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From inside (document excerpt):
Product Data 58STA/STX 4-Way Multipoise Induced-Combustion Gas Furnace Input Capacities: 45,000 thru 155,000 Btuh THE CARRIER 58STA/STX GAS FURNACE The 58STA/STX 4-way Multipoise Gas Furnaces feature Carrier’s QuieTechTM noise reduction system for incredibly quiet induced draft operation. Applications are easy with 4-way multipoise design, throughthe-furnace downflow venting, 13 different venting options, and a door designed for easy service access.
An inner blower door is provided for tighter sealing in sensitive applications. The 58STA/STX furnaces are approved for use with natural or propane gas, and the 58STX is approved for use in Low NOx Air Management Districts. STANDARD FEATURES QuieTech noise reduction system Microprocessor based control center Adjustable heating air temperature rise Adjustable cooling airflow LED diagnostics and self test feature 4-way Multipoise furnace, 13 vent applications Only 33-1/3 tall Inner blower door Hot surface ignition (HSI) Draft safeguard switch to ensure proper furnace venting Heat pump compatible Residential installations eligible for consumer financing through the Retail Credit Program LIMITED WARRANTY A02177 20-year warranty on “Super STM ” heat exchanger 5-year parts warranty on all other components Form 58ST-2PD 2003 Carrier Corporation 24V R TEST/TWIN HUM 3-AMP FUSE SEC-1 EAC-2 PRI A02169 A02015 A02170 HEAT EXCHANGER CONTROL BOARD I NDUCER BL OWER Model number nomenclature 58STA 045 100 58STA 4-Way Multipoise 58STX Low NOx version 08 Nominal Cooling Size (Airflow at .5 e.s.p.) (400 CFM per 12,000 Btuh) 08 — 800 CFM 12 — 1200 CFM 14 — 1400 CFM 16 — 1600 CFM 20 — 2000 CFM 22 — 2200 CFM 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 Series Number 2 FURNACE COMPONENTS INDUCER MOTOR ASSEMBLY VENT ELBOW MAIN LIMIT SWITCH (BEHIND GAS VALVE) PRESSURE SWITCH FLUE COLLECTOR BOX GAS VALVE GAS BURNER MANUAL RESET LIMIT SWITCHES HOT SURFACE IGNITER FLAME SENSOR BLOWER DOOR SAFETY SWITCH A02173 DRAFT SAFEGUARD SWITCH GAS MANIFOLD CONTROL BLOWER AND MOTOR RATING PLATE NOT SHOWN (LOCATED ON BLOWER DOOR) A03059 *Elbow may be turned to a different position, depending on type of installation NOTE: The 58STA/STX 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.