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4. A field check-out of the defrost control board can be made by the following steps:
1. Attach a "jumper"wire across the two terminals of the sensor wires (see wiring diagrams on
pages 11 through 14 showing the sensor being wired to the =COM" terminal of the defrost
control board).
=
1
Attach a "jumper" wire across the two "TST" terminals. The timing cycles are divided by a
factor of 256. (e.g. 90 minutes is reduced to 21.1 seconds, 60 minutes to 14 seconds and 30
minutes to 7 seconds). At "T1" setting the unit should go into defrost in 7 seconds.
For this test, the unit will stay in "defrost" for only about 2 to 3 seconds due to the 10 minute
override. (L_. = 2.3 seconds)
TST HLD 24V OUT COM (_)
°°° H flfl H
0
T3
0
T2 T1.
JUMPER WIRE
FIGURE 3
T3 = 90, T2 = 60, T1 = 30
-7-