Hoshizaki KM-2500SWH3 - Manual (Page 18)

18
3. 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 power is turned off. The red LED indicates proper control
voltage and remains on unless a control voltage problem occurs. The green LEDs 1
through 4 energize and sequence from 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 more
information, see "II.B. Sequence of Operation."
Sequence Step LED Energized
Time LEDs are On
Min. Max. Avg.
1-Minute Fill Cycle 4 WV 1 minute
Harvest Cycle 1, 4, 2 Comp, FMR,
WV, HGV 2 minutes 20 minutes 3 to 5 minutes
Freeze Cycle 1 Comp, FMR,
PM, LLV 5 minutes freeze timer
setting
30 to 35 minutes
Pump-Out Cycle 1, 4*, 3, 2 Comp, FMR,
WV*, PM,
HGV 10 seconds 20 seconds *pump-out timer
setting
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
Type of Alarm Notes
1 High Evaporator Temp.
(temperature > 127°F)
(53°C) Check for harvest problem (stuck HGV or
relay), hot water entering unit, stuck HM, or
shorted thermistor.
2 Harvest Backup Timer
(harvest > 20 min. for
two cycles in a row) Orange "H TIMER" LED on.
Check for open thermistor, HGV not opening,
TXV or LLV leaking by, WRV leaking by, low
charge, or inefficient Comp.
3 Freeze Timer
(freeze > freeze timer
setting for two cycles in a
row)
Timer is factory set using
S4 dip switch 9 & 10 Yellow "F TIMER" LED on.
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.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6 Low Voltage
(92VAC±5% or less) Red LED turns off if voltage protection
operates.
The control voltage safeties automatically reset
when voltage is corrected.
7 High Voltage
(147VAC±5% or more)
Legend: Comp–compressor; 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; WRV–water regulating valve; WV–inlet
water valve