Hoshizaki KMD-700MRH, KMD-900MAH, KMD-700MAH, KMD-700MWH, KMD-900MWH, KMD-900MRH 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 or relay),
	(temperature > 127°F)	hot water entering unit, stuck headmaster, or
		shorted thermistor.
2	Defrost Backup Timer	Orange LED marked 20 MIN 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 60 MIN 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.
4	Short Circuit	Check connections and replace wire harness if
	(between the K4 connection	necessary.
	on the control board and the
	bin control relay)
5	Open Circuit	Check connections and replace wire harness if
	(between the K4 connection	necessary.
	on the control board and the
	bin control relay)

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. (The LEDs are not in numerical order on the board. See the diagram on the next page for the location and numbering of LEDs). S3 should remain in the “OFF” position for normal operation.

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