Fujitsu Modulating Upflow Gas Furnace - FF***LM98 Series
Product Overview and Technical Specifications
Key Features
- 98% residential gas furnace CSA certified
- Upflow configuration
- Modulating operation for energy savings and optimal comfort
- Variable speed blower motor for humidity control, quiet operation, and year-round energy savings
- EcoNet enabled HVAC product
- Diagnostics with 7-Segment LED
- DSI Ignition System for reliability
- Water Management System with patented Blocked Drain Sensor
- Industry's highest AFUE Gas Furnace family (98% AFUE across all models)
- Heat exchanger: Aluminized steel primary, stainless steel secondary for corrosion resistance
- Low profile "34 inch" cabinet for space-constrained installations
- Serviceable blower shelf design
- Pre-marked hoses for proper system drainage
- Ventable with 2" or 3" PVC
- Replaceable collector box
- Hemmed edges on cabinet and doors
- Quarter turn door fasteners for tool-less access
- Integrated control boards with dip switches for easy setup
- Self-priming condensate trap
- Solid bottom included
- Optional: Communicating Control Center for fully communicating HVAC systems
- Modulating Function: 40% to 100% capacity with compatible thermostat
- Two-stage Function: 40%, 65%, 100% capacity with two-stage thermostat
- Multistage Function: 40%, 65%, 100% capacity with single-stage thermostat
- Cabinet air leakage less than 2% at 1 inch H2O (ASHRAE 193)
Specifications
| Model Number | High Fire Input BTU/HR [kW] | Low Fire Input BTU/HR [kW] | Heating Capacity BTU/HR [kW] | Blower (D x W) [mm] | Motor H.P. [W]-Type | Min. Circuit Ampacity | Max. Overload Protection Device | Min. Ext. Static Pressure IN. W.C. [kPa] | Max. Ext. Static Pressure IN. W.C. [kPa] | Max. Heating CFM [L/s] | Cooling CFM @ .50" W.C. [.124 kPa] E.S.P. [L/s] | Temp Rise - High Fire °F [°C] | Temp Rise - Low Fire °F [°C] | Approx. Shipping Weight (LBS) [kg] | AFUE |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FF60173LM98U | 56,000 [16.41] | 22,400 [6.56] | 55,000 [16.12] | 11 x 8 [279 x 203] | 1/2 [373] E.C.M. | 8.00 | 15.00 | .20 [.050] | 1.0 [0.249] | 954 [450] | 1050 [496] | 40 - 70 [22 - 39] | 20 - 50 [11 - 28] | 128 [58] | 98.7% |
| FF70173LM98U | 70,000 [20.50] | 28,000 [8.21] | 69,000 [20.22] | 11 x 8 [279 x 203] | 1/2 [373] E.C.M. | 9.00 | 15.00 | .23 [.057] | 1.0 [0.249] | 1109 [524] | 1050 [496] | 40 - 70 [22 - 39] | 20 - 50 [11 - 28] | 132 [60] | 98.3% |
| FF85215LM98U | 84,000 [24.61] | 33,600 [9.85] | 83,000 [24.32] | 11 x 10 [279 x 254] | 3/4 [559] E.C.M. | 12.00 | 20.00 | .28 [.070] | 1.0 [0.249] | 1294 [611] | 1750 [825] | 40 - 70 [22 - 39] | 20 - 50 [11 - 28] | 147.5 [67] | 98.1% |
| FF100215LM98U | 98,000 [28.72] | 39,000 [11.49] | 97,000 [28.43] | 11 x 10 [279 x 254] | 3/4 [559] E.C.M. | 13.00 | 20.00 | .28 [.070] | 1.0 [0.249] | 1644 [776] | 1750 [825] | 40 - 70 [22 - 39] | 25 - 55 [13 - 30] | 152 [69] | 98.1% |
| FF115245LM98U | 112,000 [32.82] | 44,800 [13.13] | 110,000 [32.24] | 11 x 11 [279 x 279] | 3/4 [559] E.C.M. | 12.00 | 20.00 | .28 [.070] | 1.0 [0.249] | 1629 [769] | 1750 [825] | 45 - 75 [25 - 41] | 20 - 50 [11 - 28] | 165 [75] | 98.6% |
NOTES: All models are 115V, 60HZ, 1 phase. Gas connection size is 1/2" [13 mm] N.P.T. AFUE calculated per DOE test procedures. Standard models comply with California low NOx requirements. Special notes regarding NOx emissions limits and rebate eligibility for California are applicable.
Model Number Identification
The model number indicates specific features:
- FF: Series designation
- Capacity (e.g., 60, 70, 85, 100, 115): Represents thousands of BTU/HR input (e.g., 60 = 60,000 [17.58 kW])
- Width (e.g., 17, 21, 24): Furnace width in inches
- Airflow (e.g., 3, 5): Airflow capacity (3 = 3 Ton, 5 = 5 Ton)
- Motor (e.g., L): L = ECM (Electronically Commutated Motor)
- Speed (e.g., M): M = Modulating
- Efficiency (e.g., 98): 98 = 98% AFUE
- Orientation (e.g., U): U = Upflow
Dimensional Data and Clearances
The FF***LM98 series furnaces are designed for upflow installation. The cabinet dimensions and required clearances for combustible materials are provided below. [ ] Designates Metric Conversions.
