Hoshizaki Modular Cubelet Serenity Series Service Manual page 24

c. Float Switch (LFS and UFS) – CB K8 #5 (BK) (common), CB K8 #6 (R) (upper),
and CB K8 #7 (DBU) (lower): 5VDC is present from CB white K5 connector pin
closest to CB red K4 connector to CB K8 #5 (BK) (common) at all times. If not,
replace CB. 5VDC is present from CB white K5 connector pin closest to CB red
K4 connector to CB K8 #6 (R) (upper) and CB K8 #7 (DBU) (lower) when FS is
open. If 5VDC is present between CB K8 #5 (BK) and CB K8 #6 (R) (upper) or CB
K8 #7 (DBU) (lower), FS is open. For further FS diagnostics, see "II.F. Float Switch
Check and Cleaning."
d. Bin Control 2 (mechanical backup) – CB K8 #3 (GY) and CB K8 #4 (GY): 5VDC
is present from CB white K5 connector, pin closest to CB red K4 connector to CB K8
#3 (GY) at all times. If 5VDC is not present, replace CB. When BC2 is closed (calling
for ice), 5VDC is present from CB white K5 connector, pin closest to CB red K4
connector, to CB K8 #3 (GY) and CB K8 #4 (GY). If 5VDC is not present to either CB
K8 #3 (GY) or CB K8 #4 (GY), replace CB. If 5VDC is present at CB K8 #3 (GY) and
not to CB K8 #4 (GY), BC2 is open. See "II.D.2. Bin Control 2 (mechanical backup)
Check."
5) Fill "WTRIN" LED is on: 24VAC is present at CB K2 #9 (W/R) at all times. If not,
confirm 24VAC from CB K2 #9 (W/R) to a neutral (LBU). When LFS open at startup
or opens during normal operation, "WTRIN" LED turns on, fill timer (FT) starts, freeze
timer (FZT) terminates (only during normal operation), and WV energizes. If LFS is
open and "WTRIN" LED is off, confirm LFS status. See "II.F. Float Switch Check and
Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN" LED is on
and WV is not energized, check for 24VAC at CB K2 #8 (O) to a neutral (LBU). If 24VAC
is not present on CB K2 #8 (O), replace CB. "WTRIN" LED turns off once UFS closes.
If not, confirm UFS status. See "II.F. Float Switch Check and Cleaning." If UFS is closed
and "WTRIN" LED is on, replace CB. If "WTRIN" LED is off and WV is open, check for
24VAC at CB K2 #8 (O). If 24VAC is present at CB K2 #8 (O), replace CB. If 24VAC is
not present, check WV diaphragm.
6) Ice Purge Cycle "GM" LED is on: When UFS closes, GM delay timer starts (5 or
30 sec. depending on CB S1 dip switch #7). Once GM delay timer terminates, "GM"
LED turns on, GM and EH energize and 5-min. ice purge timer starts. If GM does
not energize 30 sec. after UFS closes, confirm UFS status. See "II.F. Float Switch
Check and Cleaning." If UFS is closed and "GM" LED does not turn, replace CB.
If "GM" LED is on and GM and EH are off, check for 115VAC from CB K1 #3 (BK) to a
neutral (W). If not, check 115VAC power supply connections from power switch.
If 115VAC is present, check for 115VAC from CB K1 #2 (W/BK) to a neutral (W).
If 115VAC is present on CB K1 #3 (BK) and not on CB K1 #2 (W/BK), replace CB.
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