ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONSPROCEDUREElectrostatic discharge can affect electronic components.Take precautions during furnace installation and servicing toprotect the furnace electronic control. Precautions will pre-vent electrostatic discharges from personnel and hand toolswhich are held during the procedure. These precautions willhelp to avoid exposing the control to electrostatic dischargeby putting the furnace, the control, and the person at the sameelectrostatic potential.1. Disconnect all power to the furnace. DO NOT TOUCH THECONTROL OR ANY WIRE CONNECTED TO THE CON-TROL PRIOR TO DISCHARGING YOUR BODY’S ELEC-TROSTATIC CHARGE TO GROUND.2. Firmly touch a clean, unpainted, metal surface of the furnacechassis which is close to the control. Tools held in a person’shand during grounding will be satisfactorily discharged.3. After touching the chassis you may proceed to service thecontrol or connecting wires as long as you do nothing thatrecharges your body with static electricity (for example; DONOT move or shuffle your feet, DO NOT touch ungroundedobjects, etc.).4. If you touch ungrounded objects (recharge your body withstatic electricity), firmly touch furnace again before touchingcontrol or wires.5. Use this procedure for installed and uninstalled (ungrounded)furnaces.6. Before removing a new control from its container, dischargeyour body’s electrostatic charge to ground to protect thecontrol from damage. If the control is to be installed in afurnace, follow items 1 through 5 before bringing the controlor yourself into contact with the furnace. Put all used ANDnew controls into containers before touching ungroundedobjects.7. An ESD service kit (available from commercial sources) mayalso be used to prevent ESD damage.INTRODUCTIONThe model 58DXT Series 110 or Series 120 Furnace is available insizes 63,000 through 105,000 Btuh input capacities.The design of the downflow gas-fired furnace is A.G.A./C.G.A.certified for natural and propane gases and for installation onnoncombustible flooring. The furnace is factory-shipped for usewith natural gas. The manufacturer’s accessory gas conversion kitis required to convert furnace for use with propane gas.These furnaces SHALL NOT be installed directly on carpeting,tile, or any other combustible material other than wood flooring. InFig. 1—Dimensional DrawingA991094 3⁄16″ 2″2 15 ⁄16″13 ⁄16″11 ⁄16″9 1 ⁄8″10 1⁄4″1 1⁄16″2 1⁄8″8 1⁄4″ 10 1⁄4″1 1⁄16″2 1⁄8″16 1⁄16″13 5 ⁄16″19″ 11⁄16″13 ⁄16″11 ⁄16″20″28 1⁄2″39 7⁄8″D5⁄8″ TYP1″ TYPEAAIRFLOWOUTLETINLET1⁄2″ DIATHERMOSTATWIRE ENTRY7⁄8″ DIAACCESSORY7⁄8″ DIAACCESSORYDIMPLES TO DRILL HOLESFOR HANGER BOLTS (4 PLACES)IN HORIZONTAL POSITIONADDITIONAL 7⁄8″ DIA K.O. ARELOCATED IN THE TOP PLATEAND BOTTOM PLATENOTE:7⁄8″ DIA HOLEPOWER ENTRY1 1⁄2″ DIAR.H. GAS ENTRY7⁄8″ DIAACCESSORY1 3⁄4″ DIA HOLEGAS ENTRYVENT CONNECTION1. Two additional 7⁄8-in. dia holes are located in the top plate.2. Minimum return-air openings at furnace, based on metal duct. If flex duct is used,see flex duct manufacturer's recommendations for equivalent diameters.a. For 800 CFM–16-in. round or 14 1⁄2 x 12-in. rectangle.b. For 1200 CFM–20-in. round or 14 1⁄2 x 19 1⁄2-in. rectangle.c. For 1600 CFM–22-in. round or 141⁄2 x 23 1⁄4 -in. rectangle.d. For airflow requirements above 1800 CFM, must use entire return air opening.NOTES:Table 1—Dimensions (In.)UNIT SIZE A D E VENT CONN SHIP. WT060-12 14-3/16 12-9/16 12-11/16 4 141080-16 17-1/2 15-7/8 16 4 154100-20 21 19-3/8 19-1/2 4 1792→