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2. Return air is through side opposite motor (left side). 3. Motor voltage at 115 V. * Input / CFM / Cabinet Width (A=14-1/2, B=17-1/2, C=21, D=24-1/2). TABLE 2: Blower Performance CFM - Upflow (without filter) - Left Side Return MODELS Input / CFM Speed Two Stage Left Side Airflow Data (SCFM) Ext. Static Pressure (in. H2O) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 (F,L)C8T060A12UH11 High 1770 1690 1630 1560 1490 1390 1290 1190 1050 920 Medium High 1400 1380 1350 1320 1280 1230 1160 1060 930 780 Medium Low 1120 1130 1150 1130 1120 1080 1000 950 790 630 Low 880 900 900 900 880 850 790 730 660 530 (F,L)C8T080A12UH11 High 1790 1720 1670 1590 1530 1450 1350 1260 1140 1000 Medium High 1420 1370 1350 1320 1280 1230 1170 1090 990 840 Medium Low 1080 1120 1110 1100 1080 1040 1000 920 820 690 (F,L)C8T080B16UH11 Low N/A 900 900 890 870 850 800 730 670 560 High 2000 1960 1930 1900 1800 1760 1710 1640 1550 1460 Medium 1440 1440 1430 1420 1400 1380 1340 1300 1220 1150 Low 1220 1230 1230 1230 1200 1190 1170 1160 1110 1050 FC8T100B12UH11 High 1780 1710 1640 1560 1490 1390 1290 1180 1030 820 Medium High 1430 1410 1370 1340 1280 1220 1140 1040 890 730 Medium Low 1140 1170 1150 1120 1080 1040 970 890 760 630 Low 920 940 950 940 920 890 850 770 660 560 (F,L)C8T100C20UH11 High 2770 2670 2610 2540 2450 2340 2210 2070 1890 1730 Medium High 2120 2060 2030 2000 1950 1880 1810 1720 1580 1370 Medium Low 1690 1660 1630 1610 1560 1490 1420 1350 1240 1070 Low 1390 1370 1330 1290 1250 1200 1120 1010 910 850 FC8T120C16UH11 High 2160 2070 1990 1900 1800 1690 1580 1430 1260 1000 Medium 1760 1720 1690 1630 1560 1480 1390 1250 1080 890 Low 1510 1490 1470 1440 1380 1300 1210 1110 950 780 FC8T120C16UH11 High 2740 2650 2560 2480 2380 2280 2170 1990 1840 1650 Medium High 2120 2090 2040 2000 1940 1870 1780 1680 1550 1370 Medium Low 1690 1670 1650 1610 1560 1510 1440 1310 1160 1030 Low 1390 1360 1330 1300 1250 1190 1100 1020 940 840 Field Wiring for Single Stage Thermostat BLK WHT GRN BLK (HOT) WHT (NEUTRAL) GRN NOMINAL 120 VOLT Y W1 R G C Y1 Y2 Y W1 W W2 R G C SINGLE STAGE THERMOSTAT T’STAT COMMON CONNECTION Field Wiring for Two Stage Thermostat X/L C G R W2W1Y2 Y1 Y1 Y2 R C X/L INTEGRATED CONTROL T’STAT COMMON CONNECTION TWO-STAGE THERMOSTAT OUTDOOR UNIT 036-21603-002 Rev. A (1004) FILTER PERFORMANCE The airflow capacity data published in the “Blower Performance” table listed above represents blower performance WITHOUT filters. To determine the approximate blower performance of the system, apply the filter drop value for the filter being used or select an appropriate value from the “Filter Performance” table shown below. FILTER PERFORMANCE - PRESSURE DROP INCHES W.C. NOTE: The filter pressure drop values in the “Filter Performance” table shown below are typical values for the type of filter listed and should only be used as a guideline. Actual pressure drop ratings for each filter type vary between filter manufacturer. Airflow Range Minimum Opening Size Filter Type Disposable WASHABLE FIBER* Pleated 1 Opening 2 Openings 1 Opening 2 Openings 1 Opening 2 Openings 1 Opening 2 Openings CFM In. In. inwc inwc inwc inwc inwc inwc 0 - 750 230 0.01 0.01 0.15 751 - 1000 330 0.05 0.05 0.2 1001 - 1250 330 0.1 0.1 0.2 1251 - 1500 330 0.1 0.1 0.25 1501 - 1750 380 658 0.15 0.09 0.14 0.08 0.3 0.17 1751 - 2000 380 658 0.19 0.11 0.18 0.1 0.3 0.17 2001 & Above 463 658 0.19 0.11 0.18 0.1 0.3 0.17 * Washable fiber are the type supplied with furnace (if supplied). APPLYING FILTER PRESSURE DROP TO DETERMINE SYSTEM AIRFLOW To determine the approximate airflow of the unit with a filter in place, follow the steps below: 1. Select the filter type. 2. Select the number of return air openings or calculate the return opening size in square inches to determine the proper filter pressure drop. 3. Determine the External System Static Pressure (ESP) without the filter. 4. Select a filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 3 to determine the total system static. 5. If total system static matches a ESP value in the airflow table (i.e. 0.20 w.c. (50 Pa), 0.60 w.c. (150 Pa), etc,) the system airflow corresponds to the intersection of the ESP column and Model/Blower Speed row. 6. If the total system static falls between ESP values in the table (i.e. 0.58 w.c. (144 Pa), 0.75 w.c. (187 Pa), etc.), the static pressure may be rounded to the nearest value in the table determining the airflow using Step 5 or calculate the airflow by using the following example. Example: For a 130,000 BTUH (38.06 kW) furnace with 2 return openings and operating on high-speed blower, it is found that total system static is 0.58” w.c. To determine the system airflow, complete the following steps: Obtain the airflow values at 0.50 w.c. (125 Pa) & 0.60 w.c. (150 Pa) ESP. Airflow @ 0.50”: 2125 CFM (60.17 m3/min) Airflow @ 0.60”: 2035 CFM (57.62 m3/min) Subtract the airflow @ 0.50 w.c. (125 Pa) from the airflow @ 0.60 w.c...

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