F) Led Lights And Audible Alarm Safeties - Hoshizaki KM-1301SAH/3 Service Manual

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
1-Minute Fill Cycle
Harvest Cycle
Harvest Pump Timer 1, 3, 2
Freeze Cycle
Pump-Out Cycle
The built-in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
1 High Evaporator Temp.
(temperature > 127°F)
2 Harvest Backup Timer
(harvest > 20 min. for two cycles
in a row)
3 Freeze Timer
(freeze > specified setting for
two cycles in a row)
Timer is factory set using S4 dip
switch 9 & 10
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6 Low Voltage
(92Vac±5% or less)
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
Energized
LED
Components
4 WV
1, 4, 2 Comp, FMR, WV,
HGV
Comp, FMR, PM,
HGV
1 Comp, FM/FMR,
PM, LLV
1, 4*, 3, 2 Comp, FMR, WV*,
PM, HGV
Type of Alarm
(53°C)
Time LEDs are On
Min.
2 minutes 20 minutes
0 seconds 50 seconds
5 minutes freeze timer
setting
10 seconds 20 seconds
Check for harvest problem (stuck HGV or relay), hot
water entering unit, stuck HM, or shorted thermistor.
Check for open thermistor, HGV not opening, TXV or
LLV leaking by, low charge, or inefficient Comp.
Check for F/S stuck closed (up), WV leaking by, HGV
leaking by, PM not pumping, TXV not feeding properly,
LLV not opening, low charge, HM not bypassing, or
inefficient Comp.
Red LED will turn off if voltage protection operates.
The control voltage safeties automatically reset when
voltage is corrected.
24
Max. Avg.
1 minute
3 to 5 minutes
harvest pump timer
setting
30 to 35 minutes
*pump-out timer
setting
Notes