VOGT ICE TUBE-ICE P-24A Service Manual page 53

P24A & P34A Service Manual
Charging From Tank Truck. The machine may be charged by bulk from a tank truck and be
pumped directly into the receiver through the drain valve (44).
Follow these instructions with caution:
1. Using a ammonia approved charging hose, connect one end to the charging valve (44) in the
bottom of the receiver.
2. Connect the other end of the charging hose to the tank truck. It is best to have a gage in this line
to indicate pressure.
3. Open the charging valve (44) and the fill valve from the tank truck.
4. Fill the receiver to the indicated mark on the sight glass (30).
Charging From Cylinders. The machine may also be charged from refrigerant cylinders. To charge
from cylinders, the compressor will have to operate to transfer the ammonia from the freezer to the
receiver. Again, make sure all the necessary valves are opened for operation and the compressor
crankcase heater has been energized for a minimum for four hours.
Follow these instructions with caution:
1. Using a approved for ammonia charging hose, connect one end to the charging valve (28) in the
liquid line near the freezer.
2. Lay a full cylinder of anhydrous ammonia horizontally with the cylinder valve outlet pointing up
to withdraw liquid and the bottom end raised about 2" higher than the top end.
3. Connect the other end of the charging hose to the cylinder valve. It is recommended that a gage
be attached to this line to indicate cylinder pressure.
4. Close the liquid line stop valve (29) or (58).
5. Open charging valve (28) and carefully purge air from the charging hose.
6. Open the cylinder valve slowly, checking for leaks in the line and allow the suction pressure to
build up to approximately 40 psig and check again for leaks in the system.
7. With the power off, open the control panel door and disconnect wire #24 from the freezer
pressure switch (2PS), then turn the power back on.
8. Check compressor rotation by starting and stopping the compressor momentarily using the green
"Start" push button (2PB) and the red "Stop" push button (1PB). Correct compressor rotation is
indicated by an arrow on the outer rim of the oil pump assembly (opposite the shaft end of the
compressor.
9. Set the Hand/Auto switch (1SS) to the "Hand" position allowing the circulating water pump to
circulate water through the freezer.
10. As the pressure continues to rise in the freezer, start the compressor and pump the ammonia into
the receiver. Make sure water is circulating through the condenser and freezer tubes.
12/10/12
Do NOT attempt to bulk charge the machine through the freezer
charging valve (28). The freezer will not hold the full charge
without exposing the compressor to serious damage.
! CAUTION !
! CAUTION !
START-UP & OPERATION
5-3