Hoshizaki KM-320MAH - Manual (Page 11)

11
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
(every 3 sec.)
Type of Alarm Notes
1 High Evaporator Temp.
(temperature > 127°F)
(53°C) Check for defrost problem (stuck HGV
or relay), hot water entering unit, stuck
headmaster, or shorted thermistor.
2 Defrost Backup Timer
(defrost > 20 min.) Orange LED marked H TIMER lights up.
Check for open thermistor, HGV not
opening, TXV leaking by, low charge, or
inefficient compressor.
3 Freeze Backup Timer
(freeze > 60 min.) Yellow LED marked F TIMER lights up.
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
(control voltage
> 147Vac ±5%) Red LED will turn off if voltage protection
operates.
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.