Low Ice Production - Hoshizaki KM-901MAH Service Manual

Problem
[2]All ice formed on
evaporator does not
fall into bin in harvest
cycle. (continued)
[3]Other.

3. Low Ice Production

Problem
[1] Freeze cycle time is
long.
Possible Cause
l) Refrigerant
m)Water Regulating Valve
(water-cooled model)
a) Ice Cube Guide
b) Thermostatic Bin
Control
c) Mechanical Bin Control 1. Movement restricted.
Possible Cause
a) Inlet Water Valve
b) Float Switch
c) Evaporator
d) Spray Tubes
e) Pump Motor
f) Condenser (except
water-cooled model)
g) Refrigerant Charge
h) Hot Gas Valve
i) Expansion Valve
j) Compressor
k) Condenser Water
(water-cooled model)
l) Liquid Line Valve
m)Headmaster (C.P.R.)
(remote condenser
unit)
1. Low charge.
1. Leaking by in harvest. 1. Check and replace.
1. Out of position.
1. Bulb out of position.
2. Bad contacts.
2. Defective.
1. Diaphragm does not
close.
1. Float switch does not
move freely or switch
defective.
1. Scaled up.
2. Damaged.
1. Dirty.
2. Out of position.
1. RPM too slow.
1. Air filter or condenser
clogged.
1. Low charge.
1. Open.
1. Bulb loose.
2. Operating erratically.
1. Erratic or off.
1. Water regulating valve
set too high.
2. Condenser water
pressure too low.
3. Water temperature out
of specification.
1. Erratic, sticking.
1. Bypassing.
65
Remedy
1. Check for leaks. Recover,
repair, evacuate, and
recharge.
1. Place in position.
1. Place in position.
2. Check for continuity and
replace. See "IV.C.1.
Thermostatic Bin Control
Check."
1. Check and free.
2. See "IV.C.2. Mechanical
Bin Control Check and
Cleaning."
Remedy
1. Check for water leaks with
icemaker off.
1. Clean or replace. See "IV.
D. Float Switch Check and
Cleaning."
1. Clean.
2. Replace.
1. Clean.
2. Place in position.
1. See chart 1.[5].
1. Clean.
1. Check for leaks. Recover,
repair, evacuate, and
recharge.
1. Check and replace.
1. Secure bulb.
2. Check and replace.
1. See chart 1.[3].
1. Adjust or replace. See
"V.J. Adjustment of Water
Regulating Valve."
2. Check and get
recommended pressure.
3. Correct to specification.
1. Check and replace.
1. Replace.