KM-650MAH-E Service manual - Hoshizaki
KM-650MAH-E Service manual - Hoshizaki
KM-650MAH-E Service manual - Hoshizaki
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B. Sequence of Operation<br />
1. Sequence Cycles and Shutdown<br />
a) "E" Control Board<br />
<strong>KM</strong>-320MAH-E and <strong>KM</strong>-<strong>650MAH</strong>-E Auxiliary Code U-0 and Earlier<br />
<strong>KM</strong>-515MAH-E Auxiliary Code U-1 and Earlier<br />
The steps in the sequence are as outlined below. When power is supplied, CB red<br />
"POWER OK" LED comes on. There is a 5‐second delay before startup. Note that the<br />
order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.<br />
(1) 1-Minute Fill Cycle<br />
LED 4 is on. WV energizes and the fill period begins. After 1 minute, CB checks for<br />
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized<br />
through additional 1-minute fill cycles until water enters the water tank and F/S closes.<br />
This serves as a low water safety to protect PM.<br />
(2) Initial Harvest Cycle<br />
LEDs 1, 4, and 2 are on. WV remains energized, Comp and HGV energize. CB<br />
monitors the warming of the evaporator via the thermistor located on the suction line.<br />
When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and<br />
turns harvest termination over to the adjustable harvest timer (S4 dip switch 1 & 2).<br />
The harvest timer has settings of 60, 90, 120, and 180 seconds. The pump‐out timer<br />
(S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out<br />
(S4 dip switch 5 & 6). WV is energized during harvest for a maximum of 6 minutes or<br />
the length of harvest, whichever is shorter. LED 4 turns off when WV de‐energizes.<br />
The minimum total time allowed by CB for a complete harvest cycle is 2 minutes. At<br />
the end of harvest, CB checks position of F/S and proceeds to the freeze cycle if it is<br />
closed or calls for a 1-minute fill if it is open.<br />
(3) Freeze Cycle<br />
LED 1 is on. Comp remains energized, PM, FM, and LLV (<strong>KM</strong>‐515MAH-E) energize.<br />
HGV and WV de-energize. For the first 5 minutes, CB will not terminate the freeze<br />
cycle. This minimum 5-minute freeze time is short cycle protection for Comp. As ice<br />
builds on the evaporator, the water level in the water tank lowers. Freeze continues<br />
until F/S opens, provided the 5-minute minimum freeze timer has terminated.<br />
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