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From inside (document excerpt):
Product Data HEATING & COOLING 58DFA High-Efficiency Downflow Induced-Combustion Gas Furnace Heating Inputs: 66,000 — 132,000 Btuh 78% AFUE With ContinuousPilot Ignition Carrier is the first manufacturer to provide a 78% Annual Fuel Utilization Efficiency (AFUE) gas furnace for the budget-conscious consumer and builder. The 58DFA offers the same high quality you demand from Carrier. The superior attention to cabinet detail is obvious.
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The Carrier 58DFA features 1-piece, seamless, wraparound construction. There are no spot welds on the exterior surfaces of the furnace. The cabinet is also double protected. First, a galvanized steel substrate provides resistance to rusting; then the cabinet is constructed of prepainted steel–the same highquality finish found on refrigerators and dishwashers. The 58DFA offers a proven continuous-pilot ignition system. This familiar continuous pilot provides superior reliability. The new inducer assembly provides for quieter start-up and operation. Carrier’s patented Super-S heat exchanger improves heat transfer and enables downsizing of this furnace to only 40-in. tall. It is covered by a 10-year heat exchanger Limited Warranty. The solid-state control board is the brain of this induced-combustion gas furnace. The control board features a 3-amp fuse which protects the transformer and board. Electronic Air Cleaner (EAC) and thermostat connection terminals are provided for easy connections. 1993 Carrier Corporation Form 58DFA-2PD This document was created with FrameMaker 4.0.4 1 COM PR-2 CFR LO HI L2 HFR L1 PR-1 3 1 2 3 4 5 6 7 8 9 PL-1 EAC-1 IDR EAC-2 SEC-2 SEC-1 MAX. 1.0 AMPS 115-VAC W Y R C G UNCUT: 120 SEC FU CUT: 180 SEC 3-AMP FUSE GROUND SCREW REQUIRED CES0110074-00 24-VAC COMMON BLOWER OFF-DELAY A89217 A91239 A92074 HEAT EXCHANGER PRINTED-CIRCUIT BOARD INDUCER BLOWER MEETS DOE RESIDENTIAL CONSERVATION SERVICES PROGRAM STANDARDS. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. Model number nomenclature 58DFA 071 120 08 Downflow Induced-Combustion Gas Furnace Cooling Size Airflow (400 CFM per 12,000 Btuh) 08 — 800 CFM 12 — 1200 CFM 16 — 1600 CFM 20 — 2000 CFM Input Capacity 071 — 66,000 Btuh 091 — 88,000 Btuh 110 — 110,000 Btuh 135 — 132,000 Btuh Series Number 2 Carrier accessories.