Harvest Cycle - Sub-Zero 315I Technical Service And Parts Manual

Model 315I (UC Ice Maker)

Harvest Cycle

During the harvest cycle the compressor is still operating, but the condenser fan and circulating spray pump are
switched off. The hot gas valve opens, interrupting the flow of warm refrigerant from the compressor to the con-
denser, diverting it to the evaporator. The water valve also opens, pouring water over the top of the evaporator and
into the reservoir. The warm gas in the evaporator, along with the water pouring over the top of the evaporator,
causes the ice cubes to release from the cube molds and fall into the bin. The ice machine timer continues turning,
and when it turns far enough, it stops the harvest cycle and the freeze cycle begins again.
NOTE: The Water System During Harvest Cycles - During the harvest cycle, approximately three quarts of water
are added to the reservoir, over-filling the reservoir by approximately one quart. The extra quart of water rinses the
reservoir and goes down the drain carrying the mineral impurities.
Compressor
(ON)
Circulating
Water Inlet
Spray Pump
(OFF)
Figure 3-5. Harvest Cycle
3-5
Theory of Operation
Cubes Release
Evaporator
From Molds
(Warm Gas
Circulating)
Hot Gas Valve
(OPEN)
Drain
Inlet Water
Valve
(OPEN)
#3757320 - Revision B - August, 2005
Weep Hole
Reservoir
Condenser Fan
(OFF)