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

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Carrier 58MVP Installation, Start-up, And Operating Instructions Manual Manual pdf 46 page image

CHECK SAFETY CONTROLSThis section covers the safety controls that must be checked beforethe installation is complete. The flame sensor, gas valve, andpressure switches were all checked in the Start-up proceduresection as part of normal operation.Step 1—Check Primary Limit ControlThis control shuts off the gas control system and energizes theair-circulating blower motor if furnace overheats.1. The recommended method of checking this limit control is togradually block off return air after furnace has been operatingfor a period of at least 5 minutes.2. As soon as limit control has shut off burners, a 33 status codewill appear on furnace control.3. The return-air opening should be unblocked to permit normalair circulation.By using this method to check the limit control, it can beestablished that the limit is functioning properly and the furnacewill operate safely if there is a restricted return-air duct or motorfailure. If the limit control does not function during this test, thecause must be determined and corrected.Step 2—Check Pressure SwitchesThis control proves operation of the draft inducer. Check switchoperation as follows:1. Turn off 115-v power to furnace.2. Remove control access door and disconnect inducer motor12-pin wire harness at inducer motor.3. Turn on 115-v power to furnace.4. Set thermostat to ″call for heat.″ When pressure switches arefunctioning properly, status code 42 will flash on furnacecontrol approximately 20 sec after thermostat switch is closed.If either a status code 31 or 32 is flashed when inducer motoris disconnected, the furnace will shut itself down immediately.Determine the reason pressure switches did not functionproperly and correct the condition.5. Turn off 115-v power to furnace.6. Reconnect inducer motor wire harness. Reinstall furnaceaccess door.7. Turn on 115-v power to furnace.8. Reset thermostat to desired temperature.Fig. 62—Redundant Automatic Gas ValveA97386ON/OFFSWITCHINLETPRESSURETAPONOFFBURNERENCLOSUREREFERENCEPRESSURE TAP MANIFOLDPRESSURETAPLOW-FIREADJUSTMENTALLEN SCREW(UNDER CAP)HIGH-FIREADJUSTMENTALLEN SCREW(UNDER CAP)DO NOT redrill orifices. Improper drilling (burrs, out-of-round holes, etc.) can cause excessive burner noise andmisdirection of burner flames. This can result in flameimpingement of burners and heat exchangers, causing fail-ures. (See Fig. 63.)A93059Fig. 63—Burner OrificeBURNERORIFICEFig. 64—Burner FlameA89020BURNER FLAMEBURNERMANIFOLDTable 12—Altitude Derate Multiplier for U.S.A.ALTITUDE(FT)% OFDERATEDERATE MULTIPLIERFACTOR FOR U.S.A.*0—2000 0 1.002001—3000 4—6 0.953001—4000 6—8 0.934001—5000 8—10 0.915001—6000 10—12 0.896001—7000 12—14 0.877001—8000 14—16 0.858001—9000 16—18 0.839001—10,000 18—20 0.81* Derate multiplier factor is based on midpoint altitude for altitude range.46→

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