Carrier 58MCA 7SI Gas Furnace Owners Manual

58MCA 4-Way Multipoise Fixed-Capacity Direct-Vent Condensing Gas Furnace Visit www.carrier.com Installation, Start-Up, and Operating Instructions For Sizes 040-140, Series 140 (LIMITED) ama CERTIFIED A93040 NOTE: Read the entire instruction manual before starting the installation. Index Page DIMENSIONAL DRAWING 2 SAFETY CONSIDERATIONS .3 Clearances to Combustibles 3 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 4 INTRODUCTION 4 APPLICATIONS 5-12 General 5 Upflow Applications 5-7 Downflow Applications .7-8 Horizontal Left (Supply-Air Discharge) Applications .8-10 Horizontal Right (Supply-Air Discharge) Applications .10-12 LOCATION 12-13 General 12 Furnace Location Relative to Cooling Equipment 13 Hazardous Locations .13 INSTALLATION 13-17 Leveling Legs (If Desired) .13 Installation In Upflow and Downflow Applications 13-15 Installation In Horizontal Applications 15 Filter Arrangement 16 Bottom Closure Panel .16 Gas Piping 16-17 AIR DUCTS 17-18 General Requirements .17 Ductwork Acoustical Treatment .18 Supply Air Connections 18 Return Air Connections 18 ELECTRICAL CONNECTIONS .18-19 115-v Wiring 18-19 24-v Wiring .19 Accessories 19 DIRECT VENTING .19-29 Removal of Existing Furnaces from Common Vent Systems 19-21 Combustion-Air and Vent Piping .21-27 Concentric Vent and Combustion-Air Termination Kit Installation .28 Multiventing and Vent Termination .28 CONDENSATE DRAIN 30-32 General 30 As an ENERGY STAR® Partner, Carrier Corporation has determined that this product meets the ENERGY STAR® guidelines for energy efficiency.

REGISTERED QUALITY SYSTEM AIRFLOW UPFLOW HORIZONTAL LEFT DOWNFLOW AIRFLOW HORIZONTAL RIGHT AIRFLOW AIRFLOW Fig. 1–Multipoise Orientations A93041 Application 30 Condensate Drain Protection 32 SEQUENCE OF OPERATION 32-34 Heating Mode 32 Cooling Mode .32 Continuous Blower Mode .33 Heat Pump Mode 33 Component Test 33 START-UP PROCEDURES 34-42 General 34 Prime Condensate Trap With Water 34 Purge Gas Lines 34 Adjustments .35-42 Set Gas Input Rate 35-41 Set Temperature Rise 41-42 Blower Off Delay (Heat Mode) .42 Set Thermostat Heat Anticipator 42 CHECK SAFETY CONTROLS 42 Check Primary Limit Control .42 Check Pressure Switch .42 CHECKLIST 43 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 535-758 Printed in U.S.A. Form 58MCA-7SI Pg 1 1-00 Replaces: New Tab 6a 8a 26 15/16 ” 28 1/2 ” 26 15/16 ” AIRFLOW 26 1/4 ” 13/16 ” 9/16 ” 26 1/4 ” A 13/16 ” 24 22 5/16 ” 19 ” OUTLET 2-IN. COMBUSTIONAIR CONN