SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB
Specifications subject to change without notice.
12 440 04 4412 01
h. Blower will run for 90 seconds before beginning the
call for heat again.
i. Furnace should ignite normally.
Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify that the jumper is removed from the TEST/TWIN
terminal. Verify that there is nothing plugged into the PLT
connector.
NOTE: If there is a jumper connector plugged into PLT, remove
it and discard. (See Figure 4)
3. Verify that the Blower/Heat Off Delay jumpers are set as
desired. (See Figure 4 and Figure 15)
4. Verify that the blower (lower door in upflow position) and
control (“Main” or upper door in upflow position) doors
are properly installed.
5. Verify that the Status LED heartbeat (bright−dim). If not,
check that the power supply is energized and that the
blower door is secure. See Figure 14 to interpret
diagnostic codes
.
6. Cycle test furnace with room thermostat to be sure that it
operates properly with the room thermostat. Check all
modes including Heat, Cool and Fan.
7. Check operation of accessories per manufacturer’s
instructions.
8. Review Home Owner’s Information with owner.
9. Attach entire literature packet to furnace.
Table 5 COOLING AIR DELIVERY - CFM (with filter
1
)
UNIT
SIZE
RETURN-AIR
CONNECTION
SPEED
TAPS
2
EXTERNAL STATIC PRESSURE (in.w.c.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0401410 SIDE/BOTTOM
Black 1160 1120 1070 1020 965 905 835 765 695 630
Blue 970 940 905 865 825 770 715 655 585 515
Yellow 920 890 855 820 770 720 665 600 545 465
Red 730 705 670 630 580 535 495 445 380 335
0401712 SIDE/BOTTOM
Black 1310 1255 1205 1150 1100 1045 985 930 870 805
Yellow 1215 1165 1120 1070 1025 970 915 860 800 740
Orange 1065 1030 1000 960 920 875 830 780 725 670
Blue 1005 980 950 920 880 840 790 745 695 640
Red 750 740 720 700 670 640 615 585 550 500
0601412 SIDE/BOTTOM
Black 1295 1265 1230 1195 1155 1110 1055 990 895 795
Blue 1035 1010 980 940 905 865 805 740 655 580
Yellow 965 940 915 885 855 805 750 685 610 530
Red
5
760 735 705 675 630 570 520 470 405 335
0601716 SIDE/BOTTOM
Black 1760 1705 1635 1575 1505 1430 1355 1270 1180 1090
Yellow 1415 1400 1365 1335 1290 1240 1180 1115 1040 965
Orange 1065 1060 1050 1035 1010 975 940 890 835 770
Blue 1010 1000 990 975 955 925 885 845 785 720
Red 770 745 730 710 685 660 625 585 545 500
0801716 SIDE/BOTTOM
Black 1800 1770 1735 1685 1630 1570 1495 1415 1330 1230
Yellow 1445 1430 1410 1385 1350 1305 1255 1195 1120 1045
Orange 1250 1240 1225 1200 1170 1130 1090 1040 975 910
Blue 1090 1080 1060 1035 1010 970 930 885 835 765
Red
5
880 860 835 810 780 750 710 665 615 560
0802120
BOTTOM or
TWO-SIDES
3,4
Black 2310 2235 2140 2050 1960 1860 1755 1650 1535 1430
Yellow 1720 1700 1670 1625 1570 1505 1435 1360 1275 1185
Orange 1515 1500 1480 1445 1405 1350 1290 1225 1155 1075
Blue 1150 1135 1105 1080 1050 1020 980 935 880 815
Red 945 915 885 860 835 805 770 720 670 610
1002116 SIDE/BOTTOM
Black 1725 1700 1665 1620 1570 1510 1445 1365 1265 1160
Blue 1500 1475 1450 1410 1370 1330 1260 1180 1095 1010
Yellow
5
1235 1215 1190 1160 1120 1075 1020 950 880 805
Red
5
1035 1005 955 915 875 825 770 715 650 575
1002122
BOTTOM or
TWO-SIDES
3,4
Black 2690 2595 2490 2390 2280 2170 2050 1930 1810 1675
Yellow 2180 2145 2095 2045 1980 1905 1820 1725 1615 1490
Orange 1790 1795 1785 1765 1735 1690 1630 1555 1460 1350
Blue 1640 1640 1635 1620 1595 1565 1510 1450 1365 1270
Red 1365 1360 1360 1345 1330 1300 1265 1215 1155 1080
1202422
BOTTOM or
TWO-SIDES
3,4
Black 2645 2545 2445 2340 2230 2110 1990 1810 1685 1580
Blue 2430 2355 2275 2185 2090 1980 1850 1700 1600 1500
Yellow 1850 1825 1795 1760 1705 1625 1540 1465 1380 1280
Orange 1610 1595 1575 1550 1500 1455 1405 1345 1270 1185
Red
5
1445 1430 1405 1380 1350 1315 1265 1215 1150 1075
NOTE:
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 accessory
filter rack. See accessory list. To determine airflow performance without this filter, assume an additional 0.1 in. w.c. available external static pressure.
2. Blower speed taps are not always in the same order. Factory Default blower connections are as follows:
Heating airflow − BLUE (also used for Continuous Fan)
Cooling airflow − BLACK (enabled when the Y terminal is energized)
ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH INSTALLATION.
3. Airflows over 1800 CFM require bottom return, two−side return, or bottom and side return. A minimum filter size of 20” x 25” (508 x 635 mm) is required.
4. 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.
5. Highlighted areas indicate that this airflow range is beyond the range allowed for heating. THESE AIRFLOW RANGES MAY ONLY BE USED FOR COOLING.
6. All airflows that are shown in BOLD exceed 0.58 Watts per CFM at the given external static pressure.
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