| Model | Left Side Clearance [mm] | Right Side Clearance [mm] | Back Clearance [mm] | Top Clearance [mm] | Front Clearance [mm] | Vent Clearance [mm] | Approx. Ship Weight [kg] | Flange Dimensions A [mm] | Flange Dimensions B [mm] | Flange Dimensions C [mm] |
|---|---|---|---|---|---|---|---|---|---|---|
| 060 | 0 | 0 | 0 | 1 [25] | 2 [51] | 0 | 58 | 445 | 413 | 412 |
| 070 | 0 | 0 | 0 | 1 [25] | 2 [51] | 0 | 60 | 445 | 413 | 412 |
| 085 | 0 | 0 | 0 | 1 [25] | 2 [51] | 0 | 67 | 533 | 502 | 500 |
| 100 | 0 | 0 | 0 | 1 [25] | 2 [51] | 0 | 69 | 533 | 502 | 500 |
| 115 | 0 | 0 | 0 | 1 [25] | 2 [51] | 0 | 75 | 662 | 591 | 589 |
Note: A service clearance of at least 24" [610 mm] is recommended in front of all furnaces. Supply and return are depicted as upflow configuration. Flange configuration may vary depending on installation orientation.
Diagram Description (Page 3): The diagram illustrates the internal components of the furnace, including the primary and secondary heat exchanger, modulating burners, pressure switches, control board, ECM motor, draft inducer, gas valve and manifold, and blocked drain sensor. It also shows the location of the remote sensor.
Diagram Description (Page 6): The diagrams show the external dimensions and connection points for the furnace from front, top, bottom, and side views. Key connection points include optional combustion air inlet, optional vent outlet, return air, optional condensate drain (upflow/downflow), gas connection, and electrical connections. Tables detail minimum clearances to combustibles and flange dimensions for various models.
Blower Performance Data
Heating CFM Options
| Model Number | Low Heat (40%) [L/s] | Medium Heat (65%) [L/s] | High Heat (100%) [L/s] |
|---|---|---|---|
| FF60173LM98U | 202 | 265 | 353 |
| FF70173LM98U | 220 | 300 | 411 |
| FF85215LM98U | 268 | 356 | 479 |
| FF100215LM98U | 257 | 404 | 609 |
| FF115245LM98U | 367 | 467 | 607 |
Cooling CFM Options
| Model Number | High Cooling CFM [L/s] | Target Cooling/Heat Pump Airflow [L/s] | Low Cooling CFM [L/s] | |||
|---|---|---|---|---|---|---|
| SW4=OFF, SW5=OFF | SW4=ON, SW5=OFF | SW4=OFF, SW5=ON | SW4=ON, SW5=ON | SW4=OFF, SW5=OFF | SW4=ON, SW5=OFF | |
| FF60173LM98U | 496 | 413 | 330 | 248 | 372 | 310 |
| FF70173LM98U | 496 | 413 | 330 | 248 | 372 | 310 |
| FF85215LM98U | 825 | 661 | 578 | 496 | 619 | 496 |
| FF100215LM98U | 825 | 661 | 578 | 496 | 619 | 496 |
| FF115245LM98U | 825 | 661 | 578 | 496 | 619 | 496 |
Note: Refer to Installation Manual for complete heating dip switch options.
Accessories
- Vent Termination Kits: RXGY-E02, RXGY-E02A, RXGY-E03, RXGY-E03A, RXGY-G02
- Combustion Air Drain Kits: RXGY-D05 (2"), RXGY-D06 (3")
- Neutralizer Kit: RXGY-A01
- Filter Racks (Upflow): RXGF-CB (Bottom), RXGF-CD (Side)
- Indoor Coil Casings: RXBC-D17A1, RXBC-D21A1, RXBC-D21B1, RXBC-D24A1
- High Altitude Kits: RXGY-F53 through RXGY-F57 (for specific models)
- L.P. Conversion Kit: RXGJ-FP37
- Condensate Pump Kit: PROSTOCK & 1PCB151TUL
- Combustible Floor Base: RXGC-B17, RXGC-B21, RXGC-B24
Note: Modulating furnaces require a 2% derate at altitudes above 2,000 feet. See Installation Instructions.
EcoNet Control
The EcoNet Control Center (FETST601SYS) is recommended for optimal performance. It acts as a hub for heating, cooling, and water heating systems, enabling fully communicating HVAC operation.
Contractor Benefits:
- Auto/Self Configuration
- Day-at-a-glance scheduling, programmable fan
- Intuitive wiring
- Dual fuel ready
- Optimized airflow
- System status and mode information
- Complete diagnostic information
Homeowner Benefits:
- Large, easy-to-read icons and characters
- Auto-mode control
- Smart recovery
- Continuous Fan Mode (5 speeds)
- Humidity Control
- Water heater, pool heater integration (check model compatibility)
EcoNet Control Accessories: Wall Plate = RCPN-AMC08. Available through PROSTOCK®.
Limited Warranty
Fujitsu General America, Inc. provides replacements for parts failing in normal use within the stated period, according to warranty terms.
- Parts: Ten (10) Years
- Heat Exchanger: Limited Lifetime
- Conditional Unit Replacement (Registration Required): Limited Lifetime
For complete warranty details, contact your local contractor or the Manufacturer.
