Led Lights And Audible Alarm Safeties - Hoshizaki KM-1301SAJ-E Service Manual

B. LED Lights and Audible Alarm Safeties
Beep occurs and red "POWER OK" LED turns on when control switch is moved to "ICE"
position.
Green LEDs 1 through 4 turn on and sequence from initial startup as listed in the table
below. Order of green LEDs from the outer edge of control board is 1, 4, 3, 2.
Sequence Step
1-Minute Fill Cycle
Harvest Cycle
Harvest Pump Time
(harvest assist)
Freeze Cycle
Slush Control
Pump-Out Cycle
† pump-out timer setting
Type
1 High Evaporator Temp.
Beep (temperature > 127°F) (53°C)
2 Harvest Backup Timer
Beep (harvest > 20 min. for two
cycles in a row)
3 Freeze Timer
Beep (freeze > freeze timer setting
for two cycles in a row)
To reset above safeties, press "ALARM RESET" button with power supply on.
6 Low Voltage
(92Vac±5% or less)
7 High Voltage
(147Vac±5% or more)
Legend: CB–control board; Comp–compressor; FM–fan motor; FS–float switch;
HGV–hot gas valve; LLV–liquid line valve; PM–pump motor; TXV–thermostatic
expansion valve; WV–inlet water valve
LED
4 WV
1, 4, 2 Comp, HGV, WV
1, 3, 2 Comp, HGV, PM
1 Comp, FM, PM, LLV
1, 3 Comp, FM, LLV
1, 4 , 3, 2 Comp, HGV, PM, WV
†
Alarm
Sequence
Energized
Components
†
Alarms
Check for harvest problem (stuck HGV or relay), hot
water entering unit, stuck HM, or shorted thermistor.
Check thermistor (open), HGV not opening, TXV or LLV
leaking by, low charge, inefficient Comp.
Check FS stuck closed (up), WV leaking by, HGV leaking
by, PM not pumping, TXV defective, LLV not opening, low
charge, or inefficient Comp.
Red LED turns off if voltage protection operates.
Control voltage safeties automatically reset when voltage
is corrected.
31
Time LEDs are On
Min. Max.
1 minute 20 minutes
0 seconds 50 seconds
5 minutes freeze timer
setting
If S5 dip switch 5 on,
PM off 10 sec. when
thermistor at 36°F (2.2°C)
10 seconds 20 seconds
Notes