Service manual

45 TD 204
DIAGNOSIS
Starving TXV - Product Symptoms
1. Suction pressure lower than normal for the operating
conditions.
2. Ice production lower than normal and/or none.
3. Ice pattern on evaporator (if any) thin at top and thick
at bottom.
Flooding TXV - Product Symptoms
1. Ice production lower than normal and/or none.
2. Suction pressure stabilizes at higher than normal pres-
sure for operating conditions. Suction pressure does
not modulate and may start to slowly rise.
3. Ice pattern will be very heavy at the bottom and thin at
the top of the evaporator. Product may not enter har-
vest cycle because of higher than normal suction line
temperature.
Important: Frost on the suction line may be normal on me-
dium temperature refrigeration equipment. Frost
should be considered a red flag, long run times
will normally produce some type of frost pattern..
Before checking the sealed refrigeration system,
the external conditions that could lead to frost
follow:
1. Dirty condenser
2. Dirty condenser fan blade
3. Improper air clearance around Cuber
4. Loose TXV bulb mount
5. Poor water flow over evaporator
6. Ventilation problems
The expansion valves used on Cornelius “I” series ice equipment
have special super heat settings and bulb charge designed from the
product load and HP 62 refrigerant. Should the need arise to replace
this or any refrigerant components, be certain to use only compo-
nents recommended by Cornelius for the model of the Cuber being
serviced. Use of nonapproved components will compound system
difficulties and may void product warranty.