Vogt P18AL TUBE-ICE, Service Manual

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P18AL Service Manual
STAR-UP AND OPERATION
3/6/07
5-6
Thaw Gas Regulating and Suction Regulating Valve Adjustment. The following is the
procedure for regulating valve adjustment. On dedicated compressor systems the suction regulating
valve is not required. However the compressor must unload by 50% or greater during the harvest or
a hot gas bypass must be installed.
1. Install gauge and gauge valve in gauge port of regulator.
2.
Turn high pressure stem (down stream pressure) on suction regulator into the milled flats, do
not turn milled flats into packing nut.
3.
Start the machine and initiate a harvest.
4.
Adjust thaw gas regulator to build pressure to 60 - 65 psig ( 1 turn is approximately 13 psig).
5.
Adjust (downstream) high pressure stem on suction regulator to begin regulating at 59-64 psig.
(slightly below the thaw gas regulator)
6.
After the machine has completed the harvest cycle and returned to the freeze cycle, adjust the
low pressure (upstream pressure) on the suction regulator to maintain the required freezer
pressure. For clear ice a minimum of 20 psig freezer pressure is required.
Shut-down
! CAUTION !
The red “Stop” button should only be used for emergency shutdown.
For normal shutdown use the “Clean/Off/Ice” button.
! CAUTION !
1. Set the “Clean/Off/Ice” switch to the “Off” position. Do not use the machine disconnect to
stop the machine. If the disconnect is used the crankcase heater will be de-energized and
liquid refrigerant will migrate to the compressor.
2.
If in a freeze mode, the machine will continue to run.
3.
At the completion of the freeze cycle the machine will harvest and stop. The completion of a
cycle ensures that all ice is removed from the freezer to prevent refreeze when the machine is
restarted.
4.
If in a harvest, the machine will complete the harvest and stop.