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Operational Components
Kold-Draft
Skins
The skins consist of the top, left end, back, right end panels and front inspection panel.
Condensing Units
Varies with each model. For compressor size and charge, refer to the Water Levels,
Pressures, Cycles and Charges Chart on the previous page.
Evaporator
The GB series Full Cube (C) evaporator is made up of 108 cells, 1-1/4" each way.The
Cubelet (K) evaporator is made up of 216 cells, 1-1/4" x 1-5/8" x 5/8" deep. The Half
Cube (HK) evaporator is made up of 216 cells, 5/8" x 1-1/4" x 1-1/4" deep. The material
is copper and the entire assembly is tinned, preventing corrosion and making its use
acceptable to any sanitary board. A seal is not required between the evaporator and
water plate, normally there is an approximately 1/32" clearance between them. Refer to
Water Plate-Evaporator Alignment for adjustments.
Note: GT300 evaporators contain 1/2 the number of cells of a GB evaporator.
Refrigerant Control
1. Thermostatic expansion valves are used on all GB and IS models and GT400,
GT500 and GT600 models. For replacement of the valve, consult the Parts
Price List for type of expansion valve. It has been regulated properly on test
before being shipped, to give minimum superheat and maximum flooding of the
evaporator and should not require adjustment.
Sometimes after shipping or storage, the expansion valve sticks and allows
more refrigerant to pass than necessary, increasing the low side pressure
and temperature, thus excessive frostback and a long cycle. If this condition
does not correct itself during the second cycle, it will be necessary to adjust the
superheat on the expansion valve, closing the valve clockwise 1/8 to 1/4 turn to
increase superheat, reducing the suction pressure and preventing frostback. If
valve hunts (varies suction pressure up and down) more than 2 to 3 lbs. when
suction pressure is below 13 lbs., it indicates that the valve should be opened
more.
2. The GT300 series are capillary systems and do not have an expansion valve.
Water Plate
The water plate is made of approved plastics and is used to distribute the water
through jet holes into the freezing cells of the evaporator, and also to return water
through two drain holes in each cell in the water plate. On the front of the water plate is
a control stream, that should be set at the base of the dam once the water fill is
complete. Backing the screw out increase the flow. At the end of a cycle when cubes
are virtually frozen there is an increasing water pressure in the system causing the
stream to rise and go over the dam dumping dreg water.
Circulation Tank
The circulation tank is secured to the bottom of the water plate. It serves as a reservoir
to hold enough water to make one batch of ice.
®
Electronic Cuber Construction
-6B-
®
Kold-Draft
Service & Parts Manual
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