Carrier 58EFB Installation, Start-up, And Operating Instructions Manual

Also see for 58EFB: Installation, start-up, and operating instructions User's information manual

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Carrier 58EFB Installation, Start-up, And Operating Instructions Manual Manual pdf 14 page image

Never purge a line into a combustion chamber. Never usematches, candles, flame, or other sources of ignition for thepurpose of checking leakage. Use a soap-and-water solutionto check for leakage. Failure to follow this warning couldresult in a fire, explosion, personal injury, or death.Many soaps used for leak testing are corrosive to certainmetals. Piping must be rinsed thoroughly with clean waterafter leak check has been completed.Step 4—Operational CheckoutThis furnace is equipped with an automatic hot surface pilotignition control and does not require lighting of a pilot for furnaceoperation.Do not attempt to manually light pilot. Failure to follow thiswarning can lead to electrical shock which could result inbodily harm.The automatic gas valve controls the flow of gas to both the pilotand main burners. The manual valve built into automatic valvebody has 2 positions: OFF and ON.To shut off gas manually, turn knob from ON to OFF position.When in OFF position, main burners and pilot are extinguished.After duct work connections have been made, gas piping andelectrical wiring completed, and furnace had been properly vented,unit should be started and adjusted for proper operation. Check offthe following items as they are completed.1. Make sure all electrical power is off.2. Check all wiring using proper wiring diagram on inside ofcontrol box cover.3. Turn on electrical power to unit.4. Turn manual gas shutoff valve to ON position.5. Set thermostat above room temperature.6. The hot surface ignitor should heat up to an orange glow andignite pilot. If flame sensor detects a proper flame, mainburners will ignite. If main burners do not ignite, see AdjustPilot Flame section below.7. When main burners ignite, proceed to Set Gas Input Ratesection.Step 5—AdjustmentsADJUST PILOT FLAMEPilot assembly should be located as shown in Fig. 13. Adjust pilotflame to envelop the flame sensor for a distance of 3/8 to 1/2 in.(See Fig. 14.) The adjusting screw for pilot flame is located onmain gas control. (See Fig. 15.)SET GAS INPUT RATENever set furnace input rate above that shown on rating plate.Failure to follow this warning could lead to premature heatexchanger failure and a hazardous furnace operating condi-tion and result in serious bodily injury or loss of life.There are 2 methods of adjusting gas input rate. The preferredmethod is by using Table 5 and item 1. The second method is byclocking the gas meter and using item 2. Item 2 must be used foraltitudes above 2000 ft.1. Determine natural gas orifice size and manifold pressure forcorrect input using Table 5.a. Obtain average yearly heat value for local gas supply.b. Obtain average yearly specific gravity for local gas supply.c. Verify the furnace model. Table 5 can only be used formodel 58EFB Furnaces.d. Find natural gas heat value and specific gravity in Table 5.e. Follow heat value line and specific gravity line to point ofintersection to find orifice size and manifold pressuresettings for proper operation at given natural gas condition.f. Check and verify orifice size in furnace. NEVER ASSUMETHE ORIFICE SIZE. ALWAYS CHECK AND VERIFY.EXAMPLE:Heat value = 1025 Btu/cu ftSpecific gravity = 0.62.Therefore: Orifice No. 40 or 41*Manifold Pressure 3.3 or 3.5 in. wc* The furnace is shipped with No. 42 orifices. In thisexample all main burner orifices must be changed andmanifold pressure must be adjusted.g. Proceed to item 3 to adjust manifold pressure.Fig. 13—Position of Pilot Assembly to BurnerA96078Fig. 14—Position of Pilot Flame to Flame SensorA96077FLAMESENSINGRODHOTSURFACEIGNITOR3⁄8″ TO 1⁄2″14