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c. On all units, remove blower assembly from unit. Re-
move screws securing blower to blower partition and
slide assembly out. Be careful not to tear insulation in
blower compartment.
d. Ensure proper reassembly by marking blower wheel and
motor in relation to blower housing before disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft,
remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of
housing.
2. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orientation.
b. Lift wheel from housing. When handling and/or cleaning
blower wheel, be sure not to disturb balance weights
(clips) on blower wheel vanes.
c. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush
attachment. Remove grease and oil with mild solvent.
d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure setscrew(s) are
tightened on motor shaft flats and not on round part of
shaft.
f. Reinstall unit access panel.
3. Restore electrical power, then gas supply to unit. Start unit
and check for proper blower rotation and motor speeds
during heating and cooling cycles.
C. Flue Gas Passageways
To inspect the flue collector box and upper areas of the heat
exchanger:
TABLE 9—WET COIL AIR DELIVERY* — HORIZONTAL AND DOWNFLOW DISCHARGE
UNIT 583B030-060
(DEDUCT 10% FOR 208 VOLTS)
230 AND 460 VOLT
Unit
583B
Motor
Speed
External Static Pressure (in. wg)
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
030
Low
Watts243244242––––––––
Cfm885842786––––––––
Medium
Watts353339333330326320–––––
Cfm 1195 1134 1070 997 911 818 –––––
High
Watts – – – 443 436 426 416 406 397 – –
Cfm – – – 1230 1145 1061 977 888 786 – –
036
Low
Watts 490 463 446 432 418 403 389 378 – – –
Cfm 1431 1398 1347 1281 1205 1118 1024 921 – – –
Medium
Watts – 513 501 488 474 459 443 428 – – –
Cfm – 1491 1426 1351 1267 1175 1077 976 – – –
High
Watts – – 645 636 627 616 605 593 583 – –
Cfm – – 1484 1410 1330 1243 1147 1044 936 – –
042
Low
Watts 634 618 608 598 583 562 534 502 473 454 457
Cfm 1669 1599 1545 1498 1448 1391 1326 1257 1189 1132 1101
Medium
Watts – – – 733 704 672 638 604 574 550 536
Cfm – – – 1746 1688 1630 1566 1492 1399 1279 1120
High
Watts––––––797773751727696
Cfm––––––1727 1632 1537 1423 1308
048
Low
Watts 591 578 573 568 559 544 524 500 – – –
Cfm 1554 1523 1496 1467 1432 1387 1332 1269 – – –
Medium
Watts 755 737 719 699 678 653 627 602 579 562 556
Cfm 1834 1802 1758 1706 1648 1585 1520 1455 1392 1332 1276
High
Watts – – – 890 858 828 801 777 756 734 709
Cfm – – – 1943 1870 1793 1711 1624 1531 1433 1329
060
Low
Watts589576569566559541499––––
Cfm 1946 1891 1836 1779 1718 1651 1577 ––––
Medium
Watts 750 733 715 695 673 648 623 598 577 – –
Cfm 2189 2097 2021 1952 1883 1809 1727 1635 1530 – –
High
Watts – 879 850 821 795 772 750 728 701 – –
Cfm – 2337 2159 2050 1974 1905 1824 1722 1597 – –
*Air delivery values are without air filter.
Note: Deduct field-supplied air filter pressure drop to obtain external static pressure available for ducting.
Fig. 25—Blower Housing and Flue Collector Box
C99022
INDUCED DRAFT MOTOR MOUNT
FLUE
COLLECTOR
BOX
BLOWER
HOUSING
BURNER
RACK
MOUNTING
SCREW
ROLLOUT
SWITCH
—21—