Scotsman SLC400 User Manual page 20

SLC400
Service Diagnosis:
SYMPTOM
No ice compressor is operating
Ice is made, but not harvested.
POSSIBLE CAUSE
No cooling due to low refrigerant
charge
Ice size thermostat contacts do
not switch position
Ice will not slide down ice rack
due to minerals on rack.
Ice will not slide down ice rack
due to ice rack out of position
Ice will not slide down ice rack
due to bent ice rack
Lack of heat during harvest cycle
due to unit in air temp. less than
0
55 F.
Lack of heat during harvest due to
water flowing thru water cooled
condenser
Lack of heat during harvest due to
lack of refrigerant
Lack of heat during harvest due to
hot gas valve not opening fully.
Ice does not slide down face of
evaporator due to minerals on
evaporator surface
Harvest cycle too short due to
harvest termination thermostat
opens at too low a temperature.
January 1993
Page 20
PROBABLE FIX
Locate leak, recover remaining
refrigerant, replace dryer,
evacuate and weigh in nameplate
charge.
Ice not made near thermostat
probe due to water distributor
holes restricted. Clean water
distributor pan.
Thermostat defective, replace it
Clean machine with ice machine
cleaner.
Reposition ice rack
Replace ice rack
Warm up air or move machine.
Replace water regulating valve
Check low side pressure during
harvest. If low either the charge is
low or the hot gas valve does not
open fully. If charge is the
problem, locate leak, recover
remaining refrigerant, repair leak,
replace drier, evacuate and weigh
in nameplate charge.
Check low side pressure during
harvest. If low either the charge is
low or the hot gas valve does not
open fully.
Clean water system with ice
machine cleaner
Replace harvest termination
thermostat