EcoTemp 3 Ton 15.5 SEER2 AC & 100,000 BTU 96.3% AFUE Gas Furnace – 21" Cabinet System
This is the heating-focused 3 ton package. The W5A5S36AKDWA R-454B condenser is paired with a larger 3.5 ton W5AM42M21XA coil, a match that raises the AHRI-certified cooling rating to 15.5 SEER2 (AHRI 217405720), compared with 15.2 SEER2 on the 17-1/2 in. 3 ton systems. Indoors, the WFSX100C060B furnace delivers 97,000 BTU of heat at up to 96.3% AFUE in a 21 in. wide cabinet. It suits homeowners in cold climates whose cooling need tops out at 3 tons but whose winter heat loss calls for a 100K furnace.
Is a 3 Ton AC with a 100K Furnace the Right Size?
This pairing fits homes where heating dominates: northern states, the Great Lakes, New England, and high elevations. A house in the 1,500 to 1,900 square foot range may need only 3 tons of summer cooling but well over 78,000 BTU of heat on design days, especially with older windows, a full basement, or limited wall insulation.
The 21 in. furnace and coil are wider than the 17-1/2 in. 3 ton systems, so measure the closet, the return drop, and the plenum before ordering. At elevations above 2,000 ft, input derates 4% per 1,000 ft. A Manual J heat-loss calculation is the right way to confirm that 97,000 BTU of output is needed.
Ideal for: Cold-climate homes with moderate summer loads, homes replacing an existing 100K furnace, mountain properties with elevation derate, and basements or utility rooms with room for a 21 in. cabinet.
Need more capacity? Step up to the EcoTemp 3.5 Ton 100K BTU Gas System (W5A5S42AKAWA) for more cooling with the same furnace and coil.
Recommended applications are general guidelines only. Actual system requirements depend on insulation, ductwork, climate, elevation, and a proper load calculation. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condenser | W5A5S36AKDWA — 3 Ton Single-Stage R-454B Air Conditioner |
|---|---|
| Indoor Coil | W5AM42M21XA — 3.5 Ton Multipoise Cased A-Coil, 21" Wide, Factory TXV |
| Gas Furnace | WFSX100C060B — 100,000 BTU Input / 97,000 BTU Output Condensing Furnace |
| Furnace Cabinet Width | 21" (35" tall) |
| Cooling Efficiency | 15.5 SEER2 (AHRI 217405720) |
| Heating Efficiency | 96.3% AFUE Upflow & Horizontal / 95% AFUE Downflow |
| Refrigerant | R-454B |
| Compressor | Single-Stage Scroll Compressor |
| Condenser Electrical | 208/230V, Single Phase, 60 Hz — 17.6 MCA, 30A Max Fuse/Breaker |
| Furnace Electrical | 115V, Single Phase, 60 Hz — 16.7 Unit Ampacity, 12 AWG Min., 20A Breaker |
| Manufacturer Warranty | 10-Year Parts with Timely Registration; 20-Year Furnace Heat Exchanger |
The coil is upsized because the 21 in. WFSX100C060B 100K furnace needs a 21 in. coil to match its width, and the W5AM42M21XA is AHRI-listed with this condenser. The larger coil surface is what lifts this 3 ton system to 15.5 SEER2. The coil stands 29-3/4 in. tall, for a stacked height of about 64-3/4 in., and both pieces are 21 in. wide. Heating-season comfort pairs well with a programmable thermostat for setback schedules.
Condenser, Coil & Furnace Features
W5A5S36AKDWA Condenser & W5AM42M21XA Coil
- 3 ton scroll condenser rated 15.5 SEER2 with this upsized coil match
- Two-row condenser coil with 20 fins per inch
- Direct-drive fan moving 3,800 CFM with vertical discharge
- Low-GWP R-454B refrigerant with a 6.9 lb factory charge
- Internal pressure relief, internal thermal overload, and a filter drier
- W5AM42M21XA: 3.5 ton rated A-coil, 21 in. wide, 29-3/4 in. tall
- 7/8 in. suction connection matching the condenser's 7/8 in. vapor valve
- About 72 lb operating weight, in a 24-gauge pre-painted cabinet
- Factory TXV plus a refrigerant sensor for the A2L dissipation system
- Vertical and horizontal FRTP drain pans for any orientation
WFSX100C060B 100K BTU Condensing Furnace
- 21 in. "C" cabinet, 35 in. tall, about 167 lb
- 100,000 BTU input, 97,000 BTU delivered heat, five burners
- 96.3% AFUE upflow and horizontal, 95.0% downflow
- Meets ENERGY STAR 5.0 South criteria
- 1 HP multi-speed constant-torque ECM blower, 1,730 CFM heating airflow
- 375–2,145 CFM cooling airflow range for future AC upgrades
- Rated heating external static pressure of 0.15 in. w.c.
- Adjustable heating blower off-delay up to 180 seconds
- Silicon nitride direct ignition with a redundant gas valve
- Meets 40 ng/J NOx requirements
Specifications & Manuals
Documentation includes condenser, coil, and furnace product data, installation instructions, line-set and venting tables, wiring diagrams, and warranty terms for selection, installation, and service.
Frequently Asked Questions
Why does this 3 ton system use a 21-inch cabinet?
The 100,000 BTU WFSX100C060B is built in the 21 in. "C" cabinet, and the coil is sized to match that width. If your closet only fits 17-1/2 in., look at the 60K or 80K versions of this 3 ton system.
Why is a 3.5 ton coil paired with a 3 ton condenser here?
The W5AM42M21XA is the 21 in. wide coil that fits the 100K furnace, and it is AHRI-certified with the W5A5S36AKDWA. The extra coil surface raises this system's rating to 15.5 SEER2.
Does a 100K furnace make sense with only 3 tons of cooling?
Yes, in heating-dominated climates where winter heat loss is much larger than summer heat gain. A load calculation should confirm you need the 97,000 BTU output, because a single-stage furnace that is too large will short-cycle.
What blower motor does the WFSX100C060B use?
A 1 HP multi-speed, constant-torque ECM direct-drive motor with an 11 x 10 in. blower wheel. It delivers 1,730 CFM in heating at rated static pressure.
Can this furnace be installed where low-NOx rules apply?
Yes. Every WFSX size can be installed in air quality management districts that require 40 ng/J NOx emissions.
How much does the W5AM42M21XA coil weigh?
About 72 lb operating weight and 80 lb shipping weight. It measures 29-3/4 in. tall by 21 in. wide.
W5A5S Technical SpecificationsW5A5S Installation InstructionsW5A5S Customer BrochureW5AM Technical SpecificationsW5AM Installation InstructionsWFSX Technical SpecificationsWFSX Installation Instructions
ICP Warranty Certificate
