Vogt TUBE-ICE 03TB Service Manual page 78

8-6
TROUBLESHOOTING
SYMPTOM: Low ice capacity.
POSSIBLE CAUSE
Low refrigerant charge.
Restriction in liquid line.
TXV overfeeding.
Thawing gas solenoid valve (18) leaking
through during the freeze cycle.
Water distributors at top of freezer may be
stopped up.
Inadequate water for ice making.
Make-up water float valve (12) stuck open,
adjusted too high, or water tank drain valve
(39) open or leaking
Controls for regulating freezing and thawing
cycles not adjusted properly.
Excessively high head pressure.
Warm make-up water for ice making.
Drain valve (39) open.
4/21/14
POSSIBLE REMEDY
Check for and repair leaks, and add
refrigerant.
Check for a partially closed valve or an
obstruction at the drier, strainer, solenoid
valve, or expansion valve. The liquid line will
normally have frost on the downstream side of
a restriction, especially as the suction pressure
decreases.
Check freezer superheat. Average superheat
should be between 8 - 10 deg F. Before
adjusting TXV, make sure all other potential
liquid overfeed causes have been checked.
Check TXV bulb for proper insulation and
contact on suction line. Make sure machine is
clean and there is proper water flow.
Check the manual opening stem to make sure
it is in the automatic position (stem screwed
out). Check for leakage through the valve by
sound and temperature difference. Close the
stop valve (90) at the receiver to confirm
suspicion of leakage. Repair or replace the
valve as needed.
Remove freezer cover
distributors. See Water Distributors, Section 7.
Check water pressure (30 PSIG minimum
recommended). Check for a restriction in the
water supply line or at the make-up water float
valve.
Repair, replace or adjust float valve, or close,
repair, or replace water tank drain valve.
For highest capacity, cylinder ice should have
a small hole and crushed ice should be about
3/16" thick. Check the freezer pressure switch
and thaw timer for proper adjustment, Section
9.
Check water regulating valve or fan control
adjustment. Check to make sure the WC or
AC condenser is clean. Check refrigerant
tables for pressure/temperature relation.
Capacity of the machine is proportional to ice
making water temperature.
will reduce the ice making capacity.
Section 10, Capacity Table.
Close drain valve (39).
03TA Service Manual
and clean the
Warmer water
See