Scotsman SLC400 User Manual page 21

Service Diagnosis:
SYMPTOM
Ice is made, but will not harvest
Makes ice, but very little
Cubes are wrong size/shape
Ice fused together in bin
POSSIBLE CAUSE
Will not harvest due to hot gas
valve not opening.
Slow/incomplete harvest due to
hot gas valve not fully open.
High discharge pressure, due to
dirty condenser; faulty fan motor;
not enough water thru water
cooled condenser, high water
temperatures, water reg. valve set
too high.
Inlet water temperatures and
room ambient very high
Long freeze cycle due to hot gas
valve leaking thru.
Compressor inefficient
Ice size thermostat not adjusted
properly
Freeze cycle too short due to
heater open
Water system is restricted with
minerals
Ice thickness probe tube covered
with minerals
Not enough water
Too much superheat
Ice in bin too long
Too many minerals in water
November 1994
Page 21
SLC400
PROBABLE FIX
Check for voltage to coil in
harvest, if there is voltage
replace hot gas valve
Check low side pressure in
harvest, replace hot gas valve if
too low with correct ref. charge.
Check for causes of high
discharge pressure and correct.
Advise user, suggest additional
room cooling.
Check temperature of tubes to
and from hot gas valve; there
should be a temperature drop
across the valve in the freeze
cycle. Replace valve if temps are
nearly equal.
Check/replace compressor
Adjust ice size thermostat; use
gauge shipped with machine
Check/replace heater on ice size
thermostat probe tube.
Clean water system with
Scotsman Ice Machine Cleaner
Clean tube with ice machine
cleaner
Check water supply pressure
Check water supply for restrictions
Check superheat, replace TXV if
too high.
Check hot gas valve for leak-thru;
replace if leaks thru.
Advise user to pour water on ice
to ease removal
Suggest water treatment to user.