DEFROST — The defrost control is a time/temperature control
which includes a field-selectable time period (DIP switch 1 and 2
on the board) between defrost cycles of 30, 60, 90, or 120 minutes
(factory set at 30 minutes).
To initiate a forced defrost, two options are available depending on
the status of the defrost thermostat.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screw driver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle, as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released,a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with com-
pressor operation). On return to heating operation, compressor will
Table 4—Wet Coil Air Delivery
Unit 50JZ 024-060 (Deduct 10% for 208v)*
UNIT 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
024
Low
Watts 275 273 271 270 -------
Cfm923844754669-------
Med
Watts - - - 359 353 350 347 341 - - -
Cfm - - - 941 876 814 737 622 - - -
High
Watts ------447439431423-
Cfm------968869765659-
30
Low
Watts 276 276 272 --------
Cfm963929781--------
Med
Watts 375 377 371 362 354 350 -----
Cfm 1202 1170 1079 976 884 807 -----
High
Watts ----469449435428---
Cfm----1174 988 828 718 - - -
36
Low
Watts 462 451 431 411 394 381 -----
Cfm 1374 1290 1205 1116 1020 916 -----
Med
Watts 523 506 490 471 449 426 -----
Cfm 1500 1408 1301 1190 1082 977 -----
High
Watts - 645 628 610 595 584 575 ----
Cfm - 1474 1369 1267 1169 1069 962 ----
42
Low
Watts 660 639 524 611 598 583 564 541 518 495 473
Cfm 1701 1659 1618 1576 1531 1481 1425 1363 1293 1223 1154
Med
Watts -----704675645614582550
Cfm-----1701 1631 1550 1460 1361 1256
High
Watts -------806777749726
Cfm-------1708 1614 1521 1435
48
Low
Watts 620 600 586 574 562 548 530 510 487 - -
Cfm 1662 1621 1581 1540 1496 1447 1392 1331 1263 - -
Med
Watts 763 747 729 709 686 661 634 606 577 547 517
Cfm 1917 1868 1822 1774 1722 1662 1594 1515 1427 1330 1227
High
Watts - - - 852 832 809 784 757 730 704 682
Cfm - - - 1982 1914 1839 1757 1669 1577 1486 1402
60
Low
Watts 597 592 578 526 460 452 445 ----
Cfm 2265 2190 2101 2033 1974 1869 1614 ----
Med
Watts 754 730 707 687 671 658 646 630 603 558 486
Cfm 2383 2282 2202 2134 2070 2005 1935 1858 1771 1667 1576
High
Watts 901 876 856 836 813 785 755 723 696 681 687
Cfm 2480 2383 2301 2233 2175 2122 2066 1998 1910 1788 1619
* Air delivery values are based on operating voltage of 230v or 460v, 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.
Table 5—FILTER PRESSURE DROP
(In. wg)
UNIT SIZE
50JZ
FILTER SIZE
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1599 1600 1700 1800 1900 2000 2100 2200 2300
024, 030 20x20x1 0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15 -----------
036 20x24x1 ----0.09 0.10 0.11 0.13 0.14 0.15 0.16 --------
042, 048, 060 24x30x1 ------ -0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
17
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