Hoshizaki F-330BAH Service Manual page 16

5) Ice Purge Cycle–UFS closes, X11 relay energizes, WV de-energizes, and low-water
safety circuit (CB #3 and #4) closes. GM and X12 relay energize, 60 sec. Comp delay
timer starts. X11 Relay Diagnosis: Check for 35VDC at X11 relay #4 (DBU) to #6 (BR).
If 35VDC is present, X11 relay is de-energized or bad. Replace as necessary. If 0VDC
is present, GM energizes. GM Diagnosis: If GM does not energize and 0VDC is read
at CB #3 (BR) to CB #4 (DBU), check for 115VAC at CB #7 (BR) to neutral (W) and CB
#8 (W/BR) to neutral (W). If 115VAC is present on CB #7 (BR) and not on CB
#8 (W/BR), replace CB. If 115VAC is present on CB #8 (W/BR), check GM external
protector and GM winding. If GM starts but the auger does not turn, check coupling
between auger and GM.
X12 Relay Diagnosis: X12 relay energizes and starts 60 sec. Comp delay timer in
CB (CB #10 (W/BK) and #11 (W/O)). After 60 sec. timer terminates, confirm Comp
energizes. If not, check for 115VAC at X12 relay #7 (R) to X12 relay #8 (W). If 115VAC is
not present, check GM external protector and GM winding (internal protector). If 115VAC
is present, check for 35VDC at X12 relay #4 (W/BK) to X12 relay #6 (W/O). If 35VDC
is present, replace X12 relay. If 0VDC is present and Comp does not energize, replace
CB. See "II.C. Control Board Check."
On -C models, EH energizes when X12 relay energizes. If not, check for 24VAC at
X12 relay #5 (W/R) to neutral (LBU). Next, check for 24VAC at X12 relay #3 (P) to
neutral (LBU). If 24VAC is present on X12 relay #5 (W/R) and not on X12 relay #3 (P),
replace X12 relay.
6) Freeze Cycle–GM, X12 relay, and EH (-C model) continue. Comp and FM energize.
X11 relay energizes and de-energizes as needed through LFS/UFS. Ice production
begins 4 to 6 minutes after Comp and FM start depending on ambient and water
conditions. Diagnosis: Check that Comp and FM energize. If not, check for 115VAC at
CB X2 relay #4 (BR) to neutral (W) and CB X2 relay #3 (BK) to neutral (W). If 115VAC is
present at CB X2 relay #4 (BR) and not at CB X2 relay #3 (BK), replace CB. If 115VAC
is present at CB X2 relay #3 (BK) and Comp and FM do not energize, for Comp check
Comp winding, start capacitor, and start relay. For FM, check FM windings and fan
blade for binding.
7) Refill/Low-Water Safety Cycle–As ice is produced, water level in the reservoir drops.
UFS opens, nothing happens at this time. LFS opens and refill begins. X11 relay
de-energizes, low-water safety circuit opens (X11 relay #4 (DBU) and #6 (BR), and CB
#3 (BR) and #4 (DBU)), CB 90 sec. low-water safety timer starts. WV energizes. Comp,
FM, GM, and X12 relay continue. UFS must close before 90 sec. low-water safety
timer terminates. Otherwise, shutdown cycle is initiated. Once UFS closes, X11 relay
energizes, WV de-energizes, and low water safety circuit closes, terminating 90 sec.
low-water safety timer.
Diagnosis – Check that WV energizes. If not, confirm LFS status (open), X11 relay
de-energized. If not, see step 5 above.
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