Abnormal Ice - Hoshizaki KM-1900SAH Service Manual

Problem
[1] Freeze cycle time is
long. (continued)
[2] Harvest cycle time is
long.

4. Abnormal Ice

Problem
[1] Small cubes.
Possible Cause
m)Headmaster (C.P.R.)
(remote condenser
unit)
n) Control Board
a) Water Supply
b) Thermistor
c) Control Board
d) Inlet Water Valve
e) Evaporator
f) Hot Gas Valve
g) Expansion Valve
h) Water Regulating Valve
(water-cooled models)
i) Liquid Line Valve (if
applicable)
Possible Cause
a) Pump Out Check Valve 1. Dirty or worn and
b) Ice Cube Guide
c) Water System
d) Inlet Water Valve
e) Pump Motor
f) Control Board
1. Bypassing.
1. Float switch
connection loose (K5).
2. Defective.
1. Water temperature too
cold.
1. Out of position or
defective.
1. Not reading
thermistor.
2. Sending voltage to
liquid line valve (if
applicable) in harvest.
1. Clogged.
1. Scaled up.
1. Does not open, or
opens partially.
1. Wide open in harvest. 1. Check and replace.
1. Open during harvest.
1. Open during harvest
cycle.
leaking by.
1. Out of position.
Circulated water falls
into bin.
1. Water supply line too
small; requires 1/2"
OD line dedicated per
machine.
2. Water filter clogged or
flow rate too small.
1. Dirty mesh filter or
orifice.
1. RPM too slow.
1. Defective.
51
Remedy
1. Replace.
1. Check and reconnect.
2. Replace. See "II.C.4.
Control Board Check
Procedure."
1. Increase temperature.
1. Reattatch and secure.
See "II.D. Harvest Control
- Thermistor."
1. Check and replace.
2. Check and replace. See
"II.C.4. Control Board
Check Procedure."
1. Clean or replace.
1. Clean.
1. Check and replace.
1. Adjust or replace. See
"V.J. Adjustment of Water
Regulating Valve ."
1. Check and replace.
Remedy
1. Clean or replace.
1. Place in position.
1. Increase water line size.
2. Replace filter or install a
higher flow rate filter.
1. Clean.
1. See chart 1.[5].
1. See "II.C.4. Control Board
Check Procedure."