Sub-Zero UC-15I

3-10
#7012423 - Revision A - August, 2009
Theory of Operation
Model UC-15I (Undercounter Ice Machine)
Ice
The general shape of the ice cubes is octagonal and
tapered toward the top, with the base being approxi-
mately 1-1/4” wide, the top being approximately 1” wide
and the height being approximately 1-1/8” (See Figure
3-12). When the machine is adjusted properly, there
should be approximately 1/4” deep dimple in the base
of the cube. (See Cube Weight Adjustment later in this
section) The cubes will be wet when fresh, which is
normal. The cubes may also develop frost on the out-
side and look cloudy, this is also normal. (The frost will
disappear when liquid is poured over the cubes.)
Storage
The ice storage bin is not refrigerated, but it is insulat-
ed, similar to a picnic cooler. If the ice bin were refrig-
erated, the cubes would freeze together into one large
cluster of ice. This would yield ice that is of very poor
quality and would be very difficult to remove from the
machine.
Run Time
The model UC-15I will continue to operate until the ice
builds up high enough to contact the bin thermostat
sensor tube, then it will switch OFF(See Figure 3-13).
The ice machine remains OFF until ice no longer con-
tacts the bin thermostat bulb holder and the thermostat
bulb warms up. The increase in temperature will restart
the ice machine.
The amount of time that the model UC-15I will run to
replace melted ice (without the door being opened) is
approximately four (4) hours per day.
The amount of time that the ice machine will run to
replace ice removed during use will depend upon how
much ice is removed, how often ice is removed, how
clean the ice machine is and how hot the ambient air
and water supplied to the ice machine are. An empty
ice bin will usually take twelve (12) to twenty-four (24)
hours to refill.
NOTE: The models UC-15IP and UC-15IPO have a
drain pump that is powered off of L1, so even when the
ice machine is switched OFF, the pump can continue to
pump melted ice water to the drain.
Figure 3-12. Proper Cube Appearance
Figure 3-13. Ice Bin Storage Level
WHAT TO EXPECT FROM THE MODEL UC-15I
The model UC-15I will release a batch of cubes approximately every thirty minutes. At the same time the cubes fall
into the bin, water will be filling the reservoir and carrying the mineral impurities down the drain.
Bin Thermostat
Bulb Holder