24
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Installation Instructions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
Furnace
size
Return-air
inlet
Speed
External static pressure (in. WC)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
60B
Bottom or
Sides
H
CFM 1430 1390 1350 1320 1280 1240 1200 1160 1110 1065
Temp Rise-1st stage °F -- -- -- -- -- -- -- 30.7 32.2 33.6
Temp Rise-2nd stage °F 37 37.4 38.6 39.3 40.7 41.7 43.4 45.1 47.1 49.1
Mid-H
CFM 1245 1205 1165 1130 1100 1050 1010 960 920 865
Temp Rise-1st stage °F -- -- 30 31.1 32.1 33.2 35.1 37 38.7 40.4
Temp Rise-2nd stage °F 42.7 43.4 45 46.5 48.3 50.1 52.6 55.1 58 --
Mid
CFM 1075 1035 1000 955 910 860 820 780 730 685
Temp Rise-1st stage °F 32.1 33.4 35.5 37.6 39.3 41 43.1 45.1 48.2 51.3
Temp Rise-2nd stage °F 49.4 52.9 55.4 58 -- -- -- -- -- --
Mid-L
CFM 885 830 780 735 690 650 590 550 520 470
Temp Rise-1st stage °F 39.1 41.7 44.9 48 51.2 54.5 59.1 -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
Low
CFM 780 707 640 579 500 466 403 356 320 253
Temp Rise-1st stage °F 48.3 52.8 58 -- -- -- -- -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
80B
Bottom or
Sides
H
CFM 1411 1374 1339 1303 1271 1233 1190 1148 1102 1054
Temp Rise-1st stage °F -- -- -- 35.5 36.4 37.5 38.8 40.3 41.9 43.8
Temp Rise-2nd stage °F 50.5 51.8 53.2 54.6 56.0 57.8 59.8 62.0 64.6 --
Mid-H
CFM 1215 1178 1144 1108 1071 1029 985 945 898 854
Temp Rise-1st stage °F 38.0 39.2 40.4 41.7 43.2 44.9 46.9 48.9 51.5 54.2
Temp Rise-2nd stage °F 56.6 58.4 60.2 62.3 64 -- -- -- -- --
Mid
CFM 1044 1002 968 931 886 841 805 767 718 677
Temp Rise-1st stage °F 40.8 43.4 45.8 50.5 50.9 54.0 57.6 60.8 64.4 --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
Mid-L
CFM 825 790 743 698 649 608 457 527 491 463
Temp Rise-1st stage °F 50.5 53.7 58.4 62.9 -- -- -- -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
Low
CFM 786 720 645 598 539 503 436 385 348 302
Temp Rise-1st stage °F 56.8 62.2 -- -- -- -- -- -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
80C
Bottom or
Sides
H
CFM 1516 1467 1418 1367 1312 1261 1201 1144 1086 1029
Temp Rise-1st stage °F -- -- -- -- 35.1 36.2 38 39.8 41.6 43.3
Temp Rise-2nd stage °F 46.7 47.4 48.8 50.1 52.5 54.8 57.4 59.9 62.7 --
Mid-H
CFM 1316 1259 1203 1149 1092 1031 976 909 855 791
Temp Rise-1st stage °F 35 37 38.2 39.4 41.1 42.7 45.2 47.7 50.9 54
Temp Rise-2nd stage °F 53.8 53.2 55.8 58.4 62 -- -- -- -- --
Mid
CFM 1142 1076 1014 960 894 823 765 702 651 597
Temp Rise-1st stage °F 40.3 43.1 45.4 47.7 51.2 54.6 58.2 61.8 -- --
Temp Rise-2nd stage °F 60 61.1 -- -- -- -- -- -- -- --
Mid-L
CFM 901 829 767 692 625 562 506 463 409 345
Temp Rise-1st stage °F 49 49.9 55.7 61.5 -- -- -- -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
Low
CFM 800 674 618 498 455 400 360 300 240
Temp Rise-1st stage °F 57 -- -- -- -- -- -- -- -- --
Temp Rise-2nd stage °F -- -- -- -- -- -- -- -- -- --
Table 4 Air Delivery - CFM (Without Filter) * **
* A filter is required for each return air inlet. This table shows the airflow
performance without a filter. To determine airflow performance with a filter, if a
3/4 inch (19 mm) washable media filter is used, assume an additional 0.1 in. WC
available external static pressure.
**
The manufacturer default fan settings are based on model, refer to Table 24.
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