Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 LED Lights and Audible Alarm Safeties, Sequence Step

f) LED Lights and Audible Alarm Safeties

(1) "E" Control Board: Auxiliary Code T-0, U-0

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when power is turned off. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs

1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2.

For details, see "II.B. Sequence of Operation."

Sequence Step	LED	Energized		Time LEDs are On
		Components	Min.	Max.	Avg.
1-Minute Fill Cycle	4	WV			1 minute
Harvest Cycle	1, 4, 2	Comp, FMR, WV,	2 minutes	20 minutes	3 to 5 minutes
		HGV
Freeze Cycle	1	Comp, FM/FMR, PM,	5 minutes	freeze timer 30 to 35 minutes
		LLV		setting
Pump-Out Cycle	1, 4*, 3, 2	Comp, FMR, WV*,	10 seconds	20 seconds	*pump-out timer setting
		PM, HGV

The built-in safeties shut down the unit and have alarms as listed below.

No. of Beeps	Type of Alarm	Notes
(every 3 sec.)
1	High Evaporator Temp.	Check for harvest problem (stuck HGV or relay), hot
	(temperature > 127°F)	water entering unit, stuck HM, or shorted thermistor.
	(53°C)
2	Harvest Backup Timer	Orange "H TIMER" LED on.
	(harvest > 20 min. for two cycles	Check for open thermistor, HGV not opening, TXV or
	in a row)	LLV leaking by, low charge, inefficient Comp, or WRV
		leaking by.
3	Freeze Timer	Yellow "F TIMER" LED on.
	(freeze > freeze timer setting for	Check for F/S stuck closed (up), WV leaking by, HGV
	two cycles in a row)	leaking by, PM not pumping, TXV not feeding properly,
		LLV not opening, low charge, HM not bypassing, or
		inefficient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6	Low Voltage	Red LED turns off if voltage protection operates.
	(92Vac±5% or less)	The control voltage safeties automatically reset when
7	High Voltage	voltage is corrected.
	(147Vac±5% or more)

Legend: Comp–compressor; FM–fan motor; FMR–fan motor-remote;

F/S–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve

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