Technical information

12/01/02

HOSHIZAKI KM CUBER

SEQUENCE OF OPERATION

THE STEPS IN THE SEQUENCE ARE AS FOLLOWS:

NOTE: When power is supplied to the “E” Control board,

a 5 second delay occurs at start-up.

1. 1 Minute Fill Cycle

The unit always starts in the 1 minute fill cycle. When

power is applied to the unit the water valve is ener-

gized and the fill period begins. After 1 minute the

board checks for a closed float switch. If the float

switch is closed the harvest cycle begins. If not, the

unit will not start without adequate water in the sump.

This serves as a low water safety shut off. The water

valve will remain energized through additional 1 min-

ute cycles until water enters the sump and the float

switch closes.

2. 1st Harvest Cycle

The compressor starts, hot gas valve opens, water

valve remains open and harvest begins. As the evap-

orator warms, the thermistor located on the suction

line checks for a 48° F. temperature. When 48° F. is

reached, the harvest is turned over to the adjustable

control board defrost timer which is factory set for

normal conditions. This adjustment can vary the de-

frost timer from 1 to 3 minutes.

3. Freeze Cycle

After the timer terminates the harvest cycle, the hot

gas and water valves close, and the ice production

cycle starts. For the first 5 minutes the controller

board will not accept a signal from the float switch.

This 5 minute minimum freeze acts as a short cycle

protection. At the end of 5 minutes the float switch

assumes control. As ice builds on the evaporator the

water level in the sump lowers. Thefreeze continues

until the float switch opens and terminates ice

production.

12/20/03

2/20/03