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3.11 SO218/318 OPERATION INFORMATION
FOR SERVICE PERSONNEL
The SO218/318 is a cocktail/slush freezer. It is available in 208-230 volt, either air-cooled or water-cooled.
The air-cooled version has front-to-back airflow requiring three inches of air space in the front and back for
proper refrigeration. This unit is not supplied with a pump, however, Stoelting does offer the Fill-O-Matic II
(electric) and Fill-O-Matic III (gas) pumps FOR THE SO318. This freezer is intended for use with non-dairy
products only and will produce 15-18 GPH.
1. Filling
To fill the freezer, pour mix into hopper until full. To fill freezers with the optional Fill-O-Matic pump, connect
the pump and turn the fill switch on. This will open the solenoid valve and the freezer will begin to fill. The
liquid level control circuit is designed with a fill timer. This timer is designed to shut the compressor off if
the top level probe is not satisfied before the timer expires. If the top level probe is not satisfied before the
timer times out, it locks the compressor out and freezing will not occur, if this happens, turn the fill switch
off and then back on, this will reset the timer.
2. Operation
Once the freezer is full of mix, turn the clean-off-serve switch to the “serve” position. The drive motor will
start immediately. The compressor utilizes a 10 second delay-on-make / delay-on-break timer therefore, the
compressor will start 10 seconds later. The compressor will continue to run until the drive motor torque
switch is satisfied, then after a 10 second delay stop. The drive motor runs continuously in the “serve” or
“clean” switch positions. There is no night mode or standby mode. If product is left in the freezer overnight
we recommend to simply turn the freezer off. Do not run the freezer in “clean” overnight. Freeze down time
will typically be 6-10 minutes depending on the type of product used and the starting product temperature.
3. Pump Operation
When the mix level in the hopper drops below the bottom level probe, the solenoid valve opens and the
pump begins to fill until the top level probe is satisfied. When satisfied, the solenoid valve closes, and
pump will continue to run until shut off pressure is reached. The electric pump will run until the pressure
reaches the cut-out pressure of the pump. A gas pump will continue to run until the pressure in the mix line
equals the gas pressure of the pump. If you wish to use the product in the hopper prior to cleaning, turn the
pump off and turn the freezer fill switch off. This will disable the fill timer and allow the compressor to
continue to run. Be cautioned that once the hopper is empty, the barrel could freeze up. Only run the
freezer until the hopper is empty or damage may occur.
4. Fill Timer Operation
The timer has ten dip switches, all switches placed in the “on” position are added together to make up the
total time delay. This freezer leaves the factory with 64, 128 and 256 in the “on” position, this is a total of
448 seconds. The preset time should be enough to fill the hopper up to the top level probe. Fill time may be
dependent on what style pump is employed. The purpose of the timer is to disable the compressor if the
mix supply runs out. When the timer expires, the mix low light will illuminate. If the mix low light is
illuminated, the compressor is locked out of the electrical circuit and will not run. It may be necessary to
change the timer settings to more closely match the pumping capacity of your pump.