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TM 9-4110-257-14
4-8. PRELIMINARY ADJUSTMENT OF EOUIPMENT. - Continued
NOTE
The repeat cycle timer controls are marked T1 and
T2. Control T1 adjusts the length of time the
refrigeration unit will operate continuously before
initiating a defrost cycle. Control T2 adjusts the
maximum length of time the refrigeration unit will
remain in the defrost cycle.
The
timer
scales
indicate
an
approximate
percentage of time based upon a 24 hours. For
example, to set the timer for 6 hours, adjust the
control to 25% (6 hours is 25% of 24 hours).
The timer controls have a minimum setting of 14
minutes when set at 0%.
c.
Adjust the repeat cycle timer (4) control T1 to approximately 25% (6 hours) and control T2 to approximately 2%
(30 minutes). This is the recommended factory setting, however, the controls can be set as desired to best suit
the operating conditions.
d.
Close the control box cover (3). Install two bolts (1) with new lock washers (2) (1, appendix G).
e.
Close and secure the control panel cover.
Figure 4-5. Defrost Timer Adjustment
4-8
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