Vogt P-24AL, Service Manual

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P24AL & P34AL Service Manual
START-UP & OPERATION
12/2016
5-6
Start-Up.
Starting the machine in a freezing cycle 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. If the compressor motor starter is wired to the control relay (3CR) then 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 should start unloaded and
will load automatically after several seconds of operation.
4. Turn the HAND/AUTO switch to the AUTO position.
5. When the discharge pressure increases to about 170 psig, push the MANUAL HARVEST button
to initiate the harvest cycle. See “Harvest Period”.
6. Set the thaw gas pressure regulator (18R) and the suction regulator (if used). See “Thaw Gas
Regulator” and “Suction Regulator” for instructions.
7. 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 freeze timer
(1TR) times out the switch will close and initiate the harvest cycle. If a freezer pressure switch
(2PS) has been installed, the suction pressure will decrease 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.
! IMPORTANT !
Complete the remaining part of the “Warranty/Registration Start-Up Report”
and return it to Vogt Ice, LLC.
! IMPORTANT !
Check the refrigerant level at the receiver liquid gage glass to make sure it is near the operating level
mark.
Adding Refrigerant. Add refrigerant while the machine is running by the following procedure:
1.
With a cylinder of anhydrous ammonia laying on its side, cylinder valve outlet pointing up and
bottom end raised two inches higher than the valve end, connect an “approved for ammonia”
charging hose between the freezer charging valve (28) and the cylinder valve.
2. Purge all air from the charging hose and open the cylinder valve gradually to check for possible
leaks around the packing nut or hose fittings. Then open the cylinder valve fully.
3.
While the “ammonia feed light is not illuminated, open the charging valve (28) and ammonia
will flow from the cylinder to the freezer.