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

Also see for 58RAV Series: Manual Service and maintenance instructions Maintenance and service instructions Operation guide Installation, start-up, and operating instructions

Contents

This feature helps diagnose a system problem in case of acomponent failure. To initiate component test procedure, short(jumper) the TEST 1/4-in. quick connect terminal on controlboard (adjacent to diagnostic light) and the Com terminal onthermostat connection block for approximately 2 sec. (See Fig.11.)NOTE: Component test feature will not operate if any thermostatsignal is present at control center.Component test sequence is as follows.a. Momentarily jumper TEST and Com terminals until LEDgoes off.b. LED will display previous fault 4 times.c. Inducer motor operates for 10 sec, then stops.d. Hot surface ignitor is energized for 15 sec, then de-energized.e. Blower motor operates on cooling speed for 10 sec, thenstops.f. Blower motor operates on heating speed for 10 sec, thenstops.3. To operate furnace, follow procedures on operating instructionlabel attached to furnace.4. With furnace operating, set thermostat below room tempera-ture and observe that furnace goes off. Set thermostat aboveroom temperature and observe that furnace restarts.ADJUSTMENTS1. Set gas input rate.There are 2 methods of adjusting the gas input rate. Thepreferred method is by using Table 7 and following instruc-tions in item a. The second method is by clocking the gasmeter and following instructions in item b.The gas valve regulator has been nominally set at 3.5-in. wcfor natural gas. When adjusting input rate, do not set manifoldpressure above 3.8-in. wc or below 3.2-in. wc.a. Check gas input rate using Table 7.(1.) Obtain average yearly heat value for local gas supply.(2.) Obtain average yearly specific gravity for local gassupply.(3.) Verify furnace model. Table 7 can only be used formodel 58RAV Furnaces.(4.) Check and verify orifice size in furnace. NEVERASSUME THE ORIFICE SIZE. ALWAYS CHECKAND VERIFY.DO NOT redrill burner orifices. Improper drilling (burrs,out-of-round holes, etc.) can cause excessive burner noise andmisdirection of burner flames. This can result in flameimpingement of the burners and heat exchangers, causingfailure.(5.) Find natural gas heat value and specific gravity inTable 7.(6.) Follow heat value and specific gravity lines to point ofintersection. Find orifice size and manifold pressuresettings for proper operation at given natural gasconditions.EXAMPLE:Heat value 1070 Btu/cu ftSpecific gravity 0.58Therefore; Orifice No. 44 *Manifold pressure 3.6-in. wc* The furnace is shipped with No. 43 orifices. Therefore, inthis example all main burner orifices must be changed andthe manifold pressure must be adjusted.(7.) Proceed to item c to adjust manifold pressure.b. Check gas input rate by clocking gas meter.(1.) Obtain average yearly heat value for local gas supply.(2.) Check and verify orifice size in furnace. NEVERASSUME THE ORIFICE SIZE. ALWAYS CHECKAND VERIFY.(3.) Turn off all other gas appliances and pilots.(4.) Start furnace and let run for 3 minutes.(5.) Measure time (in sec) for gas meter to complete 1revolution.(6.) Refer to Table 8 for cu ft of gas per hr.(7.) Multiply gas rate (cu ft/hr) by heating value (Btu/cuft).EXAMPLE:Btu heating input = Btu/cu ft X cu ft/hrHeating value of gas = 1070 Btu/cu ftTime for 1 revolution of 2-cu ft dial = 72 secGas rate = 100 X 1070 = 107,000 Btuh(8.) Check to make sure that measured gas input does notexceed gas input on unit rating plate.(9.) Proceed to item c to adjust manifold pressure.c. Adjust gas input.(1.) Remove regulator adjustment seal cap. (See Fig. 14.)(2.) Turn adjusting screw counterclockwise to decreaseinput. Turn screw clockwise to increase input. DONOT set manifold pressure less than 3.2-in. wc ormore than 3.8-in. wc for natural gas. Make any majoradjustments by changing main burner orifices.(3.) When correct input is obtained, replace regulatoradjustment seal cap. Main burner flame should beclear blue, almost transparent. (See Fig. 15.)d. High altitude—In the United States, gas input on unit ratingplate is for altitudes up to 2000 ft. Ratings for altitudes over2000 ft must be 4 percent less for each 1000 ft above sealevel. To obtain the adjusted altitude rating, adjust themanifold pressure, item c, and replace the main burnerorifices as needed. Refer to NFGC Appendix F, Table F-4for proper orifice sizing at high altitudes.e. Canadian installations only—The Canadian ratings areapproved for altitudes up to 2000 ft for natural and propanegases. High-altitude ratings are from 2000 ft to 4500 ftabove sea level. See Table 9 for nominal burner orificesize. High-altitude input ratings include a 10 percentderated as required by Canadian standards.2. Set temperature rise.Furnace must operate within range of temperature rise speci-fied on the unit rating plate. Determine the air temperature riseas follows.12