Carrier 542E - Manual (Page 11)

TABLE VI-AIR DELIVERY (FtVMin) AT INDICATED EXTERNAL STATIC PRESSURE & VOLTAGE*
Model
Blower
Motor
Speed
Opera­
ting
Voltage
Applica-
tiont
External Static Pressure—Inches wc
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
542E024 Low 208 Heating 880 835 790 740 690 630 565 470
Cooling 850 810 770 725 675 615 550 465
230 Heating 965 925 880 835 780 720 655 575
Cooling 940 900 855 810 755 700 635 560
High 208 Heating 1015 970 920 870 815 750 685 605
Cooling 985 940 890 840 785 730 665 585
230 Heating 1070 1030 985 940 885 830 765 680
Cooling 1040 1000 955 910 855 800 735 660
542E030 Low 208 Heating 995 965 930 890 845 785 705 590
Cooling 980 945 910 865 820 760 680 560
230 Heating 1070 1050 1025 995 960 915 840 730
Cooling 1055 1030 1005 970 930 880 800 680
High 208 Heating 1165 ■ 1145 1125 1095 1065 1020 955 845
Cooling 1150 1130 1105 1075 1035 980 900 770
230 Heating 1260 1245 1225 1200 1165 1125 1065 970
Cooling 1245 1225 1200 1170 1135 1080 1005 875
542E036 Low 208 Heating 1280 1235 1185 1135 1080 1020 955 875
Cooling 1225 1185 1140 1095 1040 985 920 850
230 Heating 1485 1435 1380 1325 1265 1200 1115 1025
Cooling 1400 1350 1300 1250 1190 1125 1050 970
High 208 Heating 1685 1630 1575 1510 1440 1360 1275 1160
Cooling 1565 1510 1455 1395 1325 1250 1160 1045
230 Heating 1850 1785 1720 1650 1575 1490 1395 1280
Cooling 1670 1615 1560 1495 1425 1345 1250 1100
542E042 Low 208 Heating 1400 1360 1315 M265v 1:205: 1130 : 1015- _
Cooling 1370 1330 1280 1230 : 1165 : ■ 1085 955 ■ ■
230 Heating 1655 1610 1560 1505 1435 1360 1270 : 1140
Cooling 1615 1565 1510 1450 1380 1305 1205 1050
High 208 Heating 1895 1840 1780 1715 1645 1570 1480 1365
Cooling 1825 1770 1710 1645 1570 1490 1395 1270
230 Heating 2125 2065 2005 1935 1860 1775 1685 1570
Cooling 2030 1970 1905 1835 1760 1675 1575 1440
542E048 Low 208 Heating 1690 1635 1575 1510 1440 1360 1270 : 1140
Cooling 1650 1595 1535 1475 1405 1325 1,230 1100
230 Heating 1905 1855 1800 1740 1675 1600 1510 :1370
Cooling 1860 1810 1755 1690 1625 1545 1445 1290
High 208 Heating 2005 1955 1900 1845 1780 1705 1625 1510
Cooling 1955 1905 1850 1790 1725 1650 1560 1430
230 Heating 2270 2195 2120 2040 1955 1870 1765 1650
Cooling 2180 2110 2040 1960 1880 1785 1685 1570
460 Heating 2070 2000 1925 1845 1760 1665 1560 1425
Cooling 2000 1930 1855 1775 1690 1595 1490 1355
542E060
(Single-
Low 230 Heating 2250 2205 2160 2110 2050 1990 1915 1830
Cooling 2180 2135 2085 2030 1970 1900 1815 1700
Phase
Units)
High 230 Heating 2700 2625 2550 2465 2380 2285 2175 2055
Cooling 2550 2475 2395 2315 2220 2120 2005 1860
* Deduct field-supplied air filter pressure drop & heater loss (when used) to obtain available external static pressure for ducting,
t Heating airflow values are with a dry coil. Cooling airflow values are with a wet coil.
NOTE: Shaded portions of this table fall below 350ft^/min per 12,000 Btuh of rated cooling capacity. Indoor coil icing may ocur at airflows
below this point. Dashes are used in those areas of the table that fall beyond the capability of the indoor blower motor.
D. Unit Controls
All compressors have the following internal protection con­
trols:
1. High-Pressure Relief VaZue—This valve opens when the
pressure differential between the low and high side
becomes excessive.
2. Compressor Ckterload—This internal overload interrupts
power to the compressor windings when either the cur­
rent or internal temperature become excessive, and au­
tomatically 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 thru
the overload with an ohmmeter or continuity tester.
3. Low-Pressure Switch—This switch with automatic reset
interrupts the compressor control circuit when the
refrigerant high-side pressure becomes too low. It pro­
tects the compressor from damage attributable to loss of
the refrigerant charge.
4. TimelTemperature Defrost System—The defrost control
system consists of a defrost timer, a defrost thermostat
switch, and a defrost relay. The system initiates defrost
cycle operation every 90 minutes if a coil icing condition
exists. See the defrost cycle sequence of operation in
Section VII.
5. Crankcase Heater—This device prevents overdilution of
compressor oil with refrigerant during shutdown
, periods, thereby extending the life of the compressor.
See the crankcase heater sequence of operation in Sec­
tion VII.
6. Compressor Quick-Start Components—These components
are used with all single-phase units to improve com­
pressor starting characteristics.
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