Carrier 542E User Manual download pdf (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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