International comfort products N8MXL Installation Instructions Manual page 17

WIRE-
LEAD­
UNIT SIZE
COLOR
Gray
Yellow
Orange
0451412
Blue
Red
Gray
Yellow
Blue
0701712
Orange
Red
Gray
Yellow
Blue
0701716
Orange
Red
Gray
Yellow
Blue
0901714
Orange
Red
Gray
Blue
Yellow
0902116
Orange
Red
Gray
Yellow
Blue
1102120
Orange
Red
Gray
Blue
Yellow
1352420
Orange
Red
NOTES:
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. ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH
INSTALLATION.
3. Highlighted areas indicate airflow range is beyond the range allowed for heating. THESE AIRFLOW RANGES MAY ONLY BE
USED FOR COOLING.
−− Indicates unstable operating conditions.
NOMINAL IRON
PIPE
SIZE IN. (mm)
1/2 (13)
3/4 (19)
1 (25)
1−1/4 (32)
1−1/2 (38)
* Cubic ft. of natural gas per hr for gas pressures of 0.5 psig (14−in. w.c.) or less and a pressure drop of 0.5−in. w.c. (based on a 0.60 specific gravity
gas). Ref: Chapter 6 ANSI Z223−2012/NFPA 54−2012.
Piping should be pressure and leak tested in accordance with
NFGC in the United States, local, and national plumbing and
gas codes before the furnace has been connected. After all
connections have been made, purge lines and check for
leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14−in. w.c.), gas supply pipe
must be disconnected from furnace and capped before and
during supply pipe pressure test. If test pressure is equal to or
less than 0.5 psig (14−in. w.c.), turn off electric shutoff switch
441 01 1421 01
Table 5 – Air Delivery − CFM (With Filter)*
Test Airflow Delivery @ Various External Static Pressures
SPEED
0.1 0.2
5 1230 1190
4 980 945
3 770 720
2 710 660
1 600 540
5 1185 1140
4 1000 940
3 990 935
2 855 775
1 860 685
5 1610 1565
4 1385 1335
3 1215 1165
2 1175 1130
1 1080 1015
5 1355 1320
4 1295 1255
3 1220 1185
2 1030 985
1 3 945 905
5 1625 1580
4 1440 1395
3 1425 1380
2 1260 1210
1 3 1095 1040
5 2255 2205
4 1600 1525
3 1945 1890
2 1420 1340
1 1280 1205
5 2065 2005
4 1825 1760
3 1760 1690
2 1620 1550
1 3 1325 1260
Table 6 – Maximum Capacity of Pipe*
INTERNAL
DIAMETER
In. (mm)
0.622 (16)
0.824 (21) 360 (110)
1.049 (27) 680 (207)
1.380 (35) 1400 (427)
1.610 (41) 2100 (640)
Specifications are subject to change without notice.
0.3 0.4 0.5
1155 1120 1080
920 890 855
685 640 600
620 580 540
500 455 415
1095 1055 1005
895 850 800
895 845 790
720 660 605
515 445 385
1525 1475 1435
1290 1250 1205
1120 1075 1035
1085 1035 990
955 920 875
1285 1245 1210
1220 1185 1140
1150 1105 1065
940 900 845
855 800 750
1535 1490 1445
1350 1305 1255
1335 1290 1235
1160 1105 1050
980 905 845
2150 2100 2040
1465 1400 1335
1830 1770 1715
1280 1200 1140
1140 1055 990
1940 1875 1810
1695 1630 1560
1625 1555 1485
1480 1405 1335
1185 1100 1025
LENGTH OF PIPE − FT. (M)
10 20
175 (53) 120 (37)
250 (76)
465 (142)
950 (290)
1460 (445)
located on furnace gas control valve and accessible manual
equipment shutoff valve before and during supply pipe
pressure test. After all connections have been made, purge
lines and check for leakage at furnace prior to operating
furnace.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate
with the furnace burners ON and OFF.
(in. w.c.)
0.6 0.7 0.8
1045 1010 975
815 770 735
560 520 475
490 455 415
385 345 305
960 915 865
750 695 650
740 690 640
560 495 435
340 275 205
1395 1350 1305
1165 1125 1075
985 940 895
945 900 855
820 780 725
1165 1125 1080
1100 1055 1005
1025 975 915
790 715 655
670 600 540
1395 1340 1260
1200 1145 1090
1185 1125 1075
990 935 880
780 720 650
1985 1920 1835
1275 1210 1150
1655 1600 1545
1065 1005 925
910 840 760
1740 1670 1600
1490 1420 1350
1415 1345 1275
1260 1195 1130
955 885 805
30 40
97 (30) 82 (25)
200 (61) 170 (52)
375 (114) 320 (98)
770 (235) 660 (201)
1180 (360) 990 (301)
0.9 1
935 895
690 645
430 385
375 335
235 −−
820 780
600 555
590 535
385 335
−− −−
1260 1215
1025 980
845 840
805 760
670 620
1025 815
955 815
840 740
590 535
490 435
1135 995
1040 950
1020 940
820 755
585 520
1735 1615
1080 1015
1480 1430
865 790
695 630
1530 1470
1275 1205
1200 1130
1065 995
735 670
50
73 (22)
151 (46)
285 (87)
580 (177)
900 (274)
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