Vogt TUBE-ICE P-118F, Service Manual

Page: 74 / 115

P118F Service Manual
SERVICE OPERATIONS
1/6/09
9-4
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, 1/8” diameter for 1 1/8” diameter ice. 1/4”
diameter for 1 3/8” 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 (FPS) (FIGURE 9-1) should be set to
produce ice having a wall thickness of approximately 3/16”.
High-Low Pressure Switch. The high-low pressure switch (HPS) (FIGURE 9-2) is a two pole dual
function switch. Located in the machine mounted to the frame near the compressor. 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.
! 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.
FIGURE 9-2
High-Low Pressure Switch