Carrier 48NLT Installation, Start-up And Service Instructions Manual

Also see for 48NET: Installation, Start-Up and Service Instructions

Table 9 — Dry Coil Air Delivery (Cfm)*at Indicated External Static Pressure and Voltage— Vertical Discharge {Without Filter)48V-PH-HZ MOTORSPEED208 V 230 V or 460 Vin. wg 0.0 0.1 0.2 0.3 0.4 0.5 0.0 0.1 0.2 0.3 0.4 0.5NLT018, NLT024NHT024208/230-1-60Lowt,Med* **Watts 451 417 397 373 355 338 491 467 447 423 405 388Cfm 1138 1102 1045 996 942 889 1196 1161 1101 1050 993 932Hi 1 Watts 491 463 454 420 400 382 541 513 494 470 450 432Cfm 1308 1234 1162 1084 1020 951 1379 1301 1225 1143 1075 1002NLT030, NMT030208/230-1-60Lowf,Med**Watts 509 497 482 467 445 421 559 547 ; 532 517 495 471Cfm 1155 1138 1120 1104 1073 1031 1218 1200 1182 1165 1132 1088Hi Watts 600 582 561 539 512 473 650 632 611 589 562 523Cfm 1411 1362 1326 1249 1195 1133 1493 1457 1412 1358 1274 1218NHT030, NLT036NMT036, NLT042NMT042208/230-1-60208/230-3-60460-3-60ttLowt,Med**Watts 522 504 485 663 440 422 600 573 555 523 491 470Cfm ^ 1494 1430 1358 1273 1174 1058 1574 1507 1431 1341 1237 1115Hi Watts 651 631 610 575 540 517 695 680 658 624 590 563Cfm 1683 1615 1536 1440 1274 1153 1763 1700 1619 1492 1343 1215NET036, NET042208/230-1-60208/230-1-60460-3-60ttLowt,Med**Watts 833 792 765 725 700 650 880 850 810 790 745 710Cfm 1653 1611 1569 1518 1473 1373 1805 1748 1692 1650 1582 1475Hi Watts 945 915 890 865 805 770 1005 965 935 i 900 865 820Cfm 1895 1839 1803 1740 1029 1532 1971 1899 1830 1762 1673 1568NHT036, NVT036NHT042, NVT042208/230-1-60208/230-3-60460-3-60ttLowt,Med**Watts 680 645 610 580 545 510 705 670 640 595 570 535Cfm 1797 1709 1620 1547 1448 1315 1855 1707 1684 1574 1498 1361Hi Watts 750 715 680 650 615 585 795 765 735 700 670 640Cfm 1885 1779 1704 1608 1507 1404 1906 1821 1722 1623 1533 1410NLT048, NHT048NMT048208/230-1-60208/230-3-60460-3-60ttLowt,Med**Watts 710 680 650 600 570 520 740 705 665 635 600 560Cfm 1833 1768 1700 1599 1505 1390 1918 1849 1752 1670 1561 1442Hi Watts 785 750 720 685 650 : 610 835 805 770 735 705 670Cfm 1957 1873 1786 1699 1598 1495 1997 1907 1817 1713 1618 1506NVT048208/230-1-60208/230-3-60460-3-60ttLowt,Med**Watts 965 915 875 840 800 770 1025 985 935 900 870 830Cfm 1878 1821 1767 ' 1716 1654 1584 2060 1996 1921 1075 1030 995Hi Watts 1130 1097 1026 985 970 915 1200 1165 1120 1075 1030 995Cfm 2199 2134 2095 1960 2060 1799 2280 2213 2168 2019 1921 1856NLT060, NMT060NHT060, NVT060208/230-1-60208/230-3-60460-3-60ttLowt,Med**Watts 1095 1025 985 950 910 875 1175 1095 1065 1030 1000 960Cfm 2125 2165 2005 1950 1887 1830 2225 2170 2110 2050 1987 1930Hi Watts 1190 1145 1095 1050 1010 975 1280 1230 1190 1140 1110Cfm 2325 2255 2187 2120 2050 1975 2437 2365 2390 2220 2145 2075*Air delivery values are without air filter and are for dry coil. See Table 10 for wet coil pressure dropDeduct field-supplied air filter pressure drop and wet coil pressure drop to obtain external staticpressure available for ducting.tFactory blower-motor speed setting for heating operation.**Factory blower-motor speed setting for cooling operation.tfDo not change blower speed settings for units with 460-v (high speed only).NOTE: Do not operate the unit at a cooling airflow that is less than 350 cfm per each 12,000 Btuh ofrated cooling capacity. Evapoprator coil icing may occur at airflows below this point. Water blow-offmay occur at airflows above 450 cfm per 12,000 Btuh of rated cooling capacityUNIT CONTROLS —All compressors have the followinginternal-protection controls:1. High-Pressure Relief Valve — This valve opens whenthe pressure differential between the low and high sidebecomes excessive,2. Compressor Overload — This overload interrupts powerto the compressor when either the current or internal tem¬perature become excessive, and automatically resets whenthe internal temperature drops to a safe level.This overload may require up to 60 minutes (or longer)to reset; therefore, if the internal overload is suspected ofbeing open, disconnect the electrical power to the unit andcheck the circuit through the overload with an ohmmeter orcontinuity tester.COOLING SEQUENCE OF OPERATIONNOTE: Although the actual unit wiring may vary slightlyfrom that shown in Fig. 13 and 14, the sequence of opera¬tion will not be affected.With the room thermostat SYSTEM switch in the COOLposition and the FAN switch in the AUTO, position, thecooling sequence of operation is as follows:When the room temperature rises to a point that is slightlyabove the cooling control setting of the thermostat, the ther¬mostat completes the circuit between thermostat terminal R19