Hoshizaki SRH3 KM-2500SWH3, SRH/3, SWH/3 B. LED Lights and Audible Alarm Safeties, E Control Board

B. LED Lights and Audible Alarm Safeties

1. "E" Control Board

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 "POWER OK" 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.

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, HGV, WV	2 minutes		20 minutes	3 to 5 minutes
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, HGV, PM,	10 seconds		20 seconds	*pump-out timer
		WV*				setting

The built in safeties shut down the icemaker 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) (53°C)	water entering icemaker, or shorted thermistor.
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, or inefficient Comp, or WRV
		leaking by.
3	Freeze Timer	Yellow "F TIMER" LED on.
	(freeze > specified setting for	Check for FS 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; FS–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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