4 Ton EcoTemp 14.5 SEER2 90K BTU Single Stage Gas System W5A5S48AKAWA, W5AM48M21XA, WFER090C048C
Four tons of cooling with proportionate gas heat, built on the 21-inch cabinet. The W5A5S48AKAWA condenser delivers 48,000 BTU/h of R-454B cooling at 14.5 SEER2 from a two-row, eight-circuit outdoor coil, matched to a W5AM48M21XA cased coil and the four-burner WFER090C048C furnace at 88,000 BTU/h input and 72,000 BTU/h output, 80% AFUE. The furnace's 048 airflow designation and 1,445 CFM rating are specified precisely for 4 ton service, making this the most cleanly matched large system in the range: the blower is sized for the cooling capacity rather than over or under it. It is intended for 2,000 to 2,800 square foot homes in warm and moderate climates, where the air conditioner does the heavy lifting and the furnace covers a genuine but not severe winter.
Is a 4 Ton / 90K BTU Gas System the Right Size?
At 48,000 BTU/h of cooling, this system typically serves 2,000 to 2,800 square feet, and less in hot climates with significant glass or high ceilings. The 72,000 BTU/h heat output is balanced against that, suiting design heating temperatures in the twenties and low teens. Four tons is a capacity where mistakes get expensive in both directions: too small and the system never catches up on 95-degree afternoons; too large and it short-cycles through a humid summer, leaving the house cool and clammy.
Duct capacity becomes a first-order constraint here. Roughly 1,600 CFM is required for 4 tons, and many homes carrying a 4 ton load were originally ducted for 3 or 3.5. Return grille area, filter face area, trunk sizing, and branch count all need review, because a system starved of return air loses capacity and efficiency no matter how well the equipment is matched. Insulation levels, window specification, infiltration, duct location, ceiling volume, and internal gains determine the underlying loads, and a room-by-room calculation is the only way to size the branches correctly.
Ideal for: Homes of roughly 2,000 to 2,800 square feet, warm and moderate climates from the Carolinas through Texas and Arizona, larger single-story ranch layouts, two-story homes on one zone with good duct distribution, and 4 ton replacements where the mechanical space accepts a 21-inch cabinet.
Need more capacity? Step up to the 5 Ton EcoTemp 15 SEER2 110K BTU Gas System W5A5S60AKAWA, W5AM61M21XA, WFER110C060C, or keep 4 tons of cooling and add heat with the 4 Ton EcoTemp 110K BTU Gas System WFER110C060C.
Recommended sizing ranges are general guidelines only. Actual system requirements depend on insulation, window area, air infiltration, duct design, occupancy, and local design temperatures. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condenser | W5A5S48AKAWA — 4 Ton (48,000 BTU) R-454B Single Stage Condenser |
|---|---|
| Indoor Cased Coil | W5AM48M21XA Multi-Position A-Coil with factory-installed TXV, 21 in. cabinet |
| Gas Furnace | WFER090C048C — 88,000 BTU/h input, 72,000 BTU/h output, 80% AFUE, 4 burners |
| Furnace Cabinet Width | 21 in. C-size cabinet, matched to the 21 in. class coil |
| Cooling Efficiency | 14.5 SEER2 (AHRI Certificate 215157965) |
| Refrigerant | R-454B low-GWP (A2L), 5.7 lb factory charge in the condenser |
| Blower / Airflow | 1/2 HP motor, 1,445 CFM rated cooling airflow, 048 airflow class matched to 4 tons |
| Outdoor Coil | Two rows, 8 refrigerant circuits, 20 fins per inch |
| Gas Type | Natural gas as shipped — LP conversion kit is an optional add-on, not included |
| Electrical | 208-230V, Single Phase, 60 Hz condenser — MCA 29.1A, max fuse 50A |
The 048 airflow designation is the detail worth noticing on this listing. It means the WFER090C048C blower is certified for cooling systems up to 4 tons, which is exactly the capacity of the condenser it ships with — no surplus and no shortfall. Electrically, the 4 ton condenser is a step up from anything below it, with a minimum circuit ampacity of 29.1 amps and a 50 amp maximum fuse, so existing 30 and 40 amp circuits from smaller equipment will need evaluation. Line sets are separate; this unit uses 7/8 inch vapor and 3/8 inch liquid, available among our copper line sets and fittings. For propane, add the EcoTemp AGAGC8NPS01C LP conversion kit from the drop-down.
