TM 9-4110-258-13
4.8
PRELIMINARY SERVICING OF EOUIPMENT. - Continued
Figure 4-5. Compressor Mount
f. Close both side condenser doors.
4.9
PRELIMINARY ADJUSTMENT OF EOUIPMENT.
a. Open control box cover and secure open with door holder clips.
b. Remove six screws (1, fig. 4-6). Open the control box cover (2).
NOTE
The defrost 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 adjust the maximum length of time
the refrigeration unit will
remain in the defrost cycle.
The time scales indicate an approximate percentage of time based on 24
hours. For example, to set the time for 6 hours, adjust the control to 25%
(6 hours is 25% of 24 hours).
The time controls have a minimum setting of 14 minutes when set a 0%.
c. Adjust the defrost timer (3) 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 (2). Install six screws (1).
e. Close and secure the control box cover.
f. Adjust dual pressure control switch (4) HIGH PRESSure CUTOUT to 305, low pressure CUT IN to 0, and low
pressure CUTOUT to15 IN. VAC.
4-6
