Carrier 48NLT - 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
Lowt,
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
1 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, NMT030
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
Lowt,
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
Lowt,
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 i 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
Lowt,
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
Lowt,
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
Lowt,
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
Lowt,
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 1110
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
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