Vogt P18AL TUBE-ICE, Service Manual

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P18AL Service Manual
SERVICE OPERATIONS
3/6/07
9-2
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 remains 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.
FIGURE 9-2
Multi-function Digital Freeze Timer
Conveyor Timer (T3). An added feature of your machine is a conveyor timer. This timer can be
used to control the duration of operation of a conveyor or screw.
Flush Valve Timer (T4).
A feature of this machine is the automatic blowdown, which is provided
to eliminate or reduce the necessity for frequent flushing or cleaning of the water tank. The primary
purpose of the automatic blowdown is to remove accumulated salts and/or solids from the water tank
that accumulate during the freezing cycle. This flushing action each cycle greatly reduces the total
dissolved solids in the tank and results in clear ice production.
At the beginning of a harvest cycle a solenoid operated valve is actuated which allows water to flow
into the tank during the harvest cycle. The valve is actuated by a timer that allows for adjustment of
the amount of water discharged during the harvest period (see figure 9-1 for settings). The machine
should be started and run initially with a 30 second blowdown period and gradually increased until
clear ice is produced.
Digital Timer Readout Legend
1. Power supply symbol
2. Closed control contact symbol
3. Flashing symbol during time delay
4. Current value readout (4 digits)
5. Unit of time
6. Separation of units of time
7. Operating Modes
8. Increasing (Up) or Decreasing (Down)
9. Time range
10. Changeover relay status symbol
(NC = Normally Closed, NO = Normally Open)
11. Next stage
12. Configuration Validation
13. Incrementation of T
14. Display of time pre-selection T (4 digits)