Hoshizaki KM-300BAJ, Руководство по обслуживанию

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2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up check
list.
See the Hoshizaki America Technician’s Pocket Guide or contact your local distributor
for a copy of the freeze-up checklist.
PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle
time is too
long.
a) Float Switch 1. Leads shorted or defective
switch.
1. Check and replace.
2. Float does not move freely. 2. Clean or replace.
b) Inlet Water Valve 1. Diaphragm does not close. 1. Check for water leaks
with icemaker off.
Replace if necessary.
c) Control Board 1. Defective. 1. See “II.C. Control Board
Check”.
[2] All ice formed
on Evaporator
does not fall
into bin in
harvest cycle.
a) Evaporator 1. Scaled up. 1. Clean.
b) Water Supply Line 1. Water pressure too low. 1. Check and get
recommended pressure.
c) Inlet Water Valve 1. Dirty mesh filter or orifice. 1. Clean.
2. Diaphragm does not close. 2. Check for water leaks
with icemaker off.
Replace if necessary.
d) Ambient and/or
water temperature
1. Too cool. 1. Increase temperature.
e) Thermistor 1. Out of position or loose
attachment.
1. See “II.F. Thermistor
Check”.
f) Control Board 1. Harvest timer is set too
short.
1. Adjust longer, referring to
“III.C.2 Harvest Timer”.
2. Defective. 2. See “II.C. Control Board
Check”.
[3] Others a) Spray Tubes 1. Clogged. 1. Clean.
2. Out of position. 2. Place in position.
b) Water System 1. Dirty. 1. Clean.
c) Refrigerant 1. Undercharged. 1. Check for leaks and
recharge.
d) Expansion Valve 1. Bulb out of position or loose
attachment.
1. Place in position.
2. Defective. 2. Replace.
e) Hot Gas Solenoid
Valve
1. Coil winding open. 1. Replace.
2. Plunger does not move. 2. Replace.
3. Wiring to hot gas valve. 3. Check for loose
connection or open, and
replace.
f) Water Supply Line 1. Too small; requires minimum
1/4" nominal ID copper water
tubing or equivalent line
dedicated per machine.
1. Increase water supply
line size.
g) Water Filter 1. Flow rate too small. 1. Replace with filter that
has larger flow rate.