Hoshizaki KM-320MAH Service Manual page 11

The green LEDs 1-4 represent the corresponding relays and energize and sequence
5 seconds from initial startup as follows:
Sequence Step
1 Minute Fill Cycle 4
Harvest Cycle
Freeze Cycle
Reverse Pump Out 1, 3, and 2
{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.)
1
2
3
To manually reset the above safeties, press the white alarm reset button with the
power supply on.
6
7
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.
LED
1, 4, and 2
1
Type of Alarm
High Evaporator Temp.
(temperature > 127°F)
(53°C)
Defrost Backup Timer
(defrost > 20 min.)
Freeze Backup Timer
(freeze > 60 min.)
Low Voltage
(92Vac or less)
High Voltage
(control voltage
> 147Vac ±5%)
Time LEDs are Lit
Min. Max.
2 minutes 20 minutes 3 to 5 minutes
5 minutes 60 minutes 30 to 35 minutes
10 seconds 20 seconds factory setting
Check for defrost problem (stuck HGV
or relay), hot water entering unit, stuck
headmaster, or shorted thermistor.
Orange LED marked H TIMER lights up.
Check for open thermistor, HGV not
opening, TXV leaking by, low charge, or
inefficient compressor.
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.
Red LED will turn off if voltage protection
operates.
The voltage safety automatically resets
when voltage is corrected.
11
Avg.
60 seconds
Notes