Condenser, Coil & Furnace Features
W5A5S48AKAWA Outdoor Condenser
- 48,000 BTU nominal cooling, 14.5 SEER2 in this certified match
- Single stage hermetically sealed scroll compressor
- R-454B low-GWP A2L refrigerant, 5.7 lb factory charge
- Two-row outdoor coil with 8 refrigerant circuits
- 20 fins per inch across the coil face
- 75 dBA sound rating
- Bonderized galvanized steel cabinet with pre-paint finish
- Post-painted aluminum fins and coated wire grille
- 7/8 in. vapor and 3/8 in. liquid sweat connections
- MCA 29.1A, 50A maximum fuse, 208-230V single phase
W5AM48M21XA Cased Evaporator Coil
- 4 ton nominal coil matched to the 48,000 BTU condenser
- 1,200 to 2,000 CFM airflow range
- 21 in. class cabinet, flush with the C-size furnace
- Vertical A-coil configuration
- Multi-poise: upflow, downflow, horizontal left or right
- Factory-installed R-454B specific TXV
- Built for R-454B service only
- Fiberglass-reinforced thermoset polyester condensate pan
- Separate drain pan provisions for horizontal orientation
- Sweat connections with compression fitting provisions
WFER090C048C Gas Furnace
- 88,000 BTU/h input, 72,000 BTU/h output at 80% AFUE
- Four-burner single stage gas valve
- 21 in. C-size cabinet
- 1/2 HP blower motor, 1,445 CFM rated cooling airflow
- 048 airflow designation matched precisely to 4 ton cooling
- Upflow, downflow, and horizontal left or right installation
- Category I metal-vented for conventional flue systems
- Factory natural gas setup, field LP convertible
- 20-year limited heat exchanger warranty
- Standard 24V single stage thermostat control
Specifications & Manuals
Product documentation includes condenser and furnace technical specifications, installation instructions for all three components, cased coil literature, and warranty information to assist with equipment selection, installation, and service.
Frequently Asked Questions
Why is this system rated 14.5 SEER2 when the 3.5 ton version reaches 15.5?
Efficiency generally falls as nominal capacity rises within a single product platform, because coil surface and airflow do not scale in perfect proportion to compressor displacement. The W5A5S48AKAWA rates 14.5 SEER2 in this combination under AHRI certificate 215157965. That still meets current federal minimum efficiency requirements for its class, and the practical operating cost difference against a 15.5 SEER2 unit is modest relative to the capacity gained.
Does 72,000 BTU of heat output pair sensibly with 4 tons of cooling?
In warm and moderate climates, yes. A 2,400 square foot home in Georgia, Oklahoma, or central California can easily need 48,000 BTU/h of cooling and only 72,000 BTU/h of heat. In northern climates the same cooling capacity usually pairs with the 110,000 BTU/h input furnace instead. The two versions of this 4 ton system exist for that reason and are otherwise identical.
What breaker does the W5A5S48AKAWA require?
Minimum circuit ampacity is 29.1 amps with a maximum fuse or breaker rating of 50 amps. That is a meaningful jump from the 40 amp maximum on the 3.5 ton unit, and it means many retrofits will need conductor and disconnect evaluation rather than reuse. Size everything from the values in the W5A5S installation instructions and applicable electrical code.
Is the WFER090C048C blower adequate for a full 4 tons of cooling?
Yes, and that is why this pairing was built. The 048 designation certifies the blower for cooling systems up to 4 tons, with a 1,445 CFM rating and a 1/2 HP motor. Reaching about 1,600 CFM in the field depends on duct sizing and total external static pressure; where static is high, the 110,000 BTU/h furnace with its 1 HP blower provides more margin.
How does the 4 ton condenser coil compare with the 3.5 ton model?
Both use two-row coils at 20 fins per inch, but the 3.5 ton W5A5S42AKAWA carries nine refrigerant circuits while this 4 ton unit uses eight. Factory charge also differs, at 5.7 lb here versus 7.2 lb on the 3.5 ton. These are separate coil and circuiting designs rather than a simple scaling, which is part of why efficiency ratings differ between the two sizes.
Can this system replace an older 4 ton R-410A system on the same ductwork?
The ductwork is often reusable if it was correctly sized for 4 tons originally, but it should be verified rather than assumed — measured static pressure and airflow tell the real story. The refrigerant side is a different matter: R-454B is a mildly flammable A2L refrigerant with its own line set, leak testing, and installation requirements, and reuse of existing tubing must follow the guidance in the W5A5S installation instructions. Browse comparable packages on our complete split systems page.
W5A5S Technical SpecificationsW5A5S Installation InstructionsW5A5S Customer BrochureWFER Technical SpecificationsWFER Installation InstructionsW5AM Technical SpecificationsW5AM Installation InstructionsICP Warranty Certificate
