VOGT ICE TUBE-ICE P-24A Service Manual page 55

P24A & P34A Service Manual
Start-Up. Starting the machine can be accomplished as follows:
1. Make sure the crankcase oil temperature is approximately 100°F and there is no liquid ammonia
in the compressor crankcase.
2. Turn the Hand/Auto switch (1SS) to the "Hand" position and allow the water tank to refill.
MAKE SURE THE DRAIN VALVE IS CLOSED.
3. Push the green "Start" push button to start the compressor and immediately observe the oil
pressure, the oil level, the discharge pressure, and listen for any unusual sounds. The compressor
starts unloaded and will load automatically after several seconds by action of the delay timer
(DT).
4. Turn the Hand/Auto switch to the "Auto" position.
5. When the discharge pressure increases to about 170 psi, push the "Manual Harvest" button to
initiate the harvest cycle. See "Harvest Period".
6. When the suction pressure raises to 50-55 psig, any ice made should release and discharge. After
all of the ice clears the cutter and auger, turn the Hand/Auto switch to "Hand" and back to
"Auto". This will interrupt the harvest cycle and start another freeze cycle. See "Freeze Cycle".
As the machine continues its freezing cycle, the liquid ammonia will feed into the freezer until the
level float switch (10) is satisfied. The float switch will open and close the liquid line solenoid valve
(20) to maintain that level of ammonia in the freezer during the freeze cycle. When the suction
pressure pulls down to the setting of the freezer pressure switch (2PS), the switch will close and
initiate the harvest cycle. See "Harvest Period".
Be sure to observe several complete cycles of ice production to confirm the satisfactory operation of
the machine.
12/10/12
FIGURE 5-1.
Control Panel
START-UP & OPERATION
5-5