Carrier 48NLT - Manual (Page 19)

Table 9 - Dry Coil Air Delivery (Cfm)*
at Indicated External Static Pressure and Voltage
— Vertical Discharge (Without Filter)
48
V-PH-HZ
MOTOR
SPEED
208 V 230 V or 460 V
in. wg 0.0 0.1 0.2 0.3 0.4 0.5 0.0 0.1 0.2 0.3 0.4 0.5
NLT018, NLT024
NHT024
208/230-1-60
Lowf,
Med* ** Watts 451 417 397 373 355 338 491 467 447 423 405 388
Cfm 1138 1102 1045 996 942 889 1196 1161 1101 1050 993 932
Hi
Watts 491 463 454 420 400 382 541 513 494 470 450 432
Cfm 1308 1234 1162 1084 1020 951 1379 1301 1225 1143 1075 1002
NLT030, NI\/1T030
208/230-1-60
Lowf,
Med** Watts 509 497 482 467 445 421 559 547 532 517 495 471
Cfm 1155 1138 1120 1104 1073 1031 1218 1200 1182 1165 1132 1088
Hi
Watts 600 582 561 539 512 473 650 632 611 589 562 523
Cfm 1411 1362 1326 1249 1195 1133 1493 1457 1412 1358 1274 1218
NHT030, NLT036
NMT036, NLT042
NMT042
208/230-1-60
208/230-3-60
460-3-60tt
Lowf,
Med** Watts 522 504 485 663 440 422 600 573 555 523 491 470
Cfm 1494 1430 1358 1273 1174 1058 1574 1507 1431 1341 1237 1115
Hi
Watts 651 631 610 575 540 517 695 680 658 624 590 563
Cfm 1683 1615 1536 1440 1274 1153 1763 1700 1619 1492 1343 1215
NET036, NET042
208/230-1-60
208/230-1-60
460-3-60tt
Lowf,
Med** Watts 833 792 765 725 700 650 880 850 810 790 745 710
Cfm 1653 1611 1569 1518 1473 1373 1805 1748 1692 1650 1582 1475
Hi
Watts 945 915 890 865 805 770 1005 965 935 900 865 820
Cfm 1895 1839 1803 1740 1029 1532 1971 1899 1830 1762 1673 1568
NHT036, NVT036
NHT042, NVT042
208/230-1-60
208/230-3-60
460-3-60tt
Lowf,
Med** Watts 680 645 610 580 545 510 705 670 640 595 570 535
Cfm 1797 1709 1620 1547 1448 1315 1855 1707 1684 1574 1498 1361
Hi
Watts 750 715 680 650 615 585 795 765 735 700 670 640
Cfm 1885 1779 1704 1608 1507 1404 1906 1821 1722 1623 1533 1410
NLT048, NHT048
NMT048
208/230-1-60
208/230-3-60
460-3-60tt
Lowf,
Med** Watts 710 680 650 600 570 520 740 705 665 635 600 560
Cfm 1833 1768 1700 1599 1505 1390 1918 1849 1752 1670 1561 1442
Hi
Watts 785 750 720 685 650 610 835 805 770 735 705 670
Cfm 1957 1873 1786 1699 1598 1495 1997 1907 1817 1713 1618 1506
NVT048
208/230-1-60
208/230-3-60
460-3-60tt
Lowf,
Med** Watts 965 915 875 840 800 770 1025 985 935 900 870 830
Cfm 1878 1821 1767 1716 1654 1584 2060 1996 1921 1075 1030 995
Hi
Watts 1130 1097 1026 985 970 915 1200 1165 1120 1075 1030 995
Cfm 2199 2134 2095 1960 2060 1799 2280 2213 2168 2019 1921 1856
NLT060, NMT060
NHT060, NVT060
208/230-1-60
208/230-3-60
460-3-60tt
Lowf,
Med** Watts 1095 1025 985 950 910 875 1175 1095 1065 1030 1000 960
Cfm 2125 2165 2005 1950 1887 1830 2225 2170 2110 2050 1987 1930
Hi
Watts 1190 1145 1095 1050 1010 975 1280 1230 1190 1140 I l i o 1065
Cfm 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 drop
Deduct field-supplied air filter pressure drop and wet coil pressure drop to obtain external static
pressure 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 of
rated cooling capacity. Evapoprator coil icing may occur at airflows below this point. Water blow-off
may occur at airflows above 450 cfm per 12,000 Btuh of rated cooling capacity
UNIT CONTROLS —All compressors have the following
internal-protection controls:
1. High-Pressure Relief Valve — This valve opens when
the pressure differential between the low and high side
becomes excessive.
2. Compressor Overload — This overload interrupts power
to the compressor when either the current or internal tem­
perature become excessive, and automatically resets when
the 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 of
being open, disconnect the electrical power to the unit and
check the circuit through the overload with an ohmmeter or
continuity tester.
COOLING SEQUENCE OF OPERATION
NOTE; Although the actual unit wiring may vary slightly
from that shown in Fig. 13 and 14, the sequence of opera­
tion will not be affected.
With the room thermostat SYSTEM switch in the COOL
position and the FAN switch in the AUTO, position, the
cooling sequence of operation is as follows:
When the room temperature rises to a point that is slightly
above the cooling control setting of the thermostat, the ther­
mostat completes the circuit between thermostat terminal R
19