Hoshizaki KM-320MWH, KM-320MAH service manual Led

The green LEDs 1-4 represent the corresponding relays and energize and sequence

5 seconds from initial startup as follows:

Sequence Step	LED			Time LEDs are Lit
		Min.		Max.	Avg.
1 Minute Fill Cycle	4				60 seconds
Harvest Cycle	1, 4, and 2	2 minutes		20 minutes	3 to 5 minutes
Freeze Cycle	1	5 minutes		60 minutes	30 to 35 minutes
Reverse Pump Out	1, 3, and 2	10 seconds		20 seconds	factory setting
{Led 1 – Comp; Led 2 - HGV/CFM;			Led 3 – PM;		Led 4 - WV}

The built in safeties shut down the unit and have alarms as follows:

No. of Beeps	Type of Alarm	Notes
(every 3 sec.)
1	High Evaporator Temp.	Check for defrost problem (stuck HGV
	(temperature > 127°F)	or relay), hot water entering unit, stuck
	(53°C)	headmaster, or shorted thermistor.
2	Defrost Backup Timer	Orange LED marked H TIMER lights up.
	(defrost > 20 min.)	Check for open thermistor, HGV not
		opening, TXV leaking by, low charge, or
		inefficient compressor.
3	Freeze Backup Timer	Yellow LED marked F TIMER lights up.
	(freeze > 60 min.)	Check for F/S stuck closed (up), WV
		leaking by, HGV leaking by, TXV not
		feeding properly, low charge, or inefficient
		compressor.

To manually reset the above safeties, press the white alarm reset button with the power supply on.

6	Low Voltage
	(92Vac or less)
7	High Voltage	Red LED will turn off if voltage protection
	(control voltage	operates.
	> 147Vac ±5%)	The voltage safety automatically resets
		when voltage is corrected.

The output test switch "S3" provides a relay sequence test. With power OFF, place S3 ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4, normal sequence every 5 seconds. S3 should remain in the "OFF" position for normal operation.

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