Carrier Owners Manual - Enlarge page 1 of 16
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From inside (document excerpt):
58STA/STX 4 WAY MULTIPOISE INDUCED COMBUSTION GAS FURNACE Input Capacities: 45,000 thru 155,000 Btuh Series 140 Product Data THE CARRIER 58STA/STX GAS FURNACE The 58STA/STX 4-way Multipoise Gas Furnaces feature Carrier’s QuieTecht noise reduction system for incredibly quiet induced draft operation. Applications are easy with 4-way multipoise design, through-the-furnace downflow venting, 13 different venting options, and designed for easy service access.
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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 S QuieTecht noise reduction system 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. (847 mm) tall S Power Heatt Igniter S Draft safeguard switch to ensure proper furnace venting 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.