F) Led Lights And Audible Alarm Safeties - Hoshizaki KMS-1230MLH Service Manual

f) LED Lights and Audible Alarm Safeties

The red LED indicates control voltage (10 to 1V at K) and will remain on unless a
control voltage problem occurs. At startup a 5 second delay occurs while the board
conducts an internal timer check. A beep occurs when the control switch is moved to the
"ICE" position.
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 board is 1, 4, 3, .
For more information, see "II.B. Sequence of Operation."
Sequence Step
1 Minute Fill Cycle 4
Harvest Cycle
Last 50 seconds of harvest, HWV de-energizes and PM energizes
(LEDs 1, 3 and  are on)
Freeze Cycle
Pump-Out
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 > 17°F)
 Harvest Backup Timer
(harvest > 0 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
(9Vac ±5% or less)
7 High Voltage
(147Vac ±5% or more)
Legend: Comp–compressor; DWV–drain water valve; FMR–remote fan motor; FWV–fill
water valve; HGV–hot gas valve; HM–headmaster; HWV–harvest water valve;
LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve
Energized
LED
Components
FWV
1, 4 and  HWV, HGV,
Comp,FMR
1 (and 4 at Comp, PM,
refills) FMR, LLV
(FWV at
refill)
1, 3 and  Comp, HGV,
PM, DWV,
FMR
Type of Alarm
(53°C)
Time LEDs are On
Min.
 minutes 0 minutes 3 to 5 minutes
5 minutes freeze timer
setting
10 seconds 0 seconds factory setting
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 leaking by, low charge or inefficient Comp.
Check for a float switch stuck closed (up), HWV
or FWV leaking by, HGV leaking by, TXV not
feeding properly, low charge, HM not bypassing
or inefficient compressor.
Red LED will turn off if voltage protection oper-
ates.
The control voltage safeties automatically reset
when voltage is corrected.
17
Max. Avg.
60 seconds
30 to 35 minutes
Notes