Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C - Page 29

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9) Rell Cycle/Low Water Safety Cycle – "GM", "COMP", and "WTRIN" LEDs are on.
As ice is produced, the water level in the reservoir drops. UF/S opens. Nothing happens
at this time. When LF/S opens, WV energizes, 90-second low water safety timer (ll
timer) starts. GMR (X2 on CB), GM, GMPR, EH, PDS, MC, Comp, and FMR continue.
When LF/S closes, nothing happens at this time. When UF/S closes, WV de-energizes,
90-second low water safety timer (ll timer) terminates, and 30-minute freeze timer
starts.
If UF/S remains open 90 seconds after WV energizes (LF/S opens) (ll timer
exceeded), a 90-second shutdown cycle starts. CB X1 relay de-energizes, de-
energizing PDS. Refrigeration circuit low-side pressure drops to 9 PSIG, opening
CLPS. CLPS opens de-energizing MC, Comp, and FMR. CB signals a 1-beep alarm
every 5 seconds. 90-second purge timer starts. GMR (X2 on CB), GM, GMPR, and EH
continue. 90-second purge timer terminates, GMR (X2 on CB), GM, GMPR, and EH
de-energizes. WV and 1-beep alarm continue until UF/S closes.
Diagnosis–Checkthat"WTRIN"LEDison.Ifnot,checkthatLF/Sisopen.See"IV.E.
FloatSwitchCheckandCleaning."IfLF/Sisopenand"WTRIN"LEDisoff,CBisbad
andmustbereplaced.If"WTRIN"LEDison,checkthatthereservoirlls.Ifnot,check
for water supply line shut-off valve closed, clogged water lters, and clogged WV screen.
Next, check 24VAC to WV from CB K2 connector pin #8white/brown (W/BR) wire to a
light blue (LBU) neutral wire. Check for continuity through WV solenoid. If open, replace
WV. If WV is energized and rell exceeds 90-second low water safety timer (ll timer)
withnowaterinthereservoir,checkforDVleaking.Ifreservoirisfullandoverowing
check that UF/S closes. If not, check UF/S continuity, red (R) wire to black (BK) wire.
Cleanorreplaceifnecessary.See"IV.E.FloatSwitchCheckandCleaning."
Note: Each time UF/S closes, 30-minute freeze timer starts. The 30-minute freeze timer
resets when UF/S closes again. If UF/S does not close again within 30 minutes,
CB shuts down the unit and sounds a 5-beep alarm every 5 seconds. See
"II.C.2.LEDLightsandAudibleAlarmSafeties."
10) Shutdown–See"IV.D.BinControlCheck."
Legend: CB–control board; CLPS–control low-pressure switch; Comp–compressor;
DV–drain valve; EH–evaporator heater; FMR–fan motor-remote;
GM–gear motor; GMPR–gear motor protect relay; GMR–gear motor relay;
HM–headmaster; HPS–high-pressure switch; IS–infrared sensor; LF/S–lower
oatswitch; MC–magnetic contactor; MBC–mechanical backup bin control;
PDS–pump-down solenoid valve; SLPS–safety low-pressure switch;
UF/S–upperoatswitch;WV–inlet water valve