ICP F9MXT0401410A Service And Technical Support Manual

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ICP F9MXT0401410A Service And Technical Support Manual Manual pdf 12 page image

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXTSpecifications subject to change without notice.12 440 04 4321 04Table 6 AIR DELIVERY - CFM (with filter1)UNITSIZE RETURN-AIRCONNECTIONSPEEDTAPS2 EXTERNAL STATIC PRESSURE (IN.W.C.)0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00401410 SIDE/BOTTOMGray 1120 1080 1030 980 925 875 820 760 690 630Yellow 880 845 810 780 740 710 680 640 615 570Blue 695 665 620 575 535 495 455 420 370 280Orange 640 595 540 495 460 420 370 310 260 230Red 570 525 475 425 385 330 255 220 - 6 - 60601714 SIDE/BOTTOMGray 1720 1670 1620 1565 1505 1440 1375 1295 1220 1135Yellow 1325 1285 1255 1220 1185 1145 1115 1075 1040 1000Blue 1010 970 925 875 835 785 745 690 660 620Orange 1160 1115 1080 1045 1000 960 920 875 840 785Red 785 715 655 595 530 490 435 385 340 2850801716 SIDE/BOTTOMGray 1810 1770 1720 1665 1610 1540 1475 1400 1315 1235Yellow 1535 1500 1475 1435 1405 1370 1340 1310 1245 1160Blue 1380 1340 1305 1270 1240 1200 1165 1130 1090 1050Orange 1180 1130 1095 1060 1015 975 935 895 850 800Red 1100 1045 1010 970 920 885 845 790 745 6900802120 BOTTOM orTWO-SIDES 4, 5Gray 2290 2225 2155 2090 2015 1930 1845 1750 1640 1515Yellow 1810 1760 1725 1685 1640 1600 1555 1520 1480 1415Blue 1385 1340 1285 1240 1200 1140 1090 1050 995 950Orange 1560 1520 1475 1430 1385 1335 1295 1240 1200 1150Red 1055 985 910 860 795 750 680 615 565 4951002120 BOTTOM orTWO-SIDES 4, 5Gray 2340 2295 2250 2195 2110 2030 1935 1835 1725 1605Yellow 1950 1900 1855 1800 1755 1705 1655 1605 1560 1485Blue 1750 1700 1650 1605 1555 1500 1455 1395 1350 1300Orange 1570 1520 1460 1410 1350 1300 1240 1195 1140 1095Red 1350 1280 1225 1155 1105 1045 1000 950 895 8301202422 BOTTOM orTWO-SIDES 4, 5Gray 2275 2230 2185 2130 2055 1950 1825 1710 1610 1500Yellow 1875 1820 1770 1720 1660 1600 1550 1505 1450 1390Blue 2170 2125 2075 2025 1975 1900 1790 1695 1590 1470Orange 3 1475 1420 1350 1280 1215 1165 1105 1050 995 930Red 3 1625 1565 1505 1445 1385 1325 1275 1225 1170 1130NOTE:1. A filter is required for each return−air inlet. Airflow performance includes a 3/4 in. (19 mm) washable filter media such as contained in factory−authorized accessoryfilter rack. See accessory list. To determine airflow performance without this filter, assume an additional 0.1 in. W.C. available external static pressure.2. ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH INSTALLATION.3. Shaded areas indicate that this airflow range is BELOW THE RANGE ALLOWED FOR HIGH−STAGE HEATING OPERATION. THESE AIRFLOW RANGES MAYONLY BE USED FOR LOW−STAGE HEAT OR COOLING.4. Airflows over 1800 CFM require bottom return, two−side return, or bottom and side return. A minimum filter size of 20” x 25” is required.5. For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return.6. The ”−” entry indicates an unstable operating condition.Check Safety ControlsThe flame sensor, gas valve, and pressure switch were allchecked in the Start−up procedure section as part of normaloperation.1. Check Main Limit SwitchThis control shuts off combustion system and energizesair−circulating blower motor, if furnace overheats. Byusing this method to check the temperature limit control,it can be established that the limit is functioning properlyand that the limit will operate if there is a restrictedreturn−air supply or motor failure. If the limit control doesnot function during this test, the cause must bedetermined and corrected.a. Run furnace for at least 5 minutes.b. Gradually block off return air with a piece ofcardboard or sheet metal until the limit trips.c. Unblock return air to permit normal circulation.d. Burners will re−light when furnace cools down.2. Check Pressure Switch(es)This control proves operation of the draft inducer blower.a. Turn off 115−V power to furnace.b. Disconnect inducer motor lead wires from wireharness.c. Turn on 115−V power to furnace.d. Set thermostat to “call for heat” and wait 1 minute.When pressure switch is functioning properly, hotsurface igniter should NOT glow and controldiagnostic light flashes a status code 3. If hot surfaceigniter glows when inducer motor is disconnected,shut down furnace immediately.e. Determine reason pressure switch did not functionproperly and correct condition.f. Turn off 115−V power to furnace.g. Reconnect inducer motor wires, replace outer door,and turn on 115−V power.h. Blower will run for 90 seconds before beginning thecall for heat again.i. Furnace should ignite normally.Checklist1. Put away tools and instruments. Clean up debris.2. Verify that the jumper is removed from the TEST/TWINterminal. Verify that there is nothing plugged into the PLTconnector.NOTE: Note: If there is a jumper connector plugged into PLT,remove it and discard. (See Figure 14)3. Verify that Heating Operating Mode switch SW−1 is setproperly.. (See Figure 14)4. Verify that the Blower/Heat Off−Delay SW−2 and SW−3switches are set as desired. (See Figure 14)5. Verify that the blower (lower door in upflow position) andcontrol (“Main” or upper door in upflow position) doorsare properly installed.6. Verify that the Status LED glows. If not, check that thepower supply is energized and that the blower door issecure. (See Figure 14) to interpret diagnostic codes.7. Cycle test furnace with room thermostat to be sure that itoperates properly with the room thermostat. Check allmodes including Heat, Cool and Fan.8. Check operation of accessories per manufacturer’sinstructions.9. Review Home Owner’s Information with owner.10. Attach entire literature packet to furnace.