Carrier 50JS Installation, Start-Up And Service Instructions Manual page 18

UNIT MOTOR SPEED
Watts
Low
Cfm
Watts
024 Med
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
30 Med
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
36 Med
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
42 Med
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
48 Med
Cfm
Watts
High
Cfm
Watts
Low
Cfm
Watts
60 Med
Cfm
Watts
High
Cfm
* Air delivery values are based on operating voltage of 230 v or 460 v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain
static pressure available for ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below
this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
3. Deduct 10% for 208v.
The charging label and the tables shown refer to system tempera-
tures and pressures in cooling mode only. A refrigerant charging
label is attached to the outside of the service access door. If charge
level is suspect in Heating mode, reclaim all refrigerant and charge
to nameplate amount. (This information may be obtained from the
physical data table also.)
IMPORTANT: When evaluating the refrigerant charge, an indi-
cated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as insuf-
ficient airflow across either coil or both coils.
REFRIGERANT CHARGE — The amount of refrigerant charge
is listed on the unit nameplate and /or the physical data table. Refer
to the Refrigeration Service Techniques Manual, Refrigerants
Section.
NO CHARGE — Check for leak. Use standard evacuating tech-
niques. After evacuating system, weigh in the specified amount of
refrigerant (refer to system data plate).
LOW CHARGE COOLING — Use Cooling Charging Charts
(Figs. 23-35). Vary refrigerant until the conditions of the chart are
Table 4B—Wet Coil Air Delivery
Unit 50JX 024-060 (Deduct 10% for 208v)*
0.0 0.1 0.2
275 273 271
923 844 754
- - -
- - -
- - -
- - -
276 276 272
963 929 781
375 377 371
1202 1170 1079
- - -
- - -
462 451 431
1374 1290 1205 1116
523 506 490
1500 1408 1301 1190
- 645 628
- 1474 1369 1267
620 600 586
1662 1621 1581 1540
- - -
- - -
- - -
- - -
620 600 586
1662 1621 1581 1540
763 747 729
1917 1868 1822 1774
- - -
- - - 1982
597 592 578
2265 2190 2101 2033
754 730 707
2383 2282 2202 2134
901 876 856
2480 2383 2301 2233
EXTERNAL STATIC PRESSURE (IN. WG)
0.3 0.4 0.5 0.6
270 - -
669 - -
359 353 350 347
941 876 814 737
- - - 447
- - - 968
- - -
- - -
362 354 350
976 884 807
- 469 449 435
- 1174 988 828
411 394 381
1020 916
471 449 426
1082 977
610 595 584 575
1169 1069 962
574 562 548 530
1496 1447 1392
- 686 661 634
- 1722 1662 1594
- - -
- - -
574 562 548 530
1496 1447 1392
709 686 661 634
1722 1662 1594
852 832 809 784
1914 1839 1757
526 460 452 445
1974 1869 1614
687 671 658 646
2070 2005 1935
836 813 785 755
2175 2122 2066
met. Note that charging charts are different from type normally
used. Charts are based on charging the units to correct superheat
for the various operating conditions. Accurate pressure gage and
temperature sensing devices are required. Connect the pressure
gage to the service port on the suction line. Mount the temperature
sensing device on the suction line and insulate it so that the
outdoor ambient does not effect the reading. Indoor air CFM must
be within the normal operating range of the unit.
TO USE COOLING CHARGING CHARTS — Take the outdoor
ambient temperature and read the suction pressure gage. Refer to
the chart to determine what the suction temperature should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
18
0.7 0.8 0.9
- - - -
- - - -
341 - -
622 - -
439 431 423
869 765 659
- - - -
- - - -
- - - -
- - - -
428 - -
718 - -
- - - -
- - - -
- - - -
- - - -
- - -
- - -
510 487 462
1331 1263 1186
606 577 547
1515 1427 1330
- 757 730 704
- 1669 1577 1486
- 487 -
1331 1263 -
606 577 547
1515 1427 1330
757 730 704
1669 1577 1486
- - -
- - -
630 603 558
1858 1771 1667
723 696 681
1998 1910 1788
1.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
439
1103
517
1227
682
1402
-
-
517
1227
682
1402
-
-
486
1576
687
1619