Scotsman C2648 - Manual (Page 41)

C2648 Prodigy and Prodigy Plus Service Manual
January 2015
Page 41
Problem Likely Cause Probable Solution
Shut Down on Maximum Freeze
Time (continued)
Compressor not operating
(continued)
Check compressor temperature
Check compressor voltage
Check compressor windings
Low refrigerant charge Add some refrigerant and restart
unit. If cycle time improves, look for
leak.
Hot gas valve leaks through during
freeze
Check hot gas valve for hot outlet
during freeze
Thermostatic expansion valve bulb
loose
Check bulb
Thermostatic expansion valve
producing very low or very high
superheat
Check evaporator superheat,
change TXV if incorrect
Compressor inefficient Check compressor amp draw, if
low and all else is correct, change
compressor
Debris in refrigeration system Recover charge. Open quick
connects, check for loose or
missing foil. Open liquid line and
hot gas valves. Check for debris.
Replace drier, evacuate and weigh
in nameplate charge.
Shut down on maximum harvest
time
Ice bridge thickness too small, not
enough ice to open curtain
Check and adjust if needed
Ice bridge thickness too large, ice
frozen to evaporator frame
Check and adjust if needed
Purge valve does not open, water
melts ice bridge, not enough ice to
open curtain
Check purge valve
Incomplete ice formation Check water distributor for partially
plugged holes
Curtain out of position Check curtain for swing restriction
Diagnostics