Hoshizaki KM-1301SAH/3, KM-1301SRH/3 LED Lights and Audible Alarm Safeties, Sequence Step

f) LED Lights and Audible Alarm Safeties

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position.

The red LED indicates proper control voltage and will remain 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
Harvest Pump Timer		1, 3, 2		Comp, FMR, PM,		0 seconds		50 seconds		harvest pump timer
				HGV						setting
Freeze Cycle		1		Comp, FM/FMR,		5 minutes		freeze timer		30 to 35 minutes
				PM, LLV				setting
Pump-Out Cycle		1, 4*, 3, 2		Comp, FMR, WV*,		10 seconds		20 seconds		*pump-out timer
				PM, HGV						setting

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	Check for open thermistor, HGV not opening, TXV or
	(harvest > 20 min. for two cycles	LLV leaking by, low charge, or inefficient Comp.
	in a row)
3	Freeze Timer	Check for F/S stuck closed (up), WV leaking by, HGV
	(freeze > specified setting for	leaking by, PM not pumping, TXV not feeding properly,
	two cycles in a row)	LLV not opening, low charge, HM not bypassing, or
	Timer is factory set using S4 dip	inefficient Comp.
	switch 9 & 10
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6	Low Voltage	Red LED will turn off if voltage protection operates.
	(92Vac±5% or less)	The control voltage safeties automatically reset when
		voltage is corrected.
7	High Voltage
	(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; WV–inlet water valve

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