HEC-Series Service Manual
SERVICE OPERATIONS
10/21/01
9-4
Allen Bradley Switch.
The following procedure is recommended for initially setting an AB pressure
switch which has
not
been previously adjusted:
1. Turn the bottom screw (differential) approximately 1/2 turn to the left (counter clockwise). The
pointer arrow, which is at the top middle of the switch, will be at the “F” setting. See
FIGURE 9-1.
2. Turn the top screw (range adjustment) approximately 4 1/2 turns to the left (counter
clockwise). The pointer on the range setting will be between 40 psi and 50 psi. See
FIGURE 9-1.
3. After the machine is running, the range adjustment (top screw) will have to be fine tuned to get
the proper ice thickness. (Clockwise = Thinner Ice) (Counter Clockwise = Thicker Ice)
The freezing time can be such that a small percentage of the ice is frozen solid. If so, some ice from
the top and bottom of the freezer should have a small hole in the center to insure that the freezing
time has not been extended to where a loss in capacity would result.
It is preferable that the freezing cycle be such that a small diameter hole remain in the center of the ice
cylinder. (1/16” diameter for 7/8” diameter ice, and 1/8” diameter for 1 1/8” diameter ice.) This
insures that the freezing cycle is not extended unnecessarily and eliminates a possible opaque core in
the center of the ice.
When crushed ice is produced, the freezer pressure switch (FPS1) (FIGURES 6-1 & 9-1) should be
set to produce ice having a wall thickness of approximately 3/16”.
Note: While making crushed ice, if machine harvests after running a five minute freeze cycle, the
crushed ice pressure switch (FPS1) is set too high. Lower pressure setting by turning the range
adjustment (top screw) counter clockwise.
High-Low Pressure Switch.
The high-low pressure switch (4PS) (FIGURES 1-2A, 1-3A, & 9-2) is
a two pole dual function switch. Located in the machine outside the control panel, it protects the
machine from possible damage due to abnormal pressure during operation.
! CAUTION !
When this switch causes the machine to stop, the cause should be
identified and corrected before resuming normal operation.
See Fault Identity, Section 6, Table 6-2.
! CAUTION !
The
LOW
pressure cut-in should be set at 40 psig and the cut-out set at 20 psig. After tripping at the
cut-out setting, the switch will reset automatically when the pressure rises to the cut-in setting.
The
HIGH
pressure cut-out should be set at 300 psig. After tripping, reset the switch manually.
Summary of Contents for HEC-10
Page 1: ...HEC SERVICE MANUAL ...
Page 95: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 13 FIGURE 9 9 Cutter Water Tank Parts ...
Page 96: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 14 FIGURE 9 10 Cutter Drive Parts ...
Page 97: ...HEC Series Service Manual SERVICE OPERATIONS 10 21 01 9 15 FIGURE 9 11 Cutter Parts ...
Page 106: ...HEC Series Service Manual MODEL NUMBER STRUCTURE 10 21 01 10 1 10 Model Number Structure ...