Carrier · Infinity 96 (59TN6B) · Model
Carrier Infinity 96 59TN6B 080C21–20
The 59TN6B 080C21–20 is the 80,000 BTU/h, 21-inch-wide Infinity 96: 52,000 BTU/h on low fire, 78,000 BTU/h output on high, 96.7% AFUE upflow and horizontal, with a 1 HP constant-airflow ECM blower. It is the family's highest-certified size and suits larger detached houses.
Rating plate
- Model
- 59TN6B 080C21–20
- Input
- 52,000 – 80,000 BTU/h
- Output
- 51,000 – 78,000 BTU/h
- AFUE
- 96.7% upflow · 95% down/horiz
- Burner
- Two-stage
- Blower
- ECM, constant airflow
- Fuel
- Natural gas / Propane
- Cabinet
- 35 × 21 × 30 in
- Canada
- Available in Canada
At 80,000 BTU/h input this Infinity 96 delivers 78,000 BTU/h on high fire and 51,000 BTU/h on low, certified at 96.7% AFUE upflow and horizontal, the family's best figure, and 95.0% downflow. The 21-inch cabinet carries a 1 HP communicating constant-airflow blower that reaches 1,945 CFM for cooling at 0.5 in. w.c., enough for a 4.5- to 5.5-ton coil.
The 17.5-inch sibling (080C17–14) shares the same gas inputs, certifies 96.2% upflow and horizontal, and uses a 1/2 HP blower with a smaller 16-inch media cabinet; the wider 080C21–20 is chosen when cooling airflow matters more than cabinet width.
An 80,000 BTU/h input furnace is oversized for many modern Lower Mainland houses. Carrier's product data is explicit that excessive oversizing can shorten furnace and vent life; the size belongs to a heat-loss calculation, not to the old furnace's rating plate.
Specifications
From Carrier's published product data. Input and output are listed separately; AFUE depends on installation position.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, high heat | 80,000 BTU/h | |
| Input, low heat | 52,000 BTU/h | |
| Output | ||
| Output capacity, high heat | 78,000 BTU/h | Carrier product data; DOE test procedure, position dependent. |
| Output capacity, low heat | 51,000 BTU/h | |
| Efficiency | ||
| AFUE, upflow / horizontal | 96.7 % | |
| AFUE, downflow | 95 % | |
| Airflow | ||
| Certified temperature rise, high heat | 40 – 70 °F (22 – 39 °C) | |
| Certified temperature rise, low heat | 30 – 60 °F (17 – 33 °C) | |
| Airflow, high heat @ rated ESP | 1,345 CFM | |
| Airflow, low heat @ rated ESP | 1,095 CFM | |
| Cooling airflow range @ 0.5 in. w.c. | 750 – 1945 CFM | |
| Cooling capacity match | 4.5 tons @ 400 CFM/ton; 5.5 tons @ 350 CFM/ton | |
| Blower motor | Communicating variable-speed, constant-airflow (VCA) ECM | Measures and holds the airflow the control requests. |
| Physical | ||
| Cabinet width | 21 in | 533 mm |
| Cabinet depth | 30 in | |
| Approximate shipping weight | 171.5 lb | 77.8 kg |
| Cabinet height | 35 in | 889 mm |
| Installation positions | Upflow, downflow, horizontal left, horizontal right | |
| Venting | ||
| Venting | Direct vent (2-pipe), single-pipe, or ventilated combustion air | Maximum equivalent vent length depends on size, pipe diameter and altitude; see installation instructions. |
| Electrical | ||
| Blower motor | 1 HP | |
| Maximum input amps | 13.6 A | |
| Maximum fuse / breaker | 20 A | |
| Electrical supply | 115 V, 60 Hz, 1 phase (104 – 127 V) | |
| Controls | ||
| Burner staging | Two-stage (low and high fire) | |
| Other | ||
| Burners | 4 | |
| Factory-supplied media cabinet | 20 in (508 mm) | |
| Inducer | Two-speed | |
| Fuel | Natural gas; propane with gas conversion accessory kit | |
Variants
Sizes that share this model page. A variant gets its own page only when it has substantial independent value.
| Size | Input high | Input low | Output high | Output low | AFUE upflow | AFUE down/horiz | Width (in) | Ship wt (lb) | Cooling CFM | Motor HP |
|---|---|---|---|---|---|---|---|---|---|---|
| 080C21–20 | 80,000 | 52,000 | 78,000 | 51,000 | 96.7 | 95 | 21 | 171.5 | 750 – 1945 | 1 |
| 080C17–14 | 80,000 | 52,000 | 78,000 | 50,000 | 96.2 | 95 | 17.5 | 152.5 | 520 – 1310 | 1/2 |
Filters, serial numbers and service parts
Components this family's service documentation covers
- Hot-surface ignitor
- Flame sensor
- Pressure switches
- Inducer motor
- Condensate trap and drain components
- Constant-airflow ECM blower
- Control board
Service-parts list source: Components documented for service in 59TN6B product data and service literature.
Best for
- Larger detached homes whose heat-loss calculation supports the capacity
- Homes building a communicating Infinity system with 4- to 5-ton cooling
- Replacements where a heat-loss calculation confirms the size
Compatible controls
- Communicating Infinity system with Infinity Control, Infinity air conditioner or heat pump
- Compatible with single- and multiple-zone Infinity systems
- Self-diagnostics and extended diagnostic data through the Advanced Product Monitor (APM) accessory or Infinity User Interface
System integrations
- Infinity air conditioner or heat pump (dual-fuel) with communicating control
- Infinity zoning for single- and multiple-zone systems
- Factory-supplied external media filter cabinet
Manuals, codes and service
Documents
Fault codes that apply
None documented yet.
BC Wide service
Compare
Guides that reference this model
This catalogue page is reference information for anywhere in Canada. On-site service for this model is available across Greater Vancouver from BC Wide's Burnaby base — see furnace service in Burnaby and all service areas.
Questions people ask
What is the difference between the 080C21–20 and the 080C17–14?
Same gas inputs. The 080C21–20 has the 21-inch cabinet, 1 HP blower (up to 1,945 CFM cooling airflow), 96.7% AFUE and a 20 in. media cabinet; the 080C17–14 uses a 17.5-inch cabinet, 1/2 HP blower and certifies 96.2%.
Can the Infinity 96 communicate with a heat pump?
Yes. It is designed for a complete Infinity System with an Infinity air conditioner or heat pump and an Infinity Control, which enables dual-fuel and staged operation through the communicating control.
Considering the 59TN6B 080C21–20?
Get a published ballpark range for a supply-and-install, then a consultation to confirm sizing from a heat-loss assessment. Equipment-only pricing is not offered on this site.