Led Lights And Audible Alarm Safeties - Hoshizaki KMS-1122MLH Service Manual

B. LED Lights and Audible Alarm Safeties
At startup, a 5-sec. delay occurs while CB conducts an internal timer check. A beep
occurs when the control switch (KMS) is moved to the "ICE" position. The red "POWER
OK" LED indicates proper control voltage and remains 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.C. Control Board Check."
Sequence Step
1-Minute Fill Cycle
Harvest Cycle
Harvest Pump Timer
Freeze Cycle
Pump-Out Cycle
Built in safeties shut down the appliance and have alarms as listed below.
To reset, press CB "ALARM RESET" button with the power supply on.
WARNING! Risk of electric shock. Care should be taken not to touch live terminals.
No. of Beeps
(every 3 sec.)
1 High Evaporator Temp.
(temperature > 127°F (53°C))
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
6 Low Voltage
(92VAC±5% or less)
7 High Voltage
(147VAC±5% or more)
Legend: CB–control board; Comp–compressor; DV–drain valve; FMRs–fan motors-remote;
FS–float switch; HGVs–hot gas valves; HM–headmaster;
LLVs–liquid line valves; PM–pump motor; TXVs–thermostatic expansion valves;
WV–inlet water valve
LED Lights and Components
LED
4
1, 4, 2
1, 3, 2
1
1, 3, 2
Manual Reset Alarm Safeties
Type of Alarm
Automatic Reset Alarm Safeties
Automatically reset when voltage returns to acceptable range.
Energized
Components
Min.
WV
Comp, FMRs 2 min.
WV, HGVs
Comp, FMRs, 0 sec.
PM, HGVs
Comp, FMRs, 5 min.
PM, LLVs
Comp, FMRs, 10 sec. 20 sec.
PM, HGVs, DV
Check for harvest problem (stuck HGVs or relay), hot
water entering icemaker, stuck HM, or shorted thermistor.
Check for open thermistor, HGVs not opening, TXVs or
LLVs leaking by, low charge, or inefficient Comp.
Check for FS stuck closed (up), WV leaking by, HGVs
leaking by, PM not pumping, TXVs not feeding properly,
LLVs not opening, low charge, HM not bypassing, or
inefficient compressor.
Red "POWER OK" LED will turn off if voltage protection
operates.
27
Time LEDs are On
Max. Avg.
1 min.
20 min. 3 to 5 min.
50 sec. harvest pump
timer setting
freeze timer 30 to 35 min.
setting
Notes