From inside (document excerpt):
58CTA/CTX PERFORMANCETM 80 TWO STAGE 4 WAY MULTIPOISE INDUCED COMBUSTION GAS FURNACE Input Capacities: 45,000 thru 155,000 Btuh Series 140 Product Data the home by automatically adjusting high and low heat times to maximize comfort. The 58CTA/CTX furnaces are approved for use with natural or propane gas, and the 58CTX is approved for use in Low NOx Air Quality Management Districts. STANDARD FEATURES S ComfortHeatt Technology Intelligent microprocessor control S Two-stage heating with single-stage thermostat with patented Adaptive Control Technology S Very low operating sound through low-stage operation and QuieTecht system S SmartEvapt-Humidity control when using a Thermidistatt control S Comfort Fant adjustable constant fan speed from the thermostat S Microprocessor based control center Enhanced diagnostics with LED and reflective sight glass Stores fault codes during power outages Adjustable heating air temperature rise Adjustable cooling airflow S 4-way Multipoise furnace, 13 vent applications S Compact design – only 33-1/3 in.
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(847 mm) tall S Power Heatt Igniter S Draft Safeguard switch to ensure proper furnace venting S Insulated blower compartment S Inner door for tighter sealing S Certified to leak 2 percent or less of its nominal air conditioning CFM delivered when pressurized to 1-In. Water Gauge with all present air inlets, air outlets, and condensate drain port(s) sealed. S HYBRID HEATr Dual Fuel System compatible S All models are Chimney Friendly when used with accessory vent kit S Twinning in Upflow, Downflow and Horizontal S Residential installations eligible for consumer financing through the Retail Credit Program Performance A10249 THE PERFORMANCE 80 GAS FURNACE The 58CTA/CTX Two-Stage, 4-way Multipoise Gas Furnaces offer unmatched comfort in their class with ComfortHeatt technology in an 80% AFUE gas furnace. You get the benefits of a ComfortHeatt technology furnace: reduced drafts, reduced sound levels, longer cycles, less temperature swings between cycles, and less temperature differences between rooms. Its exclusive, intelligent microprocessor control adapts to the heating needs of MODEL NUMBER NOMENCLATURE 58CTA 58CTA Two-Stage 4-Way Multipoise 58CTX Low NOx version 045 100 08 Nominal Cooling Size (Airflow at .5 e.s.p.) (400 CFM per 12,000 Btuh) 08 800 CFf7 12 1200 CFM 14 1400 CFM 16 1600 CFM 20 2000 CFM 22 2200 CFM 100 110 Input Capacity 045 44,000 Btuh 070 66,000 Btuh 090 88,000 Btuh 110 110,000 Btuh 135 132,000 Btuh 155 154,000 Btuh 120 130 140 Series Number 58CTA/CTX FURNACE COMPONENTS A02169 A02238 A02170 HEAT EXCHANGER CONTROL BOARD INDUCER BLOWER 2 FURNACE COMPONENTS INDUCER MOTOR ASSEMBLY VENT ELBOW PRESSURE SWITCHES MAIN LIMIT SWITCH (BEHIND GAS VALVE) BLOCKED VENT SWITCH FLUE COLLECTOR BOX GAS VALVE FLAME SENSOR MANUAL RESET LIMIT SWITCHES GAS MANIFOLD HOT SURFACE IGNITOR GAS BURNER BLOWER DOOR SAFETY SWITCH FURNACE CONTROL BOARD BLOWER AND MOTOR CAPACITOR/ POWER CHOKE A10313 NOTE: The 58CTA/CTX Furnaces are factory shipped for use with natural gas. These furnaces can be field-converted for propane gas with a factory-authorized and listed accessory conversion kit. 3 58CTA/CTX CARRIER ACCESSORIES A97432 CONTROLS: THERMOSTATS AND ZONING Available in programmable and non-programmable models, Carrier thermostats maintain a constant temperature level in the home. For the ultimate in home comfort, Carrier’s 2, 4, and 8-zone systems allow temperature control of individual “zones ” of the home. This is accomplished through a series of electronic dampers and remote room sensors.