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4 Johnson Controls Unitary Products
256819-YTG-J-1208
Air Handler Air Flow Data
HIGH / LOW SPEED COOLING AND HEAT PUMP AIRFLOW
CFM
JUMPER SETTINGS
24B 36C
High Low High Low COOL Tap ADJ Tap
1088 707 1387 905 A B
830 542 1151 753 B B
948 617 1201 783 A A
716 465 1009 657 B A
854 556 1086 703 A C
612 462 953 622 C B
637 460 901 588 B C
531 460 754 493 D B
542 462 831 540 C A
462 462 657 460 D A
474 460 751 494 C C
461 464 588 461 D C
48D 60D JUMPER SETTINGS
High Low High Low COOL Tap ADJ Tap
2138 1442 2364 1545 A B
1759 1162 1962 1271 B B
2009 1311 2123 1374 A A
1612 1052 1763 1146 B A
1773 1166 1905 1237 A C
1530 989 1777 1158 C B
1459 947 1580 1021 B C
1359 886 1596 1030 D B
1388 904 1583 1019 C A
1221 806 1413 929 D A
1244 808 1412 926 C C
1118 715 1277 841 D C
HIGH / LOW SPEED ELECTRIC HEAT AIRFLOW
CFM
JUMPER SETTINGS
24B 36C
High Low High Low HEAT Tap ADJ Tap
1088 828 1387 908 A N / A
954 714 1228 804 B N / A
829 614 1151 756 C N / A
678 523 923 609 D N / A
48D 60D JUMPER SETTINGS
High Low High Low HEAT Tap ADJ Tap
2111 1417 2363 1488 A N / A
1858 1252 2174 1252 B N / A
1480 985 1868 1061 C N / A
1250 840 1387 823 D N / A
1. Airflow at nominal voltage, bottom return at 0.5 external static pressure, tested without filter installed, dry coil conditions.
2. These units have variable speed motors that automatically adjust to provide constant CFM from 0.0” to 0.6” w.c. static pressure.
3. From 0.6” to 1.0” static pressure, CFM is reduced by 2% per 0.1” increase in static.
4. Operation on duct systems with greater than 1.0” w.c. external static pressure is not recommended.
5. Both the COOL and the ADJUST tap must be set to obtain the cooling airflow desired (CFM).
6. The ADJ tap does not affect the HEAT tap setting.
7. Fan only airflow (CFM) = 63% of jumper selected COOL tap and ADJUST tap.
8. Low speed cooling used only with two stage outdoor units. (Speed is preset to 65% of high speed).
9. Dehumidification speed is 85% of jumper selected COOL tap and ADJUST tap.
10. When operating in both heat pump and electric heat modes, the airflow (CFM) will be per HEAT Tap CFM values only.
11. At some settings, LOW COOL and/or LOW HEAT airflow may be lower than what is required to operate an airflow switch on certain
models of electronic air cleaners. Consult the instructions for the electronic air cleaner for further details.
12. Airflow (CFM) indicator light (LED2) flashes once for every 100 CFM (i.e.: 12 Flashes is 1200 CFM) – blinks are approximate +/- 10%.