Evaporator Is Frozen Up - Hoshizaki KM-61BAH Service Manual

3. EVAPORATOR IS FROZEN UP

PROBLEM
[1] Freeze cycle a) Float Switch
time is too
long.
b) Inlet Water Valve
c) Control Board
[2] All ice formed a) Evaporator
on Evaporator
b) Water Supply Line 1. Water pressure too low.
does not fall
into bin in
c) Inlet Water Valve
harvest cycle.
d) Ambient and/or
e) Thermistor
f) Control Board
[3] Others a) Spray Tubes
b) Water System
c) Refrigerant
d) Expansion Valve
e) Hot Gas Solenoid
f) Water Supply Line
g) Water Filter
POSSIBLE CAUSE
1. Leads shorted or
2. Float does not move
1. Diaphragm does not
1. Defective.
1. Scaled up.
1. Dirty mesh filter or
2. Diaphragm does not
1. Too cool.
water temperature
1. Out of position or loose
1. Harvest Timer is set too
2. Defective.
1. Clogged.
2. Out of position.
1. Dirty.
1. Undercharged.
1. Bulb out of position or
(KM-151 only)
2. Defective.
1. Coil winding opened.
Valve
2. Plunger does not move.
3. Wiring to Hot Gas
1. Too small; requires 3/8"
1. Flow rate too small.
defective switch.
freely.
close.
orifice.
close.
attachment.
short.
loose attachment.
Valve.
OD line dedicated per
machine.
38
REMEDY
1. Check and replace.
2. Clean or replace.
1. Check for water leaks
with icemaker off.
Replace if necessary.
1. See "II. 3. [d] CONTROL
BOARD CHECK
PROCEDURE".
1. Clean.
1. Check and get
recommended pressure.
1. Clean.
2. Check for water leaks
with icemaker off.
Replace if necessary.
1. Increase temperature.
1. See "VI. 16.
THERMISTOR".
1. Adjust longer, referring to
"II. 4. HARVEST
CONTROL -
THERMISTOR".
2. See "II. 3. [d] CONTROL
BOARD CHECK
PROCEDURE".
1. Clean.
2. Place in position.
1. Clean.
1. Check for leaks and
recharge.
1. Place in position.
2. Replace.
1. Replace.
2. Replace.
3. Check for loose
connection or open, and
replace.
1. Increase water supply line
size.
1. Replace with filter that
has larger flow rate.