb operating weight, 86.0 lb shipping
- Ships 30.5 in. high by 21.6 in. wide by 23.4 in. deep
W5AM48M21XA Coil, Metering & Installation
- 64.4 MBH gross at 1600 CFM, 67°F EWB, 45°F SST
- Broad 1200 to 2000 CFM rated airflow range
- Factory-installed R-454B specific thermostatic expansion valve
- 7/8 in. suction and 3/8 in. liquid sweat connections
- Straight tube stub-outs accept braze-less compression fittings
- Side-routed tubing for coil cleaning and TXV access
- ACAWHNDIS01A alternate wire harness and relay kit available for higher airflow
- Complete A2L dissipation system with factory-installed refrigerant sensor
- 2100 psi minimum burst pressure; split delta plate service access
- AHRI rated, UL and c-UL listed
Specifications & Manuals
Size 4821 static pressure drop values run from 600 through 2200 CFM in both dry and wet conditions — essential reading before designing near the top of the airflow range. The installation instructions cover refrigerant sensor orientation and the required operational checks for dissipation mode.
Frequently Asked Questions
Can the W5AM48M21XA replace a 3.5 ton coil in the same cabinet?
Dimensionally, yes — the 4821 and 4221 share a 21 in. by 29-3/4 in. by 23.4 in. casing and a 7/8 in. suction connection. The outdoor unit, blower and duct system all have to support 4 tons as well, so treat it as a system upsize rather than a coil swap.
What is the maximum rated airflow for the 4821 coil?
2000 CFM, with published capacity data at 1200, 1600 and 2000 CFM. Static pressure drop values are tabulated out to 2200 CFM so you can see what the blower is up against.
What is the cabinet footprint of the W5AM48M21XA?
21 in. wide, 29-3/4 in. tall, 23.4 in. deep, shipping in a 30.5 in. by 21.6 in. by 23.4 in. carton at 86.0 lb.
Which EcoTemp outdoor units match this 4 ton coil?
The W5A5S48AKAWA condenser for cooling and the W5H5S48AKAAA heat pump for heating and cooling. Verify the certified combination in the AHRI directory.
Does an A2L coil require special handling on site?
Yes. R-454B is a mildly flammable A2L refrigerant. The coil ships with a required dissipation system, and the installation instructions warn against servicing A2L refrigerant furnace coils while components are hot and against pressurizing with air or gas mixtures.
How is the refrigerant sensor positioned?
The sensor is factory installed. The installation instructions specify it must face down or horizontally and should never be positioned facing upward — worth confirming if the coil is rotated for a downflow or horizontal application.
W5AM Technical Specifications
